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Brazing versus Gas Welding A frequent question is "what's the difference between brazing and welding". Brazing is melting bronze brazing rod between two or more pieces of metal to join them together. In the case of steel, bring the two pieces of steel to red hot and then flow the bronze between the separate pieces. Gas welding on the other hand requires that the steel be above red hot. As you heat the steel it moves from red hot to yellow hot to white hot. Between yellow hot and white hot the steel begins to melt. It is at this stage, when the steel is melting, that the steel is ready to be welded. The time difference between red hot, yellow hot and white hot is dependent on the thickness of the steel. Thicker steel will take longer to get up to welding heat compared to heating thinner material. If the steel gets too hot it will burn up or melt. On thinner material this means that you will blow a hole in the metal. You have to be quick and pay close attention to when the steel starts to melt. Gas welding only applies to steel, not copper or brass. The video below explains this best. Close up of the braze and weld.
Remember, when brazing hot rolled steel grind the metal down to base metal for a good braze. Back to table of contents
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