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I currently have one Powermig 255 from Lincoln and I'm fairly happy with it, had it about 4 years now. Anyone have a chance to directly compare the powermig 255 vs the milleratic 252in there shops? I'm not fan of anyone brand, I'm thinking of just sticking with Lincoln so that I can carry just one set of consumables. I currently run hardwire, metal core, fluxcore and use a push pull gun with the Lincoln for aluminum. It works well, but I have used older Hobarts which I found had a better "sweet spot" when doing short arc. Any feed back would be appreciated. I would particularly like to hear from people who have used both machines.ThanksER70S-2
Reply:You really use ER70S-2 as MIG wire? Why do you prefer it over ER 70S-3 and/or ER 70S-6? Which gas mixture do you use with ER 70S-2?
Reply:LOL, no I don't, ER70S-2 is my user name. I generally use an ER70S-6 for most of my mig applications. For spray transfer I prefer a 95/5 argon/oxygen mixed gas for mild steel and for short arc I normally use a 75/25 argon co2 where penetration is of a concern.RegardsER70S-2
Reply:Thanks for answer.But another question: Why do you use 95/5 Ar/O2 mix? Isn't it too oxidizing gas? With 255 machine you have enough power to use common 92/8 Ar/CO2 mixture for spray, without oxidizing weld metal.Last edited by stiv9; 07-30-2008 at 12:49 PM.
Reply:You would think that it would oxidize the welds but it does not, this is a very common gas for pressure vessels.The 92/8 (co2) will give you better penetration, but will not run as "smooth" as a 95/5 (oxygen). As well the cap on the 95/5 (oxygen) will lay flatter then the 92/8 (co2). When I'm saying smooth I mean in the spray transfer mode. For this particular production job I'm working on now I'm using an 0.035" ER70S-6 Lincoln hard wire with the 95/5 (oxygen) gas. I'm using 24.6 volts and 465 IPM of wire. I get a beautiful spray transfer on this. This leaves a nice low cap with no spatter. When I use the 92/8 (co2) on the same job I can get a spray transfer but it's hard to tune it down low enough (heat) while maintaining a true spray transfer without popping and creating spatter. I've attached a jpeg of what I'm doing, it's a shaft with a locating pin. The pin is about 1/2" in diameter and the OD is 1.5". It takes a root, 2 filler passes and now I use a single weaved capping pass, but I turn the wire down to 410 and volts to 24.0 for the cap as it is quite hot at this point. I wire wheel between each pass. These joints are x-rayed and must have complete fusion and little porosity is allowed. I use a rotator to turn the part. It's important for me to be able to get a low cap as these welds will be dressed flush, the lower the cap the less grinding will be required later, and that is the reason for the 95/5.Hope this explains everything and thanks for your interest.regardsThere is no Pulse being used either, it was initially set up as pulse on a different machine but I could weld the part faster with less rejects without the use of pulse, this was an early rendition of the WP Attached ImagesLast edited by ER70s-2; 07-30-2008 at 02:44 PM.Reason: Explanation of Pulse
Reply:Thanks for reply!!! And drawings!Indeed, I have never tried 92%-Ar/5%-O2, but am just scared with telltales... Next time I will buy 98-2 (Ar-O2) and give it try. (Sorry, 95-5 is still sounds awesome to me).
Reply:There's nothing wrong with the 92/8 with CO2, if it works well for you then I would stick with it. If you change to the 95/5 with oxygen you will have to re-certify your weld procedure (if you are using one) or at the very least you will need to adjust your wire speed and voltage a bit.If you ever have a chance to run the two gases side by side on spray transfer give it a shot, at the very least it's interesting to see the affect of the different gases. What wire are you using? On this current production job I go through about 90lbs of wire a week. I tried the offshore Chinese wire and wasn't impressed. To get it to go into a semi decent spray transfer without popping I had to adjust the voltage up to 26 and the wire speed down to 440. With the Lincoln wire I can run it at 24.6 volts and 465 wire and it's smooth as silk..........and I do not have any affiliation with Lincoln, just thought it was interesting that there is such a difference between two spools of wire that are supposed to be the same grade.RegardsER70S-2
Reply:i'd like to hear someone chime in on the original question myself. I talked to a shop teacher one time that did a comparison between the 255 and 251 with the 255 being the better smoother machine, plus he said the wire drive was much better set up on the 255 and had less trouble with feeding.252 vs. 255 sounds like a good question.
Reply:I would still like to hear as well, although I did already pick up another 255 on Friday, runs good and either then the new hook up for the spool gun is identical to my old one.Er70S-2
Reply:i'll kick it up one more time. I would think such will so much talk of Lincoln vs. Miller these two machines would surely be tested already. |
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发表于 2021-9-1 00:50:31