Abstract
In order to reveal the welded joint fatigue crack growth behavior under compressive stress by adjusting the variable polarity Tungsten Inert Gas arc Welding process, prefabricate the joint with weld defect for fatigue experiments. Change the welding process parameters to control the depth of the defects including incomplete penetration and stomata. Comparing the welded joint fatigue life with the joint after Ultrasonic Impact Peening process, study the effect of UIP process on fatigue life of the joints with defects, and the mechanism of the improvement of the fatigue strength.
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