I just now learned more about basic utility brazing by watching this vid than I learned from reading a surprisingly good bit about it. Even with MAPP gas it takes longer than I would have expected,I had always heard to be extremely careful with MAPP gas as it can melt stuff unexpectedly! This vid was perfect to point me in the right direction. Thanks !🌞

You can braze in open air with mapp under the right conditions. The limitations are how much heat the torch can input into the work, so burner /flame size is one element, work piece itself and ambient conditions i.e wind. flame shielding really helps, and size might be limited to something quite small e.g. 10mm round rod. I've used Rothenberger Super-Fire 2 on MAPP and even Rothenberger TURBOROP on propane. Bullfinch also do a brazing torch that can output enough heat off propane using a 4 bar regulator. If you have two burners running, size options improve. In answer to the question related to filling a hole the size of a nickel, don't fill the hole with bronze.. Use a piece of the same steel cut to fill the hole, and braze it in place. A brazed joint is very strong. Make sure surfaces are prepared carefully and use appropriate flux/filler rod (SifBronze).

Just a note after some time: if you need to braze bigger parts you can easialy build yourself a small enclosure for example in a 4litres can insulated using ceramic wool and refractory cement like a small forge and you can do bigger parts even using cheap gas. I drop mapp gas for usual brazing because is not budget friendly

I don't get the downvotes, it's just a video that shows you CAN braze with MAPP (or rather with pure propylene which is now being sold as the MAPP substitute.)

Arthouse cinema.

Re comments about MAPP (methylacetylene-propadiene, C3H4) vs. MAP-Pro (propylene, C3H6) vs propane (C3H8). The higher hydrogen content causes: 1. more water vapour, which takes away heat, 2. more air is needed, which dilutes the heat available. Both of these factors combine with the heat capacity of the gas, which for both MAPP and MAP-Pro is about 10% lower than propane. Overall, MAP-Pro is marginally better than propane. MAPP is much better, but since it can't be had, moot point. I still use MAP-Pro in a marginal situation, but it costs a lot more, so if I did a lot of brazing, I would favour using a larger/second torch, better insulation of the workpiece etc.

impressive

Got to echo other posts, this is not brazing, it's melting some brass onto steel. You need to join at least two pieces of metal TOGETHER to show brazing!

3:02 then TOUCH IT!

I tried but copper rod is not melting with mapp gas.

I’m not sure if you still answer questions. I need to fill a hole that a size of a nickel it’s steel can I use brass to fill the hole up and File back to diameter? How much load can brass takes before it gets wore out.

Is this mapp or map-pro ?

Uhhh, you think this is “brazing”? Melting brazing rod on a steel pin is not brazing…

yea I am asking the same question but what brand and were

can i mix the borax i use as a pest killer with water or alcohol to get a paste for flux or is it a different kind of borax? perhaps the stuff i have is mixed with other chemical and not good for using as a flux? btw i made a small oxy/propane torch like a jeweler uses,is it possible to braze small steel wire or sheet metal together using a small brass rod or coat hanger etc? is the flux necessary or can i still get a decent braze without it?

What kind of flux is that? And is that a brass rod or steel?

WTF, who really got anything from this apart from being pissed off watching a metal bar heated then having to watch it cool down ,why would you think anyone would benefit from this if you did benefit then you really should not be playing with a gas torch

Mapp gas work like just butane gas, It depends on torch. Im using butane hand torch and brazing brass rod. Its ok to spot brazing but for bigger parts big no no.