20MnMoNi55钢焊接氢致延迟裂纹的产生及返修实例
20MnMoNi55강한접경치연지렬문적산생급반수실례
Generation reason and repair welding of hydrogen-induced crack after weld-ing of 20MnMoNi55 steel ing of 20MnMoNi55 steel
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