我厂生产16吨汽车起重机,每根吊臂长9米多,内外臂均为箱形断面(见图1),设计上要求填满四个角上的四条焊缝,原采用手工电弧焊,劳动强度大,工作效率低,质量很难 Our factory produces a 16-ton truck crane. Each boom is more than 9 meters long. The inner and outer arms are box-shaped sections (see Figure 1). The design requires four welding seams on four corners. The original manual arc welding was used. Labor intensity, work efficiency, quality is difficult