| 摘要 |
A threaded connection for tubing joints having a threaded part and a matching part fixedly connected with the tube, which embraces the tube externally and rests with an inner surface having grooves at the outer surface of the tube, wherein the fixed connection between the matching part and the tube is produced by rolling material of the tube into the grooves, the matching part 2 having at least one groove 7, 8 which is conducted in a threaded shape manner, so as to prevent failure of the tubing joint by crack formation.
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