Research on the Welding Process of 20mm Thick TC4 Titanium Alloy Melting Electrode Argon Arc Welding
This article takes 20mm thick TC4 titanium alloy plate as the experimental object,uses different gas ratio schemes for MIG welding,and analyzes and studies the mechanical properties of the welded joints.The results show that during the MIG welding of medium and thick titanium alloy plates,Ar50%+He50%gas is easily used as the shielding gas.The addi-tion of helium gas can improve the fluidity of the melting pool,reduce welding spatter,and improve welding efficiency.As long as a suitable gas protection drag cover is made,efficient and high-quality welding can be achieved,the welding opera-tion is simple,and it is easy to achieve robot automation welding.During the titanium alloy MIG welding process,it is neces-sary to control the interlayer temperature.As the welding thermal cycle temperature increases,the content of martensite gen-erated in the weld increases,the hardness of the weld increases,and the plasticity decreases.Therefore,a high current rapid welding process should be adopted.
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