primeweld tig225x banner 2

Porosity in steel root pass on pipe

by John Heindel
(Apache Junction Arizona USA)

Why am I getting porosity when making a root pass? I have a Lincoln 175 TIG machine argon cooled. I'm in Arizona and it is hot! I'm using RG45 steel rod and 2%thorated tungsten


Ditch the rg45 wire ...its strictly for gas welding and does not have the deoxidizers needed .

get some er70s2 or 3 and your porosity should go away.

good luck,


Return to tig forum.

Enjoy this page? Please pay it forward. Here's how...

Would you prefer to share this page with others by linking to it?

  1. Click on the HTML link code below.
  2. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.