When using a bevel or a j-groove weld symbol, the plate to be prepared is indicated by a __________ arrow?

The correct answer is that the plate to be prepared is indicated by a broken arrow. In welding symbols, a broken arrow signifies that the preparation for the weld, such as a bevel or j-groove, is needed on the workpiece. This visual cue helps welders understand which surface is to be processed to create a beneficial joint for the weld.

The use of the broken arrow specifically highlights the area that requires modification, ensuring clarity in the welding process. This clear indication supports proper alignment and execution of the weld, which is critical for the integrity of the structure being fabricated.

In contrast, other types of arrows may not convey the same informative purpose regarding preparation. A solid arrow typically indicates a straightforward weld without special preparation, a dotted arrow might suggest a different kind of connection or joint that does not require surface preparation, and a curved arrow does not have a defined meaning related to preparation in welding symbols.