What does a black flag at the arrow end of the reference line indicate?

Question

A. Weld all around
B. Field weld
C. Shop weld
D. Weld on other side

Answer 1

The black flag at the arrow end of the reference line indicates:

D. Weld on other side

This symbol typically suggests that a weld is required on the opposite side of the reference line, as specified in welding drawings.