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1 What are the types of weld defects? Which ones are defects that are not allowed to exist? 2 What defects are not allowed in the welded joints of pressure vessels? 3 What is the definition of regular inspection for pressure vessels? 4 What are the acceptable appearance standards for corner welds of pressure vessels? What value is specified for the weld coefficient of double-sided welded butt joints in 5GB150-2011? How is the general weld coefficient determined? In the assembly of 6 containers, how is the distance between two adjacent welds controlled? What are the regulations regarding the selection of welding materials used for manufacturing the pressure-bearing components of pressure vessels? 8 What are the items for regular inspection of pressure vessels? 9 What preparations must be made before entering a pressure vessel filled with flammable, explosive, oxidizing, toxic, or asphyxiating substances for inspection? 10. How are the weld joints of the stressed parts of pressure vessels classified according to their location? Which category do all the joints at the various convex end caps belong to, the circumferential joints where spherical end caps are connected to the cylinder, the joints at the small end of conical end caps and the pipe plates connecting to nozzles, the reinforcement rings at the joints between these components and the shell, and the joints between the shell itself?