ONORM M 7801 Teil 3-1981 Edge preparation shapes of grooves for submerged arc welding on steel《边缘加工 埋弧焊钢沟槽形状》.pdf

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NB T 47018.4-2017 承压设备用焊接材料订货技术条件 第4部分：埋弧焊钢焊丝和焊剂.pdf

NB T 47018.4-2011 承压设备用焊接材料订货技术条件 第4部分：埋弧焊钢焊丝和焊剂.pdf

NB T 47018.4-2011 承压设备用焊接材料订货技术条件 第 4 部分：埋弧焊钢焊丝和焊剂.pdf

NB T 47018.4-2017 承压设备用焊接材料订货技术条件 第4部分：埋弧焊钢焊丝和焊剂.pdf

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