Testing time for final tightening torque of high strength bolt connection pair

高强度螺栓连接副终拧扭矩的检测时间，要在终拧后1小时后，48小时内进行， 是因为螺栓终拧1h后，螺栓预拉力的损失已大部分完成，在随后的一两天内损失趋于平稳，当超过一个月后，损失就会停止，但在外界环境影响下，螺栓扭矩系数会发生变化，影响检测结果的准确性。

The final tightening torque of high-strength bolt connection pair shall be tested within 48 hours after 1 hour of final tightening, because the loss of bolt pretension has been largely completed 1h after the final tightening of the bolt, and the loss tends to be stable in the next oneortwo days. When it exceeds one month, the loss will stop, but under the influence of the external environment, the bolt torque coefficient will change, affecting the accuracy of the test results.

从工具本身精度来说，电动扭矩扳手分±7.5%-±2.5%精度不等，手动扳手精度一般在±3%；但是，手动工具在实际操作时收到人为因素较多，所以在使用状态下的产品精度，电动扭矩扳手要远远高于手动扭矩扳手。其次，电动扭矩扳手的力矩输出精度为动态力矩，手动扳手的力矩精度为静态力矩，两者在同一个螺栓上表现的力矩也是有差异的，就看你在使用中，更倾向哪一种形式了。

In terms of the accuracy of the tool itself, the accuracy of the electric torque wrench varies from ± 7.5% to ± 2.5%, and the accuracy of the manual wrench is generally ± 3%; However, there are many human factors in the actual operation of manual tools, so the product accuracy of electric torque wrench is much higher than that of manual torque wrench. Secondly, the torque output accuracy of the electric torque wrench is dynamic torque, and the torque accuracy of the manual wrench is static torque. There are also differences between the two on the same bolt, depending on which form you prefer in use.

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