Effects of activating fluxes on the weld penetration and corrosion resistant property of laser welded joint of ferritic stainless steel

Yonghui Wang; Shengsun Hu; Junqi Shen

doi:10.1117/12.2199289

15 October 2015 Effects of activating fluxes on the weld penetration and corrosion resistant property of laser welded joint of ferritic stainless steel

Yonghui Wang, Shengsun Hu, Junqi Shen

Author Affiliations +

Proceedings Volume 9673, AOPC 2015: Micro/Nano Optical Manufacturing Technologies; and Laser Processing and Rapid Prototyping Techniques; 967304 (2015) https://doi.org/10.1117/12.2199289
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

This study was based on the ferritic stainless steel SUS430. Under the parallel welding conditions, the critical penetration power values (CPPV) of 3mm steel plates with different surface-coating activating fluxes were tested. Results showed that, after coating with activating fluxes, such as ZrO₂, CaCO₃, CaF₂ and CaO, the CPPV could reduce 100~250 W, which indicating the increases of the weld penetrations (WP). Nevertheless, the variation range of WP with or without activating fluxes was less than 16.7%. Compared with single-component ones, a multi-component activating flux composed of 50% ZrO₂, 12.09% CaCO₃, 10.43% CaO, and 27.49% MgO was testified to be much more efficient, the WP of which was about 2.3-fold of that without any activating fluxes. Furthermore, a FeCl₃ spot corrosion experiment was carried out with samples cut from weld zone to test the effects of different activating fluxes on the corrosion resistant (CR) property of the laser welded joints. It was found that all kinds of activating fluxes could improve the CR of the welded joints. And, it was interesting to find that the effect of the mixed activating fluxes was inferior to those single-component ones. Among all the activating fluxes, the single-component of CaCO₃ seemed to be the best in resisting corrosion. By means of Energy Dispersive Spectrometer (EDS) testing, it was found that the use of activating fluxes could effectively restrain the loss of Cr element of weld zone in the process of laser welding, thus greatly improving the CR of welded joints.

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Yonghui Wang, Shengsun Hu, and Junqi Shen "Effects of activating fluxes on the weld penetration and corrosion resistant property of laser welded joint of ferritic stainless steel", Proc. SPIE 9673, AOPC 2015: Micro/Nano Optical Manufacturing Technologies; and Laser Processing and Rapid Prototyping Techniques, 967304 (15 October 2015); https://doi.org/10.1117/12.2199289

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KEYWORDS

Chromium

Corrosion

Laser welding

Zirconium dioxide

Metals

Chemical elements

Laser processing

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