Yu Ping

Pan Chuan

Department of Welding Research,

Central Iron and Steel

Research Institute,

Beijing 100081, China

Xue Jin

School of Materials Science

and Engineering,

  Xi’an jiaotong University,

Xi’an 710049, China

Li Zhengbang

Department of Metallurgical Technology,

Central Iron and Steel

Research Institute,

Beijing 100081, China

EFFECT OF Fe₂O₃ ON WELDING

TECHNOLOGY AND MECHANICAL
PROPERTIES OF WELD METAL
DEPOSITED BY SELF-SHIELDED FLUX CORED WIRE

Abstract: Five experimental self-shielded flux cored wires are fabricated with different amount of Fe₂O₃ in the flux. The effect of Fe₂O₃ on welding technology and mechanical properties of weld metals deposited by these wires are studied. The results show that with the increase of Fe₂O₃ in the mix, the melting point of the pretreated mix is increased. LiBaF3 and BaFe₁₂O₁₉, which are very low in inherent moisture, are formed after the pretreatment. The mechanical properties are evaluated to the weld metals. The low temperature notch toughness of the weld metals is increased linearly with the Fe₂O₃ content in the flux due to the balance between Fe₂O₃ and residual Al in the weld metal. The optimum Fe₂O₃ content in flux is 2.5%~3.5 %.

Key words: Self-shielded flux arc welding  Fe₂O₃  Welding technology  Mechanical properties