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桥式起重机主梁主要以箱形为主。过去采用埋弧自动焊,劳动强度高,除锈工作量大,而且对气孔敏感性很强,易焊偏;自从采用多头CO_2气保焊以来,不但焊前不用除锈、焊后不用打渣,而且可减少翻个时间,生产率提高约2倍。采用固定式CO_2气保焊机头,可将焊丝自动对准焊缝,焊接时工件移动,机头固定。固定式机头的构造原理,和一般半自动CO_2气保焊手把相同,有CO_2气体和水循环冷却系统。导电咀的位置最好和喷咀平行,或短0.5～1毫米,如果过长,易与主梁相碰造成短路,损坏导电咀。图1为机头简图。
Bridge crane main girder box-based. In the past, the use of submerged arc welding, high labor intensity, rust workload, but also highly sensitive to stomatal, easy welding deviation; since the use of long CO_2 gas welding, not only without rust before welding, welding slag , But also reduce the time overtime, productivity increased about 2 times. The use of fixed CO_2 gas welding head, welding wire can be automatically aligned with the weld, the workpiece moves welding, the nose fixed. Fixed nose structure principle, and general semi-automatic CO_2 gas welding handle the same, there CO_2 gas and water circulation cooling system. The best location of the conductive nozzle and nozzle parallel, or short 0.5 to 1 mm, if too long, easily collide with the main beam to cause a short circuit, damage to the conductive nozzle. Figure 1 for the head sketch.