Some Studies of Nugget Formation Phenomena on Spot Welding (Report 4)

Effect of Friction of Electrode Force System on Weld Strength

Abstract

In spot welding, if there is friction in electrode force system, the actual electrode force increases at weld part, because the material can not expand itself during welding.
As a result, the weld tensile strength decreases. If the apparent electrode force is set at a lower value taking the increase of this electrode force into consideration, a sound weld can be obtained. However, there are troubles such as poor contact of mating plates and inconsistency of friction itself, so friction is not desirable for welder.