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UNS S31603 Stainless Steel Tungsten Inert Gas Welds Made with Microparticle and Nanoparticle Oxides

机译：由微粒和纳米氧化物制成的UNS S31603不锈钢钨极惰性气体保护焊

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The purpose of this study was to investigate the difference between tungsten inert gas (TIG) welding of austenitic stainless steel assisted by microparticle oxides and that assisted by nanoparticle oxides. SiO2 and Al2O3 were used to investigate the effects of the thermal stability and the particle size of the activated compounds on the surface appearance, geometric shape, angular distortion, delta ferrite content and Vickers hardness of the UNS stainless steel TIG weld. The results show that the use of SiO2 leads to a satisfactory surface appearance compared to that of the TIG weld made with Al2O3. The surface appearance of the TIG weld made with nanoparticle oxide has less flux slag compared with the one made with microparticle oxide of the same type. Compared with microparticle SiO2, the TIG welding with nanoparticle SiO2 has the potential benefits of high joint penetration and less angular distortion in the resulting weldment. The TIG welding with nanoparticle Al2O3 does not result in a significant increase in the penetration or reduction of distortion. The TIG welding with microparticle or nanoparticle SiO2 uses a heat source with higher power density, resulting in a higher ferrite content and hardness of the stainless steel weld metal. In contrast, microparticle or nanoparticle Al2O3 results in no significant difference in metallurgical properties compared to that of the C-TIG weld metal. Compared with oxide particle size, the thermal stability of the oxide plays a significant role in enhancing the joint penetration capability of the weld, for the UNS stainless steel TIG welds made with activated oxides.
机译：本研究的目的是研究奥氏体不锈钢在微粒氧化物辅助下的钨极惰性气体（TIG）焊接与纳米氧化物辅助下的惰性气体之间的区别。 SiO2和Al2O3用于研究UNS不锈钢TIG焊缝的热稳定性和活性化合物的粒径对表面外观，几何形状，角度畸变，δ铁素体含量和维氏硬度的影响。结果表明，与用Al2O3制成的TIG焊相比，使用SiO2可获得令人满意的表面外观。与由相同类型的微粒氧化物制成的TIG焊缝相比，由纳米颗粒氧化物制成的TIG焊缝的表面外观具有更少的熔渣。与微粒SiO2相比，用纳米SiO2进行的TIG焊具有潜在的优势，即焊缝熔深高，焊缝角度变形小。用纳米颗粒Al2O3进行TIG焊接不会显着增加熔深或减少变形。用微粒或纳米颗粒SiO2进行的TIG焊接使用功率密度更高的热源，从而使不锈钢焊接金属的铁素体含量和硬度更高。相反，与C-TIG焊缝金属相比，微粒或纳米颗粒Al2O3的冶金性能没有显着差异。与氧化物粒度相比，氧化物的热稳定性在增强焊缝的焊缝渗透能力方面起着重要作用，对于用活性氧化物制成的UNS不锈钢TIG焊缝而言。

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