Gas Pre-Flow Time
Pre-flow time is the time before the arc ignites during which shielding gas is blown. This ensures the weld zone is protected and cleaned before welding.
Physicochemical Mechanism of Action
Pre-flow time refers to the period before arc ignition during which shielding gas like argon or helium is blown. This gas provides an inert environment and displaces any moisture and substances from the air that could cause corrosion or unwanted reactions.
Metallurgical Relevance & Welding Risks
A pre-flow time that is too short can mean the weld zone is not fully protected, leading to corrosion or other unwanted reactions. This can lead to poor weld quality and cracks. On the other hand, a pre-flow time that is too long can waste time and slow down production.
Workshop Practice & Action Instructions
Pre-flow time should be between 5 and 10 seconds depending on the welding method and material. For high-performance arc welding machines, the time can be slightly longer to ensure optimal cleaning. It is important to set the pre-flow time precisely and adjust if necessary to maximize weld quality and production speed.