Which type of weld is likely used to join two metal round bars in a side-by-side orientation?

The most appropriate choice for joining two metal round bars in a side-by-side orientation is the type of weld that effectively accommodates the shapes and spacing of the materials being joined. Flare-groove welds are designed for situations where two parts, typically with a rounded or angled edge, need to be connected. They are ideal for situations where the edges of the bars can be accessed for welding in a way that allows for the creation of a groove between them, which improves the penetration of the weld.

In contrast, fillet welds are generally used to join two parts at an angle, while butt welds are more suitable for joining flat surfaces end to end. Tee joints are specifically designed to attach one piece perpendicular to another, which doesn’t align with the orientation of round bars in a side-by-side position. Thus, flare-groove welds provide the necessary structural integrity and suitability for connecting round bars in a way that the other options do not.