The experiment of laser deposition GH4169 powder on the QAL10-4-4 aluminum bronze is investigated. The tensile strength of the deposited sample is tested

the formation and microstructure of the deposited joints are analyzed by optical microscope and energy dispersive spectrometer. The results show that the appearance of laser deposited joint on the bronze/steel dissimilar materials is favorable

there is no cracks and blowholes in the conjunction of the joint interfaces. The tensile strength of joint can reach 665 MPa. The sample breaks in the heat affected zone near the copper side. The interface of laser deposition sample is metallurgical combination form. The microstructure of interface is mainly nickel-rich γ′-phase

nickel-rich γ′′-phase

iron-rich α-phase

iron-rich γ-phase and copper-rich ε-phase solid solution. The optimum welding parameters is that the laser deposition powder of GH4169

laser power of 1 200 W

scanning speed of 0.009 m/s

powder feeder reading of low%

load powder gas of 400 L/h

lap rate of 40%

spot diameter of 2 mm and the height of single deposited layer of 0.3 mm.