相談：Q345R+2507複合鋼とQ345R+S30403複合鋼の溶接にはどの溶接材を使うべきか
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専門家のご解答をお願いします：Q345R+2507とQ345R+S30403という2種類の複合鋼を溶接する際、過渡層と表面層にそれぞれどのような溶接材料を使用すべきでしょうか？長い間探したけど見つからなくて、達人の方に助けをお願いします
過渡層はあまり明確ではなく、表層にはJ507を使用する。
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