Nice job, brings back some money making memories in a operational emergency room on the 2" oxygen line. None of the older hands wanted to touch it. So I took care of it. Confined spaces suck up and around tight ductwork with a screaming rose bud. But I found that I had to feed the braze quicker to quench the joint as it was hard to control the heat in sich 9:45 tight quarters. But you nailed the lesson plan as far as I am concerned.
@djbnola1
8 ай бұрын
Thanks for watching and posting a comment.
@jdog4534
Жыл бұрын
That horizontal joint isn't 100% full. ..and where's the cap? What I've noticed when taking brazing test is that when people fail, it's usually the 11 - 1 o'clock position of the horizontal joint. Not the vertical up as one might think. That's because when you load up the first cup, then turn it upside down to braze the second cup, filler rod from the first cup will wick down across the coupling and fill it from the top. You'll notice that any cap you put on the first cup isn't as full as it was when you finished the first cup. The horizontal joint is hardest and many people get 100% penetration on one cup but will have holidays between 11 and 1 o'clock on the other cup. That's because when you fill the first cup, it unifies the tube and coupling and it acts as a heat sink, stealing the heat needed to completely fill the second cup. To solve that problem, crack open your acetylene a little more then adjust the oxygen accordingly. When I test, I go beyond cherry to bright orange and keep it moving there will be a quick sizzling before you burn through. If it sizzles, back off immediately and you might be ok. When pipe is orange hot you can see the effect of the rod pentrating the joint. Don't be fooled to believe that's the shadow of the melted rod. It doesn't represent actual penetration. It's the pipe being cooled off by the cooler molten filler rod. The shadow represents how much of the pipe has been slightly cooled off. Once the pipe has been totally purged, back the flow down to 5 or less. As long as there's a positive flow of N2, there's no reason for air to enter the system. Sometimes the jig used to hold everything together is too good and when the copper is heated, it expands too good of a seal and blocks N2 from escaping where it maybe was escaping from when the assembly was cold. It might try escaping through the molten filler leaving bubbles. Less purge helps control that issue. Before you bark off your torch, lick the back of your hand and pass it over the purge port to see if you feel the flow. Adjust the purge so you just feel it on the licked part of the back of your hand. Remember if there's not enough time to do it right, is there enough time to do it over? ...UA LOCAL 342 does it right the first time
@CDNguyen1990
6 ай бұрын
I’m instructing apprentices in a nearby local and I agree with you 100%. I hear too many people (and other journeymen and instructors) teaching about the shadow of the filler metal and I have always taught that it isn’t an indicator of the penetration as the pipe doesn’t become transparent. So I inferred that the “shadow” must be the cooling of the copper due to the cooler metal being introduced exactly as you said.
@cdays01
4 ай бұрын
I know it's been a year since this comment but I think it's the most helpful, by far. I just left the field to start up a High School vocational program within Local 166. It's been great and I'm trying to put a little bit of everything in front of these high schoolers so they can decide which side of the trades is for them. I really appreciate your explanation on this process. I wasn't doing enough hospital work and let my cert drop a few years ago. I was looking up videos as a refresher course. I just want the high schoolers to see the process for a day or two and move on. I'll be utilizing your details within my conversation. I like to teach the overkill style of brazing MedGas uses prior to simple refrigeration brazing because it's easier to water your training down a little for something not so critical but it's hard to amp up the details that medgas requires. I learned medgas first so when I did refrigeration everyone else would do a swipe/cap method and move on while I would push some filler into it prior to a cap. Good stuff. Thank you again from Local 166
@jdog4534
4 ай бұрын
@@cdays01 wow! Thanks for the positive feedback. I'm happy I was able to help a brother out. Good luck with your endeavors there. Is it something the UA is sponsoring or endorsing? These days, it's only the rich schools that still offer any kind of vocational training like this, where the kids are least likely to need to know. I think we share some of the same philosophy when it comes to brazing. I load the cup from 5 to 11 o'clock, going clockwise, then from 7 to 1 counterclockwise (I don't like to get to 12 before I know the rest of the cup is full, in case there's a cascade effect that could cause holidays), then 10:30ish to 1:30ish, then turn the torch down a little for the cap. I like to heat the rod about 2 or 3 inches from the tip so i can give it about a 45° bend in it. That way, no matter what position you're approaching from, you'll always be able to get the right angle on it. ..and I use 100% of every rod. Melting 2 rods together end to end doesn't have to be a big production. You can do it on your ladder. Hold the tips of the rods together like chopsticks. Melt them together in that position. Then, while they're still hot, straighten them out right away. I don't mean to be preachy. I'm just thinking about things that might help. I learned how to braze back in jr high school, in the 70s (the late 70's, a'hem.. I'm not that old.. lol), then onto oxy acet welding and i still do a bit of it here at home. Did you know you can braze with copper wire? Use boric acid for flux. Termite poison is a great source of boric acid. Heat the wire briefly then dip it into the boric acid. ..and you can braze stainless steel if you use this kind of black brazing flux. Its really nasty stuff. Use in ventilated space. ..very well ventilated and avoid skin contact. Its very irritating. ..my point is that maybe you can save a few bucks by getting the kids acclaimed to using a torch by first brazing with 14 or 12 gage copper wire on some carbon steel coupons.. idk Thanks again for the positive feedback brother
@cdays01
4 ай бұрын
@@jdog4534 I’m going to try that brazing with wire out (outside the solder braze lab). We started a weld program about 3 years ago with high schoolers and it was very successful. So, they approached me with the idea to make our own general trades program. It’s been incredible. The junior can move right into a paid intern role their senior year and our contractors are eating it up. Out of my 20 students (40 next year) 3 were hired as apprentices and 13 were hired as interns for next year. I’m a year long screen process basically. The kids get great experience either way. Even if they decided it’s not for them they’ll be making 40% of journeyman wages while going to school. The community loves it, our members are finally sold on it, and the kids are gaining more than they ever could have from an in school program. Really great stuff going on at Local 166. Proud to be a part of it. Thanks again for the information. We don’t get to leave a lot in this world but passing on knowledge is a major gift we often take for granted.
@djbnola1
2 ай бұрын
Great comments jdog. We appreciate you viewing the video and providing the feedback. When you have time, please check out our NITC updated Medical Gas Brazing Video at kzitem.info/news/bejne/woakuKZ7roinn4Y and additional braze test information on our website at www.nationalitc.com under "Medical Gas Brazing Processes"
@david7334
4 жыл бұрын
I just got my certification today and soldering. Proud ua !
@djbnola1
4 жыл бұрын
Congratulations David on obtaining your Medical Gas 6010 Installer Certification. Please check our updated MedGas Braze Video at kzitem.info/news/bejne/woakuKZ7roinn4Y . Also, please visit nationalitc.com for additional information on other Piping Industry Certifications and Resources. Thanks for viewing and good luck with your career.
@jdog4534
Жыл бұрын
Right on brutha! UA all the way!
@carlfurman4299
8 ай бұрын
Good deal 👍
@mikemiguel5984
4 ай бұрын
would love to see an updated video as well as showing the penetration of the cup after its been cut open.
@djbnola1
4 ай бұрын
Hello Mike, we have developed a newer video and it is available on KZitem and the National ITC website at kzitem.info/news/bejne/woakuKZ7roinn4Y Please check it out. It does show the penetration after sectioning as well as a lot of other up to date useful information regarding compliant Medical Gas brazing. Thanks for the comment. dj@nationalitc.com
@vnesmuonnam
8 ай бұрын
Thank you
@tcudahey9550
5 жыл бұрын
I enjoyed the video. A couple of things to say:{1} there was no mention of cleaning the fittings or pipe prior to braze,{2} there was no mention of the amount of silver content in the brazing rods; copper pipe brazed to copper fittings need a different brazing rod than when brazing copper pipe to brass. Also, no flux is used when brazing copper to copper. However a flux is used when brazing copper to brass.{3} after the copper coupon was brazed and a thing strip was cut out, why did the instructor not show a close-up of that brazed joint?
@djbnola1
5 жыл бұрын
Thank you for viewing the video and for your comments. Yes, this video was made back when the Medical Gas Piping Industry was getting started. It is dated and it shows. However, it is still a great demonstration video, which is why we posted it. All of the items you address may be found in the NFPA99 and ASME BPV Section IX Codes, which are applicable to Medical Gas System Piping brazing. We have recently published a new updated video which addresses all of items you commented on, along with additional information on what to look for during inspection. The video and additional information may be found on the National ITC Corporation website at www.nationalitc.com. Thank you again for your comments and we hope you enjoyed the video.
@seanpoore500
3 жыл бұрын
@TCudahey, yes you are correct. Bcup filler wire is used when brazing copper to copper medical gas piping. Bag with flux is used when brazing dissimilar metals such as copper to bronze or brass. But even so this was a very instructional video on brazing a medical gas coupon for the asse 6010 installer certification.
@jdog4534
Жыл бұрын
Lol you seem like you know why we didn't see the bend test performed. He had way too much rod left for there to be enough rod to fill both cups. I doubt he even got full penetration at the 6 o'clock. You have to jam it in there hard so that you feel the contact of the rod against the edge of that coupling no matter how fast its melting. We always test with that liquidy 5% crap but use the 15% honey stuff on the job. I remember when the 15% was $30 a pound. Last time I checked, the 5% was $45 a pound and the 0% was $30 a pound. The 15% was around $150 a pound 😳
@dmills13F
2 ай бұрын
Heat rises in fluids. The saying, 'heat rises' has nothing to do with brazing/soldering. Heat travels through solids by conduction. We start at the bottom of fitings as a practice to form a dam to stop the filler material from flowing out.
@djbnola1
2 ай бұрын
Great observation and comments. I fully agree and from your comments, it sounds like you are brazing correctly. Thank you for watching and providing feedback. Please check out our NITC updated Medical Gas Brazing Video at kzitem.info/news/bejne/woakuKZ7roinn4Y and additional braze test information on our website at www.nationalitc.com under "Medical Gas Brazing Processes"
@vibecheck1990
2 ай бұрын
Heat, under the right circumstances, can and will rise
@sherwoodrogers4339
5 жыл бұрын
how old is this video
@djbnola1
5 жыл бұрын
Hi Sherwood, thanks for checking out the video. This one dates back to the early to mid nineties, as you can tell from the side burns and paisley print shirt. Please check out the updated version on the National ITC website. Www.nationalitc.com DJ
@konzialpha384
4 жыл бұрын
1. You don't need the welding glasses 2. Way too much heat 3. The result is carbon everywhere and a uneven result Not good.
@jdog4534
Жыл бұрын
I somewhat disagree. I mean that rosebud is the size I use when brazing 6"Ø. I would go down a size or 2 on the rosebud. But I usually braze with an almost neutral flame and heat until everything is bright orange then jam that rod in so I feel constant contact with the edge of the coupling. From 7 to 2 o'clock, then from 5 to 10 o'clock, then 3 to 11 then 9 to 1. Knock off that dingleberry then cap it. If no dingleberry then joint is starving. There won't be any carbon inside the pipe. It doesn't matter what the outside looks like. Not for the test. If you're putting up show pipe, then I would agree to take the time to make it look good but not at the cost of having holidays in the system that can harbor germs and whatnot. On big hospital or laboratory jobs where the med gas crew is 15 to 20 hands, it's been my experience that there are always 4 to 6 of them who have no business holding a torch but their work passes the pressure tests on jobs because you could forego the whole 100% full part and just cap it and it will hold 150 to 300 psi.
Пікірлер: 26