Welding was first performed during the Bronze Age. Items were cast and when two or more had to be joined they poured molten bronze in the joint which melted the edges and upon cooling became one solid piece. This carried over into the Iron Age. Somewhere along the line acetelyne was discovered and was used to melt pieces to join them. Then came a cheap way to produce pure oxygen which increased the temperature of the acetylene flame. Along came electricity and it was quickly adapted to provide the heat necessary to melt metal. Many individuals used this and patents were issued to protect some of them, but no one person is credited with inventing the process.
In 1800, Sir Humphry Davy discovered the short-pulse electrical arc and presented his results in 1801, which ultimately led to what we consider welding today.
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