低碳钢A-TIG焊的活性剂研制

Study activating flux for mild steel

研究了表面活性剂对低碳钢TIG焊的影响。在分析各单一活性剂对焊缝熔深、表面成形影响规律的基础上 ,确定了活性剂的基本组成体系。利用正交试验法对多组元配方进行了研究 ,得出了各组元百分含量变化对焊缝熔深的影响规律 ,SiO2 含量为4 0 %时对焊缝熔深的影响最为显著 ,TiO2 和Cr2 O3 在含量小于 30 %时对焊缝熔深的增加作用明显 ,卤化物含量较小时对焊缝熔深的增加作用明显。考虑焊缝的表面成形 ,得到由CaF2 、SiO2 、TiO2 、Cr2 O3 等组成的低碳钢A -TIG焊活性剂 ,可使焊缝熔深增加 3倍 ,在正常焊接规范条件下 ,不开坡口可将 12mm厚低碳钢钢板对接一次焊透 ,表面成形良好。

The effect of activating fluxes on TIG welding of mild steel is studied in this paper. On the bases of analyzing the regulation that affects the penetration and shape of weld, the base component of flux be confirmed. Multi-component compounding is investigated by using orthogonal method, thus the influence pattern of the mass fractions of individual components on the penetration is obtained finally. It has marked effect on the penetration when the mass fraction of Si02 is 40%. It has distinct effect on the penetration when the mass fraction of Ti02 and Cr203 less then 30%. It has distinct effect on the penetration when the mass fraction of halide is on small scale. Considering the appearance of weld, presented activating flux made up of Si02, Ti02, Cr203 and halide for A-TIG welding of mild steel. So that the optimal compounding can made the penetration deepened by triple, be able to weld through mild steel plate hi thickness of 12 mm once and away without groove preparation on the normal welding conditions, appearance of weld is elegant.