When assessing parallel elongated slag inclusions (ESI), what is the maximum width of an individual inclusion for them to be considered a single indication?

When assessing parallel elongated slag inclusions (ESI), the maximum width of an individual inclusion for it to be classified as a single indication is 1/16". This standard is important because it helps ensure consistent evaluation and helps identify potential issues with weld quality.

The criteria for identifying slag inclusions are based on their dimensions and appearance. If inclusions are wider than 1/16", they are typically considered separate indications and could indicate a more significant concern regarding the weld quality. Monitoring the size of these inclusions is crucial for maintaining the structural integrity and reliability of welded joints, especially in pipelines and related facilities where safety is paramount. Thus, understanding this threshold helps inspectors determine the acceptability of welds per the API 1104 guidelines.