But one thing in common is that international and industry standards all prescribe procedures for testing the tensile strength of wire terminals in a repeatable manner.
There are many standards to adhere to and each manufacturer or user might have different requirements to fulfil. Calibration is best carried out in response to Statistical Process Control (SPC) analysis which can be gathered from data obtained by pull testers. Overcrimping a crimp termination will reduce the circular area of the conductor and thereby increase electrical resistance.Ĭrimp joint testing (commonly known as "pull testing") ensures the integrity of the final product but, more importantly, it ensures the effectiveness of the crimping tool itself since it can be calibrated according to test results. If this does not occur, electrical resistance can increase.
This is necessary to provide a good metal-to-metal contact. This is crucial as enough force must be applied to break down the layer of non-conductive oxides that may build up on the stripped conductor and the plating on the inside of the terminal. If results from pull force tests are within an allowed range, it assures that the proper crimp force has been applied during the crimping process. The quality of a crimp joint depends on the mechanical strength of the joint as well as its electrical conductivity.
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