The results show that the fracture may be due to improper heat treatment which leads to over hardness of the thread part and the joint of thread part and tooth part.
结果表明，断裂是由于热处理工艺不当、管子钳活动钳口齿部、螺纹部以及螺纹和齿部的过渡连接部分硬度过高引起；
This paper discusses the mechanical, hardware, software configurations and principles of CAT system for joint internal thread in details.
详细介绍了油管接箍内螺纹计算机辅助测量系统的机械、软硬件结构与原理。
That the thread endures high alternate stress is the first cause of failure of thread joint.
螺纹部位承受高的交变应力，是导致螺纹联接螺纹失效的主要原因。
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