Which of the following tools is NOT commonly used in autobody repair?

In autobody repair, each tool plays a specific role in the restoration and refinement of vehicle surfaces. Hammers are essential for straightening and shaping metal panels; they help remove dents and restore the original form of a vehicle's body. Welding machines are crucial for joining metal parts, especially when repairing or replacing damaged sections; they ensure structural integrity by fusing materials together. Sanders are used to smooth surfaces, prepare them for paint, and remove any imperfections, making them indispensable in achieving a flawless finish on the vehicle body.

While paint sprayers are indeed used in the painting process, they are more specialized for the application of paint rather than the physical repair and shaping aspects of autobody work. Therefore, they are not considered essential for the core functions of repairing and preparing the vehicle's body structure. This context clarifies that, among the options listed, paint sprayers do not fit the primary category of tools used for the repair work itself, which is why they are identified as the correct answer.