Case hardening depth determination
The case hardening depth indicates how deep in the weld the hardness reaches a specific limit value. This is crucial for the strength and behavior under load.
Physical-Chemical Mechanism of Action
The case hardening depth is determined by measuring the distance from the surface of the component to the point where the hardness reaches a specified limit value. This process depends on the composition of the steel and the welding process.
Metallurgical Relevance & Risks in Welding
A case hardening depth that is too shallow can lead to a too soft core, which reduces the strength under load. A too deep hardening depth can lead to crack-sensitive structures and increased stress buildup, increasing the risk of cracks.
Workshop Practice & Instructions
To correctly determine the case hardening depth, a hardness test should be performed after welding. This can be done with a Brinell test or a Rockwell hardness tester. The specified limit value for hardness depends on the application area and specific safety requirements. For steels with high case hardening depth, careful control of welding parameters such as temperature, time, and stress is essential.