Page 34 - CITS - Welder - Trade Theory

WELDER - CITS

3 Voltage and Current
• Voltage (V) is the measure of electrical potential difference between two points in a circuit. It represents the
force that pushes electric charges through a conductor.
• Current (I) is the flow of electric charge. It is measured in amperes (A) and determines the rate at which
electric charge passes through a conductor.

• In arc welding, adjusting voltage and current settings is essential to control the heat input and penetration
into the work piece.
4 Resistance
• Resistance (R) is the opposition to the flow of electric current in a circuit. It is measured in ohms (Ω).

• The resistance in the welding circuit plays a significant role in generating heat. The high resistance at the
point where the electrode contacts the work piece leads to intense heat generation, forming the arc.
5 Electric Arc

• An electric arc is a discharge of electricity between two electrodes through ionized gas or plasma.
• In arc welding, the arc forms between the welding electrode and the work piece, creating temperatures high
enough to melt the base metal and any filler material, resulting in a strong weld joint.

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CITS : C G & M - Welder - Lesson 6&7