氧化物复合活性焊剂对聚焦光束焊接熔深的影响

Influence of oxide activating fluxes on weld penetration in light beam welding

研究了复合成份活性焊剂对于低碳钢聚焦光束焊接熔深的影响规律以及焊剂增加熔深的原因。结果表明,复合焊剂的配比是熔深增加量的最显著影响因素,并由此对配比进行了优化。在该配比下,复合焊剂增加熔深的效果优于单一成分活性焊剂。采用焊接热循环曲线检测系统,获得母材热影响区某点在焊接过程中的峰值温度。在母材不熔化状态下,比较涂敷焊剂和不涂焊剂时的峰值温度的变化,可知活性焊剂有效地增加了对光束的吸收率;在母材熔化状态下,比较焊剂涂敷量对测量点的峰值温度和熔深的影响规律发现,活性焊剂有改变熔池流动模式的作用。在聚焦光束活性焊接过程中,焊剂导致熔深增加的原因是焊剂对光束吸收率的提高以及焊剂改变了熔池的流动模式。

The influence of complex composition activating flux on the weld penetration in light beam welding was investigated,and the mechanism was discussed.The results show that the composition of flux has the largest influence on the penetration increment,and the optimal complex composition is found.Penetration increment obtained with this optimal composition flux is larger than that with single composition fluxes.The peak temperature of certain point near the heat affected zone can be measured according to the thermal curve monitoring system.When workpiece is not melted,the peak temperature of the point can be significantly increased in welding with fluxes,which implies that the fluxes can increase light absorption.And when workpiece is melted,the penetration and peak temperature varied in different trends with increasing fluxes amount,which implies that the fluxes can change the fluid flow pattern of the molten pool.In activating light beam welding,these two mechanisms cooperated and increased the weld penetration.