我厂购置的CO_2气体保护焊焊机,大多是NBC-400型半自动焊机,使用鹅颈式焊枪。焊枪结构如图1a所示,鹅颈管利用螺钉固定在枪体上。枪体结构如图1b所示,400多mm长的颈管插入枪体部分过短,根部受力较大,所以固定性差,不稳定。同时,受焊接时的热影响,孔受热变形,时间一长,螺钉松动,颈管晃动,影响焊接质量。另外,枪体结构形状复杂,要求高,加工难度大。 CO_2 gas shielded welding machine purchased by our factory is mostly NBC-400 semi-automatic welder, which uses gooseneck torch. Torch structure shown in Figure 1a, gooseneck with screws fixed on the gun body. Gun body structure shown in Figure 1b, 400 mm long neck tube inserted into the gun body part is too short, the root force is larger, so the poor fixing, unstable. At the same time, affected by the heat of welding, the hole by the heat deformation, over time, loose screws, neck shaking, affecting the quality of welding. In addition, the gun body structure is complex, demanding, difficult processing.