Shielding Gas Flow Rate
The shielding gas flow rate is the volume of shielding gas injected into the weld pool to remove oxygen and prevent porosity.
Physical-Chemical Mechanism of Action
The shielding gas flow rate is the volume of shielding gas injected into the molten pool. The gas reacts with oxygen and forms a protective layer on the metal surface, preventing porosity.
Metallurgical Relevance & Risks in Welding
A shielding gas flow rate that is too low can allow oxygen into the molten pool, causing porosity or corrosion. A flow rate that is too high can cause overpressure and gas bubbles in the metal.
Workshop Practice & Instructions
The shielding gas flow rate should be set precisely, depending on the materials used and process parameters. For steel with 0.2 % carbon, a flow rate of about 15-20 l/min per kg of metal is recommended. Continuously monitor the gas flow and adjust it as needed.