Hi Hans,
It's close but not the same. I'm not sure if the pullup resistor (10k) is needed or not.
The foot control position wiring is the same. If it works in MMA then it should work for TIG.
Are you able to measure the voltage across the switch when the pedal is not pressed ?
(should be...
is it possible there was a draught where you are working? - I've had that happen and it looked exactly like you describe, and was worse with a big pyrex gas lens. I've also had contamination pulled into the weld from the back side, but doesn't really look like you describe.
Finally, an update, been "busy".
Getting there. Used a LOT of gas, and maybe learnt a few things.
6261 ally is not the same as 6061.
When you think the arc is short enough, it needs to be shorter.
The image of the weld face on looks undercut. It isn't. The etching process got left in...
12 LPM on a size 7 gas lens.
Higher frequencies - say 250Hz, and square-ish waveform seems to tighten the arc and give more penetration. The noise however drives me up the wall.
120 Hz seemed a happy medium. I will try lower.
No. Some of the test jig frames would be awkward to preheat. I'm starting to wonder if it's just bad practice, I'm creating two puddles and bridging them, rather than dissolving filler into one puddle.
For some time I have noticed I'm not getting full penetration on aluminum tube.
The settings;
200+Amps AC, 25% Cleaning (or 75, Kempii is backward here), 120Hz rounded squarewave.
12 LPM Argon, electrode 2% lanthanated 2.4mm. Filler Rod 4043, cleaned of course.
Aluminum is 6261 - slightly...
I'm guessing here, but if it can handle oil at 250 Bar, then water/glycol at perhaps 6 should be OK. I will be in a position to find out the hard way after Xmas.
Having just purchased a cooler for the Kempii.... Sigh. Would have been so much smoother and quieter. The Kempii uses a pump borrowed from a concrete breaker.
I have been using these pumps for a pressure test rig. They are Hydraulic Gear pumps, but work well with water (so assume they...
Further up this thread there was a comment about Brake Cleaner. It can be very dangerous to use for Tig because of the argon. One local welder managed to make himself very ill, told me he felt like he was swallowing marbles...
I would suspect two things, first the oxy-acetylene is leaving carbon on the surface, perhaps wire brush with stainless brush while hot. The tungsten problem is usually post flow time, needs to be 6-9 seconds.
Having said that, 10mm aluminium is hard, 20mm very hard.
Are you using a gas...
http://www.knighton-tools.co.uk/acatalog/DRILL_GRINDING_ATTACHMENT.html Might check how fine it is.
http://www.cutwel.co.uk/Grinding-Wheel-for-Drill-Sharpening-Machine-Wolfram-Steel...
The ones I can get in NZ have very few diamonds embedded, they make a very rough electrode. The thin ones like are used in dremel type sharpeners are fairly rough. I'm ending up with electrodes that look like glass. This is the third grinder I've made, and by far the best.
Of course it...
This is the diamond wheel, well actually CBN. The diamonds are on the back for a few mm as well. The wheel is so smooth that you can touch it with no skin lost. The alignment turned out to be perfect, no shims or eccentric washers. I use the 45 deg face against the rest to get the basic shape...
I got one of these "wheels" a while back, industrial diamond, mounts on a standard Makita bench grinder. Couldn't do a better job. I took the end cover off the grinder. It fitted on the shaft with no adapter.
http://images.ffx.co.uk/tools/SMS2008.10.jpg