Residual Torque / Time

This strategy evaluates the residual torque on a joint, looking for the residual point of the Torque/Time trace.

Parameter	Description
Inspection Name	Name of the inspection.
Cycle start	Torque value from which the test operation starts. The Cycle start must be ≥ smartHEAD Min load value. If Cycle start = 0, its value is automatically set to the smartHEAD Min load value.
Minimum torque	Lower torque limit value.
Maximum torque	Upper torque limit value.
Change screw	If the torque applied reaches this limit, the message Change screw is shown on the wrench display. The Change screw must be ≥ Maximum torque.
Target torque	Torque target value.
Torque tolerance	Torque tolerance that defines the maximum torque and the minimum torque according to the Target torque previously specified. Value is expressed in percentage (%).
Control mode	Method to define the torque limits from the following options: Min/Max: the torque lower and upper limits are the values entered for the parameters Minimum torque and Maximum torque. Target/Tolerance: the torque lower and upper limits are calculated according to the values of the parameters Target torque and Torque tolerance.
Torque correction coefficient	When extensions are used, the wrench measurement must be compensated to show a more accurate torque value. To calculate the correction coefficient, please refer to How to calculate the Torque Correction Coefficient. When extensions are not used, Torque correction coefficient = 1.
Angle correction coefficient	When extensions cause additional wrench bending, the wrench angle measurement must be compensated to show a more accurate angle value. To calculate the correction value, please refer to How to Calculate the Angle Correction. When extensions are not used, Angle correction coefficient = 0.
Number of sample	Number of tests to run inside the inspection. Maximum value: 1000. If Number of sample = 0, the number of tests is infinite. If Number of sample > 1, batch result OK only if all tests are OK.

With this strategy, the torque trace is analyzed as a function of time, and the wrench automatically identifies both the breakaway and residual points. The detection is automated, the operator must perform the operation with a single steady movement. This methos is less objective and is typically used when torque/angle evaluation is not possible.

T₀	Cycle start	T₁	Minimum torque
T₂	Maximum torque	B	Breakaway point
R	Residual point

Result:

If the wrench detects the residual point, the test result is OK. The torque value is the detected residual point.
If the wrench does not detect the residual point, the torque value is the maximum measured torque. If this maximum value is within the acceptable limit, the torque value is OK, but the overall test result is Not OK.
If the torque exceeds the Change Screw threshold, the wrench cannot detect the residual point. In this case, the torque value is the maximum measured torque.