# US 10,946,255 B2 · Methods of manufacturing golf club heads > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,946,255 B2 - Document ID: US10946255B2 - Status: Granted - Kind: B2 - Application number: 16/934,323 - Filed: 2020-07-21 - Published: 2020-11-05 - Granted: 2021-03-16 - Earliest claimed: 2018-04-11 - Assignees: Callaway Golf Company - Applicants: Callaway Golf Company - Inventors: Joseph R. Aplin; Patrick C. Davis; Matthew R. Daraskavich; Joshua D. Westrum; Scott Manwaring; Kenneth E. Meacham; Justin Kuhar - Web page: https://patentgrep.com/patent/US10946255B2 ## CPC - B22F 3/225: {by injection molding} - A63B 53/047: {iron-type} - B22F 1/108: {Mixtures obtained by warm mixing} - B22F 5/10: of articles with cavities or holes, not otherwise provided for in the preceding subgroups - B22F 7/062: {involving the connection or repairing of preformed parts} - B22F 7/064: {using an intermediate powder layer} - B23K 11/0026: {Welding of thin articles} - A63B 53/0416: {Heads having an impact surface provided by a face insert} - A63B 53/042: {the face insert consisting of a material different from that of the head} - A63B 53/0425: {the face insert comprising two or more different materials} - A63B 53/0429: {the face insert comprising two or more layers of material} - A63B 53/0433: {with special sole configurations} - A63B 53/0475: {with one or more enclosed cavities} - A63B 53/08: with special arrangements for obtaining a variable impact - A63B 2053/0491: {with added weights, e.g. changeable, replaceable} - A63B 2209/00: Characteristics of used materials - B22F 2998/10: Processes characterised by the sequence of their steps - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM ## Abstract A golf club head comprising at least one part manufactured via a metal injection molding process, and attached to another part of the golf club head via electrical resistance welding or electrical resistance brazing, is disclosed herein. The present invention is also directed to a method of making said golf club head, the method comprising the steps of providing a first golf club head part made from a first metal material, metal injection molding a second golf club head part from a second, different metal material, and electrical resistance welding or electrical resistance brazing the second golf club head part to the first golf club head part to form a combined part. ## Claims ### Claim 1 A method comprising the steps of: casting from a first metal material a golf club face component comprising a striking face, a rear surface opposite the striking face, and a recess disposed in the rear surface; metal injection molding a weight plate from a second metal material, the weight plate having approximately the same size and shape as the recess; providing a braze alloy material; placing the braze alloy material in the recess; placing the weight plate within the recess on top of the braze alloy material to form a combined part; and electrical resistance brazing the weight plate to the face component, and wherein the second metal material has a higher density than the first metal material. ### Claim 2 (depends on 1) The method of claim 1, wherein the weight plate has a thickness of less than 0.075 inch, a mass of 10-25 grams, and a density of 18-18.5 g/cc. ### Claim 3 (depends on 1) The method of claim 1, wherein the braze alloy material is a brazing paste or a braze preform foil. ### Claim 4 (depends on 1) The method of claim 1, wherein the braze alloy material comprises silver and copper. ### Claim 5 (depends on 4) The method of claim 4, wherein a majority of the braze alloy material is composed of silver and copper. ### Claim 6 (depends on 1) The method of claim 1, wherein the first metal material is selected from the group consisting of steel and titanium alloy. ### Claim 7 (depends on 1) The method of claim 1, wherein the second metal material comprises tungsten. ### Claim 8 (depends on 1) The method of claim 1, further comprising the step of applying at least one finish to the combined part. ### Claim 9 (depends on 1) The method of claim 1, wherein each of the first and second metal materials is selected from the group consisting of steel and titanium alloy. ### Claim 10 (depends on 1) The method of claim 1, further comprising the step of permanently affixing the combined part to a golf club head body. ### Claim 11 (depends on 10) The method of claim 10, wherein the golf club head body is an iron-type body. ### Claim 12 A method comprising the steps of: providing an electrical resistance system comprising a pair of electrodes; placing between the pair of electrodes a golf club head comprising a first piece composed of a first metal material, a second piece composed of a second, braze alloy material, and a third piece composed of a third material, wherein the second piece is disposed between the first and third pieces; applying power to a plurality of regions of the golf club head so that the braze alloy material melts between and connects the first and third pieces; and removing the golf club head from the electrical resistance system. ### Claim 13 (depends on 12) The method of claim 12, further comprising the step of metal injection molding at least one of the first piece and the third piece, wherein the step of metal injection molding at least one of the first piece and the third piece occurs before the step of placing the golf club head between the pair of electrodes. ### Claim 14 (depends on 13) The method of claim 13, wherein the step of metal injection molding at least one of the first piece and the third piece comprises co-injection molding two different metal alloys. ### Claim 15 (depends on 12) The method of claim 12, wherein the golf club head is an iron-type head. ### Claim 16 (depends on 12) The method of claim 12, wherein the braze alloy material is a brazing paste or a braze preform foil. ### Claim 17 (depends on 12) The method of claim 12, wherein the braze alloy material comprises silver and copper. ### Claim 18 (depends on 17) The method of claim 17, wherein a majority of the braze alloy material is composed of silver and copper. ### Claim 19 (depends on 12) The method of claim 12, wherein the first metal material is selected from the group consisting of steel and titanium alloy. ### Claim 20 (depends on 12) The method of claim 12, wherein the third metal material comprises tungsten.