Study of Interfacial Microstructure and Phase Evolution of Al/Cu Arc Welding-brazing Joint

doi:10.3901/JME.2020.06.017

Abstract

Abstract: Using a bypass coupled arc method, an aluminum plate is joined to a red copper plate, and the evolution of interfacial microstructure is studied after post-weld annealing. The morphologies of interfacial microstructure for welding and annealing state are observed by scanning electron microscopy, and the interfacial phase is identified by energy dispersive spectrometer and X-ray diffraction methods. The thermodynamic-dynamic model of intermetallic compounds at the interface is established by Monte Carlo combining Cellular Automata, and the evolution behavior of intermetallic compounds is analyzed. The results show that a welding-brazing joint can be obtain by bypass coupled arc method, three kinds of intermetallic compounds of CuAl, Cu₉Al₄, and CuAl₂ are formed at the interface of Al/Cu weld joint after annealing for 3 hours at 250-400 ℃. With the increase of annealing temperature, the intermetallic compound thickness at the interface increases, and the maximum thickness is 38.39μm. The inter-diffusion and interface chemical reaction determine the formation of intermetallic compounds at the copper-aluminum interface.

Key words: Cu/Al weld joint, annealing, microstructure, interface evolution

CLC Number:

TG146

HUANG Jiankang, YANG Tao, YU Xiaoquan, WANG Ziyi, FAN Ding. Study of Interfacial Microstructure and Phase Evolution of Al/Cu Arc Welding-brazing Joint[J]. Journal of Mechanical Engineering, 2020, 56(6): 17-23.

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