What owners do with it
How it is used20 owners said
Paid work70%
Hobby and home30%
Process used19 owners said
MIG with gas47%
Aluminum37%
Flux core11%
TIG5%
Specs
What it does
- Plugs into
- 240V
- Amperage
- 20-350A
- Duty cycle
- 230A at 60%
The machine
- Weight
- 84 lb
- Warranty
- 3 years 3 years parts and labor; MIG gun 90 days.
Prices
44 owner reviews
@BuzzkillcoI believe you. You are influenced by your experience just as I am with mine. I guess we have different luck. I had a Miller DVI burn the transformer after about 2 years light industrial use. Mostly welding steel 14 & 16 ga. I know it is somewhat a smaller rated machine. But its an air cooled transformer machine. No air cooled inverter machine of mine has failed in 3 years of owning them. They shut off if the get hot and dont burn out. I have even been using the miller 255 for 1/2"& 5/8" welding because I like how it spray welds and is more portable, better then the miller 450. Also I found with portable welding that certain inverter machines are much better to use, lighter, more efficient, and more forgiving on dirty voltage. " when properly equipped with voltage correction " I did learn they will break from a fall, so now I try to treat them as if they were lazer levels by protecting them from drops and bad vibrations . Probably my day is coming for a smoked board but as of yet I have never smoked one from overload or overheating as the thermal protection has always worked, so far. Edit, I should add for anyone reading this that doesn't know or is not educated yet on the matter, an inverter welder running on generator current should be purchased with that in mind. As they make specific models just for that condition with voltage correction. Probably most are not intended for that and will burn out. Also people trying to run 140 amps on 110V are asking for trouble as well. That was not what I am doing with my experience. I am running 220v 1ph or 440v 3ph I also understand how induction works and have wound coils. I was only talking specifically about the duty cycle ratings being very important even if it is a transformer welder and the heat and thermal protections or lack thereof causing welding machine failure.
I first bought one to use the AlumaPro gun and 25` lead. I liked it so much I bought a second 255 machine so I could have one for metal fab and one for aluminum fab. I just wish there was a 25` lead for metal work without possibly building my own. I had a Miller200 wire welder I bought new over 40 years ago. I sold it for $100 more than it sold for new way back then! Millers are great tools!
Having welded with miller 255(better welder) you shouldn’t have to constantly check you gas pressure. I can’t keep my home welder(titanium 140) at a constant gas pressure.
@xade7@xade7863 Gas I am not a fan of many, may of been something when it was freighted or bad assembly idk man , bummer though , mines smooth so far and been good to me. It takes a while to even get the cooling fan on when I am running higher duty , I get scared I’m gonna kill it but it will kick on just as I a like damn I’ve been burning wire for a good few minutes straight here !
@Equit@EquitySolutionRayRazught mine when they first came out and was never right called miller and they told me I didn’t know how to weld I bought it from air gas and they wouldn’t do anything and multiple people tried it not just me and hated it and I sold it to a welding shop and the guy I sold it to said it was junk I took it to air gas and they tried to weld and it might would do one pass and be perfect and move 2-3 inches down the same piece of metal and start to welding and voltage would go crazy had wire stop feeding midway welding nobody could ever figure that out and nobody would give me a different welder and couldn’t get mine fixed and I had a neighbor that bought one only difference with his is mine had the Bernard gun with the special tips his was the normal miller gun and it would do the same thing now airgas did take his back and he bought a 256 Lincoln and loved it
@xade7863really ! I have had no issues with my 255 , I like it , i made a gas fireplace that hangs from ceiling for a client as a first project but from handicap ramp to 1/2” thick beam brackets , I also have spoolgun setup which worked awesome for some dock stuff I built , my only issue is spool gun was more of a manufacturing unit and you have to move fast as hell on aluminum but other then that it’s been awesome to me . Idk I do a lot of different things and it’s perfect for that , The 251 was great that’s what influenced me to buying the 255 .
Idk what you went with but we had a 251 loved it but the front got broke and needed some stuff and was wore out replaced it with a 255 hated it from the start voltage was everywhere and no consistency sold it and bought a 252 and it’s a whole lot better welder than the 255 or 251
I completely understand. I have a ton of experience with the 252 and I love it. Same situation with me the 255 is way newer and the salesman push the 255 as the 252 is now old technology. Im currently loving the 255 and I do think it is built well. I also need this welder to last me well into the future and I believe it will. I should do another update on this since I have a little more hood time with it.
Being in this industry for nearly 35 years I still believe in Miller for shop work and Lincoln for field work. I have several multi process machines and a dedicated AC tig. Pulse option on most of them. My son just decided the same and asked what machine to get. I recommended the Miller 255 Multimatic. Hands down one of the most versatile and consistent mid level machines I've used in the past 5-6 years. If he will be using this machine daily for 5-6 hours a day... buy as much machine as you can. His pocket book and piece of mind will thank him later on. Also upgrade to the Bernard 300 (400) mig gun, be much happier using it that the cheesy Miller factory equipped gun it comes with. Just a few in my main fabshop and have a few more scattered throughout my shops as well.
In 2010 I think these things were crap. Cheap inverter yet powerful inverters have made these not suck completely. That said, you’re maxing out the machine to do what you are right now and that’s going to take its toll on longevity sooner or later. We used to have 2 Lincoln ~140A MIG machines at my makerspace and we absolutely smoked them. Now we have a Millermatic 255 and that doesn’t need constant maintenance to keep running. That isn’t a dig at Lincoln, just we were pushing a “hobbyist” machine too far. The 255 is just so much more capable it doesn’t even run its fan most of the time.
I have the same millermatic 255. I love it! I particularly like it with aluminum pulse with the 30a spoolgun.
It’s nice for a welder for someone who doesn’t really know what they are doing with the settings. I use it everyday and would still prefer a miller delta weld due to the fact you can toggle trigger hold so you don’t have to sit there and hold trigger all day long while your welding like You have to do with these 255s
I have had my 255 for just over a year. I love it for the most part. I just upgraded the software, and it seems to be working great. I was having issues with burnback using dual sheild .045 wire. I haven't tried the dual sheild again since I updated the software. We will see.
The 255 can take a range of voltage. 208-480+. They recommend 240. Single phase only. So if u have a 3 phase hook up, it be A phase white, B phar black, green ground. I've run it on all voltages.
@fleetwood9142 of course, I would make sure your local supplier would handle Warranty work. But of the three machines I use there hasn’t been anything come up
@fleetwood9142 I have mine personally at my shop for more than 2 years, and 3 years for one at my day job. Both get ran hard and honestly I haven’t had a single issue
No suben yo la tengo lammillermatic 255 y no sube la alimentación de alambre siempre hase contacto antes de llegar al material que se va a soldar basura
It’s a great machine , got one from you guys couple weeks ago , things awesome and the 30A spool worked great for what we needed to do with aluminum.
I've had mine for about a year and a half, it welds great with one real gripe I have. I have had a hell of a time trying to get .023 br/si or .023 ER70-S6 to feed properly, in fact I simply gave up on trying, it's bird nest city. If there is a way to control the overrun I would like to know about it. It runs AL wire perfectly through the push-pull gun. All of my equipment and 6g extension cables, I use common plugs/receptacles to match the 240v outlet on my trailblazer. I have used my 255 off the trailblazer, and as long as you run the TB at full, it welds like it is connected to regular shop power. It's not precisely portable, but it can be moved around as needed.
I am with you on that one. Used to be Miller all the way till they started raising prices and lowering quality Now they produce overpriced junk. I just got a no name brand Chinese Tig 350 3 phase delivered to my house for $800. No noisy fan, pulse etc.. Welds like a dream. F Miller.
Thank you. I’m still in love with my machine. If you look at a couple of my new videos you will see it in action,
We bought a Dynasty 280 & cooler for our Makerspace maybe 5 years ago. We recently bought the millermatic 255 with push pull gun. It has that color screen. I personally dont care for the screens, maybe that will change. Also I swear my Lincoln 3350 is pretty damn close to that. I’d have trouble with the finger control as well.
I have two of these machines and have put them through hell. They are expensive but sometimes you get what you pay for. They are great machines. One simple thing that pisses me off about Miller, give us a longer ground lead. And also recommend switching consumables on gun to Bernard centerfire.
I had this welder for over 3 years. Also have spool gun. I had no issues and think it’s a great welder for hobbyist. I ran maybe 50lbs of wire and 20lbs of rods. I also have a Miller 255 which is about 5x more expensive. Just sayin I think the 220 welds as good as my 255 it’s just not as robust feeling. I wouldn’t run dual shield through it but short circuit mig I have no complaints.
I second this, I'll trust it on anything under a 5/8s, I did some 3 in channel with 35 wire and it penetrated as good as my work millermatic 255 running at 20.5v but I wasn't even maxing out the titanium.a
You don’t have to use the pulse function or pre-sets. You can definitely manually dial in your settings, and then save them. I never thought I would own a machine that used a USB port for firmware updates and diagnostics. But that’s where we are haha
It didn't hurt it, machine doesn't see heavy use in my personal shop, so I can't say if it helped or not. I do recommend swapping a clamp for a better quality.
@ray-real1 I’m sure more often than not, you hear about the bad things a machine does vs the good. I have had good luck but that doesn’t mean everyone else will. I need to figure out a camera setup so I can actually film welding it it
I have probably 6-8 spools through my 255 at work, and my 255 at home. I haven’t had that issue. Did they check the tension of the roll itself? I make sure the spool is just tight enough it so it turns easy.
Running production shop and we use these machines, never hit the duty cycle. One problem is ground clamps and wire get too hot especially on pulse. I have Multimatic 255 in my personal shop and I have upsize all lead wires including the short one that goes to drive rolls and swapped for a full on brass clamp.
@ray-real1 I did get it, I love that machine, haven’t had any issues with it and it’s easily handled everything I’ve thrown at it. 👍 I actually did end up getting a watercooled everlast 250 ac/dc tig welder last year as well, it’s been great too.
I have been using a MM255 pulsed with the AlumaPro PushPull gun for about a year now and love it!!
@blessingslawn what issues are you having. I have one as well and no matter the settings, new liner, straight cable it has an inconsistent arc.
Having issues with mine
I love this Welder!! I am super happy with it. I alway enjoy working with good quality tools even if there is a cheeper option that would probably do the same thing
That’s not good at all. I have had my unit at work for going on two years and never had an issue. Hopefully they get it sorted out for you
Mine had electronic issue out of the box. 5 month later and a failed repair from Miller, I still have it and Miller haven't replaced it yet. Worst investment of my life.
I have the Multimatic 255. Same machine except can stick and DC Tig as well. Both 255s have a 60% duty cycle maxed out. You’ll never hit the duty cycle. Mine replaced my Lincoln 180 after I burned it up making fence panels for a customer. The difference is night and day and I run it on pulse 90% of the time when using the mig process. The stick runs so good I can barely notice the difference between it and my Miller Trailblazer engine drive which is the finest stick welder I’ve personally used. Sure there are Miller 400s and SA 300s and all. I hear they are amazing. Never touched one. For my type of work and needing more generator power to run plasma cutters and electric air compressors at the same time as I’m welding, the Trailblazer cannot be beat IMHO.
Thank you for mentioning that it’s basically the baby brother to the 350p. When I ordered mine my local dealer didn’t believe me that it’s capable of 300amps. I basically only use pulse for anything that comes in my shop. And I have the push pull gun and runs like a dream.
Very similar on my multimatic 255. Either set the material thickness (synergic) or set the WFS from the door chart and manually adjust (435 IPM). Voltage and pulse frequency are set automatically, with an option to control arc length and arc control (width of the arc cone...I suspect it is an inductance setting). The MM255 is super easy to use on pulse MIG. It also does a super nice job of short circuit MIG using the same C-10 gas.
Thanks! We love this machine. Might be our favorite MIG machine.
We just purchased the 255 and we run 5356 .035 aluminum wire through the stock gun and it's never a bird nested once.
I bought a miller 255 and I love it. Push pull gun might be my next purchase
@BakersGas I got the 255 set up with an xr alumapro, for the money it is an awesome welding machine but not quit up to par with the 350 mpa, it has a lapping problem at higher wfs, I've dialed it down to the run in but it has to be changed for every heat leap( from 20 to 30), it would be superb to have a hot start, though the start is extremely smooth (even compared to 350 mpa) it lacks heat for clean starts. One more thing is that it is not compatible with the XR 30a push pull guns, which I was hoping it would be because I have two the I dont use. But all in all, it is light years away from the 250s and 252s as far as aluminum capabilities go and as soon as we get this one dialed in we will be purchasing more
Review videos
One Year Review of Millermatic 255?Sep 15, 2021 · YouTube ↗
Millermatic 255 907734 Review + Pulse MIG OverviewMay 7, 2024 · YouTube ↗
Millermatic 255 vs Multimatic 255 Review and ComparisonDec 6, 2023 · YouTube ↗
Millermatic 255 Review and UnboxingDec 1, 2018 · YouTube ↗
Millermatic 255 Review: Short Circuit CapabilitiesFeb 27, 2019 · YouTube ↗
Multimatic 255 Review 907728 - Watch before you buy a Miller 255Dec 5, 2023 · YouTube ↗
