What is a common standard for determining the quality of a weld?

The common standard for determining the quality of a weld is AWS D1.1 for structural welding of steel. This standard, published by the American Welding Society, provides essential guidelines and requirements for the welding of structural steel assemblies to ensure the integrity and quality of welds. It covers various aspects of the welding process, including material specifications, welding techniques, inspection criteria, and qualifications for welders, ensuring that the welding meets industry standards for safety and performance.

The other standards mentioned serve different purposes. ISO 9001 is centered around quality management systems in any organization and does not specifically address welding quality. ASME B31.3 pertains to the design and construction of process piping systems, which involves various engineering standards, but it does not focus solely on weld quality. API 650 is relevant for the design and construction of welded tanks for oil storage and does not cover the general aspects of weld quality applicable across all steel structures like AWS D1.1 does. Thus, AWS D1.1 is the most recognized and widely applied standard for evaluating the quality of structural welds in the welding industry.