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welding copper to aluminum is it possible?

welding copper to aluminum is it possible?

welding copper to aluminum is it possible?

(OP)
I would like to know if it is possible to weld copper and  aluminum together using a laser.  If so please share the secret.  The laser being used is a 4000 watt direct diode laser.  Also, would it be easier or possible to use a filler like brass, and weld the copper to brass then the brass to aluminum.  
                     Thanks.

RE: welding copper to aluminum is it possible?

I do not know much about laser welding, but I have joined Cu to Al before, as follows:

1) Silver solder a "butter layer" onto the Cu.
2) Weld, using Al filler, the Al to the Silver solder.

This may form the basis of a welding procedure for yourself.

Regards
Niekie Jooste

RE: welding copper to aluminum is it possible?

I don't know much about laser welding either. I do remember hearing that laser welding copper is supposed to be difficult because of its high reflectivity. However, here is a site with a reference to someone who has done it.
http://www.ilt.fhg.de/eng/jb00-s51.html

It mentions brittle, intermetallic phases developing in the joint zone, but they managed to overcome that.

One of the best ways to weld Al to Cu is friction welding -but that's probably no help.

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