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Trace Element Poisoning Effect

Trace element poisoning effect: Unwanted metals in microgram amounts impair notch toughness and cause cracking.

Physical-Chemical Mechanism of Action

Unwanted trace elements such as selenium, arsenic, or cadmium can accumulate in the weld zone. These elements bond to the steel's crystal structure and alter its properties.

Metallurgical Relevance & Welding Risks

Trace element poisoning can lead to a loss of notch toughness, which causes cracks and fractures in the weld. The microstructure becomes coarser and strength drops.

Workshop Practice & Action Guidelines

Use high-purity filler metals and monitor oxygen levels in the molten weld pool. If in doubt, perform a chemical cleaning or switch the flux.

MetallurgieSchweißtechnik

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