Can You Recommend A Welder For Sheet Metal Repair ? - Welding & Steel Trades - Contractor Talk

Can You Recommend A Welder For Sheet Metal Repair ?

 
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Old 12-19-2015, 07:20 PM   #1
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Can You Recommend A Welder For Sheet Metal Repair ?


I have a very unique situation here . First of all, I am not a professional welder, but I do own a Lincoln Electric AC225s Arc Welder .


I am in a middle of a Brownstone Renovation where I am stripping paint off of a metal cornice on the exterior and repainting . However, there are a few quarter size holes that have rusted out . I just don't want to fill it bondo, but cut the rust out and weld a new piece into place .

Question is , can I purchase a cheap Harbor freight welder to do this or even use my stick welder ?
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Old 12-19-2015, 08:21 PM   #2
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


A cheap mig could do it, but tig makes a more workable weld...

Have an oxacetylene outfit? I'd gas weld it myself

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Old 12-19-2015, 08:25 PM   #3
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Quote:
Originally Posted by plazaman View Post
I have a very unique situation here . First of all, I am not a professional welder, but I do own a Lincoln Electric AC225s Arc Welder .


I am in a middle of a Brownstone Renovation where I am stripping paint off of a metal cornice on the exterior and repainting . However, there are a few quarter size holes that have rusted out . I just don't want to fill it bondo, but cut the rust out and weld a new piece into place .

Question is , can I purchase a cheap Harbor freight welder to do this or even use my stick welder ?
Are you set on welding?

I've used this in similar situations, and blind rivets work fantastic and if done right will last as least as long as it has thus far.

http://www.eastwood.com/ew-no-weld-p...FVQYHwodaeQIUw

Welding upside down or from scaffolding isn't as easy as welding something on a welding table.

If you have the skill to do it, go for it, I don't believe that it would be a better repair, just different.
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Old 12-19-2015, 08:30 PM   #4
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Stick welder is a no go. HF welder without a shielding gas will most certainly blow right thru it. It will take a decent welder to get the heat and feed set correctly, unless you dot the welds along. Brazing torch might be the best option with a brass rod, EXCEPT: DO NOT WELD ON GALVANIZED METAL, without a fresh air system or scuba tank.

Honestly, I would look into an epoxy repair, like JB Weld after removing the rust. Be careful to not breathe any grinding dust from galvanized metal.
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Old 12-19-2015, 08:59 PM   #5
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


back in the day sheet goods were often soldered

http://www.gsa.gov/portal/content/111750
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Old 12-19-2015, 09:29 PM   #6
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


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Originally Posted by Tom Struble View Post
back in the day sheet goods were often soldered

http://www.gsa.gov/portal/content/111750

I would try to fill with a 50/50 bar or something similar.

You start striking an arc on old ass tin cornice and you will quickly be fixing 5x what you started with.
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Old 12-19-2015, 09:49 PM   #7
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


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Originally Posted by WarnerConstInc. View Post
I would try to fill with a 50/50 bar or something similar.
Okay school me on what a 50/50 bar is please. Cause all I can find is the Urban Dictionary description.
"50 50 bar:
A term used to describe a turd poop that comes out half diarhhea and half formed.
"I just left a 50/50 bar in that toilet."

Or...


Quote:
Originally Posted by WarnerConstInc. View Post
You start striking an arc on old ass tin cornice and you will quickly be fixing 5x what you started with.
I agree 100%! Even with a TIG welder. Not a good place to be learning.

Edit: Found it. Not going to find that in California...lead.
http://www.grainger.com/product/WORT...UDED-BAR-5EGA7

Might be best to sub it to a sheet metal worker.

Last edited by Peter_C; 12-19-2015 at 09:54 PM.
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Old 12-19-2015, 10:05 PM   #8
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Quote:
Originally Posted by Peter_C View Post
Okay school me on what a 50/50 bar is please.
50% Tin, 50% lead solder. Commonly used on flat seam metal roofing and tin cornice miters and repair work.
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Old 12-20-2015, 09:41 AM   #9
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


It looks like that no weld pair kit would do the trick .



What torch would I use that 50/50 with ?
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Old 12-20-2015, 09:48 AM   #10
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


I've only ever used a soldering iron. Scuff the mating surfaces with sandpaper, brush on a little paste flux, solder, then wipe the flux with a damp rag when cooled or use spray flux remover.
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Old 12-20-2015, 12:30 PM   #11
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


that link i provided will tell you how to do copper or steel
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Old 12-20-2015, 06:12 PM   #12
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Solder it would be good. Acetylene, propane, map gas will all work
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Old 12-20-2015, 10:44 PM   #13
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


I have mapp gas, maybe I'll try that .

So am I using the solder as filler? Or am I soldering a piece of metal to it ? Remember this is metal tin cornice in a vertical application . It's hollow behind it .
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Old 12-21-2015, 06:22 AM   #14
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


soldering sheet metal takes some knowledge and skill,especially if your going to try it with a torch..i would suggest leaving the torch at home
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Old 12-21-2015, 10:55 AM   #15
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Soldering is easy; if you've sweated copper pipes you can do it. You don't need 50/50, though you can get it, including in California. Lead free from a body shop supplier wd be fine: http://www.eastwood.com/lead-solder-...al-information, or lead-free plumbing solder would be perfectly fine for a small patch. The disadvantage of lead free is that it's more expensive, and that it may be more likely to break under stress, if not done as well. Neither of those considerations matters for a small patch. The secret is - as with all soldering - to get perfectly clean metal, flux where you want the solder to go, and have the piece clamped, riveted or held tightly in place, while heat then apply the solder.

If you think you're going to start a fire, don't do it (or use some old soldering irons (which really requires a helper and a bigger torch to heat them)).

.... or just bondo or epoxy a patch. For a 1" patch, just about anything would do. For me the question would be whether the surrounding area would stand up to the sanding or grinding necessary to get to clean metal for soldering.
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Old 12-21-2015, 11:25 AM   #16
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Quote:
Originally Posted by Tom Struble View Post
back in the day sheet goods were often soldered

http://www.gsa.gov/portal/content/111750
And once it's been contaminated with lead forget welding over it.
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Old 12-21-2015, 03:55 PM   #17
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Certainly don't try to solder sheet tin with a torch. It will warp and burn and leave you a big mess. Save that for copper or brass. If you get the heat right on a properly tinned iron, it would be quite doable though. Tin takes solder very easily if its clean. Cut muriatic acid makes a good flux. Any tin solder will work, though 50/50 melts at a lower temp as is a little easier to work with.
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Old 12-21-2015, 03:57 PM   #18
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


50/50 is the easiest and best.

Soldering with the lead free crap is nearly impossible

I have several old copper irons, and a few homemade spoons I use.
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Old 12-21-2015, 05:40 PM   #19
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


Quote:
Originally Posted by CarpenterSFO View Post
Soldering is easy; if you've sweated copper pipes you can do it. You don't need 50/50, though you can get it, including in California. Lead free from a body shop supplier wd be fine: http://www.eastwood.com/lead-solder-...al-information, or lead-free plumbing solder would be perfectly fine for a small patch. The disadvantage of lead free is that it's more expensive, and that it may be more likely to break under stress, if not done as well. Neither of those considerations matters for a small patch. The secret is - as with all soldering - to get perfectly clean metal, flux where you want the solder to go, and have the piece clamped, riveted or held tightly in place, while heat then apply the solder.

If you think you're going to start a fire, don't do it (or use some old soldering irons (which really requires a helper and a bigger torch to heat them)).

.... or just bondo or epoxy a patch. For a 1" patch, just about anything would do. For me the question would be whether the surrounding area would stand up to the sanding or grinding necessary to get to clean metal for soldering.
..no..that is not the ''only secret''op says it was rusty so i'm assuming it's tin
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Old 12-21-2015, 05:49 PM   #20
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Re: Can You Recommend A Welder For Sheet Metal Repair ?


If you have quarter sized rust holes, most likely the surrounding areas is also thin and weak. You'd blow holes like crazy. I dont know what your working on but avoid butt welds. Flange the edges, do a template, cut from new metal, punch holes. Weld through primer, then you can use a flux mig.

If you do use a cheap harbor freight mig, re-clean the ground clamp and bolt, and replace the stock wire with something better. Innershield works well.

http://www.harborfreight.com/air-pun...tool-1110.html

Try not to go too thick on the metal sheeting. The metal punch has a limit. 16ga is what its rated to.


However, if you have access through the back, get a copper backer blank, and go at it with your stick, 1/16th if you have. you cant blow through the copper, so it actually works out quite well.

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