June 17, 20215 yr Weld Right - Sifbronze No. 1 Brazing Welding Rods 1.6mm x 20 Rods No matter what I try to braze, using mapp gas, my brass rods just refuse to melt. They get to a bright yellow almost white hot and then just crumble and fall apart.
June 17, 20215 yr Maybe this will help https://www.weldability-sif.com/media/sif_tips/sif_tips_07_bronze_welding_brazing.pdf
June 17, 20215 yr Crumbling and falling apart seems to be the last stage before reaching brazing temp when I forge braze. More heat!
June 17, 20215 yr Braze like you're soldering, bring the joint to high orange / low yellow (depending on the grade of rod) and start touching the end of the rod to the joint. When it melts and flows apply rod until it stops (sweating) being drawn into the joint. You don't melt brazing rod onto the joint, the joint MUST be hot enough to sweat the braze in and bond. Frosty The Lucky.
November 13, 20214 yr Braze like you are bronze welding. Mapp alone will not do. You also need oxygen. You need welding heat to bronze weld, soldering can be done with just mapp. Thus returns the battle...
April 22, 20224 yr Do you think thickness and joint type have anything to do with brazing with map gas? I've brazed lots of smaller mild steel things with mapp but never attempted anything of any size. I have a torch for that.
April 22, 20224 yr I believe this has been covered before here on IFI, but MAPP gas (and propane for that matter) does NOT get hot enough to properly braze in the normal sense. One has to use oxy/fuel (fuel being acetylene or propane). Soldering, a lower temperature process, can be done with either MAPP and/or propane.
April 22, 20224 yr I understand all that but I don't know what capabilities and equipment Crazyoatmeal has at his disposal nor what he's trying to braze. Obviously not an oxy/acetylene set up. I have used mapp many times, as I said, on small stuff. It's really great for remote locations. Never had anything fall apart yet. Actually, I think I silver brazed a part with mapp for a stirling engine I made, once, many years ago. At any rate thanks for clarifying and I shall bow out.
April 24, 20224 yr I braze in a propane forge; it gets hot enough to melt steel; so brazing rod is not a problem.
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