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.
Definition of inert. 1  1 : lacking the power to move. 2  2 : very slow to move or act : sluggish. 3  3 : deficient in active properties; especially : lacking a usual or anticipated chemical or biological action.
inertia (inurÂ´shÉ), n according to Newton's law of inertia, the tendency of a body that is at rest to remain at rest and a body that is in motion to continue in motion with constant speed in the same straight line unless acted on by an outside force. inertia. inactivity, inability to move spontaneously.