Ultrasonic nondestructive testing and regulation technology of residual stress

Abstract

Residual stress regulation technology is a procedure to reduce residual stress by means of high-energy ultrasonic after stress testing. Based on acoustoelasticity theory, the relationship between ultrasonic propagation and stress in aluminum alloy is researched. With the principle of exciting ultrasonic critically refracted longitudinal wave obtained, the ultrasonic stress testing system is established. For in situ regulation of residual stress, the interactive relationship between high energy ultrasonic and residual stress field is studied. We reduced the residual stress and improved stress state of components through effective control of high-energy beam and incentive mode. Thus in situ relief and control of local residual stress distribution in mechanical components in service are realized. The technology can improve the whole strength, anti-fatigue and corrosion resistance of mechanical components and enhance their service life, safety and reliability, and now is widely used in the stress testing and relief of aluminum alloy welding components.