Hi all,
New to TIG and been practising on some mild steel rectangle ERW tubing 50x25x3mm for a project I'm hoping to do soon. Trying to stick offcuts of said tube to one another for some practice. Tacked it ok, but when I gave it the full beans the porosity was ridiculous and at one point the bead started to grow upwards. I tried going over the bead again, but the more I did the worse it got.
The outside of the tube was clean. I'd hit it wish a silicon carbide wheel to get all the mill scale off and cleaned with acetone, but it was like the weld was reacting with moisture or chemicals. There were a lot of sparkles happening too.
Argon flow was set at about 8L/m. I think that the problem is due to schmoo and impurities on the inside of the ERW tubing. So, my question is, what's the best way to clean the inside of tubes prior to TIG?
Many Thanks!
Sid
New to TIG and been practising on some mild steel rectangle ERW tubing 50x25x3mm for a project I'm hoping to do soon. Trying to stick offcuts of said tube to one another for some practice. Tacked it ok, but when I gave it the full beans the porosity was ridiculous and at one point the bead started to grow upwards. I tried going over the bead again, but the more I did the worse it got.
The outside of the tube was clean. I'd hit it wish a silicon carbide wheel to get all the mill scale off and cleaned with acetone, but it was like the weld was reacting with moisture or chemicals. There were a lot of sparkles happening too.
Argon flow was set at about 8L/m. I think that the problem is due to schmoo and impurities on the inside of the ERW tubing. So, my question is, what's the best way to clean the inside of tubes prior to TIG?
Many Thanks!
Sid