Why does this gem has only 8.8k views?!! Awesome video, thank you!

Awesome information Alex! thank you so much. Regards from Mexico.

Excellent info! So refreshing to have someone who actually knows what they're talking about! I have a big stainless job coming up with built up triangular sections in stainless steel. I anticipate some distortion issues but knowing there is an option to heat straighten with the oxy torch gives me more confidence! Thanks a lot!

When i started metal fabricating 40 years ago i had old foreman teach me how to flame straighten. We would try to introduce the same amout of heat to the radius on both sides and cool rapidly with water. I used this technique throughout my career I found it to be fast and practical

This is an excellent explanation of the needed process to remove weld distortion. Thank you for such excellent content!

Freaking good content. More of this please.

I have heard about it several times, in rare cases it worked somehow. But this is the first time I really understood how the stress is created by this process and how to get to a good result - thank you!

I was taught that heat wedge is used in tandom with external forces , usually the weight of the part itself but also with jacks . you have to impead expansion to create a plastic deformation bulge, this bulge takes up linear space shrinking the part with forces well over 2 tons

Excellent demos with easy to follow explanations.

Fantastic video! Thanks for sharing your knowledge!

Excellent Information. I've learnt a lot from your video series. Thanks for sharing your knowledge.

Thanks for sharing, awesome good content!

This is neat! I don't really do welding and had previously only heard comments from friends that if you weld something it just always flexes uncontrollably. Getting to within 0.1mm at what, 100mm distance, is really impressive. I'm going to have to reconsider welding for some projects...

Hey Alex! Thanks for your seriess of videos regarding this matter. I found my self to have made square tube turned into bananas and through your videos and the comments below I used the TIG as you suggested and it works amazingly. It's hard to tell the color through the welding helmet but overall it's working. I didn't wanted to buy O/A only for this reason.

Thank you--tomorrow I shall try some of these techniques in my shop.

Thanks for the video,it was very usefull

thanks for sharing, very useful to me !!!

Excellent tutorial

Nicely done.

Good demo, thanks...

Good vid, but also see Keith Fenner on straightening shafts.

Hi Fif! Here, I do have to contradict you a bit: The wedge shaped heating actually does work perfect **if** the work is constrained. It will leave less residual stress compared to the method you showed at about minute 12. Now to the method you showed as the right one for non-constrained straightening: First pass was perfect. But the second pass should have heated up *between* the areas of pass one (thus on the flat side, opposed to the T welded on). This would have reduced the stress near the corners. The way you did it increased the the stress even more. To the flattening of train cars' walls: They do not heat up constrained, but yes, they do heat up a big area with a lot of torches. The cold areas do form a mesh-like structure that is the support/restriction. You could have straightened the sheet metal T you showed with just heating up spots. Not near the corner, but going in at about 1/3 of the width of the land. As you showed in part 1, heating up the same spot doesn't gain that much. But still, thanks a lot for all your efforts. I know, just writing the plot and editing takes way more time than the end result.

Thank you sir.

thanks, you set me straight. BTW when will they make a built-in piezo torch starter to eliminate the scratch starter.

Would it be possible for the hobbyist who doesn’t have oxy-acetylene equipment to flame straighten using one of the high temperature gases (eg Vortex MAP X) that are readily available for DIY use? Very, very impressive content. Thank you.

Masterclass sir

Can a quick cooling with compressed air work to shrink the material more in a area?

Is it possible (perhaps benificial) to use the TIG torch for straightening? I guess you can be even more specific with TIG for where you apply the heat?

Good Demonstration. May I know the exact name of that table which is used for assembly purpose.

Does this work on round steel pipe as well?

So the rapid heat expands a thin area, then the heat dissipates to the whole part.

Are you using a cutting tip, or a heating tip? 🙂

Hello, Thank You. I have very similar problem now , but I have a solid metal of 15 mm pieces . How much I need to heat . because I went quickly through it, but no effect. Maybe I need to heat it much more due to a thickness?

Hello Alex, could you please tell me what I can do to weld sheet metal that is one mm thickness. I only have a SMAW type that is transformer powered. Goes down to 20 amps with five amp increments. How would I weld stainless steel without using TIG ??? Thanks you Alex and peace to you too I really like your channel.

Ah I see, its hot and cold speed, then cool down slowly. Heat up to expand say to 2mm, but it cools down to move about 1mm leaving 1mm moved when at room temp.

I think your wedge might have been upside down

friend , the reason you have no success with the wedge is because they often use external forces in tandom so maybe you forgot they use the weight of the work piece to push the plastic deformation into position for the shrink ? Fantastic video by the way dont change a thing ...

You sound like Nikki lauda during his racing year i swear

3/4 of a tenth of a millimeter... LOL... Some of you might understand... Most wont........