What does the WPS specify about cleaning between welding passes?

What does the WPS specify about cleaning between welding passes?

• A. The technique for how the joint should be cleaned initially and between passes, including mechanical and chemical cleaning.
• B. The cleaning method used only after welding is complete.
• C. Cleaning is not specified in a WPS.
• D. Cleaning must be done only with chemical cleaners.

Answer: (A)

Cleaning between passes is controlled to ensure each pass fuses properly and the weld remains sound. The WPS specifies how the joint should be cleaned at the start and between passes, outlining acceptable mechanical methods (like wire brushing or grinding) and chemical methods (such as degreasing or pickling) as appropriate for the material and process. This keeps oxide films, scale, oil, grease, and other contaminants from interfering with fusion or trapping porosity, ensuring consistent bonding for every pass. It isn’t limited to cleaning after welding, and it isn’t restricted to chemical cleaners only—the WPS defines the appropriate cleaning approach for both initial preparation and between passes.

Cleaning between passes is controlled to ensure each pass fuses properly and the weld remains sound. The WPS specifies how the joint should be cleaned at the start and between passes, outlining acceptable mechanical methods (like wire brushing or grinding) and chemical methods (such as degreasing or pickling) as appropriate for the material and process. This keeps oxide films, scale, oil, grease, and other contaminants from interfering with fusion or trapping porosity, ensuring consistent bonding for every pass. It isn’t limited to cleaning after welding, and it isn’t restricted to chemical cleaners only—the WPS defines the appropriate cleaning approach for both initial preparation and between passes.