多组元活性剂对TIG焊焊缝熔深的影响

Effect of Multi-component Active Fluxes on Penetration in TIG Welding

利用数理统计理论发展起来的配方均匀设计方法建立数学模型,研究了SiO2-MgO-TiO2-Cr2O3多组元活性剂。讨论了各组元对低合金高强钢TIG焊焊缝熔深的影响,揭示了活性剂的成分同熔深之间的内在关系,给出了活性剂成分与熔深之间的定量描述回归方程。结果表明:MgO与Cr2O3,MgO与TiO2,Cr2O3与TiO2交互作用对熔深起正交互作用,其交互作用结果使熔深增加;利用最佳成分配比做成活性剂配方A,在相同焊接工艺参数下,涂敷活性剂A的实测焊缝熔深是未涂活性剂焊缝的2.3倍;活性剂SiO2、Cr2O3、MgO在母材的阳极表面形成的导电性较差的熔融层,使得电弧导电通道变长和电弧等离子体发生收缩,熔深增加。

Based on uniform mixture experimental design, the regression model was set up and the SiO2-MgO-TiO2-Cr2O3 system multi-component active fluxes were investigated. The effects of active flux components on weld penetration of low alloy high strength steel in tungsten inert gas （TIG） welding were discussed, the regression equation of penetration with active flux components was developed, and the complex inherent relation between active flux components and penetration was revealed. The results show that the interactions between MgO and Cr2O3, MgO and TiO2, Cr2O3 and TiO2 increase the weld penetration; the penetration of welding bead coated with the active flux A baring the best mixture proportion is 2.3 times as much as that without it, under the same welding technological parameters; the fused layer with weak conductance formed by SiO2, Cr2O3, MgO on anodic surface of the basic material makes arc conductive path long, arc contracted, and penetration increased.