Fillet Torch Tip Size

[Eric B]

What size Torch Tip for Fillet Brazing? 

My current setup is a Harris #3 that I have used for a couple of lug frames. I purchased some 0.035 wall 4130 that I plan to do several "test" joint on.

Thanks,

Eric

[Michael Catano]

Someone wise once said something to the effect of "the right tip is the one that came with your torch."

m

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[Doug Fattic]

Most builders have different preferences for tip size.  I find that I prefer a Victor #0 (the same as a Harris #2 or .035”) tip when using acetylene and a Victor #1 (Harris #3 or .040”) when using propane when fillet brazing.  I just like very local heat control that is not effecting surrounding areas.  YMMV

Mark Stonich has a nice chart that compares different companies tip numbers to actual size here:  http://bikesmithdesign.com/Welding/tips.html 

Doug Fattic

Niles, Michigan   

[Jon Norstog]

I used to use a Victor 0, then I wore it out and got a 00 which is pretty good for both welding and brazing.  I've used larger tips but don't have much use for them for bicycle work.

Good luck!

jn

"Thursday"

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[Mark Stonich]

I use a Smiths AW205 which is only 0.001" bigger than your Harris #3. Others use much smaller tips because the tip size can be whatever works with your style of building fillets. I like low gas velocities for brazing. I get in close with a hot, neutral flame, but I don't keep the flame on the joint all the time. Each time I add bronze I turn the flame away from the puddle to let it start to solidify. As soon as the puddle gets "unshiney" I bring the torch back.

I took airframe welding classes back in '68. Welding 0.035 4130, using AW201 & 202 tips as you need high gas velocities when welding.

[Eric Doswell]

I use a Victor #2 for fillets. I won't rule out moving to a #3 at some point. Get in, get hot, and get out.
E

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[Mark Bulgier]

As several people have pointed out already, the flame size can be adjusted over a wide range, reducing the need for multiple sizes of tip.  Just don’t use the smallest tip that’ll work for fillet brazing, because it’s helpful to be able to start with a larger flame to pre-heat the heavier parts.  For example I’ll heat the BB shell by pointing the flame on the inside of the shell, before turning the flame down to begin filleting. 

 

You can do it all with the smaller flame, but it just takes longer, with no advantage.

 

I like  Smiths 204 on my AW1A, but a 203 or 205 would be fine also. That’s with O/A – go a size bigger with Propane.

 

Mark Bulgier

Seattle