Single pass fillet welds made in the horizontal position must not exceed what size?

Single pass fillet welds made in the horizontal position must not exceed what size?

• A. 8 mm
• B. 6 mm
• C. 10 mm
• D. 12 mm

Answer: (A)

In the horizontal position, a single-pass fillet weld is limited to eight millimeters for the leg size. This limit exists because the weld must achieve proper fusion and a sound bead in one pass, and the horizontal orientation challenges heat control and flow. The molten metal tends to sag and cool unevenly in horizontal welding, so larger welds are more prone to defects if you try to complete them in one pass. If the weld were larger than eight millimeters, it would be difficult to fill and fuse correctly in a single pass, increasing the risk of problems such as undercut, lack of fusion at the toes, or an irregular bead. So the maximum allowable size for a single-pass fillet weld in the horizontal position is eight millimeters. Smaller sizes are acceptable, but anything exceeding eight millimeters would require multiple passes to meet quality standards.

In the horizontal position, a single-pass fillet weld is limited to eight millimeters for the leg size. This limit exists because the weld must achieve proper fusion and a sound bead in one pass, and the horizontal orientation challenges heat control and flow. The molten metal tends to sag and cool unevenly in horizontal welding, so larger welds are more prone to defects if you try to complete them in one pass. If the weld were larger than eight millimeters, it would be difficult to fill and fuse correctly in a single pass, increasing the risk of problems such as undercut, lack of fusion at the toes, or an irregular bead. So the maximum allowable size for a single-pass fillet weld in the horizontal position is eight millimeters. Smaller sizes are acceptable, but anything exceeding eight millimeters would require multiple passes to meet quality standards.