I think Al's advice is the "mildest method" Unless that beam is built-up, and then there may be even simpler methods.
The magic of making a beam move with a little heat is nothing new, but there are very few practitioners around who really know the art/science of doing it.
One of those practitioners has published a book that I keep on my desk.
Distortion Control by John P. Stewart
https://johnstewartbooks.weebly.com/distortion-control.html