Method of making a titanium-containing golf club head and such head

Abstract

A method of making a golf club head and the head itself which club head has two or more portions. Each portion comprises metals of differing characteristics. One portion may be made of ductile metal to facilitate bending.

We claim:  
     
         1 . A method of forming a golf club head comprising 
 forming a first portion of the head including a hosel by casting such portion from a ductile metal, said first portion having a first connection surface;    forming a second portion of the head by casting such portion from a strong alloy, which second portion has a ball-striking surface and, a back surface and a second connecting surface between the ball-striking and back surfaces and thereafter    joining the two connecting surfaces of the two portions together to form such club head.    
     
     
         2 . The method of    claim 1    in which the first portion includes that portion of the head that is stressed when the head is torqued relative to the hosel to adjust the club head loft or lie angles.  
     
     
         3 . The method of    claim 1    in which the ductile metal is titanium with trace elements.  
     
     
         4 . The method of    claim 1    in which the strong alloy is a titanium alloy.  
     
     
         5 . The method of    claim 4    in which the titanium alloy includes aluminum and vanadium.  
     
     
         6 . A method of forming a golf club head which head includes a hosel portion and a body portion comprising 
 casting the hosel portion of material including titanium which material is ductile after casting,    casting the body portion of material including material which is strong after casting, and    positioning the two portions in abutting positions, and therefore joining such portions together.    
     
     
         7 . The method of    claim 6    in which the hosel material is commercially pure titanium and the body material is a titanium, aluminum and vanadium alloy.  
     
     
         8 . The method of    claim 6    in which the body material has 2.5 to 6.75% by wt. aluminum and 2 to 4.5% by wt. vanadium and the remainder titanium and trace elements.  
     
     
         9 . The method of    claim 6    in which the body material has 6% aluminum, 4% vanadium and the remainder titanium trace elements.  
     
     
         10 . A golf club head made by the practice of the method of    claim 1   .  
     
     
         11 . A golf club head made by the practice of the method of    claim 2   .  
     
     
         12 . A golf club head made by the practice of the method of    claim 3   .  
     
     
         13 . A golf club head made by the practice of the method of    claim 4   .  
     
     
         14 . A golf club head made by the practice of the method of    claim 5   .  
     
     
         15 . A golf club head made by the practice of the method of    claim 6   .  
     
     
         16 . A golf club head made by the practice of the method of    claim 7   .  
     
     
         17 . A golf club head made by the practice of the method of    claim 8   .  
     
     
         18 . A golf club head made by the practice of the method of    claim 9   .