When the arc length changes, the arc voltage also changes?

Relationship between Arc Length and Arc Voltage

Changes in arc length do affect arc voltage. Based on the search results provided, we can draw the following conclusions:

Direct Relationship between Arc Length and Arc Voltage

The longer the arc length, the higher the arc voltage; the shorter the arc length, the lower the arc voltage. This relationship is determined by the external characteristics of the arc welding power source.

Specific Impact

Applications in Welding: During welding, welders need to control arc length to maintain an appropriate arc voltage. For example, in stick arc welding, a normal arc length is typically equal to or less than the electrode diameter, corresponding to an arc voltage of 16 to 28V.

Impact on Welding Quality: Changes in arc voltage can affect welding quality. For example, an excessively long arc can reduce shielding effectiveness and easily cause problems such as arc blow.

Conclusion
In summary, changes in arc length do indeed lead to changes in arc voltage. In actual operation, welders need to adjust arc length according to specific circumstances to ensure welding quality and efficiency.