Final answer:
In preparing an ASME WPS, the first step is to select the welding process and consumables, before conducting any qualification tests or submitting the WPS for approval.
Step-by-step explanation:
The first step in preparation of an ASME Welding Procedure Specification (WPS) is to B) Select the welding process and consumables. This initial step involves determining the appropriate welding methods and materials that will be used in the fabrication process, ensuring compatibility with the base metals and the requirements of the job. After selecting the appropriate welding process and consumables, and subsequently performing the welding procedure qualification test, the WPS is documented and submitted for approval if necessary.