Though not always visible, welding is important to all kinds of objects, from the smallest items to cars, electronics, and buildings. Because welding affects people's lives, it is important that inspectors check the work of welders on a regular basis. Certified welding inspectors assure that welders adhere to strict guidelines and safety rules that keep both the welder and the end user safe. Welding inspectors also insure that welding jobs uphold the standards set by contract documents, codes, and industry associations. A certified welding inspector performs visual inspections and tests on welded steel pieces to be used in the construction of buildings, structures, and utilities. They must be able to notice possible welding defects, use test and measuring instruments, and monitor any repairs to faulty welds The American Welding Society offers the only certified welding inspector certification. The Certified Welding Inspector (CWI) certification is widely recognized, both nationally and internationally, in the welding industry. Successful companies have come to rely on this AWS certification when ensuring the highest level of quality workmanship.