Reliable Copper and Aluminum Connections for High Power Applications in Electromobility

Experimental and Numerical Investigation of 2A16 Aluminum and Pure Copper Magnetic Assisted Dissimilar Laser Wire Feed Welding Brazing

“…Aluminum, with excellent resistance to corrosion, low cost and and density; and copper, with high thermal and electrical conductivity, both are widely used in industry. The production of the aluminum-copper(Al/Cu) hybrids would enable a solution for engineering to undergo reducing mass and cost, improving the multi-material properties [4][5]. But the preparation of Al/Cu hybrid system is a signification challenge work due to their vast differences in their physic properties such as thermal conductivity, melting point, and expansion coefficient [6][7].…”

Influence of Temperature and Wavelength on Optical Behavior of Copper Alloys

“…Usually absorption rises with increasing temperature of the material and decreasing laser wavelength [1]. Consequently there are ambitions [1,2] for welding copper with laser radiation in the visible spectra, such as green laser radiation produced by frequency-doubled Nd:YAG lasers combined with infrared radiation from conventional Nd:YAG lasers. Hereby the preliminary green laser spot has already generated a small melt pool which provides an enhanced absorption for infrared laser radiation which is emitted with a small time delay.…”

“…Hereby the preliminary green laser spot has already generated a small melt pool which provides an enhanced absorption for infrared laser radiation which is emitted with a small time delay. The combination of two different laser sources is still necessary to enhance process stability and generate larger amounts of melt, because frequency-doubled laser sources are only available in the sub-kilo-Watt range [1,2]. Although absorption is an important parameter for laser beam welding, only few investigations to measure the absorption of copper in dependence of temperature are published up to now.…”