1. DESIGN
DESIGN OF
WELDED
WELDED
COMPONENTS
COMPONENTS

2. Quality control of welded joints
There are five welding process regularly employed namely:
1 Shielded Metal Arc Welding (SMAW)
An arc is established between the electrode and work piece
Gaseous sheild is provided by the vapourisation of the flux

3. Types welding techniques
2 Submerged-Arc Welding (SAW)
SAW involves formation of an arc between a continuously-fed bare wire electrode and the work piece.
Prior to welding, a thin layer of flux powder is placed on the work piece surface.
The arc moves along the joint line and as it does so, excess flux is recycled via a hopper. There is no visible arc light, welding is spatter-free and there is no need for fume extraction.
Submerged Arc Welding

4. Types of welding techniques
3 . Manual Metal-Arc welding (MMA)
When an arc is struck between the metal rod (electrode) and the workpiece, both the rod and workpiece surface melt to form a weld pool. Simultaneous melting of the flux coating on the rod will form gas and slag which protects the weld pool from the surrounding atmosphere. The slag will solidify and cool and must be chipped off the weld bead once the weld run is complete

5. Metal active gas Welding Metal inert gas Welding
Types of welding techniques
4. Metal-Active Gas welding (MAG)
Metal active gas Welding
Metal inert gas Welding

6. Shop welding Field welding
Stud Welding
Shop welding Field welding

7. Structural Aspect of welding

8. Weld Definitions
Terminology used to describe the various parts of the weld -

9. Weld Types Types of Butt Joint Welds Types of Lap Joint Welds
Square Groove ButtJoint
Single-Vee Groove Butt Joint with Root Face
Types of Butt Joint Welds
Single- Vee Groove Butt Joint without Root Face
Double- Vee Groove Butt Joint
Single-U Groove Butt Joint
Types of Lap Joint Welds
Double Fillet Welded Lap Joint
Double Fillet Welded Joggle Lap Joint
Continuous Through-Welded Lap Joint Joining Adjacent Sheet Edges to Backing Structure
Continuous Through-Welded Lap Joint Attaching a Single Sheet To Backing Structure
Continuous Through- Welded Lap Joint

10. Weld Types… Types of Corner Joint Welds Double-Vee, Groove Weld
Horizontal Fillet Weld
Double-Vee, Groove Weld
Single Vee Groove Corner Joint
Square Groove Corner Joint
Types of Corner Joint Welds
Corner Fillet Joint
J Groove Corner Joint (Single or Double J)

11. Full welds and tack welds
Crevices and Corrosion & Mechanical design aspect
Full welds and tack welds

12. Types of stresses in welds

14. CASE STUDIES
Consider direction of Loading when sizing Fillet welds

15. Failure plane of fillet welds

16. Welding Procedures

17. Welding procedures

18. Weld types

19. Defects in Welding

20. Commonly encountered weld defects
IS:800 Draft

21. Geometric Shape Imperfections
Excess weld metal
Undercut
Linear misalignment
Overlap

22. Shape Imperfections . . Fillet welded joints Oversize fillet weld
Excess convexity
Asymmetric fillet weld
Undersized fillet weld
Poor fit-up

23. Lap joints welded with fillet welds
Effect of Weld Penetration on Stress Concentration in 1-1/2 in. Fillet Welds

24. Fatigue of Weldments
Effects of joint classification on fatigue life

25. Welded Lap Joints

26. Thank You