B30はどのような素材ですか？
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B30はどのような材質でできていますか？どうやって溶接するの？溶接中に保護が必要か？
B30銅ニッケル合金（バックラージ）のことですか？
B30銅ニッケル合金（ブロンズ）で、本体を溶接するのか、それとも炭素鋼やステンレス鋼と複合化するのか？
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