[pavetim]

I know doing like 304 exhaust you need to back purge but just for practice if I don't purge will effect the outside weld orcis it mainly for the inside? I want to just grab some tube and practice on

[tweake]

if your going to practise tube, then back purge. you need to know if your penetrating etc so you need a clean inside bead.
plus you need to practise purge setups.

to practise without purge, just pad beads on a thick plate.

[pavetim]

Padding beads on a thick plate is way different.t than trying lap or butt joints on thin exhaust tube. But ok I will just practice with purge

[cj737]

You can practice without purging. Shoot, even some “high end” exhaust systems don’t purge on stainless. Makes me angry, but that’s how some folks roll.

If you have a clean butted fitment, you can practice without filler too. Lower your amps and get accustomed to moving and controlling your puddle. I like to use pulse in these scenarios.