CrazyOatmeal Posted June 17, 2021 Share Posted June 17, 2021 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. Link to comment Share on other sites More sharing options...
LeeJustice Posted June 17, 2021 Share Posted June 17, 2021 Maybe this will help https://www.weldability-sif.com/media/sif_tips/sif_tips_07_bronze_welding_brazing.pdf Link to comment Share on other sites More sharing options...
ThomasPowers Posted June 17, 2021 Share Posted June 17, 2021 Crumbling and falling apart seems to be the last stage before reaching brazing temp when I forge braze. More heat! Link to comment Share on other sites More sharing options...
Frosty Posted June 17, 2021 Share Posted June 17, 2021 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. Link to comment Share on other sites More sharing options...
arftist Posted November 13, 2021 Share Posted November 13, 2021 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... Link to comment Share on other sites More sharing options...
Gazz Posted April 16, 2022 Share Posted April 16, 2022 Do your brazing rods have flux on them? Link to comment Share on other sites More sharing options...
BillyBones Posted April 19, 2022 Share Posted April 19, 2022 Gazz, you can buy them with or with out flux. Link to comment Share on other sites More sharing options...
Scott NC Posted April 22, 2022 Share Posted April 22, 2022 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. Link to comment Share on other sites More sharing options...
arkie Posted April 22, 2022 Share Posted April 22, 2022 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. Link to comment Share on other sites More sharing options...
Scott NC Posted April 22, 2022 Share Posted April 22, 2022 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. Link to comment Share on other sites More sharing options...
ThomasPowers Posted April 24, 2022 Share Posted April 24, 2022 I braze in a propane forge; it gets hot enough to melt steel; so brazing rod is not a problem. Link to comment Share on other sites More sharing options...
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