一、施焊方向问题使用 CO_2半自动焊接一般多习惯采用左焊法(右手持焊枪)。焊枪向施焊方向相反的一方倾斜。这就形成了:向前推着焊,保护气体向前吹的现象。如图:这种焊法,明显减弱了对熔池后部,半液态金属的气体保护作用。操作者一旦掌握不好,就会造成蜂窝状气孔或面包形焊缝。在水平位置,坡口焊缝焊接时尤为严重。 First, the direction of the welding direction The use of CO_2 semi-automatic welding more commonly used left-handed welding method (right hand holding torch). The welding torch is inclined to the opposite side of the welding direction. This formed: Push the welding forward to protect the gas blowing forward. Figure: This welding method, significantly weakened the rear of the pool, semi-liquid metal gas protection. Once the operator is not well mastered, it can result in honeycomb-like blowholes or bread-shaped welds. In horizontal position, bevel weld is particularly severe.