Frame rail straightening....this way?

[Jbo2231]

Came across

on my YT feed....I have a fair bit of crushed frame rails to tackle in the future, and it looks like an alternative to drilling them out straightening them off-chassis, and welding them back on.
Am a bit sceptical about stretching (and hence weakening) them though

Any thoughts?

I have seen it a few times done with a slide hammer and stud welder.. personally I will just be cutting out and replacing my ones when it comes round to it.

 

[Jim Davey]

Maybe the client specifically asked for the original rails to be saved rather than a more cost effective chop out and replace job.

 

[arther dailey]

Interested in this, would it not be better to cut off the original box say 3/4 " down from floor pan,after bracing door frames, then weld in box similar to what he used as a former ? and if this was done would that be better/stronger than original or does it cause other problems safety/structural wise ? and re testing for road worthyness.?