Patent ID: 7544259

Claim:
A method for manufacturing a copper alloy welding electrode tip of a welding machine, comprising the steps of: enabling any of chromium (Cr), zirconium (Zr), beryllium (Be), titanium (Ti) and boron (B) to dissolve in a solid solution in a base-material metal (Cu) as a second element that does not dissolve or scarcely dissolves in copper in a solid solution state at room temperature, wherein respective addition ratios of the second element being Cr:0.1 to 1.4 wt %, Zr:0.15 to 0.5 wt %, Be:0.1 to 3.0 wt %, Ti:0.1 to 6.0 wt %, B:0.01 to 0.5 wt %, applying a strain equivalent to an elongation of not less than 200% to this material to achieve crystal grain refinement, wherein strain is applied by extruding the material, and extrusion conditions are such that lateral extrusion is performed at a material temperature of 400 to 1,000° C., a die temperature of 400 to 500° C., and an extrusion speed of 0.5 to 2.0 mm/sec, and subjecting this material to aging treatment simultaneously with or subsequent to application of this strain, thereby promoting precipitation of the second element among crystal grains.