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Tool Talk Discussion Forum

Brazing flux??

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Jay87T

12-07-2006 14:05:38




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Hey guys, whats the differance between Brazing flux and regular flux, Im new to brazing or learning anyways and things just arnt working well for me, I have used a flux coated brazing rod and am very pleased with the results, but Im tring to braze using normal rods, what is the proceedure for brazing with normal rods? dip it in "brazing flux" and then apply? Thanks.




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T_Bone

12-08-2006 19:30:34




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 Re: Brazing flux?? in reply to Jay87T, 12-07-2006 14:05:38  
Hi Jay,

Use Broax or borax/alcohol mix for a flux for 90% of the metals you'll see at a home/commerical shop.

Keep the base metal and filler rod clean of slag, scale, grease, dirt, rust and most of the time a flux is not needed.

A flux will most likely be requird where filler metal and base metal don't match composistion, ie; brass on cast iron is a good example.

Fe, SS, Pb, Cu, Zn, Al, all can be braze welded without flux. Cleaness is must tho.

T_Bone

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dr.sportster

12-08-2006 14:06:34




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 Re: Brazing flux?? in reply to Jay87T, 12-07-2006 14:05:38  
My flux can says Boraxo right on it.One can has lasted forever.It is not a wet paste flux like for plumbing solder but powder for brass rod.Its cheaper than flux coated rod but its good to have both.There is also a white powder flux for oxy/acet welding aluminum but complete different product.Dont get the base metal too hot just enough for the brass rod to flow onto the work.With flux coated rods or flux from can on uncoated rod I used to try to smear some of the flux coating on the work area you can heat and add a bit of flux to the joint.Its used to put alot of things like petcocks onto fuel tanks.In a close fit bicycle frame a braze is stronger than a weld[I know thats an old technology statement and all these mountain bikes are TIG welded but a close fit pipe inside another pipe is as strong brazed as welded]. If you can do it with the flux coated you just have to get more flux to stick to the uncoated and its the same thing.Its very handy to have around.Everybody else already nailed the heat the rod part.Practice by making some art thing like a brass coated teardrop shape hanging blob from scrap steel.Sounds like you already have the hang of it.

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Bud in NC

12-08-2006 03:16:01




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 Re: Brazing flux?? in reply to Jay87T, 12-07-2006 14:05:38  
I always prefered dipping the rod in the flux - I've used the pre coated rods but I still had to add more flux.
'Nother thing to note since you said you're new to brazing - if the brazing "Pops" you're too hot - back off till the brazing is managable - not flowing like water. Use distance from your braze to do the *fine* temp control.
After the work is cooled, you may want to clean off the excess flux - it acts like it's glass - WEAR GLASSES!
Here's some more info on flux in general - Link

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135 Fan

12-08-2006 16:16:48




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 Re: Brazing flux?? in reply to Bud in NC, 12-08-2006 03:16:01  
I've always used the coated rods. New a guy that would even scrape some of the flux off for certain jobs. Another way to tell if your too hot is if you get a lot of white smoke around the area you brazed. Dave



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GregCO

12-07-2006 14:47:09




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 Re: Brazing flux?? in reply to Jay87T, 12-07-2006 14:05:38  
Yep, preheat the rod and then dip it into the flux and it will stick to the rod.

This may be a bad habit, but an old time welder turned me on to Boraxo powder to flux my brazing rod with and it works great.

Greg



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jeffcat

12-07-2006 16:56:09




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 Re: Brazing flux?? in reply to GregCO, 12-07-2006 14:47:09  
Yup just good old Boraxo laundry powder. NOT the hand soap in the little can. Last time I used Boraxo has to be like 30 years ago. I just buy a couple of pounds of flux rod and keep it in a sealed can. Use some #40 plastic pipe ,cut to how long your rod is and throw in a couple of silica packs. Top it off with a cap and your rod stays nice and dry. My dad still uses the one I made 30 years ago. Jeffcat

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steve from mo - dangit!

12-07-2006 14:17:41




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 Heat it first. in reply to Jay87T, 12-07-2006 14:05:38  
The flux sticks better if the brazing rod is hot when you dip it in the flux.



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Jay87T

12-07-2006 16:19:32




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 Re: Heat it first. in reply to steve from mo - dangit!, 12-07-2006 14:17:41  
hi, does it have to be brazing flux? or is all flux the same? what are the differances, I have a big can of general flux, but not sure if that will work or not.



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steve from mo - dangit!

12-08-2006 12:01:53




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 Brazing flux for brass rod. in reply to Jay87T, 12-07-2006 16:19:32  
Flux is a chemical cleaner so you need the correct one for the material you are using.



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