Weld cannot have empty solder, leakage solder, solder to wear, head of welding wire of stomatic, remain, burr, need polish fruity: Ying Guangjie of tube wall surface is flowing, feel is fluent.

• 焊接处不可有虚焊、漏焊、焊穿、气孔、残留焊丝头、毛刺，并须打磨圆润：管壁表面应光洁平滑，手感流畅。