I don’t know if your company carries and promotes the use of dry nitrogen, but it is a must whenever a service tech is brazing refrigerant lines. Unfortunately, too few are using it today.
Yes, the tanks are heavy and they take up a lot of space, but believe me, you wouldn’t want anyone doing brazing on your home or company air-conditioning or refrigeration system without it. Why not? Because wherever oxygen is present in the brazing process, a lot of system-destroying contamination is created. Try heating some copper tubing with a torch and see what happens.