What is the recommended action if a weld bead shows signs of porosity?

When a weld bead exhibits signs of porosity, the recommended action is to inspect for contamination in the welding area. This is crucial because porosity can result from contaminants such as oil, grease, rust, or moisture on the base metal or in the welding environment. Contaminants can create gas pockets within the weld as it solidifies, leading to weak points and structural integrity issues.

By identifying and addressing the sources of contamination, welders can ensure a cleaner welding environment, which is essential for producing high-quality welds. Taking this proactive measure helps in achieving better penetration and overall weld quality, reducing the likelihood of porosity reoccurring in future welds. This approach is fundamental to effective MIG welding practices, prioritizing cleanliness and proper preparation in the welding process.