The term temperature refers to the degree or level of energy in a material and can be measured in degrees with a thermometer.
The term heat refers to the quantity of energy in a material and cannot be easily measured. The quantity of heat in a material can be determined by knowing both the temperature and mass (weight) of an object.
Likewise, the temperature of an arc from a small diameter electrode is the same as the arc from a large diameter electrode, but the larger arc has more heat.
What is the typical temperature of an arc?
The temperature of a welding arc is dependent on the voltage, arc length, and atmosphere. The arc temperature can range from around 5500°F (3000°C) to above 36,000°F (20,000°C), but most SMA welding arcs have effective temperatures around 11,000°F (6100°C).