GMod animators usually input between 1000-2500 on props welded to a ragdoll's hand(s) to simulate throwing.
This defines the amount of force needed to break the weld between the objects (and/or world).
The weld tool as a variable called Force Break Limit. Both ragdolls and props can be welded into the world (floor, ceiling, walls, ect.) Ragdolls can also be welded to other ragdolls and/or props. Objects can be welded when they are not even touching. Shooting one with the gravity gun will cause both to move as usual. As a result, picking up one of the objects with the physgun will cause both to rise. It takes two props at player defined locations and puts them together as one. Weld is one of the most used tools ingame.