Patent ID: 11964338
Assignee: OSAKA UNIVERSITY
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A low-temperature joining method, comprising:
forming a joint interface in which two metal materials face each other at a joint portion;
plunging a rotation tool, having a shoulder portion defining an outermost periphery of the rotation tool, with an applied load into one of the two metal materials at the joint portion, wherein a peripheral velocity of the outermost periphery of the shoulder portion of the rotation tool is set to 51 mm/s or less during the plunging, and wherein the applied load is not less than a value at which the rotation tool plastically deforms the one metal material without rotating the rotation tool during the plunging, whereby a recrystallization temperature inherent to the metal materials is reduced by introducing a strain to the joint portion, and
forming recrystallized grains at the joint interface, wherein the joining temperature is set to less than the recrystallization temperature inherent to the two metal materials.