The elements can be put together in various ways. For example, a lap join may be held by a fillet, plug, or slot weld, and and a tee joint by a fillet or groove weld.
这些元素可以以不同方式组合在一起，例如：一个搭接接头可能用角接、塞焊和缝焊固定，一个丁字接头可以用一个搭接或槽焊来完成。
Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, choke plug, inside the wire, outside the wire, turned-over edge, increaser etc.
管件类：弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。
Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, choke plug, inside the wire, outside the wire, turned-over edge, increaser etc.
管件类：弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。
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