| Residual stress of titanium alloy welded structure is in a high tensile stress state, it reduces the reliability and mechanical property of the components. Ultrasonic impact treatment technique is developed to relieve residual stress. In this paper, ultrasonic impact treatment is employed to eliminate titanium alloy welding residual stress. A titanium alloy TA-15 butt weld joint is taken as a sample. Longitudinal weld residual stress distribution along the weld bead before and post ultrasonic impact treatment are evaluated by self-developed ultrasonic residual stress measurement system base on acoustoelaticity of critically refracted longitudinal wave. The residual stress distribution of weld joint after ultrasonic impact treatment was analyzed. High tensile stress near the weld bead change into a lower tensile state, the effect of ultrasonic impact treatment is obviously. Combining the characteristics of ultrasonic residual stress measurement system, the use of ultrasonic residual stress measurement system on real-time monitoring the welding residual stress elimination by Ultrasonic impact treatment method is proposed in production. |
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