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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!

This is technology of 1970 year. I think today it is not used

AGA...great stuff, no matter how old the video is,,,,thanks We Love Welding.....Paul in Orlando, Florida USA

no comments? you guys are sharing wonderful information...Bravo

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'm a journeyman steel fabricator, good video ......

This sure looks old

Industrial art.

Hur kan man läcksöka med läckspray utan att öppna flaskventilen först och trycksätta systemet? Dåligt redigerad video som inte kontrollerats av kunnig personal.

Great presentation

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.

I'm going to try to flame straighten my wife out tonight , thank guys👍

The voice says kill , must obey the voice, must obey the voice.

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’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.

welding is just app now

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

That is actually so Beautiful

I’m not a welder and probably will never have any kind of use for this but this is so cool

very interesting

German video, logic, utilizing material at the max. Us doesn't use this method for US squids. damn decks look like the were installed by gorillas on meth. And as a personal experience i watched a guy ill name Tbone drill a hole through a birthing deck into a full tank... anyone wanna guess what he did to repair a hole in a tank that pressurizes with fuel where navy squids sleep??? If you guessed he screammed give me the damn Bondo you are correct! Not joking he had a honecomb bulkhead on the floor drilling straight down without backing. Bunch of freakin idiots if you ask me.

My 1cm rod also extends lengthwise

Yup good stuff from Sweden

This is a game changer

I wonder whether "water quenching" is routinely used with flame straightening routinely.

The thumbnail is humorous

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.

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.

I live in the same place where AGA and Dalén is..

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 CZcams video and suddenly be able to pull this off. Stick with it, read, gain some more understanding, and you will get better.

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.

I just love old corporate training videos. They are always 99% meat 1% fat. These days, anything on CZcams wastes at least 50% of your time with sponsors, ads and trying to be funny or cool instead of just informative.

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.

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

Can’t believe I added this video to watch later

Also wtf why does metal contract more than expands ??

This video learned me something totally new i never knew.

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.

12:25

Excellent training info -- should the pipe bending have had a constraint?

this looks like a video a science class would watch on a CRT tv in the classroom in the 90's

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.

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.

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.

Great video!

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

if it contracts with at least 2 tons worth of force, how much does that same material expand when evenly heated

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'm a welder and this information is very important for me

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