Arc Stability
Arc stability is the ability of an arc to burn evenly without unwanted interruptions or spatter. It is ensured by the power source, feed, and gas shielding.
Physical-Chemical Working Mechanism
An arc consists of an electrical circuit that carries a strong electric current between two electrodes. This current produces a hot flame or burning area between the electrodes. Arc stability depends on controlling these electrical properties.
Metallurgical Relevance & Welding Risks
An unstable flame can lead to irregular heat transfer, spatter, and current fluctuations. This can cause uneven welds, porosity, and even cracks in the material. A stable arc ensures even heat transfer and improves weld quality.
Shop Practice & Operating Instructions
To ensure arc stability, the following parameters must be maintained:
• Power source: A stable power supply with constant voltage is essential.
• Feed: The workpiece feed must be accurate and uniform to ensure constant heat transfer.
• Gas shielding: Adequate gas coverage (e.g., argon) protects the arc from oxidation and promotes flame stability.