Current Value in Arc Welding

Introduction
Arc welding is a process in which two metal pieces are joined together using an electric arc. In this process, the current value plays a significant role in determining the quality of the weld. The current value is decided by various factors such as thickness of plate, length of welded portion, voltage across the arc, and diameter of the electrode.

Diameter of Electrode
The diameter of the electrode is the most important factor that determines the current value in arc welding. The current value is directly proportional to the diameter of the electrode. A larger diameter electrode requires more current to maintain the electric arc.

Thickness of Plate
The thickness of the plate is another important factor that influences the current value. A thicker plate requires more current to melt the metal and create a good weld. However, too much current can cause the metal to melt too quickly, which can result in a poor quality weld.

Length of Welded Portion
The length of the welded portion also influences the current value. A longer weld requires more current to ensure that the weld is strong and secure.

Voltage Across the Arc
The voltage across the arc also plays a role in determining the current value. A higher voltage requires more current to maintain the electric arc. However, too much voltage can cause the metal to melt too quickly, which can result in a poor quality weld.

Conclusion
In conclusion, the current value in arc welding is decided by various factors such as thickness of plate, length of welded portion, voltage across the arc, and diameter of the electrode. However, the diameter of the electrode is the most important factor that determines the current value. It is essential to maintain the right current value to ensure a high-quality weld.