Final answer:
Before welding operations begin, a detailed welding procedure specification must be created and qualified to ensure the production of mechanically sound and reliable welds.
Step-by-step explanation:
Before welding operations are started, a detailed welding procedure specification shall be established and qualified to demonstrate that welds with suitable mechanical properties and soundness can be made by the procedure. This is essential to ensure that the welding process will result in safe and reliable joins. The welding procedure specification outlines the steps and techniques required, including the type of joint, base metals, filler metals, welding sequence, and post-weld heat treatment, among others.