Like stick welding said, MIG has taken over in alot of areas that used to be stick welding territory. A large part of industries like ship building, etc have gone to sumerged arc welding with large diameter wire. Heck for things like buildup work they even make wire kinkers that cause the wire to wave back and forth as it exits the electrode tip so it creates a wider bead than a straight pass would. I watched a show a few years back where they were building a bridge somewhere. The columns that supported the bridge were like 6 feet in diameter and several inches thick. They had a machine set up on it that carried the MIG feeder around and around it to fill the joint. I forget exactly how many passes it took,(I'm thinking it was several hundred), but to keep everything in at the proper temp they had the whole column wrapped in a big 'tent' and the welding machine ran 24/7 from the time the weld was started until it was complete. Granted several skilled welders working continuiously could do this same job stick welding it, but with the machine it took nothing more than a couple of people trained to operate the machine, that didn't have to be 'skilled' welders, to get the same job done in alot less time than it could have been done manually.
In other words MIG has come along way from the days of bare wire. As much as people want to bad mouth it, it is an excellent welding process, and is as good or better than any other welding process, when, like anything else, it's done properly.
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