Contact Tip-to-Work Distance
The distance between the contact tube tip and the workpiece surface influences the electrical resistance and the stability of the arc.
Physicochemical Mechanism of Action
The contact tip distance determines how strongly the wire penetrates into the workpiece. Too large a distance leads to a weaker arc and increases electrical resistance, which impairs stability. Too small a distance can cause overheating and damage to the workpiece.
Metallurgical Relevance & Welding Risks
An inappropriate contact tip distance can lead to arc instability, hot cracking, or lack of penetration of the wire into the workpiece. This can result in poor weld quality and reduced component lifespan.
Workshop Practice & Action Instructions
The contact tip distance should be set so that the wire penetrates about 1 to 2 mm into the workpiece. This ensures stable arc formation and good wire penetration. For high-strength metals or thick components, a slightly increased distance may be necessary to minimize hot cracking.