Why does arc jump from inside of cup when started

by Clarence
(New Jersey)

sometimes when starting a tig weld, the arc jumps from the sides of the tungsten inside the cup to the base metal.


High frequency current for tig welders can be a lot like voodoo.

scratches on the electrode, wire screen diffuser on a gas lens collet body, and other stuff can cause the high voltage low amperage high freq current to act a fool.

sometimes actually polishing electrodes with a 3m roloc scotch brite disc helps the issue.

Also , if the tig machine has a start current setting, raising the start current can help.

also, use as small a diameter tungsten electrode as feasible because using an electrode that is too big makes the problem a lot worse.

Return to Welding Certification 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.