The maximum combined warpage and tilt of a flange permitted by CSA W59 is:

• A. 1/10 x flange width, no maximum
• B. 1/50 x flange width, no maximum
• C. 6 mm
• D. 1/100 x flange width, 6 mm maximum

Answer: (D)

The main idea is that CSA W59 controls how much a welded flange can distort after welding. The allowed distortion is set as a combination of a proportional limit based on the flange size and a fixed cap, to keep things workable across different flange widths.

The correct limit means the flange’s combined warpage and tilt must be no greater than the smaller of two values: one that scales with flange width (width divided by 100) and an absolute maximum of 6 mm. In other words, you use min(width/100, 6 mm). This ensures smaller flanges have a tighter, proportional limit, while larger flanges don’t exceed a practical cap.

For example, a 100 mm wide flange would be limited to 1 mm of distortion; a 500 mm flange would be limited to 5 mm; but a 700 mm flange would hit the 6 mm cap even though 7 mm would be the proportional limit, so the distortion cannot exceed 6 mm.

This combination—1/100 of flange width with a 6 mm maximum—matches the standard’s approach to balancing scalability with a reasonable upper bound.