Tungsten: What’s the buzz?

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What’s the buzz about Tungsten? On the online welding bulletin boards over and over again I see questions having to do with tungsten electrodes for TIG/GTAW and Plasma Arc Welding:  What is rare earth tungsten?  Which tungsten is best?  What’s the difference between thoriated/ ceriated/ green/ blue/etc? Will “all purpose” tungsten really work for everything?  What about aluminum? Titanium?  Stainless steel?  Is thoriated tungsten really that dangerous?  Does the brand of tungsten matter?

Tungsten

At Arc-Zone we almost always recommend ArcTime™ Hybrid All-Purpose tungsten.  It is non radioactive and performs well on all machines and with all applications.  But sometimes the tungsten (color) selection comes down to personal preference, or it may be spec’d out—this is often the case in automated welding processes or when working in certain government facilities, or anywhere that repeatability is imperative.

You probably know that electrodes are color-coded, and if you buy from a trusted manufacturer or supplier you’ll find that the colors and nomenclature adhere to the AWS and ISO standards:

AWS Class            Color            Alloying Element

EWP                       Green               None

EWCe-2                  Gray               2% Cerium **

EWLa-1.5              Gold                1.5% Lanthanum

EWLa-2                  Blue                2% Lanthanum

EWTh-2                  Red                 2% Thorium

EWZr-1                  Brown             Zirconium

EWG                      Sky Blue           Unspecified Rare Earth Alloys

**note:  some manufacturers used to code the 2% Ceriated tungsten electrodes  Orange, but Gray is now the AWS/ISO standard

 

And, if you buy from a trusted supplier or manufacturer you’ll also be sure to get a better quality tungsten.  From how the tungsten is extruded from the earth to how the various oxides are added  in the manufacturing process make a big difference in terms of purity and grain structure which contribute to improved arc starting, better weld quality, and electrode longevity.

So in a nutshell, yes, brand does matter.

I know a lot of folks prefer to buy products made in the U.S.A.  With tungsten electrodes, unless you act fast, that is no longer possible.  First, there is no tungsten mining in the United States and at present, the largest producers of tungsten are China and Russia.  Second, GTP (formerly Sylvania) the lone U.S. manufacturer of tungsten electrodes has in effect pulled out of the tungsten electrode manufacturing business.  Whatever your supplier has left on the shelves is all there is. (Arc-Zone has some stock, so let us know asap if you want some).

It’s not all bad news, however.  There are some really great tungsten electrode options out there.  Weldcraft offers a line of premium tungsten electrodes (you can read more about the Weldcraft tungsten at JoeWelder.com), CK Worldwide, another leader in top-quality TIG/GTAW welding accessories offers their own brand of tungsten, and then there’s Arc-Zone’s popular ArcTime™ Hybrid One Tungsten for All (TIG and PAW), the Tri-Mix tungsten, and Multi-Strike, and the Ice-T™ Cryo Enhanced electrodes (for automated high production aplications).

And if all these new choices confuse you, be sure to check out these publications from the technical experts at Arc-Zone.com:

What’s the Difference:  Tungsten Electrodes, by Jim Watson explains the differences you’ll see between a quality tungsten electrode manufacturer and a substandard cheap import.

Guide to Tungsten Electrode Selection (.pdf), covers determining the best tungsten alloy for your welding application, selecting the proper size electrode, and guide to tungsten grinders.

Tungsten Electrodes: an Arc-Zone.com® Technical Focus Paper (.pdf) covers information on the history of tungsten mining, the properties of the various alloys, and tips for prepping the electrode for welding.

American Welding Society Safety and Health Fact Sheet on thoriated tungsten electrodes (.pdf)

Tungsten Image Credit: www.balticnordic.com

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