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Old 08-12-2017, 09:06 AM   #1
old51sedan
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Question MI: Welder

Thinking of buying a mig welder to fill several holes that have been drilled in the box of my truck by PO over the years. In talking with my buddy who owns a body shop, he tells me not to buy one that uses flux. He says the flux will pop through bondo if it next to it. Has anyone had this problem? I'm not sure what to buy now, I'd like something that runs on 120 volt.
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Old 08-12-2017, 09:21 AM   #2
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Re: MI: Welder

[QUOTE=old51sedan;8014860]Thinking of buying a mig welder to fill several holes that have been drilled in the box of my truck by PO over the years. In talking with my buddy who owns a body shop, he tells me not to buy one that uses flux. He says the flux will pop through bondo if it next to it. Has anyone had this problem? I'm not sure what to buy now, I'd like something that runs on 120 volt.[/QUOTE

All I can offer is having welded and will be welding today with a mig welder near bondo, the bondo does melt/pop when you weld, but I was told it's the heat of the welding.
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Old 08-12-2017, 03:31 PM   #3
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Re: MI: Welder

Bondo is flammable as hell. You don't want flux for body because it's messy and hotter thank hard wire.
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Old 08-12-2017, 06:11 PM   #4
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Re: MI: Welder

Flux core welding is not what you want for bodywork. Too hot, you'll wind up burning holes in sheet metal and have more problems than when you started. Get a mig machine that will run solid wire and argon/co2 gas. All manufactures now offer dual voltage 110v/220v mig machines. 110v power will get you by for sheet metal, and if you ever need to weld heavier stuff, you'll have the 220v power capability.
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Old 08-12-2017, 07:28 PM   #5
old51sedan
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Re: MI: Welder

[quote=my56chevytruck;8014868]
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Originally Posted by old51sedan View Post
Thinking of buying a mig welder to fill several holes that have been drilled in the box of my truck by PO over the years. In talking with my buddy who owns a body shop, he tells me not to buy one that uses flux. He says the flux will pop through bondo if it next to it. Has anyone had this problem? I'm not sure what to buy now, I'd like something that runs on 120 volt.[/QUOTE

All I can offer is having welded and will be welding today with a mig welder near bondo, the bondo does melt/pop when you weld, but I was told it's the heat of the welding.
Thanks guys for the replies. I was talking about doing the body work after welding with flux. I was told if you apply bondo over flux weld there is a chance that the flux could pop the bondo over time. I like the idea of using the co2, it sounds a little more expensive, but may be best in the long run. Thanks again
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Old 08-12-2017, 10:03 PM   #6
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Re: MI: Welder

I have several welders but in restoring my 72 k10 I'm using my Hobart 140 with gas. Works great. When I bought it I checked all over the web for the lowest price and it was Northern tool. But the bottle will set you back some also. I'd look for a used bottle that has been certified and filled
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Old 08-13-2017, 07:55 AM   #7
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Re: MI: Welder

[quote=old51sedan;8015194]
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Originally Posted by my56chevytruck View Post

Thanks guys for the replies. I was talking about doing the body work after welding with flux. I was told if you apply bondo over flux weld there is a chance that the flux could pop the bondo over time. I like the idea of using the co2, it sounds a little more expensive, but may be best in the long run. Thanks again
As has been stated previously, you don't want to use flux core, period. Or stated another way, no flux core. Haha. I'm sure there are other applications but the only thing that I can think of is outside in inclimate weather when the shield gas is affected would be an application for flux core.

I use .023 wire for sheet metal. I have a small Miller 180 that i just run .023 in all the time. I keep .035 wire in my Miller 251 for heavier stuff.

As far as the gas bottle is concerned, either get the bottle from the place you plan to get it filled or make sure if you buy one it is from a legitimate place to get it filled. At least where I am, one vendor won't fill another vendor's gas cylinder.
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Old 08-13-2017, 03:43 PM   #8
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Re: MI: Welder

I second the Hobart 140. It's a great little welder and it's perfect for bodywork with .023 wire.
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Old 08-14-2017, 12:11 PM   #9
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Re: MI: Welder

For tin you don't need a big welder. Even a 90 is bigger than you need for just tin work. No flux core. Use 023 wire and 75/25 gas. I use Esab easy grind wire as it's softer and will hammer out to stretch the seam easier with less chance of cracking. It also grinds easier and that puts less heat and less additional shrink into the panel as well.
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