铁易焊接。
塑料有良好的加工性能，易成型，如：压、挤、吹、易切削、易焊接。
Plastic has very good nature for processing. It is easy to shape such as press, crush, blow, being cut or connected.
在役焊接过程中，管内流动介质的快速冷却，易使接头出现氢致裂纹。
Because of the fast cooling of flowing medium, the hydrogen cracking occurs easily under in-service welding.
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