What is the allowable angle range for fillet welds in CJP joints?

• A. 45 degrees to 90 degrees
• B. 0 degrees to 180 degrees
• C. 60 degrees to 135 degrees
• D. 30 degrees to 150 degrees

Answer: (C)

The angle in a fillet weld is the apex angle formed by the two weld legs along the joint faces. This angle directly affects the throat thickness, which is the critical zone that carries the load. Keeping the angle within a practical range preserves an adequate throat while avoiding overly bulky or overly slender welds. If the angle is too small, the throat becomes too shallow and the weld strength drops; if the angle is too large, the weld becomes tall and narrow, which can cause accessibility, welding practicality, and performance issues. For these reasons, the allowable range is 60 to 135 degrees.