aluminum welding

[RE52]

hi everybody,
I want to know that for aluminum welding with MIG process is it necessary to purge the root side,we have backing ring for the 10" aluminum pipe.(bus bars for the power plant)
thanks.

 

[metengr]

Here is one of the better web sites regarding information on welding of aluminum alloys;

http://www.alcotec.com/default.html

 

[metengr]

The answer to your question is you do not need backing gas for the weld root.

 

[metengr]

Last but not least, here is one other web site that provides general recommendations for welding of aluminum by process, recommended filler metal, shielding gas, etc.

http://www.jwharris.com/welref/procs/