Investigation on Arc Brazing Technology of Aluminum and Steel
Aluminum is being widely applied to automobile body to reduce the weight.The key problem is connecting aluminum alloy to steel of car-body.In this paper,aluminum and steel are connected by Tungsten Inert Gas(TIG) arc brazing and Cold Metal Transfer(CMT) arc brazing.The weld formation of the two welding methods and component of intermetallic compounds(IMC) are investigated,and compared the joint's tensile-shear strength with traditional Self-piercing riveting.The results show that the joints made by arc brazing have higher tensile-shear strength and lighter weight.Due to the low welding heat input,the weld formation of CMT is better than that of TIG.And the tensile-shear strength of CMT joint has reached 85% of the base metal strength.