Why is it important to avoid welding over paint or coatings?

Avoiding welding over paint or coatings is crucial primarily because these materials can release toxic fumes during the welding process, which poses significant health risks to the welder and anyone nearby. When paint burns, it can release harmful compounds and vapors that can be detrimental to respiratory health. Additionally, the presence of paint or coatings can adversely affect weld quality. These contaminants can create defects in the weld bead, such as porosity, which compromises the integrity and strength of the weld.

In contrast, if options suggested benefits from welding over these materials, they would not reflect the practical realities faced in a welding environment. Welding is a precise and demanding task, where the purity of the base metals is essential for achieving optimal results. Therefore, ensuring a clean and uncontaminated surface by removing any paint or coatings before welding contributes to a safer work environment and better weld quality.