关键词: 车身轻量化；铝板开裂；熔化极惰性气体保护焊接；力学性能

Abstract: With the deepening of the process of vehicle lightweight, the application of aluminum panels is becoming increasingly widespread. Stamping cracking is the main process challenge faced by aluminum materials in vehicle applications, and the high scrap rate caused by stamping cracking seriously affects production efficiency and cost control. This study developed an integrated method for repairing and quality verification of cracked aluminum panels based on a systematic analysis of cracking issues and the material properties of aluminum panels and established the repair process with melt inert-gas (MIG) welding as the core method. Mechanical tests demonstrated that samples after MIG welding exhibited significant improvements in tensile strength, yield strength, and maximum breaking load. Results from production applications showed that this method not only substantially enhanced the mechanical properties of repaired cracks but also reduced the overall part scrap rate to approximately 5%. This research provides an effective engineering solution for the repair of aluminum plate stamping cracking, offers a basis for repair quality evaluation through comparative qualitative testing, filling the industry gap, and has significant promotion and application value.

Key words: lightweight body; aluminum panel cracking; melt-insert-gas welding; mechanical performance