消除熔合区白口层是当前补焊铸铁件的关键之一。我厂以生产磨床为主,其底座、床身和台面等铸件缺陷的补焊,经常在熔合区产生白口层。这对机械加工,尤其是刮削加工带来困难。经过几年摸索试验,认为采用同质焊条(铸248)大线能量电弧冷焊,能够消除熔合 Elimination of fusion zone white layer is the current one of the key welding cast iron parts. I plant mainly to produce grinder, the base, bed and table casting defects such as welding, often in the fusion zone to produce white stratum. This brings difficulties to machining, especially scraping. After several years of groping test, that the use of homogenous welding rod (cast 248) large-line energy arc cold welding, to eliminate fusion