Research on morphology, porosity, mechanical properties of 7075 aluminum alloy repaired by arc welding and laser shock forging
Zhichao Chen,
Yongkang Zhang,
Yuanqing Chi,
Junfeng Gou,
Chaohui Lin,
Yuqi Lin
Affiliations
Zhichao Chen
Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment, Guangdong University of Technology, Guangzhou, 510006, PR China; School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China; School of Intelligent Engineering, Shaoguan University, Shaoguan, 512005, PR China
Yongkang Zhang
Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment, Guangdong University of Technology, Guangzhou, 510006, PR China; School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China; Corresponding author. Guangdong University of Technology, Panyu Zone, Guangzhou, Guangdong, 510006, PR China.
Yuanqing Chi
Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment, Guangdong University of Technology, Guangzhou, 510006, PR China; School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
Junfeng Gou
Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment, Guangdong University of Technology, Guangzhou, 510006, PR China; School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
Chaohui Lin
Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment, Guangdong University of Technology, Guangzhou, 510006, PR China; School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
Yuqi Lin
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
There are many problems in the arc welding repair of aluminum alloy parts, such as excessive pores, coarse grains, and low hardness. Introducing external energy excitation is an effective solution. In this paper, 7075 aluminum alloy parts are repaired using the arc welding - laser shock forging technique. The effects of laser-wire spacing, laser pulse energy and frequency, welding current and speed, and V-groove depth on the surface morphology, section geometric characteristics, and porosity of the repaired layer are studied. Additionally, the hardness and microstructure of the repaired layer formed by arc welding - laser shock forging and arc welding are compared. The results show that a fine surface morphology of the repaired layer can be achieved by selecting reasonable laser-wire spacing, welding current, welding speed, and V-groove depth. It is also advised to select the maximum laser pulse energy and frequency possible, in order to increase the aspect ratio, reduce the residual coefficient, minimize porosity, and decrease the maximum pore diameter of the repaired layer. When compared to arc welding alone, arc welding - laser shock forging has the advantage of reducing grain size and improving the hardness of the repaired layer.
