关键词: 门盖内外板固定；单边焊；质量缺陷；连接强度问题；CMT；质量改进

Abstract: In this paper, the purpose, common method of pressing edge fixing for inner and outer panel of door and cover of body in white in automobile manufacturing process and the surface quality defect and bonding strength problem are studied briefly. In order to solve these problems completely, a new method is explored in this paper. Without contacting part surface, the pressing edge of inner and outer panel can be fixed with a good bonding strength, namely a fixing technology of cold metal transfer (CMT) in the form of spot welding for pressing edge of inner and outer panel of door and cover. It is analyzed and demonstrated from equipment principle and process characteristics. After equipment installation, process commissioning and quality verification etc., this improvement is put into use in models of series production and the product quality stability is verified in practical production. The production efficiency has also improved significantly and the maintenance cost has reduced effectively. This improvement has a high promotion value in the automobile manufacturing industry.

Key words: Fixing for inner and outer panel; Single side welding; Quality defect; Bonding strength problem; CMT; Quality improvement