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Verify and Validate the Torque Output of a Pulse Tool


Built for high production environments, FlexPower pulse tools provide durability, power and speed for most industrial assembly applications. To maintain consistent accuracy, the torque output for pulse tools must be verified periodically. You should also validate the actual torque being applied to the fastener by auditing the joint application. The goal for auditing is to verify adequate torque was delivered to the fastener and detect any loose fasteners or joint relaxation.

You need to validate the proper pulse tool is being used for the assembly application. Although a pulse tool has a specified torque range, the type of joint the tool is being utilized on is a key component. A pulse tool is a discontinuous tool and added adapters or extensions create a dampening effect, thus lowering torque values.

Pulse tools are joint sensitive. The static torque shown on a torque tester or torque sensor can be different than actual torque applied on the joint application. The joint characteristic of the application can impact the tool's performance.

To validate the actual torque output from a pulse tool on the fastener, you need to measure the residual torque. What is residual torque? It is the amount of tension that remains in a joint after fastening a threaded fastener. The best way to determine residual torque is by performing a "first movement" test.

Using a pulse tool, run down the fastener(s) on the actual joint application. You will then need to test the residual torque to ensure it has been fastened to the required torque for that application. Use either a digital torque wrench or a torque tester with a torque wrench sensor. The torque reading displayed by the wrench or torque analyzer shows the actual torque applied by the pulse tool for that specific joint application.

If the pulse tool doesn't achieve the desired torque for that joint application, then you will need to adjust the torque setting of the pulse tool or perhaps select another pulse tool with higher or lower torque range capacity.

The goal for verifying and validating the torque output of pulse tool is to improve process results. To do this it is necessary to gather information for evaluation and analysis. A torque audit that fails to provide relevant information to improve the fastening process is worthless. Sometimes achieving proper torque requires practical experimentation. In order to experiment data is required.

Using a quality pulse tool makes a safer world through accuracy and precision. Controlling torque is essential for companies to ensure their product's quality, safety and reliability isn't compromised. The failure of a three-dollar bolt that isn't properly tightened can lead to catastrophic or latent failures. Fasteners that are insufficiently fastened can vibrate loose and excessive torque can strip threaded fasteners.

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