welding p 91 / 9 % chrome

I am welding 2 inch sch. 80. P 91 socket weld. I can't get it to do anything. What amperage should I be using. I am using er 90s b9 tig wire. Do you have any tips for this procedure. Im using a standard tig rig with gas lens. Pre heat to 400 before start. Puddle is like soldering copper with no paste., or it will weld good and bad then maybe good again.


I would estimate somewhere around 125---150 amps would be ok for the root pass. and about 100-125 for the rest.

it sounds like you are having argon gas problems.
like either a leak, or bad gas.

that stuff should weld great .

if your electrode is not staying shiny silver, go after the gas issue.

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.