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  Golf club head and its manufacturing methodUSPTO Application #: 20060135286Title: Golf club head and its manufacturing method Abstract: A golf club head includes a first metallic member, a second metallic member having different thickness from the first metallic member, and a part where the first and second metallic members are welded by plasma welding, laser welding or electron beam welding. A gap between the first and second metallic members is filled up with another metal material besides the first and second metallic members. (end of abstract) Agent: Sughrue Mion, PLLC - Washington, DC, US Inventors: Yasunori Imamoto, Hisashi Yamagishi, Hideo Matsunaga USPTO Applicaton #: 20060135286 - Class: 473342000 (USPTO) Related Patent Categories: Games Using Tangible Projectile, Golf, Club Or Club Support, Head, Striking Face Insert The Patent Description & Claims data below is from USPTO Patent Application 20060135286. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a golf club head having a part where the metallic members with different thickness are welded by plasma welding, laser welding or electron beam welding and its manufacturing method. [0003] 2. Description of the Related Art [0004] Conventionally, there is a golf club head having a part where the metallic members are welded together, in which a face, a crown, a sole, and a hosel are welded by TIG welding, MIG welding, laser welding or electron beam welding (refer to JP-A-5-15620). [0005] However, when the metallic members were welded together by TIG welding or MIG welding, there was a problem that the weight control for the golf club head was difficult because a welding rod was employed and there was a sink in the weld zone. [0006] Moreover, when the metallic members were welded together by laser welding or electron beam welding, there was a problem that the cost required for machining the metallic members was increased, because it was necessary to machine in advance the metallic members precisely so as not to cause a gap between the metal materials at the time of welding, although the weight control for the golf club head was easy because it was unnecessary to employ the welding rod and there was no sink in the weld zone. Especially when the metallic members with different thickness were welded by laser welding or electron beam welding, the above-mentioned machining was difficult, and the cost required for machining the metallic members was very high. SUMMARY OF THE INVENTION [0007] The invention provides a golf club head having a part where the metallic members with different thickness are welded by plasma welding, laser welding or electron beam welding, in which it is unnecessary to machine in advance the metallic members precisely so as not to cause a gap between the metallic members at the time of welding, and its manufacturing method. [0008] According to an aspect of the present invention, a golf club head includes a first metallic member, a second metallic member having different thickness from the first metallic member, and a part where the first and second metallic members are welded by plasma welding, laser welding or electron beam welding. A gap between the first and second metallic members is filled up with another metal material besides the first and second metallic members. [0009] According to another aspect of the present invention, a manufacturing method of a golf club head, which includes a first metallic member, and a second metallic member having different thickness from the first metallic member, the manufacturing method includes welding the first and second metallic members by plasma welding, laser welding or electron beam welding, and filling up a gap between the first and second metallic members with another metal material besides the first and second metallic members. BRIEF DESCRIPTION OF THE DRAWINGS [0010] FIG. 1 is a perspective view showing a golf club head according to a first embodiment of the present invention; [0011] FIG. 2 is a cross-sectional view of the golf club head of FIG. 1, taken along the line X-X in FIG. 1; [0012] FIG. 3 is a perspective view of a face member for the golf club head of FIG. 1; [0013] FIG. 4 is an enlarged view of a weld zone for the golf club head of FIG. 1; [0014] FIG. 5 is an exploded perspective view showing a golf club head according to a second embodiment of the invention; [0015] FIG. 6 is a perspective view showing a golf club head according to a third embodiment of the invention; and [0016] FIG. 7 is an exploded perspective view showing a golf club head according to a fourth embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION [0017] As the plasma welding of the invention, the well-known plasma welding may be employed in which the members to be welded are dissolved and resolidified due to high temperature energy caused by plasma arc. As the laser welding, the well-known laser welding may be employed in which a gas laser such as CO laser or CO.sub.2 laser, or a solid laser such as YAG laser is used. Also, as the electron beam welding, the well-known electron beam welding may be employed in which the electron beam of appropriate output is used. [0018] In the invention, the method of performing the plasma welding, laser welding or electron beam welding while filling up a gap between the metallic members with another metal material is not limited, but maybe implemented as the method of performing the plasma welding, laser welding or electron beam welding, using a wire rod of another metal material, while filling up a gap between the metallic members with metal forming the wire rod. In this case, the wire rod of another metal material may suitably have a diameter from 0.5 to 3.5 mm, particularly from 1.0 to 2.5 mm. Also, when the plasma welding is employed, it is preferred that another metal material is added between the joined members to provide a weld overlay at the juncture, because the weldability and the welding strength are increased even if the dimensional precision between the welded members is bad. [0019] In the invention, a difference in thickness between the metallic members to be welded is appropriately from 0.1 to 1.5 mm, particularly from 0.2 to 0.6 mm. [0020] In the invention, the metallic members with different thickness may be selected from among titanium, titanium alloy, aluminum and stainless steel. Also, another metal material for filling up a gap between the metallic members with different thickness may be selected from among titanium, titanium alloy, aluminum and stainless steel. Another metal material for filling up a gap between the metallic members with different thickness is essentially the metal material separate from the metallic members with different thickness, and may or may not the same metal as one or both of the metallic members with different thickness. Continue reading... Full patent description for Golf club head and its manufacturing method Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Golf club head and its manufacturing method patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Golf club head and its manufacturing method or other areas of interest. ### Previous Patent Application: Connecting structure for striking plate and body of golf club head Next Patent Application: Golf ball Industry Class: Games using tangible projectile ### FreshPatents.com Support Thank you for viewing the Golf club head and its manufacturing method patent info. 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