Study on the effect of high energy ultrasonic wave on MIG welding deformation and welding joint performance of LC52 aluminum alloy plate
IntroductionAs a medium to high strength aluminum alloy material, LC52 aluminum alloy has superior performance and is widely used in the manufacturing of large-scale equipment in aerospace and weapons such as aircraft, spacecraft, armored vehicles, etc. As an Al–Mg-Zn alloy, LC52 aluminum alloy is commonly used in MIG welding due to its large heat input, high oxidation and thermal conductivity, which results in uneven temperature field and local high temperature, leading to significant welding residual stress and stress concentration1,2,3,4, and even defects such as thermal cracks, pores, and welding slag and resulting in poor welding joint performance5,6,7,8,9,10, which seriously threaten the stability and safety of welded components during service. Frequency conversion or broadband critical refracted longitudinal wave (LCR wave) non-destructive testing methods can be used to accurately obtain the distribution of welding residual stress gradients and locate the above-mentioned defects...