... 焊剂 soldering fluxes 焊接用保护气 protective gases for welding 焊接用化学品 welding chemicals ...
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... 焊接用保护气 Welding (Protective gases for –) 焊接用保护气 Gases (Protective –) for welding 焊接用保护气体 Protective gases for welding ...
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... 氦 Helium 焊接用保护气 Welding (Protective gases for -) 焊接用保护气 Gases (Protective -) for welding ...
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焊接用保护气体 Protective gases for welding ; shielding gas for welding
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