The upper cover is fabricated by drawing die set, with much higher strength than welding process. It also avoids the corrosion of the joints caused by welding.
上盖采用整体拉伸成型的工艺制作而成，坚固性和外形的稳定性远远高于普通焊接成型工艺，也避免了因焊接所导致的铁板连接部位腐蚀的问题；
The upper cover is fabricated by drawing die set, with much higher strength than welding process. It also avoids the corrosion of the joints caused by welding.
上盖采用整体拉伸成型的工艺制作而成，坚固性和外形的稳定性远远高于普通焊接成型工艺，也避免了因焊接所导致的铁板连接部位腐蚀的问题；
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