BASICSOF

WELDING

BASICS OF WELDING

•Types of Welds•Process of welding•Basic weld symbols •Representation of welds•Types of welds need to be used at skewed joint.

Welding is a process in which two pieces of metal are melted and fused together to from a joint. In structural welding this is accompanied by the addition of filler metal from a electrode.

Types of welding• Fillet weld • Groove weld

Fillet weldA weld of theoretically triangle C/S joining two surfaces. We have 3 types of jointsLap JointTEE JointCorner Joint

Minimum weld size required as per LRFD TABLE J2.4 of page 16.1-54

Maximum weld size

Groove weld

Few Groove Weld types • Square Groove• Bevel Groove • V Groove• J Groove• U Groove

Groove weld

Groove welds

Groove weld•Backing Bar

•Root opening

•Spacer bar

•Landing

Complete and partial joint penetration welds

Groove weldpre-qualified welded joints

Ref: LRFD table 8-3 page 8-33

Pre-qualified groove weldRef: LRFD table 8-3(cont.) page 8-35

Process of welding

• Shield metal arc welding (SMAW)• Submerged Arc Welding (SAW)• Gas Metal Arc Welding (GMAW)• Flux cored Arc Welding (FCAW)• Electro Slag Welding (ESW)• Electro Gas Welding (EGW)

Basic weld representation

Ref: 8-3(Cont) page 8-31of LRFD

Basic weld Symbols Ref: 8-3(Cont) page 8-31of LRFD

Basic weld Symbols Ref: 8-3(Cont) page 8-30of LRFD

Basic weld representation

Basic weld representation

Types of welds need to be used at skewed joint

• At the skewed joint we have to give the weld according to 10-13 (cont.) page 10-181 of LRFD Manual of Steel constructions

• It is varies depends on skew angle

• For < or = 11 degrees from perpendicular

• For 11< < or = 30 degrees from perpendicular

• For 30< < or = 45 degrees from perpendicular

• For = 45 degrees from perpendicular

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