A PQR test coupon with a shell thickness of 'T' can generally be used to qualify a wall thickness on the WPS up to:

A PQR test coupon with a shell thickness of 'T' can generally be used to qualify a wall thickness on the WPS up to:

• A. T
• B. 2T
• C. 3T
• D. 0.5T

Answer: (B)

When you qualify a welding procedure, the PQR shows that the specified process and parameters produce acceptable welds on a test coupon of thickness T. Because heat input and cooling behavior change with thickness, the qualified wall thickness for the resulting WPS is typically allowed to be up to twice that tested thickness. In other words, a coupon of thickness T proves the procedure can weld and meet acceptance criteria for walls up to 2T. If you need to certify welds in thicker sections beyond 2T, you would need additional qualification with a thicker coupon to ensure the process behaves correctly under those conditions.

When you qualify a welding procedure, the PQR shows that the specified process and parameters produce acceptable welds on a test coupon of thickness T. Because heat input and cooling behavior change with thickness, the qualified wall thickness for the resulting WPS is typically allowed to be up to twice that tested thickness. In other words, a coupon of thickness T proves the procedure can weld and meet acceptance criteria for walls up to 2T. If you need to certify welds in thicker sections beyond 2T, you would need additional qualification with a thicker coupon to ensure the process behaves correctly under those conditions.