International Journal of Engineering Research

A. Prashanth ¹, K. Elangovan ², S. A. Rodriguez Arthurs ²

Affiliations
1 Mechanical Engineering, CiTech, Bangalore, IN
2 CiTech, Bangalore, IN

Abstract

Stresses are the prime source for the fatigue life diminution. In order to increase the fatigue life of the welded module, the residual stresses has to be minimized and this can be primed by choosing appropriate material in fabrication of the part and by adopting suitable welding process. There is another possibility to reduce the induced residual stress and thereby increasing the component life under fatigue loading, is by the application of post weld treatments. In the class of mechanical post weld treatments, Ultrasonic Impact Treatment is relatively new post weld treatment method. Ultrasonic Impact Treatment (UIT) imparts the energy generated from high frequency impulses into treated surface through specially designed strikers leading to the plastic deformation of surface layers. The technique is also recommended due to its high process stability and low operating costs. Modest initial loads are used in UIT to produce deep penetration work hardening of minor surface roughness. This technique accordingly opens up applications that are impossible to achieve using conventional work hardening technique.

Keywords

Ultrasonic Impact Treatment (UIT), Welding, Fatigue, Residual Stress.

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