... widely used in the oil industry production: Rod, geological drill pipe; automotive industry production: Shock Absorber, gas spring, engine valve ... tools; available to the market: a continuous drive friction welding machine: C25, C50, C100, C200, C250 , C320, C500, C630, ... C800, C1200 b, inertial friction welding machine: CG63 c may, in accordance with the specific requirements of ...