Friction Stir Welding FINAL SEMNAR PPT

8/18/2019 Friction Stir Welding FINAL SEMNAR PPT

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ALL INDIA SHRI SHIVAJI MEMORIAL SOCIETY’S COLLEGE OF

ENGINEERING, PUNE

A

Seminar on

“FRICTION STIR WELDING”

GUIDED BY : Prof R!"#$%r! S T&'() PREPARED BY: RAJESH VADGAVE

S)!* No T+-+./.0

TE Pro%'1*#o$ S!$%2#1&

-+/3+4


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INTRODUCTION :

Friction stir welding (FSW) was invented at The Welding Institute (TWI) of UK in 1991 as a solid

state !oining techni"ue# and it was initiall$ a%%lied to aluminium allo$s&

The 'asic conce%t of FSW is remara'l$ sim%le& A nonconsuma'le rotating tool with a s%eciall$

designed %in and shoulder is inserted into the a'utting edges of sheets or %lates to 'e !oined and traversed along the

line of !oint&

Fig No. 01 Schematic drawing of friction stir welding


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PRINCIPLE OF OPERATION :

A constantl$ rotated non consuma'le c$lindricalshouldered tool with a %rofiled %ro'e is transversel$

fed at a constant rate into a 'utt !oint 'etween two clam%ed %ieces of 'utted material&

The %ro'e is slightl$ shorter than the weld de%th re"uired# with the tool shoulder riding ato% the wor

surface&

Fig No. 02 Schematic diagram of the FSW process: (A) Two discrete metal workpieces !tted together" alo#g with the tool (with a proe)


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MICROSTRUCTURAL FEATURES :

The stir one (also nugget# d$namicall$ recr$stallised one) is a region of heavil$ deformed material

that roughl$ corres%onds to the location of the %in during welding& The grains within the stir one are roughl$ e"uated

and often an order of magnitude smaller than the grains in the %arent material&

A uni"ue feature of the stir one is the common occurrence of several concentric rings which has 'een

referred to as an *onionring* structure& The %recise origin of these rings has not 'een firml$ esta'lished# although

variations in %article num'er densit$# grain sie and te+ture have all 'een suggested&

Fig ,o& -. The %rogress of the tool through the !oint# also showing the

weld one and the region affected '$ the tool shoulder&


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TOOL GEOMETRY :

Tool geometr$ is the most influential as%ect of %rocess develo%ment& The tool geometr$ %la$s a

critical role in material flow and in turn governs the traverse rate at which FSW can 'e conducted&&

An FSW tool consists of a shoulder and a %in as shown schematicall$ in Fig& As mentioned

earlier# the tool has two %rimar$ functions

Fig& -/& Schematic drawing of the FSW tool&


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The uniformit$ of microstructure and %ro%erties as well as %rocess loads are governed '$ the tool design&

0enerall$ a concave shoulder and threaded c$lindrical %ins are used&

Fig& -& WorlT2 and 23 TrifluteT2 tool

TOOL GEOMETRY :


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WELDING PARAMETERS :

The rotation of tool results in stirring and mi+ing of material around the rotating %in and the

translation of tool moves the stirred material from the front to the 'ac of the %in and finishes welding %rocess&

4owever# it should 'e noted that frictional cou%ling of tool surface with wor %iece is going to

govern the heating&

Fig& -5& 6oint configurations for friction stir welding7 (a) s"uare 'utt# (') edge 'utt# (c) T 'utt !oint# (d) la% !oint# (e) multi%le

la% !oint# (f) T la% !oint# and (g) fillet !oint&


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8esidual stress

4ardness

2echanical %ro%erties

orrosion 'ehaviour

2aterial s%ecific issues

o%%er allo$s

PROPERTIES :


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ADVANTAGES :

0ood mechanical %ro%erties in the aswelded condition

Im%roved safet$ due to the a'sence of to+ic fumes or the s%atter of molten material&

,o consuma'les : A threaded %in made of conventional tool steel&

;asil$ automated on sim%le milling machines : lower setu% costs and less training&

an o%erate in all %ositions (horiontal# vertical# etc&)# as there is no weld %ool&

0enerall$ good weld a%%earance and minimal thicness under


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DISADVANTAGES :

;+it hole left when tool is withdrawn&

=arge down forces re"uired with heav$dut$&

=ess fle+i'le than manual and arc %rocesses &

>ften slower traverse rate than some fusion welding techni"ues# although this ma$ 'e offset if fewer

welding %asses are re"uired&


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APPLICATIONS :

Aeros%ace

Shi%'uilding

Automotive

8ailwa$s

Fa'rication

8o'otics

?ersonal om%uters


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SUMMARY AND FUTURE OUTLOO5: :

In these review article current develo%ments in %rocess modelling# microstructure and %ro%erties# material

s%ecific issues# a%%lications of friction stir welding


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CONCLUSION :

In this Seminar learn a'out various as%ects of Friction Stir Welding lie Tool geometr$#

2icrostructure etc&

The 'asic conce%t of FSW is remara'l$ sim%le& A nonconsuma'le rotating tool with a s%eciall$

designed %in and shoulder is inserted into the a'utting edges of sheets or %lates to 'e !oined and traversed

along the line of !oint&

The %ractical nowledge a'out %rocess is ac"uired&


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REFERENCES :

8&S& 2ishra# @&& 2a# Friction stir welding and %rocessing# science direct 6ournal&

htt%s7


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Than ouCDDD

Friction Stir Welding FINAL SEMNAR PPT

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Friction Stir Welding FINAL SEMNAR PPT