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S32750二相鋼の溶接部におけるフェライト含有量が低い問題

2016-09-23View Original

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皆様、お尋ねしたいのですが、S32750二相鋼の母材のフェライト含有量は約40FNです。溶接には棒電極アーク溶接を用い、溶接棒の種類はE2594-16で、溶接電流はφ3.2の場合が約110A、φ4.0の場合が約130Aです。溶接後に溶接部のフェライト含有量を測定すると18~30FNの範囲になりますが、フェライト含有量が低くなる原因として考えられるものは何でしょうか?この問題をどう解決するか?

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