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Wire welder

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Mike

04-28-2002 17:13:07

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I just bought a wire welder with a mig conversion kit. I was told that I could just use the oxygen bottle on my cutting torch as the sheilding gas. Is this correct or should I be using something else? Thanks in advance for any comments.

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Dan

04-29-2002 02:20:00

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Re: wire welder in reply to Mike, 04-28-2002 17:13:07

Mike
100% oxygen cannot be used as a shielding gas. Oxygen is one of the elements that you are trying to shield from the weld puddle. Oxygen will create porous welds. However certain oxidizing gas mixtures are used with GMAW (MIG). An example of two that you would use on steel with your machine are CO2 and 75% argon / 25% CO2 also known as C25. What makes it posssible to use a MILD oxidizing gas on mild steel is because when your welding wire is manufactured certain elements are added to the wire that help pull a low level of an oxidizing gas from the weld puddle.Im going to stop this part of this discussion right here. If you want to go any deeper there are plenty of welding books available that cover the topic deeper.

Now to the dicussion of which gas to use. Im going to assume for now that since you bought a wirefeeder with a gas coversion kit it is either a small 110 or 220 volt machine. With these machines 75 argon / 25 co2 would be your best choice. Biggest reason is because C25 requires a lower arc voltage then co 2 for the same thickness of material. 75/25 also produces a more spatter free weld then co2. Co2 is mainly benefical with larger machines that can create a globular mode of metal transfer. Then co 2 helps greatly increase the penetration of the weld bead.

So with all the above confusing information mentioned the recommendation to you would be to use a shielding gas mixture of 75% argon/ 25% CO 2 with an E 70S-6 steel wire.

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Ford Man

04-28-2002 18:30:51

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Re: wire welder in reply to Mike, 04-28-2002 17:13:07

NO , NO , No !

Do not use the oxygen as a shielding gas !

You need to go to your local welding supply house . They can fix you up with gas , regulators and so forth .

You will need to change the polarity on the welder to be able to weld with gas . If you don't have a manual , get one ! It will be a big help .

Good Luck !
Ford Man

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steve

04-28-2002 18:24:36

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Re: wire welder in reply to Mike, 04-28-2002 17:13:07

in MIG, the IG is inert gas. You can use CO2 if you are welding mild steel. If you are welding stainless or aluminum you need an argon/ CO2 mixture. Go the the local gas supplier/ weld shop and talk to them about a botle. I use a CO2 aluminum bottle about 3 feet tall, that came off a soda fountain machine.

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