v8kid
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| posted on 11/4/06 at 01:04 PM |
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TIG from MIG
I may be missing something here but why can't we disconnect the wire feed, screw in a tungstone tip and happily use our MIG welders to TIG -
only on steel, and only scratch start but for the occasional TIG welding why not?
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Peteff
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| posted on 11/4/06 at 03:15 PM |
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Yes why not?
Let me know how you get on.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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GeoffT
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| posted on 11/4/06 at 03:21 PM |
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I've tried it - even with the lowest current and pure argon it almost instantly burnt away the tungsten. Came to the conclusion that the
polarity and waveform were probably all wrong for TIG and gave up. If you could come up with a way of making it work tho' I'm sure
there'd be a lot of people wanting to try it.....
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02GF74
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| posted on 11/4/06 at 03:33 PM |
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I thought that MIG was DC, if you want to up the power you up voltage/current whereas TIG is a square waveforem; to up power you increase the
mark/space ratio.
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dmottaway
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| posted on 11/4/06 at 03:44 PM |
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I thought one was constant voltage while the other constant current. don't which way, tho.
dave
Somewhere, in Texas, a village is missing its idiot.
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v8kid
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| posted on 11/4/06 at 04:00 PM |
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Rats thought it would be too good to be true
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Peteff
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| posted on 11/4/06 at 05:08 PM |
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Me too.
 . I think it would be documented somewhere if it would work. If you forget to turn the wire speed on just see how quick the wire burns back, your
tungsten is going to do the same. Combined Units that do mig and tig like the Miller machines are very expensive, probably for a reason.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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JohnN
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| posted on 11/4/06 at 05:43 PM |
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Don't forget if it is DC, then for TIG welding the ground should be +ve and the torch -ve, or you will burn away the tungsten.
[Edited on 11/4/06 by JohnN]
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daytonadean
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| posted on 11/4/06 at 07:12 PM |
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mig & tig
right..
mig and dc tig are both dc- direct current
mig has a nominal voltage of 35 volts dc - tig has a nominal voltage of 80 volts dc.
mig is negative earth and tig is positive earth.
the big thing is the voltage tig requires a higher voltage as the arc has to be maintained across an open arc shielded by argon. that is why you cant
tig with a mig power source.
pps you can stick weld with a mig..
hope this is clear
dean
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