Quality
Many distinct factors influence the strength of welds and the material around them, including the welding method, the amount and concentration of energy input, the weldability of the base material, filler material, and flux material, the design of the joint, and the interactions between all these factors. To test the quality of a weld, either destructive or nondestructive testing methods are commonly used to verify that welds are free of defects, have acceptable levels of residual stresses and distortion, and have acceptable heat-affected zone (HAZ) properties. Types of welding defects include cracks, distortion, gas inclusions (porosity), non-metallic inclusions, lack of fusion, incomplete penetration, lamellar tearing, and undercutting. Welding codes and specifications exist to guide welders in proper welding technique and in how to judge the quality of welds. Methods such as visual inspection, radiography, ultrasonic testing, dye penetrant inspection, Magnetic-particle inspection or industrial CT scanning can help with detection and analysis of certain defects.
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Famous quotes containing the word quality:
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—Marcel Proust (1871–1922)
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—Virginia Woolf (1882–1941)
“If behind the erratic gunfire of the press the author felt that there was another kind of criticism, the opinion of people reading for the love of reading, slowly and unprofessionally, and judging with great sympathy and yet with great severity, might this not improve the quality of his work? And if by our means books were to become stronger, richer, and more varied, that would be an end worth reaching.”
—Virginia Woolf (1882–1941)