primeweld tig225x banner 2

What causes "sugaring" when TIG welding?

by Bob
(Tacome, Wa.)

I'm going to take a stainless TIG test, I took one a few years ago and busted test. All the I was told was I didn't pass because of sugaring. I thought the weld looked great, what did I miss?


You might have lost your purge on the root or second pass. Sugaring is oxidation of the back side of a stainless weld that is also called granulation because it looks like sugar granules.

under magnification, its easy to see why it is something to avoid. It is a weak area that will trap bacteria, corrode, or crack prematurely.

to avoid sugaring, make sure you maintain your argon purge until at least the second pass is done.

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.