Welding Quality Inspectors are needed to inspect welds to be sure they have been performed according to contract requirements and are up to the specific state codes and standards in the industry. The inspector does this by performing visual inspections on the welded steel pieces, as well as testing them for possible defects. The inspector uses specific testing and measuring devices.
Basically, inspectors need to know about everything related to welding. They need to be knowledgeable about applicable codes and how to quickly look up any section when they need to verify and substantiate that a weld needs to be reworked. They need to know how to engage in nondestructive testing, be cognizant of the terminology applicable to the welding process and how different materials react when combined during the welding process.