Page 39 - CITS - Welder - Trade Theory

WELDER - CITS

Types of weld joint

Objectives: At the end of this lesson you shall be able to
• explain the basic welding joints
• explain of butt and fillet welds.

Introduction
Joints are prepared to weld metals at less cost. Joint obtain the required strength, lode and pressure. Weld can
very easy, less time of weld, save the filler metal. Control the internal stresses.
Types of welding joint
1 Butt joint
2 T-joint
3 Lap joint

4 Corner joint
5 Edge joint

Fig 1

1 Butt joint: Joint two members that meet at thin edge on the Same plane used in application where a Smooth
weld face is required. Filler groove welded groove welding requires added expertise and expense.
Improper design welding risk distortion and residual Stresses
2 T-joint :-Joint two member that meet at a shaped angle good Mechanical properties, especially when welded
from both side. Easily welded with little or no joint preparation. Usually fillet welded, although j-grooves are
possible.
3 Lap Joint : Joint two member Raving overlapping surfaces. Good mechanical properties especially when
welded from both sides. Usually fillet wedded thicker material required, more, over lap.
4 Corner joint: Joint two member that meet at an angle. Two main types open corner and closed corner. Easily
welded with tittle or no joint preparation. Increase travels speed on light gauge material to avoid burn through.
5 Edge joint: Joint two parallel member. , or, nearly parallel, not recommended if either member will be Subject
impact on high stresses. Square groove is most common. But other groove conformation is possible. Very
deep penetration is impossible.

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CITS : C G & M - Welder - Lesson 6&7 CITS : C G & M - Welder - Lesson 6&7