Research on Defects Control of Niobium Tungsten Alloy by Laser Welding

Abstract The laser welding experiment of Nb521 niobium-tungsten alloy with 1.0mm thickness was carried out, and the effects different edge preparation states, including fast wire cutting + milling slow no milling, on weld formation were analyzed. results show that weldability is very good. parameters are in a wide range, good can be obtained easily. effect states small, all welded joints broken base metal zone far away from beam. Based welding, forming analysis argon arc repair out. defects such as cracks oxidation could controlled effectively by optimizing process. When ratio range 30% to 50%, still have tensile properties. average strength reaches 98.9% elongation after fracture 83.8% metal.