like building steel beams. i'm pretty sure with a sawzall.
Yes, you can use a Sawzall. A ban saw or a cutting torch work too. But a cutting torch woudl leave a pretty rough edge.
I am going to take a slightly different approach. Once the structural steel is manufactured and then brought to the fabricator, not much heat is applied to the steel. It is normally punched, sheared or whatever buy the use of a lot of heat on it is normally not allowed due to the change in the properties of the steel. Once in the field to be erected, the cutting or welding on it are held to absolute minimums and most of the time not allowed at all.
Most I-beams are manufactured in a factory by rolling the red hot steel billet through several sets of rolls till the I-beam takes it's final shape. All we normally do to a factory stock I-beam is cut it to length, trim the ends, punch out the mounting holes and or weld on shear tabs. Some I-beams like tapered ones are built from scratch in the shop using plate steel. In fabricating in the shop, a plasma cutter or cutting torch is used along with a hydraulic plate shear. Repairs during erection, usually a cutting torch because you are several stories in the air. If the beam has to be taken to the ground, still a cutting torch because on a job site power availability is poor to connect a plasma cutter. Wingman
