Patent ID: 11897058
Assignee: HYUNDAI ROBOTICS CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 3:
4. The weld groove forming method of claim 3, wherein the step (S120-1) is a step of cutting the outer wall of the pipe so that a thickness decreases at a constant rate from the first point to the second point,
wherein the step (S120-2) is a step of cutting the outer wall of the pipe so that a thickness decreases at a constant rate from the second point to the third point,
wherein the step (S120-3) is a step of cutting the outer wall of the pipe so that a thickness decrease according to a predetermined radius of curvature from the third point to the fourth point,
wherein the step (S120-7) is a step of cutting the outer wall of the pipe so that a thickness increases at a constant rate from the fifth point to the sixth point.