高強度螺栓連接副終擰扭矩的檢測時間
Testing time for final tightening torque of high strength bolt connection pair
高強度螺栓連接副終擰扭矩的檢測時間，要在終擰后1小時后，48小時內進行， 是因為螺栓終擰1h后，螺栓預拉力的損失已大部分完成，在隨后的一兩天內損失趨于平穩(wěn)，當超過一個月后，損失就會停止，但在外界環(huán)境影響下，螺栓扭矩系數會發(fā)生變化，影響檢測結果的準確性。
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.
從工具本身精度來說，電動扭矩扳手分±7.5%-±2.5%精度不等，手動扳手精度一般在±3%；但是，手動工具在實際操作時收到人為因素較多，所以在使用狀態(tài)下的產品精度，電動扭矩扳手要遠遠高于手動扭矩扳手。其次，電動扭矩扳手的力矩輸出精度為動態(tài)力矩，手動扳手的力矩精度為靜態(tài)力矩，兩者在同一個螺栓上表現(xiàn)的力矩也是有差異的，就看你在使用中，更傾向哪一種形式了。
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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