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Tool Talk Discussion Forum

MIG Brazing ?

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Bill in IL

05-16-2008 07:31:12




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I was thumbing through a cataloge and found silicon bronze MIG wire. I am not great at brazing with a torch so can this wire be used to replace Oxy fuel for brazing galvanized and cast iron? What type of sheilding gas do I use?

Is it possible to braze with a TIG torch?




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Little Ed

05-26-2008 19:14:23




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 Re: MIG Brazing ? in reply to Bill in IL, 05-16-2008 07:31:12  
I have done a fair amount of tig welding with a bronze rod that I was told was EvrDur. I was also told it was a phosphor bronze. It has an excellent color match with just about any brass or bronze that I have used it on. It also works very well on galvanized, but you have to get it into the puddle quickly, as the galv wants to explode onto the tig electrode. It is a high wear filler and have used it to repair areas that were worn out from moving parts, such as chainguards. I have never had any success getting it to stick cast iron back together, though.

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MarkB_MI

05-16-2008 13:08:54




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 Re: MIG Brazing ? in reply to Bill in IL, 05-16-2008 07:31:12  
They used to use silicon bronze to weld the roofs of cars. I saw this done in an auto assembly plant about fifteen years ago; I don't know if that's the process still used. I assume it was done to get a smooth weld that can be easily ground flat. (Since any rough weld would be very obvious on the roofline.)

I don't believe you will get anywhere near enough heat to braze cast iron with a typical MIG welder. Also, one big advantage a torch has over a MIG welder is that you can pre-heat the material. MIG welds inherently have cold starts, unless you preheat the material somehow.

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shawnspeed3

05-16-2008 10:01:09




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 Re: MIG Brazing ? in reply to Bill in IL, 05-16-2008 07:31:12  
Yes it is possible to use silicon bronze in a mig gun, it is mostly used for thin sections (sheetmetal) in high production work. TIG welding and silicon bronze works extremly well, very clean,low heat. You use argon with TIG and dc -,or if the part is a little oily AC also workswith a little Hi Freq (same as aluminum), You will get a little bigger weld /braze juoint on AC also. Silicon bronze for TIG & MIG is not the same as used in O/A Brazing, Be sure to get the right rod for your application...Good luck Shawn

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Bill in IL

05-16-2008 11:01:29




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 Re: MIG Brazing ? in reply to shawnspeed3, 05-16-2008 10:01:09  
Well they advertise it for use with galvanized sheet metal but it did sound too good to work just like any other mig process.

I have some carbon rods I will have to try them on a nut sometime.



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Sam from WA

05-16-2008 08:54:14




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 Re: MIG Brazing ? in reply to Bill in IL, 05-16-2008 07:31:12  
No, the MIG wire is for WELDING bronze castings. A TIG welder will not work either, because it will melt the base material into a puddle of molten metal. It will not heat the base metal like you want it to. The best way to use an electric process to replace a torch is a carbon-arc torch for an arc welder (stick welder). The way I see it, its much easier to braze things with a torch than with the carbo-arc torch. I have used both, but I think I"ll stick to the oxy-acetylene torch.

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rst277

05-16-2008 09:29:31




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 Re: MIG Brazing ? in reply to Sam from WA, 05-16-2008 08:54:14  
The carbon arc torch is hard to braze with. It is fantastic for loosening stuck nuts though. Put one electrode on either side at 100-125amps and watch that nut turn red!! I prefer the carbon arc torch to oxy acetylene for working under vehicles, less chance of an accident.



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Sam from WA

05-16-2008 09:43:00




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 Re: MIG Brazing ? in reply to rst277, 05-16-2008 09:29:31  
I can't agree with ya more. The carbon-arc is hard to braze with, but works great for other things.



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