Trace Element Limit
Trace element limits define maximum tolerance thresholds for unwanted companion elements like tin, antimony, or arsenic in metals. These limits prevent temper embrittlement and improve weld strength.
Physico-chemical mechanism of action
Trace elements like tin, antimony, or arsenic can act as triggers for embrittlement in metals. These elements can disrupt the crystal structure and change the microstructure, which can lead to damage and cracks.
Metallurgical relevance and welding risks
If trace elements exceed their limits, this can lead to temper embrittlement. This increases the risk of hot cracking and reduces the strength of the weld. It's crucial to keep these elements under control to ensure a safe and reliable weld.
Workshop practice and actions
When welding, you have to respect the trace element limits. You can do this by choosing the right materials, controlling the shielding gas, and using deoxidizers. For certain metals like steel, there are, for example, maximum zinc or antimony levels. You have to stick to these limits to get a safe weld.