CSA W59 Welding Inspector Level 1 Practice Test 2026 – All-in-One Guide to Master Metal Arc Welding Skills!

For plug or slot welds, the minimum amount of weld metal you must fill is a fixed fraction of the plate thickness to ensure adequate fusion through the thickness and proper load transfer. The standard sets this minimum at five-eighths of the material thickness. With a thickness of 1.0 inch, that equals 1.0 × 0.625 = 0.625 inches. This depth guarantees the weld penetrates deep enough to connect the pieces effectively without risking underfill. A shallower depth would be below the requirement, while a deeper fill would still satisfy the minimum but isn’t the minimum itself.