Welded Joints
Welding is a process of joining metallic parts by heating to a suitable temperature with or without application
Advantages of Welded Joints:
- It does not require an additional cover plate, gaskets, straps, or clip angle; thus, the welding assembly results in lightweight construction.
- Design of welded assemblies can be easily and economically modified.
- Welded joints are tight and leak-proof as compared to riveted joints and also their production time is less.
- Strength of weld metal is high, even higher than parent metal.
Disadvantages of Welded Joints:
- Vibration damping capacity of welded structure is very poor.
- It result in thermal-distortion of the parts, thus inducing residual stress.
- Quality and strength of the weld depends upon the skill of the welder.
Methods of Stress Relieving:
- Preheating of the weld area to retard cooling of the metal in the vicinity of the joint.
- Stress relieving of the weld area by using proper heat treatment, such as normalizing and annealing, in a temperature range of 550°C to 675°C.
- Shot peening by hammering the weld along the length when the joint is hot. It also increases the fatigue strength of the joint.
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