[mpete53]

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Holding small pieces at odd angles has always been a problem for me. I am have made a proof of concept magnetic fitting for a magnetic dial indicator holder. While the one I made was on a 3D printer is very heat sensitive it does work. Just some food for thought one of you may find a better way to do it.

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[cj737]

Depending upon the strength of the magnet (and its proximity to the weld) it can aggravate a TIG arc in my experience. Might not be such a problem for a quick tack though.

[tweake]

i usually use the strong hand magtabs.

[mpete53]

I have the stronghand magtabs and the work fine most of the time, but this is gust another option.

[BillE.Dee]

As Cj stated, magnets interfere with tig welding and I've had magnets interfere with mig welding. When I need extra hands, I use a "third hand" that I put together using a connecting rod from Caterpillar engine and pieces of 1/4 inch round stock. Nothing fancy but gives me that extra support.

[Coldman]

Magnets do interfere with the arc but it's kinda fun to drag the arc back to where you need to tack.

[metalmagpie]

I can usually hold it "pretty close" and get 1 small tack on it, then adjust from there. It's pretty easy to bend one small MIG tack.

[Timmy_Tiggs]

That looks like a good solution. For me, the hardest thing is clamping something that is curved. Clamps want to slide off.
I had to make a jig for this job: