Arc welding is one of the most popular types of welding methods. An electric arc is created between metal and an electrode, forming a puddle where additional welding filler material can be added. Many welders choose arc welding since it is relatively cheap and easy to do, even if learning how to weld takes a good deal of practice. Beginners will need to learn how to “strike” an arc, which can be struck by scratching the electrode along metal rapidly like striking a match or by tapping it against metal.

Arc welders may use either consumable or non-consumable electrodes as well as either alternating (AC) or direct (DC) current for their power. This power supply is used to form an electric arc between electrodes and base materials.

Manual welding calls for a constant current of electricity. The constant power supply is important due to the fact that it can be hard to hold the electrode rod perfectly steady when welding manually. The arc length and voltage would fluctuate as the electrode rod moves, but the constant power supply helps to keep them steady enough to make a good weld.