AWS A1。1:2016以1998年7月28日《美国联邦公报》公告《公制计量:美国国际单位制的解释》中定义的国际单位制（SI）为基础。（附件D中引用了其他源文件和样式指南）。本指南包含国际单位制基本单位、衍生单位、前缀的规范，以及AWS文件和焊接行业使用这些单位的规则。它还包含从美国习惯单位转换为国际单位制的因素和规则，以及对行业管理转换的建议。

AWS A1.1:2016 is based on the International System of Units (SI) as defined in the U.S. Federal Register notice of July 28, 1998, "Metric System of Measurement: Interpretation of the International System of Units for the United States". (Other source documents and style guides are referenced in Annex D.) This guide contains specifications of the SI base units, derived units, prefixes, and rules for their use in AWS documents and by the welding industry. It also contains factors and rules for converting from U.S. customary units to SI units and recommendations to industry for managing the transition.