It is difficult to operate stably because people are in an unnatural position during the welding. At the same time, the operation also has to lift the heavy welding torch and cable, which increases the difficulty of the operation. In addition, the molten iron in the molten pool is easy to sag and form a convex weld pass, which causes the molten iron to flow in serious cases. Therefore, the welding parameters should be strictly controlled in order to obtain a good weld formation.

First of all, ensure that the butt gap between the two plates is guaranteed to be 3mm, not too large or too small, too large will cause breakdown, welding tumor, the phenomenon of concave welding pass, too small will cause the back is not welded through, not fused.

                            Backing weld

Welding process: The welding parameters are set to 18.5V and 130A.

Angle before welding: Keep 90° on both sides of welding gun and groove, and 80-90° on the back side. When transporting the bar, the zigzag shape or positive crescent type is used, and the middle is stopped on both sides to prevent the edge from biting on both sides, and the middle is too high or through the silk.

                            Filler welding

Clean up the spatter and welding slag produced by the base welding before welding.

Welding process: Welding parameters are set to voltage 19V, current 140A.

Angle before welding: Keep 90° on both sides of welding gun and groove, and 75-85° on the back side. When the bar is used, the zigzag shape or positive crescent type of rod is used. The middle belt is stopped on both sides, which can prevent the appearance of too high in the middle of the biting edge on both sides. The short arc welding is used when welding. Cover welding begins when the weld pass is about 1mm lower than the base material.

                            Capping weld

Clean up the spatter and welding slag produced by the base welding before welding.

During the welding process, the welding parameters are set to the voltage 18V and the current 110-120A.

Angle before welding: Keep 90° on both sides of welding gun and groove, and 75-85° on the back side. When transporting the bar, the zigzag shape or positive crescent type transporting bar is used, the middle belt is paused on both sides, and the left and right sides are fully integrated with the base material to swing, which can prevent the appearance of the middle of the biting edge on both sides from being too high.

        HUARUI alibaba shop:

         https://topwelding.en.alibaba.com

        https://czhuarui.en.alibaba.com