Analysis of Laser Micro Welding of Copper-Aluminum Dissimilar Metals and Its Mechanism

Abstract

Micro welding of dissimilar metals can meet many performance requirements for modern engineering structures. In this experiment, laser micro welding of copper-aluminum dissimilar metals was conducted with an HWLW-300A energy negative feedback Nd:YAG pulse laser. By using the overlap welding method with copper on aluminum, with the laser energy being distributed unevenly, good weld joints were obtained. In this paper, the welding mechanism was analyzed from aspects such as welding temperature and the specific heat capacity of the solid metal. Existing defects were identified, and a feasible improvement scheme was proposed.and has currently become one of the most important and advanced manufacturing technologies in fields ranging from the aerospace industry to ship building and automobile manufacturing. Through half a century of development, laser micro welding of multiple dissimilar metals has been realized [5] [6] [7].Nevertheless, this does not mean that laser micro welding of all dissimilar metals can be realized. The process of laser micro welding of dissimilar metals relates to multiple physical effects [8], so there are still many difficult problems to solve both experimentally and theoretically. Studying laser micro welding of more dissimilar metals and its mechanism remains a theme explored by researchers.Copper and aluminum metals are widely used in electronics. Partial substitu-J. Huang et al.

Weldability Study of Round Aluminium Magnet Wires for Lightweight Low-Cost Traction Electric Motor Applications

“…Both Cu samples have the largest mean pore size compared with Al. This would be expected due to the difference in thermal properties (TABLE I) and the effect this has on the solidification rate and weld characteristics [43]. In addition, the high energy required to melt the copper could have led to excessive Al evaporation and an unstable melt flow.…”