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Hey guys,About to fire up the new MM251 but all I have is 100% Argon. I looked on Lincoln's and Miller's site for gas information (as well as other sites) and no-one really talks about migging with 100% Argon. I really don't want to schlep the tank down to my gas passer and swap it for a mix with CO2. The tank is full and that putz will probably charge me something just for swapping to a mix. Will the Argon work well with the MIG process or must it be mixed with CO2. It worked well with my TIG but not sure if there is enough difference in the process to cause concern. I plan on using a mix on the next tank but was hoping that I can expect decent welds with this bottle.ThanksMichael
Reply:Argon will work, but you loose penatration. Welds will be shallow. It depends on what you are welding. It would be OK for sheet metal, but not so hot for heavier stuff. I use PURE Co2 and .045 wire for the bigger stuff (3/4). It works great. Bare wire and Co2 are the cheapest way to weld. C25 makes the nicer looking welds. Less spatter. Co2 is globular transfer, the pieces of weld are bigger than the wire. C25 makes the pieces in transfer smaller.Hope I helped.Ya can't tig with C25.DavidReal world weldin. When I grow up I want to be a tig weldor.
Reply:He speaka' da' trutha'. John - fabricator extraordinaire, car nut!- bleeding Miller blue! http://www.weldfabzone.com
Reply:In theory it would not be too difficult to mix your own Ar/CO2. Get two decent flow meters and figure out the CFH for each gas to give you your 92%Ar/8%CO2. Run the two gases into a "Tee" or maybe a small chamber to mix throroughly, and on to the MIG. Have your TIG argon, plus any mix you want for MIG.Say you want to run around 40 cfh.Ar = 92% x 40 = 37 cfhCO2 = 8% x 40 = 3 cfhSo, here's the difficult part, where to get a flow meter (not too expensive) that reads accurately around 3 cfh.Just an idea.
Reply:92% Argon / 8% CO2 mix.... or 90/ 10 mix..... perform very well in short circuit, globular or spray transfer. Some gas companies offer a TRIMIX which is a custom blend that the supplier puts together. I typically run the above mentioned unless I'll be running strictly spray transfer.... then I'll use a 98/2 mix. This is for the solid wires._________________Chris
Reply:Good tips guys. Was getting ready to fill my bottle. So, lets say I would like to experiment with spray, but get the benefits of short circuit, would c10 be the gas?Various GrindersVictor Journeyman torch200cf Acet. 250cf oxygenLincoln 175 plus/alpha2 gunLincoln v205t tigLincoln 350mpEsab 650 plasmaWhen you can get up in the morning, Its a good day.Live each day like its your last.
Reply:As I recall, the max percent of CO2 for conventional true spray is said to be 15%. The latest wave form technology from the Lincoln Power Wave may have changed that limit, but that's pulsed spray.A good Short Arc mix is 75Ar/25CO2, some added heat, but not the harsh arc and spatter of 100% CO2. More CO2 = more heat (and spatter).A 10% CO2 mix would probably be a good compromize if you want to do both spray and short arc. Probably enough CO2 to add some heat and arc stability for short arc, not as hot as 25% CO2, but able to spray.
Reply:Originally Posted by Doolittle ... So, lets say I would like to experiment with spray ...
Reply:Off the top of my head , 0.023" wire with 98Ar/2O2 globular to spray transition current is about 135 amps.See the following, only lists 0.023" with 98/2.http://files.aws.org/wj/2006/02/wj20...j200602-46.pdf
Reply:Originally Posted by David RArgon will work, but you loose penatration. Welds will be shallow. It depends on what you are welding. It would be OK for sheet metal, but not so hot for heavier stuff. I use PURE Co2 and .045 wire for the bigger stuff (3/4). It works great. Bare wire and Co2 are the cheapest way to weld. C25 makes the nicer looking welds. Less spatter. Co2 is globular transfer, the pieces of weld are bigger than the wire. C25 makes the pieces in transfer smaller.Hope I helped.Ya can't tig with C25.David
Reply:(begin sarcasm ) but but but... he buys 'carbon offsets' so technically... he breaks even ( end sarcasm )
Reply:Sounds like I need to swap out the tank and get a 90/10 setup or even an 85/15 for a little more penetration. My argon tank is about 90% full and I know my gas passer is going to stick me somehow since he has a monopoly in this area. Oh well, it needs to be done. Thanks for all the info, I sort of new this was going to be the conclusion.Michael
Reply:if you will be doing ali then keep the argon and shell out the bread for a new bottle. i no it painful upfront, but you bought the argon for a reason.i run 75/25 in the mm251 at work, .035. most of my stuff is 3/8" or less. works well for me."Retreat hell, were just fighting in the other direction"Miller Trailblazer 302, Extreme 12 VS, Dimension 400, Spectrum 375, HF 251D-1, Milermatic 251 w/ spoolgun Hypertherm 1000Lincoln sp 1702000 F-450 to haul it
Reply:BackupRoller I sold the TIG unit and picked up the MIG in its place. My Tigging is decent but I'm not fast enough with it to take on my next big project. I'm building a steel fence around my yard and need to put together 72 - 8 foot panels to cover my yard. I think the MM251 will make that easier than tigging the whole thing. I helped my neighbor do his with his Lincoln 255 and it made pretty quick work of the project. We only made the fence around his pool but once we had the jig setup the welding went pretty fast.So I don't have the need for pure Argon anymore I just didn't want to have swap out unless I had to and it looks like that would be the best scenerio.Michael |
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发表于 2021-9-1 00:11:09