Fatigue Strength Improvement of TIG Welded Joint by Shot Peening Process

Abstract:

Aluminium alloys are widely used in engineering fields because of its characteristics. Components used in the fields of automobile, aerospace such as gears, shafts, turbines. In the mechanical field materials can be joined using many processes like riveting, bolted joints or by using permanent joining techniques like welding, brazing or soldering. The welded joints are often used for structural applications due to the reason that they provide nearly the same strength of the parent material. But researches show that even though they provide good strength in tension, they fail much faster when they exposed to fatigue loading. This may be due to various reasons like improper welding sequence, improper preparation or improper welding parameters of the joint materials. The fatigue life may also get reduced due to stress concentration developed during the welding process. Fatigue failures often results in catastrophic failures. Many designs have been reported, have been occurred due to fatigue failures which resulted in heavy loss of human lifespan and goods. Materials with even higher tensile strength are found to fail at less number of cycles after welding.

• Periodical: Applied Mechanics and Materials (Volume 867)
• Pages: 81-87
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.867.81
• Online since: July 2017
• Authors: S. Arun Kumar*, M. Muralidharan, P. Ashoka Varthanan, C. Vigneshkumaran, A. Bala Kumaran, S. Nishanth
• Keywords: Compressive Residual Stress, Fatigue Strength, Plastic Deformation, Tensile Strength

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