brazing steel

[Unknown_road]

What do you guys use for filler to braze steel? I'm brazing a 80mm tube on a flat plate. I tryed 40% silver but I don't really like it because you can't really fill gaps with it. And I tryed a rods that are called "new silver" , it doesn't contain any silver but a high amount of copper and some zinc and nickel. It works really nice but it has a very high melting point (910*C). Can you guys recommend me anything?

[wdrzal]

brass rod with flux,I like the white ones that have a hard flux coating on the outside.Or you can buy plain ones and a caN OF FLUX. heat the rod slightly and dip the end in the flux. heating the rod is to make the flux stick on plain ones.

[runmc]

Clothes hangers :ROTF: :shrug:

[wdrzal]

you can gas weld with mild steel rod or clothes hngers but its much easier to just flow some brass rod, its quite strong.

[Unknown_road]

Thanks I'll look for brass ones.

clothes hangers aren't a problem to get for me. I work at a laundry for hospitals and they trow away 2-3 cubic meter of those things a week.

[runmc]

Actually Walts idea is much better. :woot: I was thinking back to the good old days when we would braze glass packs on our hot rods with a clothes hanger. Clothes Hangers are easy to find and cheap and there are tons of things you can braze with them. I would much rather use a brass rod. :fact: I haven't used a clothes hanger in ages. :(

[wdrzal]

gas welding with mild steel rod is much harder to do, you must get both pieces being joined plus the rod right to their melting point.This is a little trickey to do without melting thru . Brass rod works better, but not as strong,because it melts below the melting point of the steel being joined, it has good adhesion and fills gaps well.

you do need acet/oxy torch no matter which you choose.

[Unknown_road]

I got propane/oxy. Do brass rods have a higher melting point then 910*C?

[jinu117]

I got propane/oxy. Do brass rods have a higher melting point then 910*C?

No idea about actual temp but I was using wrong rod for doing copper to copper and found out that rod is brass rod .... ahahaha. (too hard to heat it up... instead of this silver rod) Since I did have about 40 joints practice on it (not on stainless steel but just on copper to copper) I can tell you even mapp+oxy combination takes some time to heat up the material to decent temp to let it flow -> Reason I was thinking about going ace/oxy setup before I found out I was using wrong rod for job.. I guess you plan to do this for suction line? :P I found some interesting items for those flex suction line but none seems to have copper tubing at end... :P

[wdrzal]

I got propane/oxy. Do brass rods have a higher melting point then 910*C?


thats fine, any gas with oxygen is hot enough