Microstructure and properties of aluminum/copper blue-red hybrid laser welded joint
In order to realize efficient and reliable welding of power battery,1050 aluminum/T2 copper lap welding was car-ried out by using blue-red laser heat source.The effects of laser power on the microstructure,phase distribution mechanic-al properties and electrical conductivity of the joint were in-vestigated.The results show that the weld surface of Al/Cu lap joint is smooth and the section is"T"shape.When PB(Blue laser power)remains 300 W,PR(Infrared laser power)in-creases in 700 W～1 400 W,the copper side penetration depth increases from 60 μm to 1 000 μm,achieving a good metallur-gical bonding with PR = 800 W.The weld microstructure is composed of Al solid solution,Al-Cu eutectic alloy and Al2Cu intermetallic compound phases.With the increase of laser power,Al4Cu9 phases appear locally in the weld,and AlCu,Al4Cu9 and AlCu3 phases appear at the edge.When PR = 800 W,the weld strength reaches the maximum of 108.6 MPa,and the contact resistance reaches the minimum of 94 μΩ.The crack starts from the junction of two plates region(Al2Cu)and extends along the weld edge from the outer Al2Cu region to the junction of Al solid solution and Al-Cu eutectic alloy at the bottom.The fracture form is cleavage fracture.
hybrid laser weldingAl/Cu dissimilar materi-alreaction at interfacemicro-structuremechanical proper-tiesconductivity
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