Golf club head
A weight piece ( 14 ) containing 15 wt. % or greater of iron and tungsten, and having a specific gravity of 9 or larger, larger than a material of a head body ( 10 ) made of steel or pure iron, is joined to the head body ( 10 ) by welding.
1. A golf club head comprising:
a head body comprising a tungsten alloy which is formed by a casting process, said tungsten alloy comprising 15 wt. % to 70 wt. % of tungsten, 15 wt. % to 17 wt. % of iron, and 9 wt. % to 65 wt. % of nickel, and having a specific gravity of at least 9.
2. The golf club head according to claim 1 , wherein the head body is partially formed of the tungsten alloy.
3. The golf club head according to claim 2 , wherein the head body comprises a face plate formed of different material from the tungsten alloy.
4. The golf club head according to claim 1 , wherein said tungsten alloy part which is formed by casting process comprises a cast and a forged tungsten alloy part.
5. A golf club head comprising:
a head body; and
a weight piece joined to the head body, comprising a tungsten alloy comprising 15 wt. % to 70 wt. % of tungsten, 15 wt. % to 17 wt. % of iron and 9 wt. % to 65 wt. % of nickel, and having a specific gravity of at least 9.
6. The golf club head according to claim 5 , wherein said tungsten alloy part which is formed by casting process comprises a cast and a forged tungsten alloy part.
7. The golf club according to claim 5 , wherein said head body comprises stainless steel.
8. The golf club according to claim 5 , further comprising:
a face plate disposed on a side of said head body which is opposite to said weight piece.
9. The golf club according to claim 8 , wherein said face plate is formed on said head body by at least one of welding and caulking.
10. The golf club according to claim 8 , wherein said face plate is integrally formed with said head body by a casting process.
11. The golf club according to claim 8 , wherein said face plate comprises at least one of titanium and maraging steel.
12. The golf club according to claim 5 , wherein the specific gravity of said weight piece is larger than a specific gravity of said head body.
13. The golf club according to claim 5 , wherein said weight piece is joined to said head body by at least one of welding and caulking.
14. The golf club according to claim 5 , wherein said weight piece comprises a casting molded weight piece.
15. A golf club head comprising:
a head body comprising at least one of steel and pure iron; and
a weight piece comprising a tungsten alloy comprising at least 15 wt. % of iron and at least 15 wt. % of tungsten, and having a specific gravity of at least 9 which is greater than a material of the head body, the weight being joined to the head body by welding.
16. The golf club head according to claim 15 , wherein the weight piece comprises a casting molded weight piece.
17. The golf club head according to claim 15 , wherein the weight piece is exposed to outside, and a peripheral part of the weight piece is thinner than a central part thereof.
18. The golf club head according to claim 15 , further comprising protrusions disposed on a peripheral edge of said weight piece.
19. The golf club head according to claim 15 , wherein said weight piece forms a part of an outer shell of the golf club head and is exposed to the outside of the golf club head.
20. A golf club head comprising:
a head body comprising a tungsten alloy comprising 15 wt. % to 70 wt. % of tungsten, 15 wt. % to 17 wt. % of iron and 9 wt. % to 65 wt. % of nickel.
21. The golf club head according to claim 20 , wherein said head body is partially formed of said tungsten alloy.
22. The golf club head according to claim 21 , further comprising:
a face plate disposed on said head body,
wherein said face plate comprises a material different from said tungsten alloy.
23. The golf club head according to claim 22 , wherein said face plate comprises at least one material selected from the group consisting of titanium alloy and maraging steel.
24. The golf club according to claim 22 , wherein said face plate is formed on a peripheral edge of said head body by at least one of welding and caulking.
25. The golf club head according to claim 20 , wherein said tungsten alloy comprises a specific gravity of at least 9.
26. The golf club according to claim 20 , further comprising:
a corrosion-proof protecting film disposed over said head body.