Abbreviations, Terms, and Welding Symbols Abbreviations It is useful to have an understanding of acronyms utilized within the world of welding and also welding inspection. Some commonly utilized ones are: API:                  American Petroleum Institute ASME:             American Society of Mechanical Engineers BM:        base metal BS:                   British Standard BSI:                  British Standards Institute CVI:                 close visual inspection DT:                   […]