In order to verify that the hardness tester’s loading device is stationary and that the load being applied to the material is static, dwell time is required. Dynamic loads—which result from movement—can unintentionally be applied during testing if the indentor is moving too quickly. These loads will increase the apparent load on the material, which will increase the size of the indent and produce a reading of hardness that suggests the material is softer than it actually is.

The dwell time for the test force is typically between 10 and 15 seconds (nominal time duration 14 s). If the dwell time is any longer, the hardness value must also include the length in seconds, for example: 610 HV 10/30. (dwell time of 30 s).

In conclusion, the dwell time exists to guarantee the hardness test’s accuracy.

NextGen’s BrinGen – 3000 Series – Digital Brinell and Automatic Brinell Hardness Tester has the following dwell time range: 1-60s.

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