What method can help in preventing slag inclusion?

Preventing slag inclusion is crucial for ensuring the integrity and quality of welded joints. Each of the methods listed contributes to reducing the likelihood of slag being trapped within the weld.

Proper joint fit up ensures that there is enough space for the molten weld metal to flow without becoming contaminated by slag or other impurities. If the joint fit is poor, it can lead to incomplete fusion and more opportunities for slag to become entrapped.

Using low hydrogen electrodes is critical because these electrodes produce a cleaner weld with fewer impurities. They are specifically designed to minimize the amount of hydrogen and, consequently, reduce the risk of hydrogen-induced defects, which can include slag inclusions.

Adequate interpass cleaning is also essential. This involves cleaning the weld area between passes to remove any slag, oxides, or other contaminants that may have accumulated. Failing to clean between passes can lead to these contaminants being trapped in the weld metal as it solidifies.

Combining all these methods—ensuring a proper joint fit, utilizing low hydrogen electrodes, and maintaining excellent interpass cleaning—creates a comprehensive approach to minimize slag inclusion in welds, making the chosen answer the most effective strategy.