Wheel lug studs makes the changing of tires easy by creating the ability to hold and locate the assembly in the changing of tire through lifting both tire onto the studs and also the wheel. The technician that states that torque-to-yield method is one of the primary method in replacing wheel lug studs is correct.
Wheel studs are threaded fasteners that holds on the wheel and doing re-torque of lug nuts that is fully assembled to the wheel stud is applied, then pull it a few times and seal it to secure the wheel. Then check the torque after a test drive to ensure safety.
Moreover, wheel studs are replaceable; it has two types, the press-in, and screw-in method. Nevertheless, the arc welder method is possible but unlikely to be used.