测试和分析了聚乙烯管道热熔对接焊接头的结晶度、硬度、拉伸性能和冲击性能，并与基材的性能进行了比较。

Crystallinity, hardness, tensile strength and impact toughness of fusion welding joint of polyethylene pipes are tested and analyzed.

youdao

试验结果表明，焊接热量对接头的力学性能有着显著的影响。

The results show welding heat input has a remarkable effect on the mechanical properties of the joint.

youdao

所有对接、T型槽和弯管接头都要完全侵入连接到焊接接头上。

All butt, grooved t, and corner joints shall be complete joint penetration weld joints.

youdao