What is a common preparation step for welding?

Cleaning the surfaces is indeed a fundamental preparation step for welding. This practice is crucial because any contaminants such as rust, oil, dirt, or paint can adversely affect the quality of the weld. A clean surface ensures that the weld metal properly fuses with the base material, resulting in a stronger and more reliable joint. The removal of contaminants helps to prevent issues like porosity in the weld, which can lead to structural failures.

In welding, the integrity of the joint heavily depends on the physical connection between the metals being joined. Clean surfaces allow for optimal penetration of the welding material, producing a weld that is both aesthetically pleasing and structurally sound. This step typically involves mechanical cleaning methods, such as grinding or brushing, or chemical cleaning agents designed to effectively remove unwanted materials from the metal surfaces.