What slope ratio is allowed for the depression after discontinuity removal if no welding is required?

• A. 1 in 6
• B. 1 in 10
• C. 1 in 12
• D. 1 in 20

Answer: (B)

When discontinuities are removed by gouging but no welding is performed, the depression left in the metal must fade smoothly into the surrounding surface to avoid creating a sharp notch that could concentrate stress under service loads. The standard sets a maximum slope for this depressed area: it may not be steeper than 1 in 10. This means for every 10 units of horizontal distance, the vertical depth of the depression cannot exceed 1 unit. A steeper slope, like 1 in 6, would introduce a more pronounced notch and higher risk of crack initiation, so it’s not allowed. Gentler slopes (such as 1 in 12 or 1 in 20) are more forgiving, but the established limit to reference is 1 in 10, which is why that ratio is the correct choice.