What are some possible causes of slag inclusions in welding?

Slag inclusions in welding can occur due to several factors, with poor welding techniques and inadequate joint designs being significant contributors. When the welding technique is not appropriate, such as insufficient travel speed or improper manipulation of the welding arc, it can lead to inadequate fusion between the weld bead and the base material, causing slag to become trapped within the weld.

Similarly, poor joint design can hinder the flow of molten weld metal, preventing slag from effectively escaping. For instance, if the joint geometry does not allow for proper access to the weld pool, or if there are areas where slag can accumulate, this can further increase the likelihood of inclusions forming.

Taking these points into account establishes a clear understanding that maintaining good welding practices and ensuring appropriate joint design are critical to achieving high-quality welds free from defects such as slag inclusions.