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。
The structure of the oil remover includes a cylinder-shape outer shell jointed by two half.
其结构是，它包括两半合对在一起的筒状外壳。
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