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I had about 7 feet of fillet welds on 5/16" steel to do today. I used my new-to-me Lincoln Powermig 255. I was able to finish the welds in very little time and the machine did not break a sweat. On my old Hobart 187, I would have had to stop several times to let the machine cool. I love these high duty cycles!Lincoln Powermig 255Hypertherm Powermax 45Thermal Arc 161SOxweld 24R OA TorchStill Looking for an Old Round Top Idealarc 250
Reply:I think the same thing when I use my mm252Millermatic 252millermatic 175miller 300 Thunderboltlincoln ranger 250smith torcheslots of bfh'sIf it dont fit get a bigger hammer
Reply:That is interesting as my old hobart mig is rated at 100%. That was what really impressed me when i bought. Joe
Reply:My Hobart 187 was rated at about 20% duty cycle for the amperage I was using yesterday, whereas my Lincoln was at about 80% duty cycle for the same amperage.Lincoln Powermig 255Hypertherm Powermax 45Thermal Arc 161SOxweld 24R OA TorchStill Looking for an Old Round Top Idealarc 250
Reply:For the first 25 years of my welding life I used only 100% machines. So the first time I had a machine shut down due to heat I really thought I had just bought a machine.
Reply:Proof bigger is better. Good quality machines are under rated. Look at my V155-S or TA-185. Both work far past the rated duty cycle.Real world weldin. When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RProof bigger is better. Good quality machines are under rated. Look at my V155-S or TA-185. Both work far past the rated duty cycle.
Reply:My cheesy Chicago Electric Dual Mig 131 quits after 3" of bead. My Millermatic 200 can weld a foot of bead before the fan comes on!TA Arcmaster 300CM3XMT 304S22P12 suitcase feederX-Treme 12VSOptima pulserTA161SMaxstar 150STLHypertherm PM45OP setupStihl 020AVP, 039, 066 Magnum
Reply:I have seen people mention installing a more powerful fan, to help increase the duty cycle. This is especially in reference to something like Harbor Freight offerings. Does that seem to actually help? I could anticipate a scenario where you could go longer before it shuts down, but you might still actually cause damage. There is presumably a temperature sensor mounted to the transformer, or whatever the temperature-sensitive item is. If that sensor happens to be right in front of the fan, or you add a 2nd fan that happens to blow on it, the sensor might be getting more cooling than the rest of the transformer. The sensor could be reading, say, 200F, while the transformer is really at 230F, past the shutdown temperature of 210F (all hypothetical #'s). Now, if the sensor is buried inside the transformer, and reads "conservatively" (reads higher than the transformer's real temperature), then that's a different story. If the sensor is still happy, then go for it. The manufacturers would probably like to list better duty cycles as well. If that just meant spending $6 on a fan, vs $4, to go from 20% to 30%, I'd assume they might go for that. So I'm guessing that either a better fan doesn't really protect you. Or maybe they simply wanted to keep the noise/cost down. Thoughts? And machines that can go 100% duty cycle must be pretty nice But for hobbyist-type purposes, they aren't as practical, unfortunately. I just have a little Home Depot Lincoln 110V MIG, 140A. I haven't gotten to put its rated duty cycle to the test.
Reply:Originally Posted by RedOctobyrI have seen people mention installing a more powerful fan, to help increase the duty cycle. This is especially in reference to something like Harbor Freight offerings. Does that seem to actually help? I could anticipate a scenario where you could go longer before it shuts down, but you might still actually cause damage. There is presumably a temperature sensor mounted to the transformer, or whatever the temperature-sensitive item is. If that sensor happens to be right in front of the fan, or you add a 2nd fan that happens to blow on it, the sensor might be getting more cooling than the rest of the transformer. The sensor could be reading, say, 200F, while the transformer is really at 230F, past the shutdown temperature of 210F (all hypothetical #'s). Now, if the sensor is buried inside the transformer, and reads "conservatively" (reads higher than the transformer's real temperature), then that's a different story. If the sensor is still happy, then go for it. The manufacturers would probably like to list better duty cycles as well. If that just meant spending $6 on a fan, vs $4, to go from 20% to 30%, I'd assume they might go for that. So I'm guessing that either a better fan doesn't really protect you. Or maybe they simply wanted to keep the noise/cost down. Thoughts? And machines that can go 100% duty cycle must be pretty nice But for hobbyist-type purposes, they aren't as practical, unfortunately. I just have a little Home Depot Lincoln 110V MIG, 140A. I haven't gotten to put its rated duty cycle to the test.
Reply:Haven't hit any duty cycle limits on my Invertig 221 either. I havehit my hand-to-heat limit real good once on my new machine. Notfun, but kinda funny as I flung my glove off and dunked my hand into a bucket of water while letting some creative expletives fly .It would've been better if the water was clean. It's an air cooled tig though.How do you know the blacksmith's dog? When you hollar at him he makes a bolt for the door!
Reply:Most engine drive welders are rated at 100%.Real world weldin. When I grow up I want to be a tig weldor.
Reply:I assume you are all talking about max amps at 100%? Biggest welder at work is a miller 812, 100% at 650A
Reply:I used the plasma to cut a hole in the top for the blower.http://weldingweb.com/attachment.php...3&d=1321825365Ranger 250. 100% duty cycle at 250 amps. It will put out 300 running flux core wire.My Invertec V350 pro 100% duty cycle @ 350 amps. It will put out 425 amps @ 60%. duty cycle. I will never see that. If you read the review of my V155-S, 100 amps 100% duty cycle. We ran it at 140 amps for just under 15 minutes. No problems not even a hot light. The same goes for my Passport. It does more than it says.I found it. I put a furnace blower on my OLD linde plasma beause I was using the heck out of it and it overheated. It never over heated again. It had NO fan to start, just big azzed transformers. http://weldingweb.com/vbb/showthread.php?t=62852Last edited by David R; 03-12-2012 at 08:11 PM.Real world weldin. When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RI put a furnace blower on my .....
Reply:Dave, That is the most redneck thing Ive ever seen ANYONE do to a welder... And I like it [Account Abandoned 8/8/16 Please Do Not Attempt Contact Or Expect A Reply]. See you on YouTube! -ChuckE2009
Reply:definitely what he said! ^^^ Matt |
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发表于 2021-8-31 23:16:20