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Purple tip Tungsten ?

WaterH

Red Skull Member
Joined
May 20, 2020
Member Number
602
Messages
1,227
Location
North Florida
So I finally went and bought a new tig torch and hose. (My old one was in bad shape) Anyways, inside the box was a free sample Tungsten. It's got a purple tip. The pamphlet with it says it can weld AC or DC. I know there's all kinds of color codes for differnt stuff, but I've only ever used red for steel or green for aluminum. Has anybody used the purple? Im not sure if this is right, but I've only used AC for aluminum. So when they say AC or DC, does that mean you can weld aluminum or steel with the same tungsten? That would be nice.
 

bdkw1

Well-known member
Joined
May 19, 2020
Member Number
354
Messages
624
Yup, gold and purple can weld both. It's nice not having to swap out all the time. Purple will also hold a point on AC making for some finer welds.
 

tracyb

l knows nuffin
Joined
May 21, 2020
Member Number
907
Messages
346
Location
San Juan Islands
i use blue, 2% lanth, for everything.

when i used a syncro 250 transformer machine i used green/ red. but when i got the dynasty i went to blue only
 

gt1guy

Don't touch me there
Joined
May 19, 2020
Member Number
241
Messages
1,069
Location
New Iberia, La.
i use blue, 2% lanth, for everything.

when i used a syncro 250 transformer machine i used green/ red. but when i got the dynasty i went to blue only

This post on the Miller site explains why the green isn't a good choice on inverter machines.


TIG arc depends on ionized gas to carry an arc. Sine wave 60 HZ AC the tapering to a zero current, then reestablishing a new one gives sufficient time to lose ionization. HF overrunning current maintains ionization, but still the return "stroke" is hampered by the oxides, and contamination on the larger surface of the workpiece. This work negative stroke brings with it lots of heat. Sine wave machines, even at 50% balance don't heat the tungsten as much.

Square wave machines are more effective at establishing the return stroke. They bring lots of heat with it. Pure tungsten won't resist heat well enough, it melts into too large a ball. I like nearly any tungsten for AC except pure. I use as large a tungsten as possible, and grind very blunt, let it round nose a bit. Set balance as high as you can make work. Most sharp tungsten work for DC
 
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