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Tool Talk Discussion Forum

Brazing sheet metal

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John A (TX)

11-05-2003 07:53:13




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Would like to try my hand at brazing "fender thickness" sheet metal .. thin stuff. I have the oxy/acet. eqpt but am not sure what rods to use.

Searched the archives and saw something about aluminum filler rods. Would that work? Or is there something else that's preferable?

I reckon wirefeed would sure be the way to go, but I just can't do that right now, so sure would appreciate some advice.

BTW, to email me direct, remove 'mypants' :-)

~ja

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John A (TX)

11-06-2003 10:27:15




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
Thanks, All! The advice looks great - and is most appreciated.

On a side note: I watched a buddy do some gas welding on aircraft tubing once. The movements he was making with both hands - feeding the wire at the correct right, moving the flame in and out to keep the temp where he wanted it - looked more difficult than flying a helicopter! Kinda scared me off but I reckon I'm ready to have another go at it.

Regards ..
~ja

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John Ne.

11-05-2003 20:10:38




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
If you do want to try gas welding, use an old coat hanger as suggested, its nice mild steel wire, the newer gold colored coat hangers are made from reprocessed steel, full of alloys, and cannot be welded with, trust me. John in Ne.



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Mac

11-05-2003 19:01:01




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
Use a small tip and follow mj's posting. Practice a lot and go for it. Dont try to mix and match components on welding.



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John K

11-05-2003 18:00:17




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
Just a note about brazing. You can oxy-act weld, stick weld, or mig weld steel. You can braze or solder steel. You can not braze or weld to steel if it has been soldered. Also you can not weld to steel that has been brazed. The only way to weld steel after it has been soldered or brazed is to grind off the solder or the brazing material and any of it that has entered the pors of the steel. If not, when attempting to weld, the welding process will be an effort in futility. The arc will spit and splater with little or no adhesion. What I am trying to say is that you can weld steel a steel joint in this order, arc or oxy-acet steel welding, brazing then solder but not in reverse of this order. Also aluminum rod is only good for aluminum.

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Carol Martin

11-05-2003 16:35:40




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
I Built a 30X50 Barn a couple years ago from Insulated steel door panels..(The piece cut out for windows.).These were approx 36X22" panels. I had to cut thru one thickness on three sides to make them over lap and fit between studs.. I figured it out one day and I cut a little over 2 Miles of this heavy steel. I used a (bunch) of plywood blades in backwards on a 10" table saw. I think I probably used about 20 Blades.. They do Work Great to cut sheet metal.. I bought a regular sheet metal blade and that worked terrible.. The barn Came out beautiful but it was a lot of work but I had the time and did not have to rush..

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Carol Martin

11-05-2003 16:40:32




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 Re: Re: Brazing sheet metal in reply to Carol Martin, 11-05-2003 16:35:40  
Sorry Posted that in the wrong place..



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Chris Brown

11-05-2003 16:30:26




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
Most big hardware stores and nearly all farm and homes have flux coated brass rods about 3 feet long and different thickness. Just like soldering,but hotter and brighter.



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Bus Driver

11-05-2003 16:27:48




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
To keep warping to a minimum, tack weld many small places rather than just starting and welding solid. Next tack between the original places. When the interval between tacks is about 1", start welding solid. But skip around to keep the panel from overheating in any one area.



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Chester

11-06-2003 15:56:58




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 Re: Re: Brazing sheet metal in reply to Bus Driver, 11-05-2003 16:27:48  
Do as BusDriver suggests, also get that sheet metal absolutely clean and use an '' 000 '' tip with the smallest flame possible that will still do the job. I also cool my work with a damp rag as I go. Practice on some uncoated scrap and see how little heat is needed for a decent joint. Using this method, I have put many recessed patches in the center of doors and fenders with no warpage.



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mj

11-05-2003 16:05:21




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 Re: Brazing sheet metal in reply to John A (TX), 11-05-2003 07:53:13  
Get some scrap sheetmetal and some wire coathanger for rod and go to practicing....keep the rod near the weld and dip it into the puddle to cool and fill as you go with a neutral flame. Watch the puddle and the end of the rod to keep them at the melting point. Use a horseshoe pattern with the torch to direct the melt and form the bead. You can fill a good-sized gap this way once you get on to it. To braze get some brass rod with flux attached or use bare rod and a can of brazing flux (my pref.), bring the rod to near melting and stab it into the flux to adhere it to the rod. Bring the sheet to red and feed the rod onto the joint...move the torch in a modified in-and-out horseshoe pattern to produce a bead, pulling it away as necessary to prevent overheating. Make sure that your torch flame is nuetral to sightly carburizing for brazing. Enjoy! :-)

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