Welding Equipment & Welding Supplies since 1993
Call Us On
0845 899 4400
01908 699802
0845 899 4400 | 01908 699802
Tel 01908 699802
(9am-5pm Mon-Fri)
Milton Keynes, United Kingdom
« Back to blog homepage

Tungsten Tig Electrodes

Tuesday, 18th June 2019

The choice of type and diameter of Tungsten Tig Electrodes is important as it’s from the Tungsten Tig Electrode that the Arc is struck.

Also important is how the Tungsten Tig Electrode is sharpened when used for DC Tig Welding.

Types of Tungsten Tig Electrode

Tungsten Tig Electrodes are colour coded, making them easy to identify.

  • Gold = 1.5% Lanthanated Multi Type Tungsten Tig Electrode. Can be used pretty much any material in AC or DC output. These are the only Tungsten Tig Electrodes we stock as they are the most versatile.
  • Red = 2% Thoriated. Use for Tig Welding Mild Steel and Stainless Steel.
  • White = Zirconiated. Use for Tig Welding Aluminium.
  • Grey = Ceriated. Use on most metals AC or DC output (I prefer Gold type).
  • Green = Pure. Use for Aluminium & Magnesium
Tungsten Tig Electrodes

There are a few other types of Tungsten, but the above covers most.

Sharpening

Tungsten Tig Electrodes only need to be sharpened when used in DC output Tig Welding applications.

How the Tungsten Tig Electrode is sharpened is important.

There are different opinions on the exact shape of the point, but my preferred profile is to have a point that’s sharpened to a sharp point that looks a bit like a sharpened pencil.

A good guide is to make the length of the point 2½ times the diameter of the Tungsten. So a 1.6mm diameter Tungsten should have a point around 4.0mm long (1.6 x 2.5 = 4.0). A 2.4mm Tungsten should have a point around 6.0mm long (2.4 x 2.5 = 6.0).

It’s important that grinding lines run along the length of the Tungsten NEVER around the point as this can cause arc instability.

NB – Always wear suitable respiratory protection when grinding.

Tungsten Tig Electrode Sharpening

AC Welding and Tig Tungsten Electrodes

If you’re intending to Tig weld with an AC output, Aluminium for example, there’s no need to sharpen the Tungsten.

Having said that, it’s a good idea to put a small chamfer on the end of the Tungsten.

Once you start welding the end of the Tungsten will form into a dome.

IMPORTANT – If the dome on the end becomes a ball that is larger in diameter than the Tungsten itself, you need to use a larger Tungsten!

How much of a Tig Tungsten Electrode should stick out

There’s no straightforward answer to this one as it depends on a number of factors.

As a general rule, I would have around 5-6mm of the Tungsten sticking out of the Ceramic Gas Shroud.

The important thing is that gas shield integrity around the arc is maintained. So if, for example, you’re welding into a corner, or into a blind hole, good gas shield integrity is easy to maintain, so a greater Tungsten stick out is possible.

If you need to increase Tungsten stick out, to be able to see easily for example, but this increases the risk of poor gas shield integrity, it would be necessary to increase the gas flow to compensate.

Conclusion

The correct choice of Tungsten Tig Electrode is important and will affect the possible results of Tig Welding, as will the way a Tungsten is sharpened if being used for DC applications.

I hope you found this article useful.

Please let me know what you thought of this article by leaving a comment.  Don’t worry, your email address won’t be added to a database or shared and you won’t receive any unsolicited email.

Regards

Graham

The Welders Warehouse

Click Gold Tungsten Tig Electrodes to view our range.

Moreinfo on Tig generally can also be found in our Knowledge Zone

6 responses to “Tungsten Tig Electrodes”

  1. Paul Young says:

    As you are probably already aware, as all Tungstens are classed as heavy metals with varying types of coatings mixes etc do pose a H&S risk during the welding process. The worse one being “RED Thoriated” as Thorium is a Radio active Isotope. The tungsten will give off some of this thorium when being sharpened.

    • Graham says:

      Hi Paul
      Thanks for your comment. Yes we are are of the Radio Activity of Tungsten Electrodes, especially the Thoriated type. However, when this came into common knowledge, around 20 Years ago, we looked into it and were advised by a medical scientist that the level of radioacivity in the grinding dust was so low that a person would have to ingest or breath in at least 1/2 a bucket full of grinding dust for the radioactivity to build up to a dangerous level. Clearly if this much ingestion or breathing were to happen radioactivity is likely to be the least of the persons problem.
      But as you’ve raised the issue, I will add a note about wearing a mask when grinding Tungsten’s
      Cheers
      Graham

  2. RICHARD MOSS says:

    Brilliant Thanks, Very Helpful

  3. Robin says:

    Very useful, can you do something similar on what gas flow rate to use, what torch size to use.

    • Graham says:

      Hi Robin
      Thanks for your comment & suggestion. I have written an article regarding Gas Flow Rate for Mig, the formula in this would hold well for Tig as well. You can view the article Gas Flow Rate for Mig
      Torch size really comes down to personal preference, Power needed for the job and Torch Cooling system. Water Cooled Torches will be physically smaller than Air Cooled Torches and all torches have a max amperage rating. So if you need to weld at high amps and want a small(ish) torch, you will need Water Cooled, but if you only Tig Weld at low amps, you can get away with a small Air Cooled Torch. Vague answer I know, but there re a lot of variables 🙂
      Hope I’ve helped a bit!
      Cheers, Graham

Leave a Reply

Your email address will not be published. Required fields are marked *