Which factor is crucial in determining the acceptability of a weld?

The acceptability of a weld is fundamentally determined by its integrity and performance in service, which are best evaluated through nondestructive examination (NDE) results. NDE techniques, such as ultrasonic testing, radiographic testing, and magnetic particle testing, provide critical information about the internal and surface defects of a weld that may not be apparent through visual inspection or size measurement alone.

While visual appearance can provide initial insights into weld quality and weld size is essential for ensuring that the weld meets design specifications, these factors do not provide a complete assessment of the weld's structural integrity. The type of welding process used can influence the properties of the weld metal and heat-affected zone, but it does not directly determine the acceptability of the weld.

Nondestructive examination results are crucial because they can reveal any flaws that could compromise the weld's performance, such as cracks, incomplete fusion, slag inclusions, or porosity. Thus, while other factors contribute to the overall assessment of a weld, the outcome of NDE provides the definitive evaluation needed to determine if a weld is acceptable for service.