关键词: 车身精度；焊接变形；弧焊骨架；精度提升

Abstract: Traditional car bodies generally adopt a structure formed by sheet metal stamping and resistance welding. However, in certain scenarios, it is necessary to develop car bodies with a structure that uses a skeleton for internal support and a skin for external coverage. However, due to factors such as arc welding stress deformation, the accuracy of such skeletons is difficult to guarantee. In order to investigate the causes of the problem of insufficient skeleton accuracy and its improvement methods, this article analyzes from the aspects of component manufacturing accuracy, welding stress deformation, structural design, and benchmark selection, and summarizes and elaborates on a solution to improve the welding accuracy of a car body skeleton.

Key words: Body accuracy; Welding deformation; Arc welding frame; Accuracy improvement