An investigation on residual stress and fatigue life assessment of T-shape welded joints

This paper aims to quantitatively evaluate the residual stress and fatigue life of T-type welded joints with a multi-pass weld in different direction. The main research objectives of the experi-mental test were to test the residual stress by changing direction along with multiple wielding passes and determine the fatigue life of the welded joints. The result shows that compressive residual stress increases in the sample gradually from single-pass weld to double and triple-pass weld. Moreover, the fatigue life of the specimen also gradually improves with an increasing number of welding passes. Performing multi-pass welding in different directions affects the ma-terial's residual stress and fatigue life, which is an essential factor to consider for assuring the strength of the welded joint.

Automated summary

This paper experimentally tested the residual stress and fatigue life of T-type welded joints with a multi-pass weld in different directions. The results showed that the residual stress increased gradually with the number of welding passes, and the fatigue life also improved. Performing multi-pass welding in different directions affects the material's residual stress and fatigue life, which is crucial for ensuring the strength of the welded joint.