Which of the following welding techniques is generally used for sheet metals?

• A. Arc welding
• B. Submerged arc welding
• C. Resistance welding
• D. Gas tungsten arc welding

Answer: (C)

Resistance welding is commonly utilized for joining sheet metals because it is efficient and well-suited for thin materials. This technique employs heat generated from electric resistance at the interface of the metals being joined, along with pressure, to create the weld. The process is quick, allowing for a rapid succession of welds, making it ideal for mass production environments where sheet metal assemblies are prevalent, such as in the automotive and appliance industries.

In contrast, while other techniques such as arc welding can also be used for sheet metals, they may not be as efficient or effective for very thin materials due to the heat distribution and potential for warping. Submerged arc welding, although excellent for thicker sections and offering deep penetration, is not typically used for sheet metal work due to its own limitations. Gas tungsten arc welding is more commonly used in applications requiring high-quality welds and precision but may not be practical for high-speed production of thin sheets. Thus, resistance welding stands out as the preferred choice for joining sheet metals effectively.