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Old 08-19-2012, 07:58 AM
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What kind of welding gas?

Hey guys,

I'm going to be doing some body panel welding soon and need a recommendation on which MIG gas to use. I have a MIG welder but so far have just used flux core wire which I understand is not desirable for body panels. What are your thoughts?

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Old 08-19-2012, 08:20 AM
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This is from..

Another site . It is not from my experience right now, but something I will be doing soon.

Let me know how it works out.
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Old 08-19-2012, 08:31 AM
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75/25 Argon/Carbon Dioxide (Ithink it is, without going out and looking)
It's all I've ever used in my MIG welder.......
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Old 08-19-2012, 08:35 AM
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y connection

I haven't used anything but Co2 on my lincoln sp 200, It's a commercial size and we have mostly done larger fab jobs with it. I have read where some guys Y the hose feed and feed from 2 seperate bottles. argon and co2, I have a y on my Tig so I can feed a back purge with argon, I worked at a shop that furnished parts to the Harley factory and I remember on some jobs they even had a little hydrogen in the mix
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Old 08-19-2012, 10:01 AM
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You guys are making this way to complicated. The standard in the autobody industry is 75/25 it is commonly called simply 75/25 which is 75% Argon and 25% C02 and it is in the same bottle. If you go to a welding supply shop they will have bottles of it ready to go 75/25. I personally have never seen any other mixes, either 75/25 or straight Argon or straight C02 but never have a seen another mix other than 75/25, again, it is the standard and there is nothing to think about.

Straight Argon is needed for welding aluminum or silicon bronze MIG. Straight C02, it is cheaper is the only reason you would want to use it. It creates a hotter weld with much more penetration, NOT what you want with sheetmetal, it's for fences and stuff like that when you are working outside and a lot of gas is being blown away.


Here is a cut to the chase chart from Miller welder company which makes I have to assume a huge majority of welders used across the country by professionals.




Here is the site I got that from for more study if you would like. http://www.millerwelds.com/resources...tips/MIG_tips/

Brian
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Old 08-19-2012, 11:07 AM
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i use fluxcore and a 110v welder for all my welding on this
sheet metal and frame mods including a mustII x-member

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Old 08-20-2012, 07:24 AM
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I have always used C25 gas ( 75% Ar + 25% CO2) with my Lincoln SP250. I did try Stargon gas, ( 90% Ar +8% CO2 + 2% O2) but did not see any different over C25 except the cost was more. A chassis builder I knew from Maine who worked at the Bath ship yard said that is what they used. According to Praxair the supplier it controlls the amount of carbon introduced into the material being used and improves the weld appearance. I still use C25.
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Old 08-20-2012, 08:33 PM
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I stand CORRECTED........ 75/25 IS ARGON & CO2......

it's a "standard mix" and I use it with my MILLER 140 Auto, 120vac unit...........
Works pretty good on everything but the heaviest (frame-type) stuff.....
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Old 08-21-2012, 10:57 AM
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OK, sounds like 75/25 it is then.

Thanks guys.
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Old 08-30-2012, 11:27 AM
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You should use 75/25 for short circuit mig welding. Tri mix gas is used for globular transfer and spray transfer mig welding not something you do on a car far to hot and deep penetrating, it's commonly used for pipe and pressure vessel fabrication. When tight welding you can use argon helium or nitrogen. Argon is the best all around because of cost/efficiency. Helium is better for titanium but floats away so a chamber of sorts should be used. Nitrogen is the cheapest but for shielding gas is not as good as argon but works good for a purge gas on stainless/aluminum ie facing a closed vessel with butt. Welds versus lap welds. Carbon dioxide is not an inert gas as the others are it is an active gas which will combination with puddle to make it hotter for same amperage /voltage it is typically used with dual shield wire for making welds on dirty materials ie rust scale oil etc. Finally I've never herd or use hydrogen in any welding gas as hydrogen is a fuel gas that burns and would negate the purpose of shelding gas by introducing new contaminants to the weld not to mention the resulting flame which you would likely not see. So in short 75argon/25co2 is your ideal gas for hardwire mig welding if your using flux core wire you can use 75/25 or co2 to get better results but wouldn't do it on anything thinner than 1/8" steel.

Kris,
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Old 09-01-2012, 03:32 AM
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Here down under we have an even simpler setup. When I get a bottle of gas from my supplier for my mig, it is simply called "Migshield". It has the correct ratio of argon/co2 blend. No hassles!!!!

mi chael.
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Old 09-01-2012, 09:12 AM
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We don't have to think about much here either as I said 75/25 is the norm and a without a doubt the most common used. Your Migshield appears to be very close with a 80/20 basically the same thing.

http://www.hkoxygen.com/database/Migshield.pdf

Brian
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Old 09-01-2012, 12:17 PM
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75/25 is also called C25 and that's what I use.
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Old 09-06-2012, 11:51 AM
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I've been using Airgas's steel mix for my MIG for years with good results.....
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