Method for the manufacture of hard surface layer on the automatic freight car coupler part

A method of creating a hard surface layer comprising the steps of:

• induction heating a section of a surface of a metallic part by moving a power coil proximate to the section of the surface;
• cooling the section that was heated with liquid emitted from a feed that is disposed proximate to the power coil and moves in concert with the power coil.

An apparatus for creating a hard surface layer comprising:

• a movable power coil comprising a tube that includes holes, wherein the power coil is capable of heating a surface and the holes are capable of feeding a liquid to the surface that was heated;
• an automatic control system capable of scanning the surface and directing motion of the power coil over the surface based upon the scanning.

A train car coupler comprising:

• a large tooth and a small tooth coupled to one another;
• wherein a section of a working surface of at least one of the large tooth or the small tooth is hardened to a range of 40.5 HRC to 50.0 HRC.