What Is Brazing? There are lots of ways to join tubing together to build steel bikes, but they boil down to two basic techniques. You can weld them, or you can braze them. Again, there are lots of different ways to do each, but there’s a pretty basic technical distinction between the two. Advertisement Welding means joining two like pieces of metal together by bringing them to their melting point and introducing a like filler material to join them. In practice: You have two steel rods, you heat them up until the steel is at its melting point, and you join them by pooling a melting steel r...