The Difference Between AC Welding and DC Welding

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AC and DC Welding are forms of arc welding that use different currents to produce an electric arc. These types of welding involve the creation of an electric arc between an electrode and the metal being welded. The electric arc provides heat to fuse the metals together.

A power supply is used to generate the arc, which can either use an alternating current (AC) or a direct current (DC). The choice of power source (AC or DC) decides the polarity of the electrical current that runs through the electrode. The power source used also impacts the weld produced.

Selecting the correct electrode polarity impacts the strength and quality of your weld. Commonly known as ‘straight’ or ‘reverse,’ the two types of current flow are also called ‘electrode negative’ and ‘electrode positive.’  The DC polarity is constant while the AC polarity flows in one direction for half of the time and half of the time in the other, reverse, direction.

AC Welding

AC Welding

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