How to determine the number of test pieces if the thickness of some towers or pressure vessel cylinders is different?
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Some towers or pressure vessel cylinders have different thicknesses, and standards or designs require welding test pieces. How should the number of test pieces be determined?
All things being equal, quantity is determined based on thickness specifications.
What does thickness coverage mean? This is a product welding test piece for pressure vessels, not a welding process qualification.
First of all, we must understand the meaning of welding test plate； The welding test plate is a standard block to verify whether this manufacturing process can meet the mechanical properties of the product. Note that this is to verify the manufacturing process. That’s why the standard says that a test panel is required for the same process, but different processes cannot be covered. Different thicknesses, if the difference is large, resulting in changes in welding grooves, welding parameters, and heat treatment parameters, they are not the same process.
Comparison of the requirements for welding test plates between GB 150-1998 and GB 150-2011.