WELD JOINT GEOMETRY AND WELDING TERMINOLOGY

WELD JOINT GEOMETRY AND WELDING TERMINOLOGY

A joint is the junction of numbers or edges of members which are to be joined or have been joined.

There are five basic types of joints :

a. Butt

b. Corner

c. T

d. Lap

e. Edge

Parts of the Weld Joint

Type of Welds

There are 18 basic types of welds utilized for arc welding :

Ñ Square – groove weld

Ñ Bevel – groove weld

Ñ V- groove weld

Ñ J - groove weld

Ñ U - groove weld

Ñ Flare-bevel- groove weld

Ñ Flare-V- groove weld

Ñ Fillet weld

Ñ Edge weld

Ñ Edge-flange weld

Ñ Corner-flange weld

Ñ Spot weld

Ñ Seam weld

Ñ Plug weld

Ñ Slot weld

Ñ Surfacing weld

Ñ Back weld

Ñ Backing weld

Single-welded joint is a fusion welded joint that is welded from one side only

Double-welded joint is a fusion welded joint that is welded from both side

Fillet weld is not type of joint. It is a particular type of weld which can be applied to a lap, T-, or corner joint.

Fillet weld is a weld of approximately triangular cross section joining two surface approximately at right angles to each other in a lap joint, T-joint, or corner joint.

Back weld

Ñ As a weld made at the back of a single groove weld

Ñ Applied after the front side has already been welded

Backing weld

Ñ As backing in the form of a weld

Ñ Deposited prior to the welding of front side