According to the different product structure, butt fusion welding process and lap seam welding process are used to respectively weld left and right half shell of upper body.
上体左、右半壳直焊缝视产品结构不同，分别采用对接熔化焊和搭接缝焊工艺。
Welding and allied processes. resistance spot, projection and seam welded lap joints. classification of defects with explanatory comments.
焊接和有关技术。电阻点焊凸焊或缝焊搭接接头。带解释的缺陷分类。
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