Which function does the bucking bar serve during rivet installation?

The function of the bucking bar during rivet installation is to support the rivet while it is being driven. When a rivet is installed, a riveter tool exerts force to deform the rivet, which ultimately joins two or more pieces of material together. The bucking bar is placed on the back side of the rivet, and as the riveter applies force from the front, the bucking bar provides the necessary resistance that allows the rivet to be deformed uniformly and securely.

This role is crucial because, without the proper support from the bucking bar, the rivet may not be set correctly, resulting in a weaker joint. It ensures that the rivet is driven in a controlled manner, which is vital for maintaining the integrity of the assembly.

The other choices do not accurately describe the primary function of the bucking bar. Aligning tools refers to ensuring components are in the correct position, which is not the purpose of a bucking bar. Supporting the rivet might seem similar, but it is more about how it interacts with the deformed material once the rivet is being driven rather than directly influencing the driving process. Clamping the assembly implies holding parts in place rather than providing backing during the riveting