Hey everyone, I'm the new kid on the block here. I often weld outdoors in all kinds of temperatures, but I have been told duty cycles are measured at 104 ºF. Anyone know how this changes at say, 30 ºF? I have welded continuously (as in, held an arc continuously) for nearly a minute at ~170 A and never seen the temperature gauge on the machine move off of "cold".

I've heard a rumor that the max internal temp on these machines is typically 250 ºF. So if it takes 2 min at 104 ºF ambient to reach this, it should take 2x220/146 or about 3 minutes to reach 250 ºF with 30ºF ambient temp. (This is neglecting the change in specific heat of air with temperature)

So based on rumors and back-of-the-envelope figures, I should have a 30% duty cycle welding at 30ºF. But The temp gauge still reads cold after a minute or so of arc time, which makes me question my calculations. Do any of the Miller people here know more than I?

Thanks

P.S. I'm using a Multimatic 215

I've heard a rumor that the max internal temp on these machines is typically 250 ºF. So if it takes 2 min at 104 ºF ambient to reach this, it should take 2x220/146 or about 3 minutes to reach 250 ºF with 30ºF ambient temp. (This is neglecting the change in specific heat of air with temperature)

So based on rumors and back-of-the-envelope figures, I should have a 30% duty cycle welding at 30ºF. But The temp gauge still reads cold after a minute or so of arc time, which makes me question my calculations. Do any of the Miller people here know more than I?

Thanks

P.S. I'm using a Multimatic 215

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