By doing so, weld current and force is focused into the small area of the projection, and heat is obtained from the resistance to the flow of the welding current. Due to this heat, the projections collapse and the parts are weld together. Another successful welding technique is capacitor discharge stud welding, which uses weld studs or specially formed bolts for welding instead of projections.
The definition of inert is slow or having no action or power to move. An example of inert is a slug that is standing still. having inertia; without power to move, act, or resist. tending to be physically or mentally inactive; dull; slow.
I think inertia is a powerful idea.The tendency of a body to resist any change in its motion (speed or direction).The other words to resist any change in its acceleration is called its inertia. Mass can be thought of as a measure of a bodyâs inertia.Inertia means reluctance to change. Inertia reduces a rate of change but cannot stop it. The inertia is the Newton's first law.