Single metal structure
The entire geometry is made of contact alloy. Formability, bonding, heat path and alloy consumption must be verified for the complete part.
Bimetallic structure
The functional layer is placed on the switching surface and the body is made of a suitable alloy for support and connection. The thickness of the layer and the quality of the interface are among the controlled characteristics.
Trimetallic structure
Three alloy zones are defined for the working surface, the body and the joint zone. Joint integrity and rivetability should be checked along with switching performance.
Necessary items in the drawing
Head diameter and height, shank diameter and length, radii, concentricity, layer dimensions, alloys, surface condition and inspection criteria must be clearly controlled.
Practical summary
Any alloy, geometry, or corrective action decisions must be verified by controlled drawing and representative testing on the final assembly.
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