Engineering hardness value
The technical hardness value measures the strength of a material through a specific test force and deformation. It indicates how much force the material can withstand before it plastically deforms.
Physical-chemical mechanism of action
The technical hardness value (THV) is determined using a specific test force and a defined deformation geometry. It measures the stress at which the material deforms plastically. This value gives direct insight into the material's mechanical strength.
Metallurgical relevance & welding risks
A technical hardness value that is too high can lead to increased stress buildup, causing cracks and wear. This is especially dangerous in highly stressed components. A value that is too low means lower strength and higher ductility, which can lead to distortion.
Shop practice & instructions
To measure the technical hardness value, deform the material in a special test setup under a defined load. The stress at plastic deformation is then measured and reported as the technical hardness value. In welding, it is important that the weld has a sufficiently high THV to withstand mechanical loads. This can be ensured by correctly selecting the material and the welding process.