According to CSA, which formula is used to measure a convex fillet weld?

The correct choice for measuring a convex fillet weld according to CSA standards is based on the formula that accurately accounts for the weld's face width and allows for a specific increase to obtain the appropriate measurement. In this case, the formula 0.07 x face width + 1.6 mm effectively takes into consideration the unique characteristics of convex fillet welds, which generally have a specific profile that should be accounted for in the measurement.

Using the face width as a parameter provides a consistent method to gauge the weld's size, while the additional 1.6 mm is included to adjust for the rounded nature of the convex bead, ensuring that the measurement reflects the actual geometry of the weld accurately. This method aligns with the CSA standards, emphasizing the importance of precision in welding practices.

In contrast, the other formulas do not correctly utilize the dimensions necessary for measuring convex fillet welds as specified in CSA guidelines. For instance, options that use leg length or manipulate the face width differently fail to reflect the proper criteria for obtaining an accurate measurement of a convex fillet weld. This distinction is crucial for compliance with welding standards and ensuring the integrity of welds in various applications.