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Tool Talk Discussion Forum

Re: What is the correct way to adjust your gas while MIG welding

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jon f mn

06-10-2013 07:08:17

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It really depends on the conditions. Inside with no wind on clean metal I'll run 15-20 cfh. If the metal has some rust or paint or I'm working in some wind I'll turn it up to 30 cfh or a bit more. Working on farm machinery is not the same as certified welding on a presure tank and is much more forgiving. Also there is some veriation in regulators and gages so any fine recomendations have to be adjusted for those differences. It sounds like you are close but if your concerned about how much you are spending on gas just start cutting back til you get porosity or trouble with the weld the go back up til it works again. Here is a link to help out a bit.

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JD Seller

06-10-2013 20:59:01

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 Re: What is the correct way to adjust your gas while MIG welding in reply to jon f mn, 06-10-2013 07:08:17  
Jon: My concern is quality of weld not cost of gas. A tank lasts me 1-2 months now. So it is not a big cost compared to the benefits of the wire welder.

An example of my concerns. Today I had to do some welding on a bale trailer. Just some flat irons I added to keep the bales form sliding off sideways. They are light flat iron deliberately. They are always getting hit accidental. This way they give rather than some thing major. Half way through the repair I had to switch wire when I ran out. When I started to weld after that I got worm holes in the beads. Same steel, ground clean, inside so zero wind. The wire brand was different but the same size and rating. So what changed??? Even more puzzling to me is that after a few welds it quit doing it.

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jon f mn

06-11-2013 06:01:14

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 Re: What is the correct way to adjust your gas while MIG welding in reply to JD Seller, 06-10-2013 20:59:01  
There are many reasons that could have happened. A bad stretch of wire is quite common. Wire varies a lot and I've had to toss more than one roll because it didn't work, some for feed problems because they had bad shape and wouldn't feed even. Some for content problems that caused what you have. If it only lasted for a bit it could be gas contamination in the gun from something you did while changing the roll. I've also seen bad spots or contamination in the iron give problems. Without seeing it while you are welding, anything I say is just a guess tho. That is the problem with giving advice here, diagnosing a welding problem, especially with mig, is as much about sight and sound as the technical settings and we don't have that here.

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Stick welding

06-10-2013 22:13:46

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 Re: What is the correct way to adjust your gas while MIG welding in reply to JD Seller, 06-10-2013 20:59:01  
The first part of the wire could have been contaminated and/or dirty, maybe from your hands? Sometimes spatter will build up inside the nozzle and block the gas flow. That's why a lot of welders don't like the spatter spray. It doesn't let spatter stick but can cause dirt and stuff to stick in the nozzle. Nozzle gel is applied when the nozzle is hot, drips off and doesn't leave a sticky surface to catch anything.

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JD Seller

06-11-2013 05:56:27

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 Re: What is the correct way to adjust your gas while MIG welding in reply to Stick welding, 06-10-2013 22:13:46  
I use the regular nozzle anti splatter paste in the small can. I dip the wand/nozzle in while hot. When I replace the small copper wire guide I usually clean up the outer copper shield on the inside too.

I am a real novice on this MIG welding. I have been thinking of taking a welding coarse this winter at the local community college to learn more.

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