Which welding process uses an electric arc?

Which welding process uses an electric arc?

• A. Gas welding
• B. Oxy-fuel welding
• C. Arc welding
• D. Soldering

Answer: (C)

Electric arc welding creates heat by forming an electric arc between an electrode and the workpiece. That arc concentrates a lot of energy at a small point, melting the metal (and any filler material) so the pieces fuse as the molten metal cools. This is the method that relies on electrical current to generate the heat and weld the parts together. In contrast, gas welding and oxy-fuel welding use a flame from burning gas, not an electric arc, and soldering uses a low-temperature filler metal without melting the base metals. So the process that uses an electric arc is arc welding.

Electric arc welding creates heat by forming an electric arc between an electrode and the workpiece. That arc concentrates a lot of energy at a small point, melting the metal (and any filler material) so the pieces fuse as the molten metal cools. This is the method that relies on electrical current to generate the heat and weld the parts together. In contrast, gas welding and oxy-fuel welding use a flame from burning gas, not an electric arc, and soldering uses a low-temperature filler metal without melting the base metals. So the process that uses an electric arc is arc welding.