Carbide sink
Carbide depleted zones are areas in the weld where the carbon concentration is low and no strong carbide formation occurs. This can be caused by mismatched alloys or thermal changes during welding.
Physical-chemical mechanism of action
Carbide depleted zones form when the carbon concentration in the weld zone is too low. This can be due to insufficient diffusion of carbon from the surrounding medium or to thermal changes during welding. In these zones, no strong carbide forms, reducing the hardness and strength of the weld.
Metallurgical relevance & risks when welding
Carbide depleted zones can lead to reduced hardness and strength of the weld. This increases the risk of cracking and wear, especially under high mechanical loads. Additionally, uneven carbon distribution can cause stress buildup and other metallurgical problems.
Workshop practice & instructions
To avoid carbide depleted zones, it is important to select the right filler material for the base material. Welding parameters such as temperature and time must be carefully set to ensure even carbon distribution. In complex welding processes, it is advisable to monitor thermal cycles and take corrective action if needed.