BISCO INTEGRATED SERVICES CO . LTD
Heat Treatment Products
Main ProductsWelding, Casting, Forging, Rolling, Forming, Drawing, Hammering, Bending, Shearing, Machining service.
Company ProfilePost Weld Heat Treatment Services ( PWHT ) is defined as one of heat treatments done after welding/machining to improve the Chemical mechanical properties of weldment / machined surfaces. In concept, PWHT covers many different potential treatments. However, in steel fabrication, most common procedure used is Stress Relieving.
Post weld heat treatment reduces the residual stresses formed during welding. It also restores the macro structures of the steel. PWHT requirements are to be strictly followed in high pressure applications to avoid component failure.
PWHT eliminates the effects by heating , soaking & cooling the weld area in controlled manner to temperature below the first transformation point , giving the macro structure sufficient time to readjust to its original state & removing the residual stress.