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Looking to know if anyone has tried this mix, 98%Argon/2% Oxygen for pulse mig with this welder. Using .035 ER70S-6 and the MDX 250 gun on mild steel. Looking for specific setting if you have them. I already have a small bottle of this that I bought to do spray on my MigMaster but never got around to it, so would like to use it if possible.Thanks in advance!
Reply:I have a 300CF bottle of 90/10 to start practicing with pulsed welding but haven't yet done it so I'd be interested in hearing of your experiences. Why don't you just start with the Auto-Set and make some changes from the base setting to see what your preferences are?Best regards,LanceMultimatic 255 w/MDX-250 EZ-Select gunHypertherm Powermax45 XPHeck Bevel Mill 4000Miller/Smith heavy duty torch set9" Evolution circular saw
Reply:I thought 98%argon/2% oxy was used more for stainless and low alloy steels? I did a quick search of the web and found some guys talking about using this gas on their 350P units and hating it for pulse. Oxygen is 10x more reactive than CO2. If no one comes back with a definitive answer I would hazard a guess to start with the WFS settings 1-2 sizes lower on the door chart and expect to have to experiment with the arc length. 98/2% oxy goes into spray mode at a lower voltage than 90/10.Miller Multimatic 255
Reply:I should add that I missed the 2% Oxygen. Thanks for the reminder Louie. What I have is 90% Argon, 10% CO2......It's pretty silly that the edit option is so short lived.LanceMultimatic 255 w/MDX-250 EZ-Select gunHypertherm Powermax45 XPHeck Bevel Mill 4000Miller/Smith heavy duty torch set9" Evolution circular saw
Reply:Actually what may be sillier is the use of oxygen in shielding gas.
The whole point of shielding gas is to keep oxygen out of the weld puddle. This isn't a dig at the OP, but I was reading some interesting stuff about the shenanigans of the gas industry in creating all these different gas mixes, mostly to boost their profits. You have to take this author with a very large grain of salt, but he does make some interesting points: https://weldreality.com/MIG_welding_gases.htm According to him (her now, he changed genders since writing this), 80/20 is the very best mix for all around MIG use on mild steel. BUT if you jump about 3/4ths of the way down the page, he says that 90/10 is the best mix for short circuit, spray and pulse on mild steel below 1/4 inch and is the best for multi pass welds on thicker materials so long as the mill scale is removed. SO by this logic, 90/10 is the perfect gas for something like the Millermatic/Multimatic 255Interesting reading to say the leastMiller Multimatic 255
Reply:I've read the same articles and agree that she likes to claim unerring omnipotence so I feel a bit of skepticism but after looking at other seemingly unbiased info I agree with her. I got the 90/10 with an eye to having something that would work well in spray, pulsed spray or short circuit as the vast majority of what I'll be welding will be 1/4" mild steel and thinner. The wood burning smokers that are the single biggest driving force behind my equipment upgrade use 1/4" steel pretty universally for the firebox, cooking chamber parts and many of the ancillary bits and pieces like hinges. It would not be unusual to have 30' of outside corners and another 20' of filet welds. And that's without a trailer and the other stuff that goes into a fair sized smoker.I will, at some point, fill the first bottle of 75/25 that I empty with 85/15 to see if there's a better mix of characteristics with that but I also wonder if, as a comparative MIG novice if I'll even appreciate any differences.Best regards to all,LanceLanceMultimatic 255 w/MDX-250 EZ-Select gunHypertherm Powermax45 XPHeck Bevel Mill 4000Miller/Smith heavy duty torch set9" Evolution circular saw
Reply:
Originally Posted by Louie1961
Actually what may be sillier is the use of oxygen in shielding gas.
The whole point of shielding gas is to keep oxygen out of the weld puddle.
Reply:Ed/Em really HATES oxygen in shielding gas,,I have tried to read his "hundred" page article on MIG shielding gas,,
(I wish there was a "Readers Digest" version of the article,,
just tell me what gas to use,,)https://weldreality.com/MIG_welding_gases.htmAnyways, Ed/Em says adding oxygen is simply a ploy for the gas suppliers to make more $$$$,,and the article,, I think,, says never use any percentage of oxygen.Also, I think I read ,, never use straight CO2,,and NEVER use 75-25CO2 ,, that mix has too much CO2,,If someone does not bore easily, maybe they can read the article, and,,,,,, tell us what gas to use where,,,,,,,,
Reply:OH,, yea,, I forgot to mention what Ed/Em thinks of pulsed welding,,about the same that he thinks of 75-25CO2 gas,,,I still want a pulsed welder,,
Reply:
Originally Posted by SweetMK
Ed/Em really HATES oxygen in shielding gas,,I have tried to read his "hundred" page article on MIG shielding gas,,
(I wish there was a "Readers Digest" version of the article,,
just tell me what gas to use,,)https://weldreality.com/MIG_welding_gases.htmAnyways, Ed/Em says adding oxygen is simply a ploy for the gas suppliers to make more $$$$,,and the article,, I think,, says never use any percentage of oxygen.Also, I think I read ,, never use straight CO2,,and NEVER use 75-25CO2 ,, that mix has too much CO2,,If someone does not bore easily, maybe they can read the article, and,,,,,, tell us what gas to use where,,,,,,,,
Reply:2% oxygen does not enter the weld pool but helps wetting it out by reducing the surface tension.Don't forget there's O2 in CO2.
Reply:
Originally Posted by Woznme
2% oxygen does not enter the weld pool but helps wetting it out by reducing the surface tension.Don't forget there's O2 in CO2.
Reply:
Originally Posted by Oscar
Beatcha to it.
Reply:
Originally Posted by tylerd
The gas is listed in the setup menu on the Millermatic bit under Stainless settings. 9.
Reply:
Originally Posted by Oscar
I bet you an $11 bill that it (the 98/2 Ar/O₂) is not the suggested gas for stainless, but instead it is 98/2 Ar/CO₂ mix. Call it a hunch.
Reply:
Originally Posted by Oscar
I bet you an $11 bill that it (the 98/2 Ar/O₂) is not the suggested gas for stainless, but instead it is 98/2 Ar/CO₂ mix. Call it a hunch.
Reply:My bad, I should have said for pulsed-spray stainless steel.
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Reply:You are correct! |
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发表于 2021-9-1 23:16:55