METHOD FOR SUPPRESSING BRITTLE FRACTURE ALONG THE FRICTION STIR WELDED ZONE FOR AUTOMOTIVE BODY APPLICATION

摘要

The present invention relates to a method for preventing brittleness of a welded portion during friction stir welding of a vehicle body, and by applying magnesium to the surface of the shoulder part and the fin part of a welding device rotating body mainly made of tool steel by physical vapor deposition (PVD) Elongation and fatigue resistance of the welded portion of the dissimilar metal sheet, which is an aluminum-magnesium alloy, by suppressing the constitutional Liquation in which the coated magnesium is deformed together with the base metal to form an intermetallic compound during welding (FSW). The present invention relates to a method for preventing brittleness of a welded portion during friction stir welding of an automobile body capable of improving quality by improving the back and the like.;Automobile, aluminum alloy, magnesium alloy, friction stir welding, brittle