Some Studies of Nugget Formation Phenomena on Spot Welding (Report 3)

The case of spot welding restraining the upward-movement of electrode with stopper

Abstract

In the spot welding, the welded part expands and pushes up the electrode tip during welding current flow.
If we restrict this expansion, electrode force increases and weld strength drops considerably as the result. We made experiments on mild steel, stainless steel and aluminum alloy to corroborate this phenomenon using a special spot welder with modified air cylinder and restraining the upward-movement of electrode with stopper.