Final answer:
Welders must have the required valid Welder performance qualification cards as per the Pressure Welders Regulation, ensuring they are qualified for the welding procedures used in pressure vessel applications and maintain safety standards.
Step-by-step explanation:
Welders and welding operators are required to meet specific regulations and hold the necessary certifications to perform their duties safely and effectively. According to the Pressure Welders Regulation, these professionals must have the required valid Welder performance qualification cards for the welding procedures they will use. This credential serves as proof that the welder has demonstrated the ability to perform welding according to the standards necessary for working on pressure vessels and other critical applications.
Having a valid welder performance qualification card is essential because it ensures that the individual has been adequately tested and is competent to conduct the welds in a manner that won't compromise the integrity of the pressure vessel or affect safety. Without such qualifications, the welder would not be allowed to work on projects that fall under the Pressure Welders Regulation. It's a critical requirement for quality assurance in industries where welding can have a significant impact on safety and operational reliability.