目前有三种不同类型：带螺纹的，碰焊，承插焊接。
The end flange is available in either threaded, or socket-weld styles.
目前有三种不同类型：带螺纹的，碰焊，承插焊接。
There are available in three different kinds: threaded, butt-weld, and socket weld.
目前有三种不同类型：带螺纹的，碰焊，承插焊接。
There are available in three different kinds: threaded, butt-weld, and socket weld.
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