There are several types of _________ welding processes, including spot-and-seam, flash, projection, and upset welding.

There are several types of _________ welding processes, including spot-and-seam, flash, projection, and upset welding.

• A. Arc
• B. Resistance
• C. Gas
• D. Laser

Answer: (B)

Spotting and seam welding, along with flash, projection, and upset welding, are all examples of resistance welding. The main idea is that heat for joining comes from electrical resistance, not from an external flame or laser. In resistance welding, the metal pieces are clamped together with electrodes, and a high electric current is passed through them. The contact points resist the current, heating up rapidly. Under pressure, the heated metal fuses and forms a weld without adding filler metal. This is different from arc welding (which uses an electric arc to melt the metal), gas welding (which uses a flame to melt the metal), or laser welding (which uses a focused laser beam). So, the listed processes are grouped together because they all rely on resistance heating to create the weld.

Spotting and seam welding, along with flash, projection, and upset welding, are all examples of resistance welding. The main idea is that heat for joining comes from electrical resistance, not from an external flame or laser. In resistance welding, the metal pieces are clamped together with electrodes, and a high electric current is passed through them. The contact points resist the current, heating up rapidly. Under pressure, the heated metal fuses and forms a weld without adding filler metal. This is different from arc welding (which uses an electric arc to melt the metal), gas welding (which uses a flame to melt the metal), or laser welding (which uses a focused laser beam). So, the listed processes are grouped together because they all rely on resistance heating to create the weld.