What is the general approach for preparing a surface for welding?

The general approach for preparing a surface for welding emphasizes the need to remove all contaminants, including paint, rust, oil, and dirt. This is crucial because any foreign materials can impede the quality of the weld and compromise the strength and durability of the joint. By ensuring that the surface is completely free from contaminants, the welding process can achieve a proper fusion between the metals being joined, leading to a more reliable and strong weld.

Cleaning the surface thoroughly allows for better penetration of the weld, ensuring that the molten filler material can flow correctly into the joint and adhere to the base metals. This preparation often involves mechanical cleaning methods, such as grinding or sanding, as well as chemical cleaning agents that can effectively remove stubborn contaminants. Therefore, the approach of removing all contaminants aligns with best practices in welding preparation.