本文件规定了热塑性模制部件中由于连接过程而产生的接头缺陷的质量等级。 本文件不描述在使用过程中或连接前可能产生的缺陷，例如装配不良。按照ISO23512 规定了三个质量等级，以便广泛应用以下连接工艺: a） 超声波焊接； b） 超声波点焊； c） 红外焊接； d） 热气对流焊接； e） 振动焊接； f） 旋转焊接； g） 激光焊接； h） 热板焊接；和 i） 热铆接:热风；电气、红外和超声波。 它们由符号B、C和D指定，其中B是最严格的。 质量水平是指生产质量，而不是制造产品的用途适合性。 注意了吗ISO/TC 138制定并维护了塑料管道、配件、阀门和/或辅助设备的连接标准，以及由此产生的接头性能评估标准。

This document specifies quality levels for imperfections in joints in thermoplastic moulded components due to the joining process. This document does not describe imperfections that can be generated either during service or present before joining, such as poor fit up. The correct preparation before joining is described in the relevant thermal joining process specification (TJPS), as defined in ISO？23512. Three quality levels are specified in order to permit application for a wide range of the following joining processes: a) ultrasonic welding; b) ultrasonic spot welding; c) infrared welding; d) hot gas convection welding; e) vibration welding; f) spin welding; g) laser welding; h) hot plate welding; and i) heat staking: hot air; electrical, infrared and ultrasonic. They are designated by symbols B, C and D, where B is the most stringent. The quality levels refer to production quality and not to the fitness for purpose of the manufactured product. NOTE？Standards on joining of plastic pipes, fittings, valves and/or auxiliary equipment, and the assessment of the properties of the resulting joints are developed and maintained by ISO/TC 138.