On 10 Dec 2024, at 17:27, DAVID WILLIAMS via groups.io <d.i.williams@...> wrote:

?

Dear Jeff,

Thank you again for another XLNT and very detailed description.

David Williams Nr. Oxford UK

On 10 Dec 2024, at 19:49, mike allen <animal@...> wrote:

?

??? John & Jeff , thanks for the extra explanation . I unfortunately never learned to TIG ( that was left for the teach & his stars back in the 70's ) & odds are pretty darn good that at this stage i probably won't , but I now have a better understanding of how this works .?

thanks again?

animal

?

On 12/10/24 5:50 AM, flyfishingdude9 via groups.io wrote:

Well said Buffalo John!

?

As stated, GTAW is no different than any other arc producing operation.? However, there is a feature that makes it standout from others - HF start.

?

There are three methods to starting a TIG weld: scratch, lift, and HF.?

?

Scratch - like old-time stick welding the tungsten is scratched on the work piece starting the arc.?

Lift - the tungsten is touched to the work piece, there is a surge in amperage starting the arc.?

HF (high frequency) - a brief (I have my machine set to 1 second) current is passed to the tungsten at a high frequency which initiates the arc.? This high frequency I believe is in the 180 - 250 khz range.? The tungsten does not come in contact with the work piece avoiding any contamination.? This burst of HF is what was messing with my shop.? Outside of the cross-spectrum interference that arc welding generates this little burst in RF makes the welder a little transmitter for a second.

?

Stick and MIG have no effect on my electronics, and since I have moved the TIG operation to the other side of the shop all is well.? Yes, the inverse square law applies. ?

?

Jeff