低合金耐热钢焊条CJR307的电弧特性与熔滴过渡行为研究

Study on the Arc Characteristics and Droplet Transfer of the Electrode CJR307 for Low Alloy Heat-resistant Steels

  • 摘要: 研究了金红石对低合金耐热钢焊条CJR307的电弧特性及熔滴过渡行为的影响规律。结果显示,金红石含量从0增加至8%(w)时,焊条短路时间概率分布特征值t50从6.56 ms逐渐降低至5.58 ms,电弧稳定性增加、飞溅减小,工艺性能显著改善。随着焊条药皮中金红石含量的增加,熔敷金属化学成分中C、Mn增加,Si降低;熔敷金属抗拉强度与屈服强度呈现增加的趋势,-20℃低温冲击功先增加后降低,在金红石含量为4%时,冲击功平均值达到128 J。

     

    Abstract: The effects of rutile on the arc characteristics and droplet transfer of the low alloy heat-resistant electrode CJR307 were investigated.Results showed that the eigenvalue of short-circuit time, defined as t50, decreased from 6. 56 ms to 5. 58 ms gradually with the increasing of rutile from 0 to 8% (w). Meanwhile, the spattering was reduced and the stability of arc was improved, indicating remarkable improvement in the weldability of electrode CJR307. With the increasing of rutile, which was used to replace the quartz, the mass fractions of C and Mn in the deposited metal increased, and that of Si decreased. Accordingly, the tensile strength and yield strength presented an increasing trend. However, the impact toughness increased first and then decreased at-20 ℃, and the average value of impact toughness reached 128 J when the addition of rutile reached 4% (w).

     

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