Welding procedure qualification testing is used to verify that welding parameters can consistently produce sound welds. This article explains seven common tests used during procedure qualification, including visual testing, ultrasonic testing, radiographic testing, macroetches, bend tests, fillet break tests, and tensile testing. Each test evaluates different aspects of weld quality, such as fusion, penetration, strength, and internal discontinuities. The article also discusses situations where codes are not required and explains how prequalified welding procedures can sometimes eliminate the need for testing. Understanding these tests is essential for improving weld quality and preventing costly fabrication problems.