What is examined during a macro test fusion zone procedure?

During a macro test fusion zone procedure, the focus is on examining the microstructure of the fusion zone in a weld. This process involves cutting, polishing, and etching the welded specimen to reveal the structure of the weld metal as well as the heat-affected zone. By studying the microstructure, inspectors can assess characteristics such as grain size, presence of inclusions, porosity, and the overall integrity of the weld. This analysis is crucial for determining if the weld meets the necessary standards and specifications required for structural integrity.

Other aspects like the color of the weld material, the time taken to complete welding, or the size of the weld joint do not provide the in-depth information needed about the internal properties and quality of the fusion zone. While these factors can be relevant to the welding process or initial visual inspection, they do not replace the detailed insights gained from a microstructural examination.