How To Braze Cast Metal
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- Опубликовано: 10 фев 2025
- A complete beginner's guide to all the steps on how to braze cast metal.
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Very helpful and very informative useful video this week. Thank you so much. Can't wait to see more videos soon my friend. Keep up the great craftsmanship and hard work my friend. Forge On. Fab On. Weld On. Keep Forge lit. Keep Making. God Bless.
Thank you for the praise! Put a lot of effort into this one.
Personally I would’ve beveled it out quite a ways to get more surface for the brass to bite on. but otherwise it seems like your procedure is excellent
I had debated doing that as well. If the brass hadn't washed all the way through to the other side, I would have cut it out and done it again.
That brazed repair won't hold up to much stress. Don't put more weight than a mosquito wing on it. Also just because it was sand casted doesn't mean it is cast iron. It could be a cast steel part. Grind it a little and look at the sparks. Cast iron sparks look different than cast steel sparks.
It's held up for over a year+ and the client has been happy with it. If it can survive a bunch of high schoolers at a public school, I'd say I did a decent job.
Im confused. If cast iron breaks down with extreme heat, why take a torch to it?
Second question. Why fill it in with a very soft metal such as brass?
Good question. Welding brings a metal up to critical (melting) temperatures which for steel is about 2300 degrees F. This temperature is where the "break down" of cast iron occurs. Brass has a lower melting point of around 1700 degrees F which avoids damaging cast iron. Pre heating and slow post cooling is required because the cast iron will shrink or swell unevenly and cause it to crack.
Very nice, but I wish you would have talked a little more about penetration. Still a great video.
@buckygoldstein9256 Fair enough. Penetration is a bit strange with brazing. Since you're not bringing the base metal up to a critical temperature, you're not actually creating penetration in the same way as you would with welding. Instead, you want the brass to "seep" through in a similar way to soldering. Thank you for watching.
@@steelforestweldingandforge Don't get me wrong. I found the video very informative. I've never brazed cast iron, but I have brazed lugged bicycle frames, which is sort of like sweating pipes (but with brass and steel). With bicycles penetration is very important for strength. I was watching the video because I'm contemplating brazing a broken vise, using nickel silver rod. I'm not sure how that will work, but I'm sure that penetration will be important with that also. ;-)
Welding rods do not lose their tensile strength from being left out.
Not trying to be mean, but that is not a solid repair. The braze needs to fully wet into the joint. Both sides. You really shouldn’t be instructing people on RUclips if you dont have the experience to do so.
I will fully admit to not being a complete expert with brazing. I don't have a problem with admitting my faults.
But welling rod's most absolutely do lose their tensile strength from bad storage conditions.
I'll refer you to AWS D1.1
I look forward to see your brazing instructional video.
@ You oversimplify with your statement in the video that welding rods lose their tensile strength because of improper storage.
Contamination of the weld because of the condition of the flux or surface rust on the rod is what would cause the weld to not achieve the desired strength due to porosity or contamination/inclusions in the weld bead.
This may have been what you were saying but you really need to expound on that and give the reason WHY if you are going to get on RUclips and try to teach others that know slightly less than yourself.
As for my videos on brazing.. Why? There are a hundred other videos of actual competent welders and machinists providing basic and advanced instruction on this very subject.
I have nothing to prove. I just don’t like seeing people who are not qualified trying to act as though they are. Sorry if that hurts your feelings.