What is the acceptable range for the angle between the fillet weld face and the horizontal welded surface?

What is the acceptable range for the angle between the fillet weld face and the horizontal welded surface?

• A. 90 to 140 degrees
• B. 0 to 30 degrees
• C. 45 to 90 degrees
• D. 140 to 180 degrees

Answer: (A)

The angle of the fillet weld face relative to the horizontal welded surface determines how the bead sits in the joint and how the throat (the minimum thickness that resists shearing) is formed. An acceptable range of 90 to 140 degrees keeps the weld face upright enough to provide a solid, balanced cross-section while allowing a slight tilt as needed for proper fusion along both legs. At 90 degrees, the face is perpendicular to the horizontal base, giving a clean, robust bead with good throat depth. As the angle increases toward 140 degrees, the face tilts further but still maintains adequate throat and fusion, which helps prevent underfill, excessive convexity, or slag entrapment. Angles below 90 degrees would make the weld face too flat against the surface, risking reduced throat thickness and poor fusion, while angles beyond about 140 degrees push the face too far and can create undesirable weld geometry.

The angle of the fillet weld face relative to the horizontal welded surface determines how the bead sits in the joint and how the throat (the minimum thickness that resists shearing) is formed. An acceptable range of 90 to 140 degrees keeps the weld face upright enough to provide a solid, balanced cross-section while allowing a slight tilt as needed for proper fusion along both legs. At 90 degrees, the face is perpendicular to the horizontal base, giving a clean, robust bead with good throat depth. As the angle increases toward 140 degrees, the face tilts further but still maintains adequate throat and fusion, which helps prevent underfill, excessive convexity, or slag entrapment. Angles below 90 degrees would make the weld face too flat against the surface, risking reduced throat thickness and poor fusion, while angles beyond about 140 degrees push the face too far and can create undesirable weld geometry.