Patent ID: 7351163
Filing Date: 2008-04-01
Classification: A63B,Y10T

Abstract:
1. A golf club head comprising: a metal head body defining a hollow portion and an opening portion, the metal head body comprising a sole portion and a back portion; and a metal piece joined to the opening portion, wherein the metal piece includes tungsten alloy, and the following compositions based on the total weight of the metal piece: tungsten in a range of 28 wt %-32 wt %; iron in a range of 45 wt %-49 wt %; nickel in a range of 15 wt %-17 wt %; and copper in a range of 1 wt %-3 wt %; and wherein the sum of amount of tungsten, iron, nickel and capper in the metal piece is in a range of 93 wt % to 98 wt %, wherein the metal head body is made of stainless steel, and wherein the metal piece is directly welded to the metal head body and wherein the metal piece extends generally from a vicinity of a central portion of the sole portion or from a vicinity of a rear of a center of the sole portion or from a vicinity of the metal head body that is rearward of the sole portion to a side wall of a back portion of the metal head body.