活性剂电弧焊机理的初步研究

本文针对不锈钢活性剂电弧焊过程,分析了不同种类活性剂(含单组分活性剂)对焊缝成形、接头熔深、电弧宏观形态的影响,并采用X射线透射微焦高速录像系统,观测了熔池内部液态金属的流动状态和特征,从而,对于不锈钢活性剂氩弧焊过程中出现的现象和相应的机理有初步的认识.实验结果表明,对比常规氩弧焊,在A-TIG焊接条件下,熔池液态金属流动具有剧烈的向内流动特征.进一步的探索性试验研究表明,活性剂技术--这种在钨极氩弧焊工业应用中已被普遍认可和接受的焊接技术很可能在其他弧焊领域得到更广泛的应用.

Preliminary Study on the Mechanism of Arc Welding With the Activating Flux

This paper deals with a basic understanding about arc welding with the activating flux.The effect of various fluxes on the penetration depth and welding arc profiles is investigated in conventional TIG welding of stainless steel. Arc contraction can be verified with the result of video observation. The fluid flow behaviour is visualized in real-time scale by the use of micro-focused X-ray transmission high-speed video observation system. Stronger inward fluid flow patterns leading to weld beads with narrower width and deeper penetration can be apparently identified in the case of A- TIG welding. It is understood that the activating flux, which draws a lot of attention in increasing welding penetration and improving welding productivity for TIG welding of stainless steel, will be possibly applied in other fields when more merits of the active flux are identified and qualified, such as eliminating undercutting in keyhole mode plasma arc welding of stainless steel.