以前,在深度25毫米以上的狭窄通道内焊接时,需要辅助的机加或夹紧工序。因此,工作效率低,成本高,焊接焊缝质量差,焊后仍需返修,而且必须由熟练焊工进行焊接。最近研制成狭窄通道自动系统,该系统使用两种不同的柔性熔化极气电焊焊炬。一种是以空冷陶瓷焊接头为基础设计的微型焊炬,用于焊接平面的二维曲线型焊缝或直线型焊缝。另一种是以小型水冷铜焊接头为基础设计的导管式焊炬,用于焊接三维曲线型焊缝。 Previously, auxiliary welding or clamping procedures were required for welding in narrow passages of more than 25 mm depth. Therefore, the work efficiency is low, the cost is high, the quality of the welding seam is poor, the welding still needs to be repaired, and the welding must be carried out by skilled welders. Recently developed as a narrow channel automatic system, the system uses two different flexible melting gas arc welding torch. One is a miniature welding torch designed on the basis of an air-cooled ceramic welding head for two-dimensional curved or straight-line welds on a welding plane. The other is a catheter welding torch designed on the basis of a small, water-cooled brazed joint for the welding of three-dimensional curvilinear welds.