You are assigned to weld a support brace to a structural beam. The blueprint shows a symbol for a fillet weld on the arrow side with a leg size of 8 mm (5/16 in.) and a contour symbol that is a flat line connecting to the weld symbol. Below this, on the other side of the reference line, is a similar fillet weld symbol with a leg size of 6 mm (1/4 in.). What does the flat line contour symbol indicate?

Question: You are assigned to weld a support brace to a structural beam. The blueprint shows a symbol for a fillet weld on the arrow side with a leg size of 8 mm (5/16 in.) and a contour symbol that is a flat line connecting to the weld symbol. Below this, on the other side of the reference line, is a similar fillet weld symbol with a leg size of 6 mm (1/4 in.). What does the flat line contour symbol indicate?

Answer options: ✅ The weld needs to be ground flush with the base material on the arrow side.

• The weld should have a convex contour on the arrow side.
• The weld should have a concave contour on the arrow side.
• The weld needs to be painted on the arrow side.

Correct answer: The weld needs to be ground flush with the base material on the arrow side.

Explanation: A single straight line (flat line) contour symbol connected to a weld symbol indicates that the weld surface must be finished flat or flush with the adjacent base material. This often requires grinding or other machining. A convex or concave contour would be indicated by a curved line.