Lesson 1.1

Lesson 1.1Lesson 1.1

Welding TerminologiesWelding Terminologies

Base metalBase metalBase metal = Metal of workpieces or weldment

Which characteristics need to know ?

1) Mechanical Strength

Ductibility

Resilence

2) Chemical compositions Ferrous Non ferrous

Low alliage Alliage

3) Weldability How easy the metal can be welded

Which process is suitable

Which quality we can expect

What need to be cared for welds quality satisfactory

Filler metalFiller metalFiller metal = additional Metal comprising welds

Filler metal

Electrode

Rod

Wire

Insert filler

Welding FluxWelding FluxFlux = Chemical materials applied during welding

Welding flux

Coated

Core

Powder / grain

Paste

Coated electrode

Tubular electrode / wire

SAW flux

Gas welding / Brazing

Flux Requrements

• It remains stable and does not change to a vapor rapidly within the temperature range of the welding procedure.

• It dissolves all oxides and removes them from the joint surfaces.

• It adheres to the metal surfaces while they are being heated and does not ball up or blow away.

• It does not cause a glare that makes it difficult to see the progress of welding or brazing.

• It is easy to remove after the joint is welded.

• It is available in an easily applied form.

Welding JointWelding JointDistinguish : Joints Welds

Welding Joints

Butt joints

Corner Joints

Lap joints

Edge Joints

Tee Joints

Part of JointPart of JointPart of Joint

Root

Groove

Root gap

Root edge

Groove face

Bevel / groove angle

Groove radius

Root/joint penetration

Root – Bevel / GrooveRoot – Bevel / GroovePart of Joint

Root

Groove

Root gap

Root edge

Groove face

Bevel / groove angle

Groove radius

Root/joint penetration

Bevel / Groove FaceBevel / Groove FacePart of Joint

Root

Groove

Root gap

Root edge

Groove face

Bevel / groove angle

Groove radius

Root/joint penetration

Gap , edge , radiusGap , edge , radiusPart of Joint

Root

Groove

Root gap

Root edge

Groove face

Bevel / groove angle

Groove radius

Root/joint penetration

Gap , edge , radiusGap , edge , radiusPart of Joint

Root

Groove

Root gap

Root edge

Groove face

Bevel / groove angle

Groove radius

Root/joint penetration

Types of WeldsTypes of WeldsTypes of welds

String bead

Groove weld

Surface weld

Plug & slot weld

Fillet weld

Types of WeldsTypes of WeldsTypes of welds

String bead

Groove weld

Surface weld

Plug & slot weld

Fillet weld

Types of WeldsTypes of WeldsTypes of welds

String bead

Groove weld

Surface weld

Plug & slot weld

Fillet weld

Types of WeldsTypes of WeldsTypes of welds

String bead

Groove weld

Surface weld

Plug & slot weld

Fillet weld

Types of WeldsTypes of WeldsTypes of welds

String bead

Groove weld

Surface weld

Plug & slot weld

Fillet weld

Parts of WeldsParts of Welds

Welds DimensionWelds Dimension