API 1104, Section 3.1.19 Qualified welding procedure – a tested and proven detailed method by which sound _______ with suitable mechanical properties can be produced.

The question asks to complete the definition of a "Qualified welding procedure" as per API 1104, Section 3.1.19. The definition states: "a tested and proven detailed method by which sound __________ with suitable mechanical properties can be produced."

A welding procedure is designed to ensure that the actual welded joint, or the weld, meets specific quality and mechanical property requirements. The "suitable mechanical properties" refer to the characteristics of the finished weld.

• a. Surveys: Surveys are inspections or assessments, not the product of welding.
• b. X-Rays: X-rays are a method of non-destructive testing used to inspect welds, not the product itself.
• c. Welds: Welds are the actual fused connections made between materials. A "sound weld" is a high-quality weld free from defects and possessing the desired mechanical properties. This fits the context of the definition.
• d. Welding methods: Welding methods are the techniques or processes used (e.g., shielded metal arc welding, gas metal arc welding). The procedure itself is a detailed method, so producing "sound welding methods" doesn't make sense in this context.

According to API 1104, Section 3.1.19, a "Qualified welding procedure" is indeed defined as "a tested and proven detailed method by which sound welds with suitable mechanical properties can be produced."

The correct option is c).

c) Welds