Ferritic stainless steel resistance welding
The welding of ferritic stainless steel presents certain problems, at times underestimated. We must not only worry about the precipitation of carbides at the grain border, the embrittlement due to a constant 475°C, or the embrittlement due to a a permanent elevated temperature. The failure analysis conducted on ferritic stainless steel sheet metal demonstrates that welding within this particular class of steel products can potentially become disastrous. In this case, welding, with its rapid heating and cooling, provokes the precipitation of martensite at the border of the ferritic grain. This structure, very fragile and with low corrosion resistance, triggers a breakdown as evidenced in the images: decohesion of the crystal granules provokes the component failure.