| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that quenching hardness cannot be made very high and a quenching crack is generated in a rod crown body in a gas welding method and a method of simultaneously carrying out brazing and quenching by a high frequency brazing machine. SOLUTION: A cemented carbide tip is brazed to the rod crown body, cooled once and heated again to perform quenching. A wax material thereby has a sufficient joining force, and the quenching hardness of the rod crown body is high (HRC 60 or higher) to manufacture the stable rod crown free from the quenching crack. COPYRIGHT: (C)2005,JPO&NCIPI
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