Excellent video. I worked at a company that used to build and repair semi-trailers. We had one come in that had been rolled in an accident. I watched in awe as one of the old guys went to work on the 24" deep chassis rails with a torch and a wet rag... two days later the 45 degree lengthwise twist was gone, and it was as good as new. in all directions Watching that guy unscrew this huge chunk of twisted, bent steel was mind blowing. Pure skill. And for those commenters that think this doesn't work, or that say they have tried it and it didn't work for them, try to remember that there is a great deal of skill, experience, and understanding required to do this well. Don't expect to be able to watch a TH-cam video and suddenly be able to pull this off. Stick with it, read, gain some more understanding, and you will get better.
These old ones have the genuine feel to it. Props to the one picking the tunes in the intro in one minute mark 😂. Modern films would not even be made, but if so, it would be full of warning signs
I used to work for a company that builds and services centrifuges for the waste treatment, food and oil recovery industries. Machines are built out of a magnetic grade of stainless for major structural components. Sometimes due to wear or high vibration issues we would have bores for bearings get out of round. We would use a similiar technique to shrink the high sides of the bore to bring it back into spec and eliminate boring and sleeving.
Yes, and what fun I had doing all the things pertaining to WELDING and PIPEFITTING. I'm Old now and can not do those things any more. Your Story just brought me back to the day's of youth. Thanks Mate for sharing this little part of your life with me. I really do appreciate it very much.
I've been working with metal a number of years... Although old, this is FANTASTIC information. Kind of wish I learned more about it years ago! Thank you!
A historical version of this was carried out in Newcastle upon Tyne in England. The famous arched Tyne Bridge was nearing completion of the arched shape but the two sides failed to meet up - it was a negligible amount but enough to prevent the two sides being joined. A series of bonfires were lit along the arched girders to alter the shape slightly. The series of fires created enough change and both sides could be joined together.
My father was the site manager of an AGA acetylene factory in Luleå, in northern Sweden. It was closed down due to a decrease in the demand for this type of gas. In my profession as a metal worker, I have used these methods to straighten out welded structures.
Working at a CMU production facility I observed a loaded palletizer drop from a substantial height deforming a 6 or 8 inch channel approximately 6’-7’ long approximately 4”. The company welder straightened it perfectly using an acetylene rosebud. I have attempted to do similar things but haven’t understood the various techniques sufficiently to be consistently successful. This video has been a huge help.
It’s about restraining the expansion while heating and then allowing the cooling material to naturally shrink when cooling edit: lol that’s what the video is about lol sorry I commented before watching
I used to build drivelines for a heavy equipment manufacturer and every driveline had to be checked after welding. I used a oxyacetylene torch and dial indicators and it didn’t take much heat to get those drivelines to snap into zero runout. It’s amazing that at least in thinner steel it doesn’t take much heat to have them move into place.
Brilliant. From other videos, I had the idea that resisting the expansion bending from heating was helpful, but flame straightening would still work without it. I was wondering why I wasn't getting good results. Now I know.
Subscribed immediately after seeing your channel name! I knew it would be my kind of channel before even watching the video. Watching the video just affermed my prediction. Thanks for the video!!!
This is awesome. I'm interested. We had nothing like this anywhere around me growing up. I feel like I've missed something. I've got to learn more. Awesome video.
We do this in fence building but instead of heat from flame we weld a bead on half till it gets where I need it may take 2 or 3 beads but works perfectly
Just a caution: Before applying any heat to any structural member, the type of the steel and its heat treated condition, to be so treated, had better be known. In which case the straightening temperatures must not exceed the final tempering temperature of the steel. To ignore this may seriously weaken the structure.
We’d put camber in huge bridge girders and straighten columns in our fab shop. We had 4 rosebuds on a Hugo that would walk the length of the column . Using LP would give us the heat.
I used this technique in AUTU-BODY WORK, also used it as a PIPE-FITTER and WELDER to Match Up PIPE JOINTS for High Quality Fit-Ups for Welding plus used to Straighten or Curve Pipe or Beams to meet certain fit-up criteria. Very good Video. Well worth watching. I saved a lot of Pipefitters Butt's by using this method when their Math was off. (LOL)
The arrows at 6:05 are wrong. Some parts of the beam are stretched and some are compressed. Somewhere in the middle the material is not subjected to any stress.
Such and informative video, if only oxy acetylene was easy to store and cheap i would use it so much...as a welder and lpg torch only go so far. Thanks for the upload, why don't they do these kind of videos anymore
Lpg/mapgas and oxygen is pretty close to oxy acetylene temp. Oxy lpg/mapgas can do everything but weld steel, something to do with the chemistry reaction when welding but doesn't seem to matter when cutting though.
There are electrical tools that use induction heating to create a coin-sized hot spot on the metal surface, much like what the workers were doing on the sheet metal. th-cam.com/video/rJXeD2_eLm0/w-d-xo.html
Typical of today’s wish washy attitudes in engineering,, the most important part to you was the lack of eye protection, secondary getting the job done and being competitive. There’s many companies gone out of business with excellent apparent safety records.
Since i didn't see much of it in this video, I'm guessing no. I'm sure on thin sheetmetal it is used more, also air guns are used to cool. Alot of the heavy ship weldments and heat treated steels would not benefit from quenching and could change the temper.
1 week and i go for my mig/mag level 1 practical exam :) .. that t-split pipe , on theoretical exam, they want me to write that the way to do it is pre-bend the larger pipe so that after welding the pipe straitens .. flame straitening seems a much better solution to that particular scenario .. but im new so..
I didn't see you using any water like to pull a panel tight we would heat it and then take a hose and spiral our way to the center quickly causing it to contract and pull tight.
Easiest way to finish with a straight job is to set a bend in it before welding. Easy said than done because on a fresh job you had to guesstimate the bend that would take place the more you do it the better you get
sometimes you said expand, when you should have said shrink, when you cherry red heat the metal expands but as it cools it shrinks, if you apply water or a wet cloth it'll shrink more
I ask the OP. Maybe is a regional thing but every time you talk about sheet metal you say you are stretching it. By my understanding and what you show you are SHRINKING the spots not expanding them.
yes the result is it shrinks and put's tensile forces in to the piece . so " stretching" it . it's just like tightening a drum head . tensile force = stretch
I wrote a reply, but then I thought it was bullshit, so I deleted it. I've no idea mate 🤦🏻♂ Something to do with the movement of atoms at different temperatures? 🤷♂
Interesting language: the narrator says "the right equipment in the hands of _qualified_ personnel", instead of "the right equipment in the hands of _skilled_ personnel". One gives the credit to the employer, the other gives the credit to the worker.
I just love old corporate training videos. They are always 99% meat 1% fat. These days, anything on TH-cam wastes at least 50% of your time with sponsors, ads and trying to be funny or cool instead of just informative.
Great video. Ironically, found this while doing my bible study. Fascinating, considering you want your foundation beams to be straight. Luk 12:49-50 "I am come to send fire on the earth; and what will I, if it be already kindled? But I have a baptism to be baptized with; and how am I straitened till it be accomplished!"
i watched that for about 10 seconds and dont ever do that when you heat metal up you change the structure of the metal that makes it strong test it out for your self heat up a 1 foot bar red hot in the middle then let it cool down put it in a vice and try to bend it it will bend where you heated it up and no where else
And not only the type of steel but also what has been done to it previously. Cold rolled or drawn ? Sure ! Rebar - i.e. partially quenched steels of mild hardenability....sure. Thin section of mild steel that maybe got quenched at the mill and got a bit pearlitic....yep. But some giant bridge member that took half an hour to cool to black in the steel Mill ?? No way. That stuff is not getting any softer.
Only one flaw in this video - almost no information on methods on how to cool steel down after the heating process. As I understood, if you not cool it down, it will bend back.
Done right, it will not go back, so just letting it slow cool is fine. The hot area shrinks as it cools down and pulls in the direction you want it to go. Sometimes you may want to put it under some tension to prevent it from expanding in the wrong direction when heated (the weight of the metal can be plenty of force), you heat until soft so once you get that far it has no force to expand, and then it shrinks as it cools down = goes the direction you want.
@@ulfg1409 just recently I've been trying to straighten the HSS beam that bowed becose of the weld, and it pull it when I want it, but got back into almost the same state when cools off. So I had to put tremendous weight on the top of the beam, and use the cool air to cool it off so it won't go back and it helped
Christ broke your curse, disaster, the power of hell on the cross. Christ paid for all your sins on the cross and broke Satan's head. If you believe in Christ, you will be freed forever from sin, hell, and Satan's power and become a child of God. Believe in Jesus. He is God the Creator.
this video is pure garbage, youre not picking 2 tons up with that contraction. in fact your probably going to lengthen that rod if anything. 2 no one does this.... at all. a waste of time and money to flame straighten anything because while you can straighten it you are also severely weakening it. might as well just cut out whatever is bent and replace it for a 10th the cost.
Excellent video. I worked at a company that used to build and repair semi-trailers. We had one come in that had been rolled in an accident. I watched in awe as one of the old guys went to work on the 24" deep chassis rails with a torch and a wet rag... two days later the 45 degree lengthwise twist was gone, and it was as good as new. in all directions Watching that guy unscrew this huge chunk of twisted, bent steel was mind blowing. Pure skill. And for those commenters that think this doesn't work, or that say they have tried it and it didn't work for them, try to remember that there is a great deal of skill, experience, and understanding required to do this well. Don't expect to be able to watch a TH-cam video and suddenly be able to pull this off. Stick with it, read, gain some more understanding, and you will get better.
These old ones have the genuine feel to it. Props to the one picking the tunes in the intro in one minute mark 😂. Modern films would not even be made, but if so, it would be full of warning signs
I used to work for a company that builds and services centrifuges for the waste treatment, food and oil recovery industries. Machines are built out of a magnetic grade of stainless for major structural components. Sometimes due to wear or high vibration issues we would have bores for bearings get out of round. We would use a similiar technique to shrink the high sides of the bore to bring it back into spec and eliminate boring and sleeving.
Yes, and what fun I had doing all the things pertaining to WELDING and PIPEFITTING. I'm Old now and can not do those things any more. Your Story just brought me back to the day's of youth. Thanks Mate for sharing this little part of your life with me. I really do appreciate it very much.
That's incredible and almost hard to believe!
I wouldn’t of thought so as wear does not equal bent
I've been working with metal a number of years... Although old, this is FANTASTIC information. Kind of wish I learned more about it years ago! Thank you!
A historical version of this was carried out in Newcastle upon Tyne in England. The famous arched Tyne Bridge was nearing completion of the arched shape but the two sides failed to meet up - it was a negligible amount but enough to prevent the two sides being joined. A series of bonfires were lit along the arched girders to alter the shape slightly. The series of fires created enough change and both sides could be joined together.
Bad ass history fact
My father was the site manager of an AGA acetylene factory in Luleå, in northern Sweden. It was closed down due to a decrease in the demand for this type of gas. In my profession as a metal worker, I have used these methods to straighten out welded structures.
What a wonderful well-made video! I know it's older but this was VERY easy to understand!
The good stuff never changes...
@@toodle171 yes it does
Very clear info on a little known process . 👍
wtf?? iv worked with metal all my life how in the hell is this the first time im hearing about this..??? thanks for the video guys
One of the hottest days of the year and I was doing this today, straightening a 50mm plated beam with a 30mm camber
Working at a CMU production facility I observed a loaded palletizer drop from a substantial height deforming a 6 or 8 inch channel approximately 6’-7’ long approximately 4”. The company welder straightened it perfectly using an acetylene rosebud. I have attempted to do similar things but haven’t understood the various techniques sufficiently to be consistently successful. This video has been a huge help.
It’s about restraining the expansion while heating and then allowing the cooling material to naturally shrink when cooling edit: lol that’s what the video is about lol sorry I commented before watching
This is one of if not the best vids ive ever seen on the topic. Well played and Thank you!
This video learned me something totally new i never knew.
been doing metal fab all my life and this is the first time i've heard of this technique. interesting.
This is a type of work people dont know much about it, even me this video blew my mind for real. These people are artists.
I used to build drivelines for a heavy equipment manufacturer and every driveline had to be checked after welding. I used a oxyacetylene torch and dial indicators and it didn’t take much heat to get those drivelines to snap into zero runout. It’s amazing that at least in thinner steel it doesn’t take much heat to have them move into place.
Same when straightening boat prop shafts
@@chrisbanning413 yep👍
Can’t believe I added this video to watch later
Brilliant. From other videos, I had the idea that resisting the expansion bending from heating was helpful, but flame straightening would still work without it. I was wondering why I wasn't getting good results. Now I know.
Subscribed immediately after seeing your channel name! I knew it would be my kind of channel before even watching the video. Watching the video just affermed my prediction. Thanks for the video!!!
I'm a welder and this information is very important for me
This is awesome. I'm interested. We had nothing like this anywhere around me growing up. I feel like I've missed something. I've got to learn more. Awesome video.
this looks like a video a science class would watch on a CRT tv in the classroom in the 90's
We do this in fence building but instead of heat from flame we weld a bead on half till it gets where I need it may take 2 or 3 beads but works perfectly
I did this for over a year at Newport News ship yard building an Aircraft Carrier. Talk about some long and slow days.
yah sounds like really boring work.
Excellent video, thanks for sharing. 👍🏼
I wish I had learned this earlier! Would've helped out for sure
Just a caution: Before applying any heat to any structural member, the type of the steel and its heat treated condition, to be so treated, had better be known.
In which case the straightening temperatures must not exceed the final tempering temperature of the steel.
To ignore this may seriously weaken the structure.
Fantastic content, thanks for sharing.
Informative and appreciated, thanks for posting this. Has me subscribing.
I'm a journeyman steel fabricator, good video ......
wow that was awesome. What a lucky break a querk of metal helps manufacturing to get out of jail cheap on jobs. I find it fascinating.
We’d put camber in huge bridge girders and straighten columns in our fab shop. We had 4 rosebuds on a Hugo that would walk the length of the column . Using LP would give us the heat.
I used this technique in AUTU-BODY WORK, also used it as a PIPE-FITTER and WELDER to Match Up PIPE JOINTS for High Quality Fit-Ups for Welding plus used to Straighten or Curve Pipe or Beams to meet certain fit-up criteria. Very good Video. Well worth watching. I saved a lot of Pipefitters Butt's by using this method when their Math was off. (LOL)
Great video!
It mentioned an "AGA" handbook any idea if its availble for purchase ?
I wish this was shown to me years ago!
That is actually so Beautiful
Great presentation
This is excellent!
The arrows at 6:05 are wrong. Some parts of the beam are stretched and some are compressed. Somewhere in the middle the material is not subjected to any stress.
Awesome technique
like how u include the bending as well would be nice to learn that
Such and informative video, if only oxy acetylene was easy to store and cheap i would use it so much...as a welder and lpg torch only go so far.
Thanks for the upload, why don't they do these kind of videos anymore
Lpg/mapgas and oxygen is pretty close to oxy acetylene temp. Oxy lpg/mapgas can do everything but weld steel, something to do with the chemistry reaction when welding but doesn't seem to matter when cutting though.
There are electrical tools that use induction heating to create a coin-sized hot spot on the metal surface, much like what the workers were doing on the sheet metal.
th-cam.com/video/rJXeD2_eLm0/w-d-xo.html
8:27 One of my favorite shots of it!
Awesome video! I feel bad for the guy at Lavateck. No eye protection.
Typical of today’s wish washy attitudes in engineering,, the most important part to you was the lack of eye protection, secondary getting the job done and being competitive. There’s many companies gone out of business with excellent apparent safety records.
I wonder whether "water quenching" is routinely used with flame straightening routinely.
Since i didn't see much of it in this video, I'm guessing no. I'm sure on thin sheetmetal it is used more, also air guns are used to cool. Alot of the heavy ship weldments and heat treated steels would not benefit from quenching and could change the temper.
Thank you.
Uwe is Gustavo Valecillos I have years trying to faind yourself now I found you great friend
I'm going to try to flame straighten my wife out tonight , thank guys👍
Great video Thanks
This is a game changer
1 week and i go for my mig/mag level 1 practical exam :) .. that t-split pipe , on theoretical exam, they want me to write that the way to do it is pre-bend the larger pipe so that after welding the pipe straitens .. flame straitening seems a much better solution to that particular scenario .. but im new so..
I didn't see you using any water like to pull a panel tight we would heat it and then take a hose and spiral our way to the center quickly causing it to contract and pull tight.
if it contracts with at least 2 tons worth of force, how much does that same material expand when evenly heated
I came to this info video. I see myself playing this in front of my class if i ever become a "welder teacher"! Lol
you are a welder? is that you in the pic?
Perv
Should you use water to cool it? or will you get better results from letting it naturally cool?
It will harden if you cool it with water, and lose its quality.
I think if you let it cool naturally it will go back how it was, and you don't want that. You can also cool with the air, use the air compressor.
@@Esarix not all metals would harden if quenched... Mild steel won't. Copper would soften (or rather anneal)
@@Esarix -- Could you then "anneal" it with re-heating to a lower temperature?
What is the method to fix a twisted boom on a tractor backhoe at the bucket area?
Great video
Thanks
Excellent training info -- should the pipe bending have had a constraint?
Best video
does anyone have the name or a link of the original soundtrack, in the first minute?
Cant forget the old school ways of doing things
Easiest way to finish with a straight job is to set a bend in it before welding. Easy said than done because on a fresh job you had to guesstimate the bend that would take place the more you do it the better you get
Yup good stuff from Sweden
sometimes you said expand, when you should have said shrink, when you cherry red heat the metal expands but as it cools it shrinks, if you apply water or a wet cloth it'll shrink more
No it won't. Watch the video again.
My 1cm rod also extends lengthwise
thanks i like all of videoes
I could imagine a combination of 3d scanning and computer calculations could be handy
I ask the OP. Maybe is a regional thing but every time you talk about sheet metal you say you are stretching it. By my understanding and what you show you are SHRINKING the spots not expanding them.
yes the result is it shrinks and put's tensile forces in to the piece . so " stretching" it . it's just like tightening a drum head . tensile force = stretch
Also wtf why does metal contract more than expands ??
I wrote a reply, but then I thought it was bullshit, so I deleted it. I've no idea mate 🤦🏻♂ Something to do with the movement of atoms at different temperatures? 🤷♂
It can make better job preheat before weld make more greater than post-heat
very interesting
Now do a video on metal temper and how heating can change it.
Interesting language: the narrator says "the right equipment in the hands of _qualified_ personnel", instead of "the right equipment in the hands of _skilled_ personnel". One gives the credit to the employer, the other gives the credit to the worker.
I just love old corporate training videos. They are always 99% meat 1% fat. These days, anything on TH-cam wastes at least 50% of your time with sponsors, ads and trying to be funny or cool instead of just informative.
I live in the same place where AGA and Dalén is..
at 2:40 it can be reversed by rolling or drawing but whatever
Industrial art.
Great video. Ironically, found this while doing my bible study. Fascinating, considering you want your foundation beams to be straight.
Luk 12:49-50 "I am come to send fire on the earth; and what will I, if it be already kindled?
But I have a baptism to be baptized with; and how am I straitened till it be accomplished!"
Or not, most roof beams have built-in bends so that under load they will be straight.
i watched that for about 10 seconds and dont ever do that
when you heat metal up you change the structure of the metal that makes it strong
test it out for your self heat up a 1 foot bar red hot in the middle then let it cool down put it in a vice and try to bend it
it will bend where you heated it up and no where else
It depends on the type of steel.
And not only the type of steel but also what has been done to it previously. Cold rolled or drawn ? Sure ! Rebar - i.e. partially quenched steels of mild hardenability....sure. Thin section of mild steel that maybe got quenched at the mill and got a bit pearlitic....yep. But some giant bridge member that took half an hour to cool to black in the steel Mill ?? No way. That stuff is not getting any softer.
@@joashparker8271 no it dont
@@Zonkotron nope you heat it its messed up after that test it your self
Stainless bends way more than standard "black" steel when you heat/weld it. :z
Turbojuugend never seizes to amaze me how much it moves
@@kmccurdy21 I once welded a ladder from stainless tube. Omg the bendz 😱
Why does he say acetylene so weird?
sounds correct to me. are you from the south or west ? how do you say it.?
14:04 A Set Ah Lean
I was thinking the same thing 😂
12:00
7:44
11:26
Sick shit
Diarrhea?
@@danl.4743 no, that's slick shit
Only one flaw in this video - almost no information on methods on how to cool steel down after the heating process. As I understood, if you not cool it down, it will bend back.
Done right, it will not go back, so just letting it slow cool is fine. The hot area shrinks as it cools down and pulls in the direction you want it to go. Sometimes you may want to put it under some tension to prevent it from expanding in the wrong direction when heated (the weight of the metal can be plenty of force), you heat until soft so once you get that far it has no force to expand, and then it shrinks as it cools down = goes the direction you want.
@@ulfg1409 just recently I've been trying to straighten the HSS beam that bowed becose of the weld, and it pull it when I want it, but got back into almost the same state when cools off. So I had to put tremendous weight on the top of the beam, and use the cool air to cool it off so it won't go back and it helped
@@TriptychVNS Never heat HSS. Second you do that you changed it's properties and is no longer rated for the application.
@@ShainAndrews HSS is not high strength steel. it means Hollow Steel Section.
@@ronblack7870 Doh... You are correct... so am I. But you are on topic where as I went off into the rhubarb.
AGA now Linde
welding is just app now
a-set-a-lean lol the narrator really over pronounces some of these words
Inglish flame
Christ broke your curse, disaster, the power of hell on the cross. Christ paid for all your sins on the cross and broke Satan's head. If you believe in Christ, you will be freed forever from sin, hell, and Satan's power and become a child of God. Believe in Jesus. He is God the Creator.
Jesus is the work of the devil. If you believe in Christ, you worship Satan.
this video is pure garbage, youre not picking 2 tons up with that contraction. in fact your probably going to lengthen that rod if anything. 2 no one does this.... at all. a waste of time and money to flame straighten anything because while you can straighten it you are also severely weakening it. might as well just cut out whatever is bent and replace it for a 10th the cost.
This is technology of 1970 year. I think today it is not used
9:39
곡직 합니까?
@@ulsanbest8467 대학 과제 때문에요..ㅎㅎ
12:25