Just wonder what the benefits of back purging are. What materials is it done with. Why is it done. How is it performed. Etc. Just tryin to get a grasp on the concept. Any input would be helpful and yes I did search the subject and came up with nothing.
Thanks

 

its just running your shielding gas over the back of your welds when tigging. helps get better penetration, and keeps impurities from getting into the weld on the backside.

the easiest way to setup is to T off your regular argon line, and have a valve of some sort.

more complicated($$$) ways include another tank etc...


i probably wouldnt do it unless youre selling your welding...or need to meet a code, or are paranoid.

 

You can get a double flow meter if you only have one bottle, or you can get another bottle, which is what i do.

 

Some links to products and stuff would make this thread much bigger.

 

I'm going to be welding Sch. 40 304L SS for manifolds. I will also be welding 304 for downpipes and dump tubes. And 6061 al. for intercooler piping. I'm just getting a feel for the best techniques and such.

 

So if I was welding a turbo manifold i would just run some argon through the pipe as I am welding? Do i need to plug one end of a pipe to try and contain some of the argon or anything?

 

yes, yes

 

What kind of tape do you guys use to hold a cap on your pipes when backpurging? I made the mistake of using duct tape once...SEVERE contamination.

 

I was thinking about using a cork. I don't know what temp it will with stand but I might give it a try.

 

Use tin foil and some wire or use aluminum duct tape or use the tape specially made for it that cost a **** ton of money