Acetylene only for brazing

[rcairboater]

Hello, my question, I want to braze not solder small mild steel solid rod such as 1/4 and smaller and small tube.

I have a acetylene turbo torch. What size and type brazing rod do I need and I don't want to use solder.

Thanks,
Gary

[jeffrey.penfield]

Typically you use a rod the diameter as the thickness of your metal. For mild steel the usual rod is a bronze rod. It is actually a brass rod with flux on it, they just call it bronze. Or you could use a bare brass rod and add flux paste to the metal.


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[rcairboater]

Thank you for responding. So this will work with acetylene only?

So if I were to braze 3/16 solid rod, I would need 3/16 bronze flux coated rod?

[LtBadd]

Go HERE and click on the Filler Metal Selection Chart for the brazing filler and flux to use

[rcairboater]

I don't want to use silver solder. Thank you for the link though. Silver solder is too expensive.

[tapwelder]

Maybe, maybe not. Air/acetylene will likely require more heat input for bronze alloy than silver. More heat input equals more gas consumption.
Also, what joint design matters.

I as a standard use 1/8 bronze rod for most applications. And 1/16" silver at 45 percent.

[milomilo]

On that small of tube I would use 1/16" brass rod.

[OPUS FERRO]

rcairboater

. . . I have a acetylene turbo torch . . .

What is - 'a acetylene turbo torch' . . . ?


Opus

[Kelvin]

I don't have a "turbo" torch, so I don't know how hot they get, but I have an air-acetylene torch, and I tried brazing with it just for grins. All I can say is, "better pack a lunch," because you're gonna be there for a while, depending on the size/thickness of your base metal. I'd go with the smallest filler size I could find. And if you're concerned about the HAZ, this may not be the way to go, because everything is gonna get good and HOT for a good distance from the braze joint, by the time you get the joint area hot enough for the brass/bronze to flow.

Personally, I would always use O/A rather than air-acetylene, since I have an O/A rig...you can get in and get out in less than half the time with O/A.

[danielplace]

rcairboater

What is - 'a acetylene turbo torch' . . . ?

Opus

It could actually be the brand Turbo Torch or any brand with a noisy swirl tip is often referred to as a "turbo torch".

>>>>

Air/Acetylene is not what you want especially a turbo torch. As mentioned it will take way too long to heat to temperature. Just went through this yesterday. Tried a turbo first and it wasn't concentrated enough to get metal hot enough to melt the bronze filler. Moved to Miller air/acetylene with single cone quiet tip and that was better but clearly not what is needed for brazing with bronze and while it did work I should have used Oxy/acetylene for sure. Thought I could use air/acetylene to use less heat and actually it ends up heating the entire piece so much more than just using oxy/acetylene because it takes forever. The pieces were really thin. Can't imagine trying with something with any thickness.

[Hobbytime]

rcairboater



What is - 'a acetylene turbo torch' . . . ?


Opus

gee mr know it all doesnt know what a turbo torch is.. go google it....

[Hobbytime]

Thank you for responding. So this will work with acetylene only?

So if I were to braze 3/16 solid rod, I would need 3/16 bronze flux coated rod?

this type brazing rod will work well with a turbo torch, a little bit goes a long way, if your using it on steel you will need to use a flux for brazing, on copper or brass you dont, but it wets in better if you do...I do alot of brazing of steel to steel, steel to copper and this works well with just a turbo torch either acetylene or map gas...

https://www.amazon.com/Harris-Stay-S...VRMM0BK0RXAEX3

[CAVEMANN]

Personally I dislike prefluxed rod, I would use 1/16 bronze with a can of flux, I think you will be much happier with the bare rod, I think it flows better/easier and you can control the fluxing action better.

[txcarbuilder]

Not trying to hijack the thread but can you braze with propane/oxy or do you need acetylene?

[danielplace]

Not trying to hijack the thread but can you braze with propane/oxy or do you need acetylene?

You can braze just can't weld with it.

[OPUS FERRO]

danielplace

Air/Acetylene is not what you want especially a turbo torch. As mentioned
it will take way too long to heat to temperature.

The pieces were really thin. Can't imagine trying with something with any
thickness.

Hobbytime

gee mr know it all doesnt know what a turbo torch is.. go google it....

My query = a 'Red Herring' AKA - Fishing . . .

You swallowed the hook - all the way to your Vent - I set the hook . . .
and pulled your Brains all the way forward to your Eyeballs . . .

Metal: type/gauge - dictates torch type/heat = filler type . . .


Opus



ps -

I first observed - a 'turbo torch' when the 'Cast-Iron Turd-Tubes' were
rerouted under our house [concrete slab] to connect to the city sewer.

I vividly remember the lead pot and pour [1960] . . .

[Hobbytime]

danielplace




Hobbytime


My query = a 'Red Herring' AKA - Fishing . . .

You swallowed the hook - all the way to your Vent - I set the hook . . .
and pulled your Brains all the way forward to your Eyeballs . . .

Metal: type/gauge - dictates torch type/heat = filler type . . .


Opus



ps -

I first observed - a 'turbo torch' when the 'Cast-Iron Turd-Tubes' were
rerouted under our house [concrete slab] to connect to the city sewer.

I vividly remember the lead pot and pour [1960] . . .

blah blah blah..and you just swallow...as always you contribute nothing......but you have a hell of a good day.....

[Bonzoo]

Heres a turbo/henrob/cobra/name of the month/ hunk of pistol playing with oxygen and acet ......on thin crap

[Bonzoo]

No brass but good brain food

[danielplace]

Heres a turbo/henrob/cobra/name of the month/ hunk of pistol playing with oxygen and acet ......on thin crap

No brass but good brain food

Neither is the type of torch OP is asking about.

That isn't the turbo torch be referred. Air/acetylene (one tank and atmosphere).

[jeffrey.penfield]

Has Opus ever complemented anyone? And can anyone understand his comments? Does it appear that he is hallucinating when he writes that stuff?


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[Bonzoo]

Neither is the type of torch OP is asking about.

That isn't the turbo torch be referred. Air/acetylene (one tank and atmosphere).

I'll take Opies side on this. Never heard of it and don't want to.
Oxy propane was like an ingrown toenail to me. Idiocy. Hire the cutting done

[G-son]

I don't want to use silver solder. Silver solder is too expensive.

Maybe it is, maybe it isn't.
Bronze brazing rod has a relatively high melting point, you need a torch that can bring a large enough area of whatever you are trying to braze to cherry red. For me that usually means I need my O/A welder, as my hand held propane torches only can get very small items hot enough, and that's under ideal conditions. Acetylene is expensive, the oxygen costs a bit too.
Silver brazing rod with large amounts of silver melt many hundred degrees earlier, and unlike the bronze it likes tight joints that it can be sucked into by capillary action. This means you need way less rod for many joints, and a relatively small torch that burns really cheap propane often gets the metal hot enough.

Silver brazing rod is absolutely expensive. But so can the heating be, just like the time you spend doing the job, so when you factor everything in you may find that using silver brazing rod becomes cheaper. Especially if it's the difference between using a cheap propane torch and being forced to buy a O/A welder.

[Kelvin]

Good points, G-son, I agree. I might also add that a properly-done silver solder joint can be dam near as strong as the steel it joins, if not stronger...

And you can silver solder all day long with nothing more than air-acetylene.

[danielplace]

I'll take Opies side on this. Never heard of it and don't want to.
Oxy propane was like an ingrown toenail to me. Idiocy. Hire the cutting done

They are great when you need something a little milder than oxy/acetylene. This is a soft flame tip with defined flame cone that allows you to concentrate the heat the turbo torch tips do not have a single flame but rather a swirl tip multi flame. Very useful tool to have.

One tank, one valve and no need to adjust flame as it is neutral automatically.