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A spot welder has 2 copper contacts that compress two sheets of sheet metal. When current is applied to the contacts the steel in the sheetmetal acts as a resistor and causes enough heat to be formed that the two pieces melt together between the copper contacts.

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13y ago

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Spot welding is known as resistance welding because the the two pieces of metal melt together at the point of highest resistance to current flow, basically when the electricity flows through the pieces it heats up at the point of highest resistance that is where where the metal pieces touch and in a direct line from the two contact tips on the spot welder. Simple!


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