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DESIGN DESIGN OF WELDED WELDED COMPONENTS COMPONENTS.

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Presentation on theme: "DESIGN DESIGN OF WELDED WELDED COMPONENTS COMPONENTS."— Presentation transcript:

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

13

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


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