Porosity when TIG welding laser cut steel plate (pickled and oiled)

[Munkul]

we use these for most clean-up:

http://www.wholesaleengineeringsuppl...-discs-45.html

in a 4.5" angle grinder, way more power than you'll ever get from air.

Not sure why the charts say you need more gas for carbon steel and aluminium. We've always found the opposite - more gas for stainless, a little less for carbon steel, even for code work. And much less for aluminium.

You're using these fancy gas cups - you don't need em, they don't work well unless you have a massive gas flow. Your tungsten should stay silver-grey - if it doesn't, you have a gas flow issue somehow.

Stick a normal gas lens on there with a No.7 ceramic at 15 CFH flow, it'll do 95% of anything you want to weld.

[Mikel_24]

Norton has them.

https://www.nortonabrasives.com/en-g...ze-rapid-strip

Thanks Dave! I found them on the size I was looking for (125mm) and cheaper when bought several at a time (from Germany though)

Mikel

[denverguy]

Thanks Dave! I found them on the size I was looking for (125mm) and cheaper when bought several at a time (from Germany though)

Mikel

Note that the Norton Blaze are a ceramic abrasive and the Scotch-Brite's are silicon carbide. I find the Scotch-Brite discs work significantly better on mill scale as Norton Blaze tend to clog on heavy mill scale.