oxygenless nitrogen

[bullgoose]

Hi there
just a quick question, why use oxygenless nitrogen shielding gas when welding.
Cheers
bullgoose

 

[backpurge]

I've only ever come across nitrogen being used as a shielding gas once, I seem to think it was for TIG welding a particular bronze alloy for a marine application, may be wrong as it was a very long time ago and I am now old and daft

The recomended shielding gas for TIG welding Duplex is argon with a couple of percent nitrogen in it

It's quite common to use nitrogen instead of argon for back purging stainless

 

[Slim Shady]

nitrogen is used for copper in hvac

 

[bullgoose]

thanks

Thanks
what is hvac ?
Bullgoose

 

[Luke]

Heating Ventilation and Air Conditioning, I believe.

 

[backpurge]

Thats interesting, what welding process are they arc welding the copper with

 

[Slim Shady]

their not arc welding copper. We use oxy acetylene and keep nitrogen in the pipe to keep it clean otherwise.

 

[backpurge]

Soory mate my mistake, was just going on the original question asking why people used nitrogen as a shielding gas