MIG welding wire selections - Team Camaro Tech
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post #1 of 9 (permalink) Old Nov 20th, 00, 09:52 AM Thread Starter
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hello everyone,

I have a quick ? relating to mig's , I have a 90amp Craftsman Mig that I just purchased. its great, I currently have only used flux core wire, since my gas bottle was 88 bux , refills are only between 10 and 19 bux. my main ? is this. I am running .24 steel wire, and .30 flux core (not at the same time!) everyone says they like flux core better, but I cant seem to get a good CLEAN weld. it leaves too much sludge and is hard to get a good weld puddle. But when I use the Steel wire with the 75/25 mixture bottle it welds awesome.

the only stinker is it is usually windy in my storage facility where I store my car, and VERY DRAFTY when the door is closed. so that is why I use flux core wire.

Is there some trick I am missing with wire speed Vs. Temperature that is different with Flux Core.??

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post #2 of 9 (permalink) Old Nov 20th, 00, 11:23 AM
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i use flux core on thicker metal ,you just have to play around with the settings to see what works best,if welding sheetmetal i would recommend solid(thinner) wire with gas(keep from blowing holes in your work)
good-luck..

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post #3 of 9 (permalink) Old Nov 20th, 00, 12:24 PM
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Flux cored wire needs more heat because it has to melt the non-metal ingrediants in the flux that act as alloying elements and degassers.The degassers are what allow you to weld in pretty windy conditions and still get a sound weld.The drawback is that they form a slag over the weld that can be a pain to remove.Solid wire gets it's gas protection from the bottle and since you only have to melt the wire you can get away with alot lower heat input.There is a specific wire available for bodywork that is more pliable and softer.This makes it easier to grind and work afterward.Also, on my Hobart welder I change the polarity when changing from one wire type to the other.Staight polarity for fluxed wire and reverse for solid.

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post #4 of 9 (permalink) Old Nov 20th, 00, 03:45 PM
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You can have some air movement, like the amount a small fan would provide.
If there is more than that, you should shield the welding area with a welding blanket or something.
You can up the gas rate to help too.
I use 21 cfm setting normally, but up it for drafty places.

Flux core is not good for thin metal use, as the guys stated above.
You can go to CO2 shielding gas to save money. The mix is supposed to be better on thin stuff though.
David

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post #5 of 9 (permalink) Old Nov 21st, 00, 06:42 AM
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Hey Crash, what the name of the wire for body panel use that you talked about? I have an old hobart and sure would like to give it a try.
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post #6 of 9 (permalink) Old Nov 21st, 00, 08:21 AM
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Chris,
Haynes makes a good book on welding titled: Haynes TECHBOOK WELDING MANUAL. It is great for beginners and also for those who know how to weld. It talks about all forms of welding, but has a good page or two on wire selection, and mentions a wire made by L-tec called Easy Grind. I haven't used it but have friends who swear by it for body work. I too tried using the flux core stuff first, just because of the initial expense of the C-25 bottle. But you usually do start with oysters and work your way to caviar. Man the gas is smooth, no spatter to grind, no slag to clean. That's strange that everyone tells you flux core is better, I've never met anybody that has preferred it unless they are welding a steel fence in the middle of a pasture in a 100mph wind! Take any measures possible to create a wind break and go gas.

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post #7 of 9 (permalink) Old Nov 22nd, 00, 04:50 AM Thread Starter
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thanks for the tips everyone! , I went out and played around some more last night. Practicing and all. I did have to reverse the polarity on the welder when I switched to Gas and solid wire. but it is easier and nicer to weld with . no slag and slop. just the metal puddle and the wire. alot better. thanks everyone!


[This message has been edited by Chris Edwards (edited 11-22-2000).]
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post #8 of 9 (permalink) Old Nov 22nd, 00, 05:18 AM
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Hi chris ,
noticed you were from baltimore . Ilive on the shore do you know of any camaro clubs/shows around here?

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post #9 of 9 (permalink) Old Nov 23rd, 00, 12:45 AM
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Just a tip for the welders. After you have ground the metal to prepare for welding, go over the area with painter's metal prep just as you would before painting. Clean it off as per directions and regrind with a finer grit and then do your welding. You will be surprised at the quality of the weld no matter which wire you use. The other advice on shielding was right on the money.
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