
BS EN ISO 21952. Welding consumables. Wire electrodes, wires, rods and deposits for gas-shielded arc welding of creep-resisting steels. Classification
出版:British Standards Institution

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BS EN ISO 21952. Welding consumables. Wire electrodes, wires, rods and deposits for gas-shielded arc welding of creep-resisting steels. Classification
出版:British Standards Institution
专家解读视频