Final answer:
It's not true that all welding must be covered by a Welding Procedure Specification (WPS). A WPS is standard for quality control, but it may not be used for every welding operation, especially in non-critical or hobbyist applications.
Step-by-step explanation:
The statement that all welding is covered by a Welding Procedure Specification (WPS) is not entirely true. While it is a standard practice in professional environments to use a WPS for quality control, not all welding operations use WPS. A WPS is a document that describes how welding is to be carried out in production and is required by certain codes and standards. However, some minor or non-critical applications, hobbyist work, or situations where codes do not require a WPS might not utilize one. Additionally, specific sectors may have different requirements for WPS usage.