316L不锈钢TIG焊增材电弧物理特性分析

Analysis of physical characteristics of TIG arc welding for 316L stainless steels

在TIG焊增材制造过程中,电弧的往复加热不仅改变了增材构件的成形质量、组织性能,对电弧等离子体的辐射强度、温度也有很大影响。采用φ1.0 mm的316L不锈钢焊丝进行单道多层堆积,研究316L不锈钢TIG焊增材电弧物理特性。根据电弧增材成形系统的特点,建立TIG焊增材电弧光学采集试验系统,获取增材电弧的光谱信息及电弧图像。采用相对强度法计算不同层的电弧温度,分析堆积的前4层成形不稳定的现象,得出了增材层数对电弧形态及电弧温度的影响规律。加深了对TIG焊电弧对增材成形的影响机理的理解,为实现电弧增材制造过程质量自动控制奠定了基础。

In the manufacturing process of TIG welding augmented material,the reciprocating heating of arc not only changes the forming quality,microstructure and properties of augmented material components,but also has a great influence on the radiation intensity and temperature of arc plasma.In this paper,316L stainless steel welding wire with a diameter of 1.0 mm was deposited in a single channel and multi-layer to study the arc physical characteristics of augmented 316L stainless steel TIG welding.According to the characteristics of arc augmentation forming system,an optical acquisition test system for TIG welding augmentation arc was established to obtain the spectral information and arc image of augmentation arc.The arc temperatures of different layers were calculated by relative strength method.The unstable phenomena of the first four layers were analyzed.The influence of the number of additional layers on arc shape and arc temperature was obtained.It is helpful to understand the mechanism of TIG welding arc influence on augmentation forming and lay a foundation for the realization of automatic quality control in arc augmentation manufacturing process.