problem in elec trical resistance upsetting : LUSENET : Resistance Welding : One Thread

We are upsetting and forgine the valve steel of EN52, 21 4 n etc for I C Engine applications.

we are frequently having a problem of bulb folding in eltrical upsetting, which resulting crack in the valve head.

how to avoid/reduce the crack and bulb folding , please help me

-- Gopalakrishnan (, March 12, 2004

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