02GF74
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| posted on 13/5/09 at 07:29 AM |
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MIG welding with CO2
didn't go as nicely as Ar/CO2 mix.
After reading what was written on here, thought I'd have a go.
Hmmmm, results not so good.
It felt like the wire was resisting - did turn the feed up and down - and was making much more splattering.
Not to mention the fuse blowing and then the thermal cut out going (for a while I thought the motor had died!).
Thing is I did much longer runs with the other gas and no cutting out.
I tidied up one of the welds and could see a hairline gap between the weld and the parent metal, hmmmmm, not goood.. 
Guess I'm gonna have to grind back and redo when I get Ar/CO2.
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wozsher
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| posted on 13/5/09 at 07:57 AM |
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Sounds like you may have the gas pressure too high,this can cause the weld to cool too quickly.Try setting the gas like someone is gently blowing on
your face.
Some pics may help,
Woz
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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clanger
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| posted on 13/5/09 at 08:02 AM |
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Get one of these.
Takes the guess work out. I got one and its well worth the cost of the extra gas you can waste otherwise.
Flowmeter
Also check out this forum. Lots of help on here:
Mig Welding
[Edited on 13/5/09 by clanger]
[Edited on 13/5/09 by clanger]
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MikeRJ
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| posted on 13/5/09 at 08:07 AM |
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It's almost certainly just a case of welder settings and technique. I had a really hard time switching over from pure CO2 to CO2/Argon mix. I
just couldn't get a decent weld out of it until I spent a while (and quite a lot of gas I suspect) playing with settings and even then I
wasn't comfortable with it for a while.
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loggyboy
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| posted on 13/5/09 at 11:10 AM |
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What wire thickness are you using? I tend to prefer 0.6 as it travels down the system easier giving less resistance
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hellbent345
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| posted on 13/5/09 at 11:54 AM |
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c02 will sound a lot harsher, and there will be a lot more splatter. but it is cheaper, and it does run hotter if you have the settings right, i tried
switching from co2 to argon mix with my welder maxed out getting through 3-4mm plate and it would only just get through 1.8mm tube...
[Edited on 13/5/09 by hellbent345]
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