研究了金红石对低合金耐热钢焊条C JR307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.
The effects of rutile on the arc characteristics and droplet transfer of the low alloy heat-resistant electrode C JR307 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 C JR307.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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