The casting of 5356 welding material

Melt quality control technology of 5356 alloy welding material was studied.5356 alloy ingot of high property was obtained by the optimization design of standard 5356 alloy composition,impurity control and plasma purification/degassing,and by using sodium-free auxiliary material and sodium removing agent.Hydrogen content of ingot was detected by solid-detecting method.The result shows that the requirement of H0.15 cm3/100 g and Na≤1×10-3 is satisfied.The microstructures before and after homogenization annealing were analyzed by OM,SEM,TEM and energy spectrum method.The results show that welding composition and processing technology are reasonable and feasible,no coarse primary phase and impurity are found in the microstructure analysis.The microstructure is fine,and homogeeous,and no obvious pores are found.Na content reaches the expected aim.