The hardest way to weld is with an oxy-acetylene torch. This mixture of gases (acetylene and pure oxygen) burns hot enough to easily melt steel.
One neat fact about iron (and steel) is that they are quite flammable. You just have to get them hot enough and they will burn on their own, especially if you feed them with pure oxygen. An oxy-acetylene cutting torch uses acetylene gas only to pre-heat the steel. Once the metal starts burning you can shut off the acetylene and cut with just a blast of high-pressure oxygen gas. The burning iron generates enough heat to keep the cut going indefinitely, even through steel several inches (100-150mm) thick.
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