These include resistance, continuous fusion, and heated fusion methods. Butt welding can be performed in a variety of ways. Butt welding or pipe butt welding is a special welding process that joins parts of steel pipes, angles, I-beams, sheet metal, and other fittings or metal structures across the plane of the contacting elements using wire or other materials. The choice of butt welding method for beams, valves, and other metal elements depends on the grade of the parts to be joined and their quality. Subtle features and peculiarities of butt welding There are two types of welding methods: left welding and right welding.