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.
Highlights
Modern engineering structures require micro welding of dissimilar metals
Laser micro welding of copper-aluminum dissimilar metals was conducted with an HWLW-300A energy negative feedback Nd:YAG pulse laser
Through half a century of development, laser micro welding of multiple dissimilar metals has been realized [5] [6] [7]. This does not mean that laser micro welding of all dissimilar metals can be realized
Summary
Micro welding of dissimilar metals can meet the needs in the manufacturing industry and is an effective way to realize multiple performance requirements, especially for microelectronics and with sensitive materials. Through half a century of development, laser micro welding of multiple dissimilar metals has been realized [5] [6] [7]. Mai et al [9] performed welding of dissimilar metals, including copper and aluminum, using a fluxless laser welding method, and they believe that the melting proportion of two materials is the key factor controlling welding results. An HWLW-300A energy negative feedback Nd:YAG pulse laser was used to successfully realize laser micro welding of copper-aluminum dissimilar metals, and the welding effect was good.
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