If you need to use MIG/MAG gas shielded welding or flux cored wire gas shielded welding to weld a thin metal cover on a thick steel pipe, if the welding current cannot be adjusted correctly during welding, it may lead to two situations:
First, in order to prevent thin metal from burning through and reduce the welding current, the thin metal cover cannot be welded to the thick steel pipe at this time; Second, the welding current is too high to burn through the thin metal cover. What should I do at this point?
There are two main workarounds:
(1) Adjust the welding current to avoid burning through the thin metal cover, and at the same time preheat the thick steel pipe with a welding torch, and then weld the two metal structures by thin plate welding process.
(2) Adjust the welding current to suit the welding of thick steel pipes. When welding, keep the residence time of the welding arc on the thick steel pipe 90% and reduce the residence time on the thin metal cover. It should be noted that a good welded joint can only be obtained when proficient in this technique.