SMAW-Fe II-3G(K)-12-Fef3j SMAW-FeIV-6G(K)-5/159-Fef3j GTAW-FeIV-6G-3/159-Fefs-02/10/12 GTAW-FeII-6G-6/48-Fefs-02/10/12SMAW-FeIII-6G(K)-4/57-Fef3JGTAW-FeIII-6G-3/57-Fefs-02/10/12分别是什么意思啊,求详解!