What is a common defect that can occur due to improper welding practices?

Porosity is a common defect that arises from improper welding practices, particularly in the context of the welding process where gas entrapment occurs. This defect typically manifests as small cavities or voids within the weld metal, which can weaken the structure and compromise the overall integrity of the weld.

The introduction of moisture or contaminants, inadequate shielding gas coverage, or improper travel speed during welding can lead to the inclusion of gas bubbles in the molten weld pool. These gases may not escape before solidification, resulting in porosity. Additionally, welding in unfavorable environmental conditions, such as high humidity, can also contribute to this defect.

Understanding porosity is crucial for weld quality, as it can significantly reduce strength and durability. Hence, inspectors must be vigilant in identifying and mitigating factors that lead to porosity during welding operations to ensure the reliability and safety of welded structures.