Why is it important to check for cleanliness before welding?

Checking for cleanliness before welding is crucial because it directly influences the quality and integrity of the weld. Clean surfaces ensure that there are no contaminants such as oil, rust, dirt, or other foreign materials that can interfere with the melting and fusion process during welding. When metal surfaces are clean, the likelihood of achieving a strong bond increases, which is essential to ensure the structural integrity and durability of the welded joint.

Contaminants can cause defects like porosity, inclusions, and insufficient fusion, which can significantly weaken the weld and lead to potential failure under stress. Therefore, promoting better bonding through cleanliness is fundamental to producing high-quality welds that meet safety and performance standards in metal fabrication.