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Technical KnowledgePublished PapersThe future of fracture
assessmentLow Power Laser Surfi-SculptWet welding repairs (May
2006)Moving contact arc welding (March 1998)Fabricating LNG
carriers (September 2006)Friction stir welding of aluminium
alloysDevelopments in A-TIG welding (March 1998)Welding aluminium
by laser (November 1996)Welding of titanium alloy risers (May
2000)Fatigue Life Prediction in Welded StructuresValidation of CIVA
software (September 2005)The early days of laser cutting (August
2007)Advanced hybrid joining technology (June 2009)Sound field
modelling using SimulUS (May 2008)The new age of pipeline
inspection (July 2007)Avoiding PWHT - Can it be justified? (May
2005)Friction stir welding developments (April 2002)Performance of
weldments in advanced 9%Cr steelLaser welding for plastic
components (May 2002)Viewpoint - Value and Quality [robotic
welding]Advanced joining techniques for the 21st centuryDigital
Radiography - Is It for You? (July 2004)Mechanical testing of
plastics welds (Sept 2002)Welding fume - Do you know your WEL?
(July 2006)Welding technologies for polymers and
compositesTransmission laser welding of plastics (May 2002)TWI:
Corrosion, welds and pipelines. (March 1999)A review of plastic
welding processes (March 2005)Advances in rail inspection
technology (June 2005)Material selection for supercritical CO2
transportModelling of adhesively bonded joints (April
2001)Resistance welding - state of the art (March
2003)Computerising your welding information (April 2001)Reliable
technical failure investigation (May 2005)Bonding plastics? Stuck
for a solution? (April 2006)BS 7910: History and future
developmentsCOMELD - An innovation in composite to metal
joiningCreating a stir in the rail industryEvaluation of CrackFirst
fatigue sensorsFriction stir welding of aluminium ships (June
2007)Hybrid joining - the best of both worlds (Sept 2002)Laser
welding of thermoplastic materials (June 2001)Predicting adhesive
joint life-times (February 2002)Recent Developments in Welding
Technology (May 2006)The Medical Devices Faraday
PartnershipAdhesive joining of metallic materials (October
1999)R-Curve Modelling with Constraint Effect? (July 2009)Welded
aerospace structures pass the testFriction stir welding of
magnesium alloys (March 2003)Friction welding of aero engine
componentsShielding gases for arc welding and cutting (May
2001)Sustained load cracking in titanium alloys (July
2003)Validating the integrity for re-use of a land pipelineA
competitive advantage through innovation (March
2001)European-sponsored NDT Research at TWI LtdModelling the
radiography of thick-section welds (1999)Review of rail axle
inspection methods (September 2003)Tandem MIG welding for improved
productivity (May 2001)Industrial lasers and applications in
automotive weldingInnovation in Materials Joining Technologies
(July 2006)Laser welding automotive steel and aluminiumStructural
integrity methods, where next? (October 2002)Fatigue design rules
for welded structures (January 2000)Friction stir welding - tool
developments (February 2001)Friction Stir Welding in Series
Production (October 2004)The SINTAP fracture toughness estimation
procedure (2000)Welding engineering knowledge on the Internet (July
2001)Foresight - Future trends in materials joining (June
2001)Resistance spot welding of high strength steels (May
2003)Emerging technologies for ceramic joining. (September
1998)Friction based welding technology for aluminium (July
2002)Friction stir welding of steel - a feasibility study
(1999)J-fracture toughness of polymers at slow speed (March
2001)Modelling guided waves in complex structures - Part 1:
RailPressure vessel corrosion damage assessment (November 2005)Some
developments in the joining of light alloys (Nov.2001)Transition
joints between dissimilar materials (April 2006)TWI: Corrosion,
welds and pipelines - An update (July 2000)Dual-rotation Stir
Welding - Preliminary trials (April 2004)Friction stir welding of
titanium alloys - A progress updateHybrid laser/GMA welding of new
land pipelines (August 2003)Advanced joining processes for repair
in nuclear power plantsGlob top materials to chip on board
componentsHydroprocessing reactor integrity: The basics (November
2004)The application of ultrasound to refine weld metal
structuresThe potential of high power lasers in nuclear
decommissioningThe use of power beams in surface modification
(January 2007)Adaptively Controlled High Brightness Laser-Arc
Hybrid WeldingCanister sealing for high level waste encapsulation
(May 2001)Four decades of electron beam development at TWI (August
2006)Novel Techniques for Corner Joints Using Friction Stir
WeldingThe feasibility of friction stir welding steel (February
1999)Weld modeling of thin structures with VFT software (July
2004)A review of the concept of mildly sour environments (June
1998)Environmental Lining Systems - Raising the Standards (May
2001)Novel technologies for repair and refurbishment (November
2006)Rotary friction welding of an Fe3Al based ODS alloy (July
2000)Sustained load cracking of titanium alloy weldments (June
2005)Taking fabrication management into the 21st century (June
2006)The laser alternative....to nuclear decommissioningThe
weldability of vanadium-microalloyed steels (November 2000)Advances
in welded creep resistant 9-12%Cr steels (October 2007)Fatigue life
prediction for toe ground welded joints (July 2009)Material
selection requirements for civil structures (July
2003)Demonstration of in-situ weld repair to a FPSO hull (August
2004)Developments in fusion welding of stainless steels (January
1994)Optimisation of resources for managing competing risks (May
2009)The reliability of radiography of thick section welds (July
1999)Welding and testing of thermoplastics tanks and pipes (June
2006)Corrosion of welded components in marine environments (April
2003)In the beginning ... [the history of laser cutting] (October
2002)In-line reciprocating friction stir welding of plastics (May
2007)Innovation and the Medical Devices Faraday Partnership (June
2005)Laser diode based vision system for viewing arc welding (May
2009)The effect of low H2S concentrations on welded steels (March
2000)ADIMEW Test: Assessment of a cracked dissimilar metal weld
assemblyFriction stir welding - process variants - an update
(October 2007)Laser welding of low-porosity aerospace aluminium
alloyRecent trends in the implementation of EN 729 (ISO 3834) - May
2001Reliability of manually applied phased array inspection (June
2009)Risk based optimisation of inspection planning in ships (June
2010)Silsesquioxanes - Tailored multifunctional oligomers (October
2007)The importance of welding quality in ship construction (March
2009)The phased array inspection of friction stir welded aluminium
plantValidation of arc welding equipment - revision of BS7570 (May
2001)Virtual fabrication technology (VFT) and shipbuildingBringing
aerospace welding specifications up to standardEB welding of large
components without a vacuum chamber (April 2007)Fatigue performance
of riser girth welds for deep-water applicationsFriction welding of
near net shape preforms in Ti-6Al-4V (June 2007)Management
processes for innovation in joining technology
(Nov.2001)Manufacturing with Lasers Developments and Opportunities
(July 2004)Moving weld management from the desk to the desktop
(September 1999)Process monitoring methods in laser welding of
plastics (April 2006)Production of titanium deposits by Cold Gas
Dynamic Spray (May 2005)Testing of superduplex stainless steel for
sour service (March 2003)Trends in the design and fabrication of
rolling stockWelding of Ti-6Al-4V with fibre delivered laser beams
(October 2007)A review of adhesive bonding techniques for joining
medical materialsA review of ball grid arrays for electronic
assemblyIndustry survey of risk-based life management practices
(August 2002)Laser welding of plastics - process selection software
(October 2003)Modelling of time reversal focussing in straight
pipes (October 2007)Radiography of thin-section welds, part 2:
modelling (September 2002)TELETEST (R) Guided wave technology -
case histories (September 2001)Ultrasonic phased array inspection
of FSW lap joints (September 2004)Aero engine improvements through
linear friction weldingCorrosion fatigue behaviour of welded risers
and pipelines (June 2007)Development of a fatigue sensor for welded
steel structures (May 2006)Development of HVOF sprayed aluminium
alloy engine bearings (May 2003)Developments in the use of
adhesives in industrial applications (2005)Materials processing
with a 10kW Nd:YAG laser facility (November 1999)NOMAD - Autonomous
manufacture of large steel fabrications (June 2002)Operational
Excellence through an asset management optimisation systemPlume
attenuation under high power Nd:YAG laser welding (October
2002)Trials using the Instrumented Indentation Technique (IIT)
(March 2005)Welding new stainless steels for the oil and gas
industry (March 2000)Development of corrosion resistant coatings by
HVOF spraying (May 2000)Digital radiography for the inspection of
small defects (February 2006)Evaluation of weld metal strength
mismatch in X100 pipeline girth weldsFracture toughness estimation
for pipeline girth welds (September 2002)Friction based
technologies for joining and processing (September 2001)Reduced
pressure electron beam welding in the power generation
industryWelding and joining techniques for polymeric medical
devicesA review of postweld heat treatment code exemption - Part 1
(March 2006)Development of the Trivex(TM) friction stir welding
tool (February 2003)Hydrogen cracking - its causes, costs and
future occurrence (March 1999)Performance Improvement through an
Asset Maintenance Optimisation SystemHeat insulation and fire
resistance using composite materials (June 1999)Modelling of Guided
Ultrasonic Waves in Aircraft Wiring (September 2008) Overview of
the European Fitnet fitness-for-service procedure (June
2008)Reliability of inspection for root flaws in riser girth welds
(June 2004)Techniques for welding polymeric devices using laser
sources (April 2003)Yb Fibre Laser/MAG Hybrid Processing for
Welding of Pipelines (July 2005)Advanced welding processes for
fusion reactor fabrication (September 1999)Corrosion fatigue of
steel catenary risers in sweet production (June 2008)Enhancements
to power beam welding processes for land transport (May
2004)Fracture mechanics assessment of flaws in pipeline girth welds
(June 2006)Friction stir welding conquers austenitic stainless
steels (November 2000)Laser-vapour interaction in high-power cw CO2
laser welding (October 2003)National and international
qualifications for welding personnel (May 2005)Novel joining and
sealing processes for solid oxide fuel cells (July 2002)Use of
infrared dyes for transmission laser welding of plastics (May
2000)Application of extreme value analysis to corrosion mapping
data (June 2009)Inspection reliability and periodicity for rail
axle inspection (June 2006)Joining polyethersulphone to aluminium
by ultrasonic welding (January 1999)Laser welding of aluminium
alloys using different laser sources (June 1998)Magnesium joining -
process developments and future requirements (May 2001)Nd:YAG laser
welding of titanium alloys using a directed gas jet (May 2010)New
Advances in Plastics Joining for High Speed Production (September
2001)Re-evaluation of fatigue curves for flush ground girth welds
(October 2008)The fibre laser - a newcomer for material welding and
cutting (August 2005)The Generation Of Autogeneous Surface Features
Using A Low Power Laser BeamAssessment of flaw significance in a
pipeline weld - a case study (May 2000)Friction stir welding - how
to weld aluminium without melting it (May 2001) Friction stir
welding - invention, innovations and applications (March
2001)Steeling the competitive edge: is there a place for robots?The
development of lightweight self-piercing riveting equipment (March
2001)Training and Certification in Long Range Ultrasonic Testing
(September 2008)A general review of recent developments in
resistance welding (November 2002)Assessing toughness levels for
steels to determine the need for PWHT - Part 2Autogenous Nd:YAG
laser welding of 6mm thick dissimilar steels (October 2001)FPSO
Structural integrity - a TWI collection of case studies (September
2004)Friction stir weld integrity and its importance to the rolling
stock industryFriction stir welders provide prefabricated
components and panels (July 2004)Hybrid Nd:YAG laser/gas metal arc
welding for new land pipelines (March 2002)Laser-vapour interaction
in high-power cw Nd:YAG laser welding (October 2003)Long-range
ultrasonic testing (LRUT) of pipelines and piping (September
2004)Radiography of thin-section welds, part 4: Further modelling
(September 2004)Solid state joining of metals by linear friction
welding: A literature reviewActivating Flux - Improving the
Performance of the TIG Process (February 2000)Effects of plastic
strain on cleavage fracture predictions in steel
(Dec.2001)Evaluation of necessary delay before inspection for
hydrogen cracks (May 2001)Fibre lasers for surface removal of
contaimated concrete in the nuclear sectorFinite Element Residual
Stress Prediction After Pwht Of Branch-Pipe ConnectionRadiography
of Thin Section Welds, Part 1: Practical Approach (September
2002)The simultaneous use of two or more friction stir welding
tools (January 2005)Friction stir welding and related friction
process characteristics (April 1998)Friction Stir Welding for the
fabrication of aluminium rolling stock (May 2008)Laser and Hybrid
Laser MAG Welding of Thick Section C-Mn Steel (September
2005)Modelling of long range ultrasonic waves in complex structures
(September 2008)Nd:YAG Laser welding of a stiffened panel
demonstration component (August 2001)Plastics welding and adhesive
bonding - Innovative applications (November 2000)Resistance seam
and laser welding of large hybrid metal packagesSignal processing
for quality assurance in friction stir weldsThe significance of
softened HAZs in high strength structural steels (May 2003)Welding
supermartensitic stainless steels for corrosive service (November
2007)Achieving low-porosity laser welds in aerospace aluminium
alloyFriction stir welding: invention, innovations and
industrialisation (March 2002)Novel joining methods applicable to
textiles and smart garments (September 2005)Novel joining
techniques for repair in the power generation industry (June
2002)The special importance of personnel competence in welding
fabrication (May 2009)Adaptively controlled hybrid welding using a
high brightness laser (October 2010)Application of friction stir
welding in the shipbuilding industryCritical review of joining
processes for powder metallurgy parts (September 2008)Electron beam
welding of crack sensitive nickel super alloy MAR-M-002 (July
2006)Energy absorbing joints between fibre reinforced plastics and
metals (April 2006)Friction and forge welding processes for the
automotive industry (September 1999)Low-porosity laser welding of
12.7mm thickness aerospace aluminiumModelling of crashworthy welded
joints of aluminium railway carbodiesProgramme of mitigation for
in-service damage of FPSO hull structures (June 2001)Quality
requirements for an FPSO hull and marine piping fabrication (August
2004)Review of the effect of hydrogen gas on fatigue performance of
steels (June 2010)Yb-Fibre laser single sided tube cutting for
nuclear decommissioning applicationsCorrosion fatigue of simulated
C-mn steel HAZs in sour produced fluids (June 2008)FSW process
variants and mechanical properties (July 2004)Laser and hybrd
laser-MAG welding of steel structures for shipbuilding (June
2007)Overview of recent welding-related pipeline technology
advances at TWI (June 2008)Railway rolling stock manufacturers
implement friction stir welding (October 2002)Review of statistical
methods used in quantifying NDT reliabilitySpectroscopic studies of
plume/plasma in different gas environments (October 2001)The
resistance spot welding of high and ultra-high strength steels
(November 2004)Validation of fracture assessment procedures through
full-scale testing (May 2008)Validation of idealised Charpy impact
energy transition curve shape (October 2001)Detection of corrosion
in offshore risers using guided ultrasonic waves (June
2007)Hydrogen cracking of ferritic-austenitic stainless steel weld
metal (February 2000)Industrialisation of friction stir welding for
aerospace structuresPD 6493 becomes BS 7910; what's new in fracture
and fatigue assessment? (June 1999)Remote crack repair welding in
steels using high power Nd:YAG lasers (October
2000)Structure/property relationships in polyetheretherketone
vibration welds (May 1999)Surfi-Sculpt - Revolutionary surface
processing with an electron beam (August 2005)The influence of
vanadium-microalloying on the weldability of steels (October
2001)The use of bobbin tools for friction stir welding of aluminium
alloys (August 2009)Coatings for offshore applications by high
velocity wire flame spraying (April 2005)Comeld - A New approach to
damage control for composite to metal joints (April 2005)Laser
welding of ultra-high strength steels for automotive applications
(April 2008)Mechanical Properties of Friction Welds in High
Strength Titanium Alloys (June 1999)Which procedures for
fitness-for-service assessment: API 579 or BS 7910? (July
2003)Analysis of crack arrest event in NESC-1 spinning cylinder
experiment (November 2002)Application studies using
through-transmission laser welding of polymers (April 2006)Eddy
current and thermography application for robotic aircraft
inspection (July 2002)Independent qualification of phased array
inspection of fillet welds (September 2002)Laser sealing of
plastics for medical devicesStatic and fatigue behaviour of spot
welded 5182-0 aluminium alloy sheet (March 1999)Adhesive shear
properties - development of a simplified test specimen (September
2002)An investigation into arc constriction by active fluxes for
TIG (A-TIG) welding (2000)Corrosion damage assessment and burst
test validation of 8in x 52 linepipe (July 2001)Corrosion fatigue
performance of welded risers for deepwater applications (March
2004)Heat affected zone microstructures in supermartensitic
stainless steels (October 2002)Influence of spraying parameters on
the properties of HVOF alumina coatings (May 2005)Significance of
liquation cracks in thick section welds in Al-Mg-Si plate (April
1998)Static shoulder friction stir welding of Ti-6Al-4V; process
and evaluation (June 2007)The application of finite element
modelling to guided wave testing systems (July 2002)The special
importance of personnel competence in welding fabricationA new
technique for girth welds in land pipelines: hybrid laser-arc
welding (June 2003)A novel polymeric coating for enhanced
ultrasound imaging of medical devicesCondition monitoring of large
structures using piezoelectric transducers (October 2007)Loading
rate effects on tensile properties and fracture toughness of steel
(April 1999)Review of fatigue assessment procedures for welded
aluminium structures (December 2003)Risk-based inspection and
maintenance - industry feedback and user needs (October 2002)A
review of K-solutions for through-thickness flaws in cylinders and
spheres (July 2007)Correlation of phased array inspection and
fatigue performance of FSW joints (June 2007)Design of pipelines
subject to lateral buckling to resist corrosion fatigue (March
2009)Friction stir welding - recent developments in tool and
process technologies (July 2003)Information technologies and their
influence on joining and constructionModelling and measurements for
the assessment of a full scale pipe bend test (July
2007)Radiography of thin section welds, Part 3: Additional Flaw
Measurements (September 2004)Recent developments & applications
in electron beam and friction technologies (May 2001)The prediction
of maximum HAZ hardness in C-Mn and low alloy steel arc welds (June
2008)A review of joining processes for packaging with plastics (May
1999 + Addendum July 2001)Advanced transducer development for Long
Range Ultrasonic inspection systemsApplication of friction stir
welding for the manufacture of aluminium ferries (May 2000)
Application of innovative welding methods to prefabricate aluminium
panels (October 2004)Constraint loss in welds due to geometry,
loading mode and strength mismatchCorrosion fatigue of welded
stainless steels for deepwater riser applications (June
2005)Development of Nd:Yag Laser-MAG hybrid welding of T joints for
shipbuildingDevelopment of the laser/MAG hybrid welding process for
land pipeline constructionHybrid Nd:YAG Laser-AC MIG welding of
thin section automotive aluminium alloy (June 2006)Hydrogen induced
stress cracking of duplex stainless steel subsea components (June
2010)Joining technology for high volume manufacturing of
lightweight vehicle structuresRecommended hot-spot stress design
S-N curves for fatigue assessment of FPSOs (June 2001)A review of
the effect of cold-work on resistance to sulphide stress cracking
(March 2007)A thermal method for surface crack detection in metals
with high lift-off (September 2004)Friction Stir Welding - Process
Variants and Recent Industrial Developments (October 2007)Long
range inspection of engineering assets using guided ultrasonic
waves (September 2008)Subsea dissimilar joints: Failure mechanisms
and opportunities for mitigation (March 2009)A novel polymeric
coating for enhanced ultrasound visibility of medical devicesAn
Introduction to Surfi-Sculpt Technology - New Opportunities, New
Challenges (April 2007)Assessment of Dissimilar Metal Interfaces
for Sub-Sea Application under Cathodic ProtectionComparison of the
ASME, BS and CEN fatigue design rules for pressure vessels (October
2003)Detection of fouling in food pipelines using Long Range
Ultrasonic Testing (September 2009)Experimental study and
prediction of fatigue crack growth in girth welded pipes (June
2002)Hybrid Nd:YAG laser-MAG welding of thick section steel with
adaptive control (October 2004)Integrity of FPSO [floating
production storage and offloading] hull structures (March
2000)Integrity of reduced pressure electron beam girth welds for
deep water pipelines (May 2004)Making the link - Effective joining
technology for aluminium in the 21st Century (May 2006)Novel method
of recording cooling curves during laser & laser/arc hybrid
welding (May 2003)Recent developments in friction stir welding of
thick section aluminium alloys (March 2007)The evolution of Yb
fibre laser/MAG hybrid processing for welding of pipelines (June
2005) Use of supermartensitic stainless steel pipe for offshore
flowline applications (June 2006)Development of thermal sprayed
plain bearings for automotive engine applications (July 2006)Ferric
chloride testing for weld procedure qualification of duplex
stainless steel weldmentsHydrogen embrittlement stress corrosion
cracking of superduplex stainless steel (March 2001)Investigation
of the A-TIG Mechanism and the Productivity Benefits in TIG Welding
(May 2009)Preferential weld corrosion: Effects of weldment
microstructure and composition (April 2005)The prediction of
maximum HAZ hardness in various regions of multiple pass welds
(June 2008)Long term monitoring of offshore installations using
ultrasonic guided waves (September 2008)Reliability analysis of
defect-containing structures using partial safety factors (June
2009)Structural integrity with Time of Flight Diffraction (TOFD)
ultrasonic inspection (July 2005)The potential for solid state
welding of titanium pipe in offshore industries (November
1997)Corrosion mitigation in biomass combustion plant using thermal
spray coatings (September 2009)Development of a permanent
installation tool for structural health monitoring (September
2008)Immersion Transmit-Receive Longitudinal phased array probe for
stainless steel (December 2008)Priority areas for welding, joining
and associated engineering research in Europe (April 2002)Progress
in friction stir welding of aluminium and steel for marine
applications (October 2003)Recent Developments in Welding
Inspection Certification (including developments in EWF and
IIW)Trends in welding processes in engineering construction for
infrastructure projectsComparison of long-term and short-term tests
for electrofusion joints in PE pipes (October 2006)Condition
monitoring of large oil and chemical storage tanks using guided
waves (September 2004)Environment assisted cracking assessment
methods: The behaviour of shallow cracks (October 2007)Interim
fatigue design recommendations for fillet welded joints under
complex loading (May 2001)Towards a simplified assessment procedure
for corroded nozzles in pressure vessels (August 1999)Development
of laser, and laser/arc hybrid welding for land pipeline
applications (February 2003)Friction Stir Welding - Process
variants and developments in the automotive industry (April
2006)Laser and hybrid laser-MIG welding of 6.35 and 12.7mm thick
aluminium aerospace alloyModelling guided waves in complex
structures - Part 2: Wire bundles - with and without insulationThe
corrosion behaviour of high velocity oxy-fuel (HVOF) sprayed
Ni-Cr-Si-B coatings (March 2002)Three-dimensional robotic
high-power Nd:YAG laser welding: Opportunities and obstacles (May
2001)Development and evaluation of CO2 laser-MAG hybrid welding for
DH36 shipbuilding steelFriction stir technology - recent
developments in process variants and applications (October 2006)New
developments in ultrasound phased array for the evaluation of
friction stir welds (March 2003)Sulphide stress cracking of welded
joints in weldable martensitic stainless steels (February 2001)A
new method of laser beam induced surface modification using the
Surfi-Sculpt process (April 2008)Compilation of stress intensity
factor and load limit solutions for the Fitnet procedure (May
2008)Emerging friction joining technology for stainless steel and
aluminium applications (February 1996)Extending the internal
examination intervals for pressure vessels using an RBI approach
(July 2009)HVOF sprayed WC-Co-Cr as a generic coating type for
replacement of hard chrome plating (March 2002)Microstructure &
properties of autogenous high-power Nd:YAG laser welds in C-Mn
steels (April 2002)Microstructure characteristics and corrosion
behaviour of HVOF sprayed metallic coatings (May 2001)Sour service
limits of dual-certified 316/316L austenitic stainless steel and
weldments (March 2010)Stress corrosion cracking of ferritic steel
weld metal - the effect of nickel. Part 1 (January 1982)Techniques
for improving the weldability of trip steel using resistance spot
welding (December 2005)Battle of the sources - using a high-power
Yb-fibre laser for welding steel and aluminium (July 2005)Battle of
the Sources - Using a high-power Yb-fibre laser for welding steel
and aluminium (June 2005)Effects of different gas environments on
CO2 and Nd:YAG laser welding process efficiencies (May 2002)Healthy
Aims - Development of Implantable Microsystems Medical
DevicesStress corrosion cracking of ferritic steel weld metal - the
effect of nickel. Part 2 (February 1982)The Potential of High Power
Lasers for Tube Cutting and Concrete Scabbling in Nuclear
DecommissioningCase studies on ECA-based flaw acceptance criteria
for pipe girth welds using BS 7910:2005 (June 2007)Probabilistic
remnant life assessment of corroding pipelines within a risk-based
framework (July 2002)Requirements for the European education of
railway track welders in aluminothermic welding (June
2006)Ultrasonic phased array inspection technology for the
evaluation of friction stir welds (January 2004)Welding of
structural steel components with high power, fibre delivered Nd:YAG
lasers (September 2003)Autonomous Manufacture of Large Steel
Fabrications EC Contract: G1RD-CT-2000-00461 'NOMAD' (March
2004)Comparison of methods for predicting the influence of residual
stresses on brittle fracture (July 2007)Pipeline Corrosion Control:
a historical perspective and a long range approach to the future
(May 2007)The effects of steel composition on the laser cut edge
quality of carbon and C-Mn steelsAgeing of adhesively bonded joints
- fracture and failure analysis using video imaging techniques
(2001)Improved corrosion performance of AZ91D magnesium alloy
coated with the Keronite process (February 2002)Investigation of
fatigue damage to welded joints under variable amplitude loading
spectra (January 2008)Laser surface modification of polymers to
enhance adhesion part II - PEEK, APC-2, LCP and PA (May 2000)
Process developments enabling more effective joining of medical
devicesThe evaluation of root defects in FSW by 'through-hole'
impact testing - preliminary studies (July 2005)Welds, their
quality and inspection capability for high integrity structures and
components (April 1999)A brief review of recent developments in
laser welding processes for ferritic pipe steelsAn exploratory
investigation of Nd:YAG laser welding in high pressure gaseous
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High quality and productivity joining processes and procedures for
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laser welding of 15mm thickness C-Mn steelsStress based design
guidelines for hydrogen induced stress cracking (HISC) avoidance in
duplex materials (May 2009)The Influence of Ti, Al and Nb on the
toughness and creep rupture strength of grade 92 steel weld metal
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through-thickness cracks (June 2008)Deformation pattern based
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boards (September 2006)Editorial by Steve J Maddox on friction stir
welded joints from a special issue of International Journal of
Fatigue, 2003External hardness limits for welds in cathodically
protected C-Mn steel pipelines carrying sour products (September
2000)Corrosion behavior of an HVOF-sprayed Fe3Al coating in a
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steels under cathodic protection (June 2004)Development of an
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assemblies containing BGAs (September 2006)Postweld heat treatment
to avoid intergranular stress corrosion cracking of
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creep crack growth properties of P91 parent and welded steel using
remaining failure strain criteria (June 2009)A Temperature
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of the welding performance of high-brightness lasers and a
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superaustenitic stainless steel weldmentsLocal approach predictions
of fracture toughness behaviour in real multi pass welds using
thermal simulation specimensA comparison of the gap bridging
capability of CO2 laser and hybrid CO2 laser MAG welding on 8mm
thickness C-MN steel plate (JulA new statistical local criterion
for cleavage fracture in steel. Part II - Application to an
offshore structural steelCalculation of stress intensity factors
corresponding to standard residual stress profiles for common weld
joint geometries (JulFracture assessment of through-wall and
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continuous wave solid-state lasers (Analysis of cross-correlation
and wavelet de-noising for the reduction of the effects of
dispersion in long-range ultrasonic tesResistance welding toolkit -
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enduranceAssessment of Flaws in Pipe Girth WeldsProgress Towards
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weldsEnvironment-Induced Cracking In Weld Joints In Subsea Oil And
Gas Systems Part IIFusion Zone Microstructure Associated With
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Composite Materials through 6 DOFs Robotic ManipulatorsCoping with
failed elements on an array: a modelling approach to the technical
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CompositesTop of Form. > Technical Knowledge > Published
Papers > Demonstration of in-situ weld repair to a FPSO hull
(August 2004) Share: Printer Friendly VersionDemonstration of
in-situ weld repair to a FPSO hullD J Abson and H G PisarskiPaper
presented at Proceedings of OMAE-FPSO 2004, OMAE Specialty
Symposium on FPSO Integrity, Houston, USA, 30 Aug - 2 Sept
2004.AbstractIf repair to the underside of an FPSO becomes
necessary, economic considerations require that, if at all
possible, repair be carried out with the FPSO remaining on station.
Any repair of defects in the bottom of an FPSO must therefore be
effected underwater. The preferred approach is to attach an
enclosed dam to the underside of the vessel, pump out the water and
then complete the repair from the inside. However, where the risk
of fire or explosion orballast considerations require, it may be
necessary to complete the welded repair from inside the vessel by
wet underwater welding.This paper describes how weld repairs can be
effected by the attachment of such a dam, and grinding, to simulate
the removal and welded repair of a through-wall fatigue crack by
wet underwater welding. The integrity and mechanical properties of
these welds are discussed.IntroductionIn view of the interruption
to supply that would accompany taking an FPSO off-station, and
moving it to a dry dock, a repair will normally be carried out with
the vessel on-station. For a repair to the bottom of an FPSO, the
preferred approach will generally be to attach an enclosed dam to
the underside of the vessel, drain it from inside, so that the
damaged region can be repaired in the dry, prior to removing the
dam. Where circumstances permit, the repair from the inside can be
effected by welding in air. However, for safety or ballast
considerations, it may be necessary to carry out the repair by
welding under water from inside the hull.This paper describes a
demonstration of single-sided repair, appropriate to a repair
following gouging and grinding to remove a through-wall crack in
the bottom of an FPSO. The repair welds were made both by welding
in air and bywet underwater welding. The paper also considers their
inspection and mechanical testing. Also included is a demonstration
of the attachment of an enclosed dam to the underside of a plate
that simulated the bottom of an FPSO. In this case, a butt weld was
deposited, simulating the repair of a gouged through-thickness
crack.Experimental approachParent SteelsThe 20mm thick steel plate
met the requirements of DNV 27S and LRS Grade D. This plate will be
referred to as 'ship plate' in this paper. Parallel to the rolling
direction, it had a yield strength of 293MPa and tensile strength
of458MPa. An additional 20mm thick plate, to ASTM A516 Grade I, was
also used. The chemical composition of these plates is given in
Table 1.
Table 1 Chemical analysis of the parent steels and backing
barsIdentityElement, wt%
CSiMnPSCrMoNiAlCuNbTiV
Ship plate DNV 27S0.150.210.960.0190.0060.018