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Effects of CeF_3 on properties of self-shielded flux cored wire

China Welding 2006年第2期15卷 31-33页

作者：喻萍田志凌潘川薛锦 National Engineering Research Center for Advance Steel Technology Central Iron & Steel Research Institute Xi’an Jiaotong University

Effects of CeF3 on properties of self-shielded flux cored wire including welding process, inclusions in weld metal and mechanical properties are systematically studied. Welding smoke and spatter are reduced with the addition of CeF3. The main non-metallic inclusions in weld metal are AlN and Al2O3. CeF3 can refine non-metallic inclusions and reduce the amount of large size inclusions, which is attributed to the inclusion floating behavior during the solidification of weld metal. The low temperature impact toughness is improved by adding suitable amount of CeF3 in the flux.

关键词： CeF3 self-shielded flux cored wire non-metallic inclusions notch toughness

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Effect of oxygen-containing additives on weld penetration in self-shielded flux cored arc welding

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China Welding 2015年第4期24卷 64-68页

作者：张占伟李午申 School of Materials Science and Engineering Tianjin University Tianjin 300072. School of Materials Science and Engineering Shenyang Aerospace University Shenyang 110136.

The effect of Fe203 and Liz CO3 additives in flux core on the weld metal oxygen content and weld penetration in self-shielded flux cored arc welding were studied schematically. The result shows that the oxygen content in the weld metal and weld penetration both increased with the Fe203 addition increased in the range of 5 wt. % to 20 wt. %. The oxygen content in the weld metal was increased with the Li2CO3 addition increased in the range of 1 wt. % to 8 wt. %. However, the weld penetration decreased when Li2CO3 addition exceeding 4 wt. %. High-speed photographic images show that when Fe2O3 addition influx core exceeding 15 wt. %, droplet became excessively large, so that spatters were frequently generated in large numbers. In this study, Fe203 and Li2 CO3 in the amount of 11 wt. % and 4 wt. %, respectively, jointly added in the flux core can achieve a deeper weld penetration with sound usability characteristics.

关键词： self-shielded flux cored wire weld penetration oxygen surface tension

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Investigation on mechanism of fixing nitrogen in self-shielded flux cored arc welding

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China Welding 1997年第1期6卷 28-33页

作者：张智陈邦固张文钺冯灵芝

Prevention of nitrogen porosity in weld metal deposited with self-shielded flux cored wire with CaF2-TiO2-MgO slag system can be accomplished by using a 'killing agent' such as titanium to react with nitrogen dissolved in the weld metal. The amount of titanium needed to prevent porosity is calculated thermodynamically for various dissolved nitrogen levels. Experimental flux cored wires are used to verify the thermodynamic model. It is concluded that approximately 0.11 wt% titanium in the weld deposit is need to prevent nitrogen porosity when welding without externally applied shielding.

关键词： self-shielded flux cored wire CaF_2-TiO_2-MgO slag system fixing nitrogen

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