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Active carbon dioxide shielding gas
Active shielding gas carbon dioxide (CO2) produces deep penetration when MAG welding unalloyed steels and protects the weld from corrosion.
Physicochemical Mechanism of Action
Carbon dioxide reacts with the iron oxide in the melting zone, which makes the penetration deep. It forms a protective layer on the steel surface that prevents corrosion.
Metallurgical Relevance & Risks in Welding
Too low CO2 content leads to weak penetration and increases the risk of corrosion. Too much CO2 can lead to over-penetration, which affects hardness and toughness.
Workshop Practice & Instructions
Use a CO2 content between 10% and 30% for optimal results. Constantly monitor gas flow and adjust as needed. Excessive cooling can lead to excessive hardness, which can cause cracking.
MetallurgieSchweißtechnik