Welding Aluminum Bronze

Date 08-25-2003 17:44

I am welding Aluminum Bronze (C61400) using GMAW CuAl-A2. I am joining a 2" section to .38" thick section and it runs better with a higher preheat, around 4-500 F. I have read interpass temperature should not exceed 300 F. I have also read that that if preheat is too high hot shortness can become a problem. I have had no problems with cracking so for - so my question is, are there any other problems associated with a preheat greater than 300 F?

Any input would be appreciated.

By brande

Date 09-06-2003 06:09

Any copper alloy can be a problem when preheat or interpass approached 1000 degrees F.

Copper at this high heat likes to absorb CO and other gases/impurities at that temp.

As a rule of thumb, keep your preheat to a minimum, your weldment will warm up in time.

If you are using a wire process, consider using a hi helium mix, which will help out.

Additionally, a 400 amp power source would be considered a minimum, again if a wire process is chosen.

Personally, I have had good success with the pulse process in this app.
Contact me for details!

Good Luck

Brande