Joint design welding dissimilar materials

Abstract

A joint site design for welding of a shaft has a tubular shape composed of a hard material with a hub having a flat shape composed of softer material. The shaft is joined by welding at a connection area located at an end face thereof to a connection area of the hub located at a radial shoulder thereof.

What is claimed is: 
     
         1 . A joint site comprising:
 a shaft having a first body with a tubular shape and being composed of a first material having a first hardness;   a hub having a second body with a flat shape and being composed of a second material having a second hardness that is less than the first hardness,   wherein the shaft is configured for joint-connection at a first connection area to a second connection area of the hub by welding.   
     
     
         2 . The joint site of  claim 1 , wherein the first connection area comprises an end face of the first body. 
     
     
         3 . The joint site of  claim 1 , wherein the second connection area comprises a radial shoulder of the hub. 
     
     
         4 . The joint site of  claim 3 , wherein the second connection area is located a predetermined distance from the inner circumference of the hub. 
     
     
         5 . The joint site of  claim 4 , wherein the predetermined distance is greater than the thickness of a protrusion of melted material of the hub at the second connection area. 
     
     
         6 . The joint site of  claim 5 , wherein the protrusion is spaced a second predetermined distance and the inner circumference of the hub. 
     
     
         7 . The joint site of  claim 6 , wherein the first predetermined distance is greater than the second predetermined distance. 
     
     
         8 . The joint site of  claim 1 , wherein:
 the first connection area comprises an end face of the first body; and   the second connection area comprises a radial shoulder of the hub.   
     
     
         9 . The joint site of  claim 8 , wherein the second connection area is located a predetermined distance from the inner circumference of the hub. 
     
     
         10 . The joint site of  claim 9 , wherein the predetermined distance is greater than the thickness of a protrusion of melted material of the hub at the second connection area. 
     
     
         11 . The joint site of  claim 10 , wherein the protrusion is spaced a second predetermined distance and the inner circumference of the hub. 
     
     
         12 . The joint site of  claim 11 , wherein the first predetermined distance is greater than the second predetermined distance. 
     
     
         13 . The joint site design of  claim 8 , wherein the surface of the end face of the shaft is flat and perpendicular to the longitudinal axis of the shaft. 
     
     
         14 . The joint site design of  claim 8 , wherein the surface of the end face of the shaft is flat and inclined relative to the longitudinal axis of the shaft. 
     
     
         15 . The joint site design of  claim 8 , wherein the end face of the shaft has a conical cross-section. 
     
     
         16 . The joint site design of  claim 1 , wherein joint sites of joining members on a composite workpiece, after the welding, are arranged at an angle of between 10° to 20° to one another. 
     
     
         17 . The joint site design of  claim 1 , wherein joint sites of the joining members on the composite workpiece, after the welding, are arranged at an angle of 15° to one another. 
     
     
         18 . The joint site design of  claim 1 , wherein the hub and the shaft are components of a clutch. 
     
     
         19 . The joint site design of  claim 1 , wherein the joint site is configured for use in a transfer environment and automatic transmissions. 
     
     
         20 . A joint site comprising:
 a first body having an end face, the first body comprising a first material having a first hardness;   a second body having a radial shoulder, the second body comprising a second material having a second hardness that is less than the first hardness,   wherein the first body is configured for joint-connection at the end face to radial shoulder of the second body by friction welding.