According to the different product structure, butt fusion welding process and lapseam 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。
2
Joining together must clean up, to ensure flat-fell seamlap closely.
拼接处必需清理干净，以确保拼缝搭接紧密。
3
Welding and allied processes. resistance spot, projection and seam welded lap joints. classification of defects with explanatory comments.