Which is a disadvantage of using a rounded bend in metal fabrication?

Using a rounded bend in metal fabrication can indeed lead to a disadvantage because it can weaken the overall structure of the material. When a bend is made in metal, especially if it is too sharp or not properly executed, it can create stress concentrations at the bend area. This can make it more susceptible to fatigue, cracking, or failure under load over time, especially in high-stress environments.

Rounded bends, while more aesthetically pleasing and sometimes more effective at distributing stress compared to sharp angles, can not always optimize the structural integrity if not designed correctly. When considering the effects of bending on metal, particularly in load-bearing applications, it is crucial to balance the desired curvature with the material's ability to withstand stresses.

In contrast, options pertaining to cost, assembly difficulties, or radius size don’t inherently capture the essential concerns surrounding the structural integrity and performance affected by the bending process.