Hardness indenter
A hardness test indenter is a geometrically defined tool made of hard material such as diamond or carbide, which is pressed into the material sample with a test force. Its shape and hardness are specified in the relevant standards.
Physical-Chemical Mechanism of Action
A hardness indenter is made of a material with high mechanical strength, like diamond or hard metal. It is pressed into the workpiece under a known test force, and the depth of penetration is measured. This gives an indicator of the hardness of the sample.
Metallurgical Relevance & Risks in Welding
The hardness of a material is a key factor for its mechanical properties like toughness and load-bearing capacity. Too high or too low hardness can lead to cracks, wear, or other defects. In a weld seam, hardness must be carefully checked to ensure it meets specific requirements.
Workshop Practice & Instructions
Use a hardness indenter with the correct shape and hardness according to the respective standards. Press it into the workpiece under a defined test force, e.g., 150 N for a Rockwell hardness test. Measure the depth of penetration precisely and compare the result with the hardness class of the sample. Ensure the sample is dry and free of surface irregularities before testing.