This kind of nanostructured surface layer with compressive stress could significantly increase the fatigue strength of butt welded joint.
这种压应力纳米强化层可以明显地提高对接接头的疲劳性能。
Impact strength of fusion butt welding joint of polyethylene pipes was tested with a digital impact tester, and some actual fusion welding cases were commented.
应用仪器化冲击试验机对聚乙烯热熔对接焊的冲击性能进行了测试，并对几种实际焊接情况进行了分析。
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