活性剂增加不锈钢A-TIG焊熔深机理研究

目的研究涂敷活性剂条件下1Cr18Ni9Ti奥氏体不锈钢的熔深增加机理。方法采用B1活性剂,涂敷在1Cr18Ni9Ti奥氏体不锈钢表面,进行A-TIG焊试验,分析活性剂对电弧形貌、阳极斑点、电弧电压和焊缝熔深的影响情况。结果涂敷活性剂后,电弧和阳极斑点都发生了收缩,电弧宽度由4.97 mm变为4.12mm,减小了17.1%,阳极斑点长轴长度由9.92 mm变为8.22 mm,短轴长度由4.75 mm变为4.35 mm,电弧电压提高了2.7 V,阳极区和弧柱区收缩,提高了弧柱电场强度;相同参数下,涂敷活性剂后熔宽缩小0.62mm,熔深增加了3.01 mm,显著增加熔深。结论阳极斑点收缩和电弧收缩是活性剂增加不锈钢A-TIG焊熔深的主要原因。

Mechanism of Increasing Penetration of Stainless Steel A-TIG Welding by Active Flux

The paper aims to study mechanism of increasing penetration of 1Cr18Ni9Ti austenitic stainless steel with self developed active flux. A-TIG welding experiments were carried out on 1Cr18Ni9Ti austenitic stainless steel surface with active flux. Changes of arc morphology, anode spot, arc voltage and penetration morphology before and after the coating of B1 active flux were analyzed. Both the arc and the anode spots were shrunk after application of active flux. The arc width changed from 4.97 mm to 4.12 mm by 17.1%, which reduced the length of anode spot from 9.92 mm to 8.22 mm. The length of short axis changed from 4.75 mm to 4.35 mm, and the arc voltage increased by 2.7 V. Shrinkage of positive column and arc column increased the electric field intensity of arc column; under the same parameters, the arc shrank after the application of the active flux, and the width of the arc after the coating of the active flux decreased by 0.62 mm, and the penetration depth increased by 3.01. Anode spot shrinkage and arc shrinkage are the main reasons of increasing penetration of stainless steel A-TIG welding with active flux.