US 12,246,389 B2
Steel joined body and method for manufacturing the same
Takuya Suzuki, Tokyo (JP); Masahiro Tsukahara, Tokyo (JP); Osamu Idohara, Tokyo (JP); and Setsuo Takaki, Tokyo (JP)
Assigned to Neturen Co., Ltd., Tokyo (JP)
Filed by Neturen Co., Ltd., Tokyo (JP)
Filed on Feb. 12, 2024, as Appl. No. 18/439,323.
Application 18/439,323 is a continuation of application No. 17/903,168, filed on Sep. 6, 2022, granted, now 12,011,775.
Claims priority of application No. 2021-146207 (JP), filed on Sep. 8, 2021; application No. 2021-146208 (JP), filed on Sep. 8, 2021; and application No. 2022-078948 (JP), filed on May 12, 2022.
Prior Publication US 2024/0181557 A1, Jun. 6, 2024
Int. Cl. B23K 20/00 (2006.01); B23K 20/02 (2006.01); B23K 20/22 (2006.01); B23K 103/04 (2006.01)
CPC B23K 20/026 (2013.01) [B23K 20/00 (2013.01); B23K 20/22 (2013.01); B23K 2103/04 (2018.08)] 2 Claims
OG exemplary drawing
 
1. A method for manufacturing a steel joined body having a plurality of steels joined together, the method comprising:
disposing a carbonaceous material on at least one joining surface of steels to be joined together;
overlapping joining surfaces of the steels to be joined together having the carbonaceous material interposed between the joining surfaces; and
heating the steels having the joining surfaces overlapped at a maximum temperature of 1150° C. or higher and 1500° C. or lower,
the carbonaceous material being disposed to generate a liquid phase on the joining surfaces at the maximum temperature,
the carbon concentration in a joint interface after high frequency induction heating was adjusted to 0.20 mass % or higher and 2.10 mass % or lower by controlling a heating and holding time at the maximum temperature.