Certified Welding Inspector Practice Exam

How is an arc spot weld created?

1. By using a laser to melt the base materials

2. By applying pressure without heat

3. By utilizing an arc welding process

4. By using a torch and filler rod

The correct answer is: By utilizing an arc welding process

An arc spot weld is created specifically through the utilization of an arc welding process. In this method, an electric arc is established between an electrode and the base materials, generating the heat necessary to melt the surfaces of the materials being joined. This molten metal then fuses together as it cools, forming a strong bond. Arc welding techniques, which include processes such as Shielded Metal Arc Welding (SMAW) and Gas Metal Arc Welding (GMAW), are essential in producing effective spot welds due to the precise control of heat and the ability to concentrate it at specific points. This allows for creating localized welds with minimal distortion to the surrounding material, which is a significant advantage in various applications. In contrast, other options do not accurately describe how an arc spot weld is formed. For example, using a laser (first option) or a torch and filler rod (fourth option) describes different welding and cutting methods, while applying pressure without heat (second option) suggests a mechanical fastening technique rather than a welding process involving melting of base materials. Hence, the method of utilizing an arc welding process distinctly aligns with the definition and mechanism of creating an arc spot weld.