When welding vertical up, what is the recommended arc length?

When welding vertical up, maintaining a short arc length is highly recommended because it helps control the heat input and the molten pool of weld metal. A short arc length ensures that the electrode remains close to the workpiece, allowing for better penetration into the base metal and a more stable welding arc. This control is essential in vertical up welding since gravity plays a significant role; if the arc is too long, the molten metal may not deposit correctly, leading to problems such as excessive spatter, poor fusion, or even weld defects.

Additionally, using a short arc length aids in achieving a focused arc, which is crucial for vertical welding applications where the weld pool must be kept manageable to prevent it from sagging or dripping downwards. The proper arc length helps maintain a consistent bead profile and improves the overall quality of the weld.