管件（Pipe fitting）是管道系统中起连接、控制、变向、分流、密封、支撑等作用的零部件的统称。
Pipe bender is the most important equipment which is used for bending pipe fittings.
弯管机是管件弯曲加工的主要设备。
参考来源 - 智能数控弯管装备控制系统开发A set of the 3D standard pipe unit templates is constructed, which contains ten types of pipe units of different sizes, for the modeling of the 3D pipe network.
建立了三维标准管件的模板库，共包括十种类型不同尺寸的标准管件，以供管网建模时从中调用。
参考来源 - 三维管网地理信息系统的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
确认要焊接的管件都般配。
然后拆开用熔剂刷蘸上熔剂涂抹管件的两头以及配件内侧。
Then disassemble and use the flux brush to apply flux to the ends of the pipes and the insides of the fittings.
必要时可以另切一段，但是两个管件要套得刚刚好。
Cut another piece if you have to, but the two pieces should slide together with a snug fit.
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