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Effect of chemical composition of welding consumable on slag formation and corrosion resistance
Welding in the World ( IF 2.1 ) Pub Date : 2021-01-18 , DOI: 10.1007/s40194-020-01059-y
Yoona Lee , Jonghoon Jang , Stephen Liu

In the automotive industry, it is essential to reduce the weight of the car body to improve fuel efficiency and reduce CO2 gas emissions. As such, the application of advanced high-strength steels is rapidly increasing. However, in the case of gas metal arc (GMA) welding of advanced high-strength steels (AHSS), slag particles are observed to form on the weld surface resulting in poor corrosion resistance. The presence of slag particles on the weld also affects mechanical performance. This paper focuses on the degradation of corrosion resistance due to these slag particles. Current methods to decrease slag islands are costly as they attempt (1) to better protect the weld pool by decreasing the content of oxygen-containing ingredients or increasing argon in the shielding gas and (2) to mechanically clean the weld surface using processes such as shot blasting after gas metal arc welding (GMAW). In this study, the amount of slag was reduced by adjusting the chemical composition of welding consumables. Silicon was decreased to minimize silica/silicate formation, and sulfur was adjusted to affect the surface tension balance of the molten pool. Slag particles were observed to flow along the welding direction to solidify into a large particle in the weld crater that could be removed easily. In a separate consumable, Si and Mn contents were adjusted to form Mn3O4 and SiO2 slag. The use of these two welding consumables reduced the amount of slags, which improved the corrosion resistance. It is not the intent of this paper to compare the performance of these two experimental consumables, however.



中文翻译:

焊接材料化学成分对熔渣形成和耐蚀性的影响

在汽车工业中,减轻车身重量以提高燃油效率和减少CO 2至关重要气体排放。因此,先进的高强度钢的应用正在迅速增加。但是,在高级高强度钢(AHSS)的气焊(GMA)焊接中,观察到熔渣颗粒形成在焊缝表面,导致耐蚀性较差。焊缝上熔渣颗粒的存在也会影响机械性能。本文着重于这些炉渣颗粒导致的耐蚀性下降。当前减少炉渣岛的方法成本高昂,因为它们试图(1)通过减少保护气体中含氧成分的含量或增加氩气来更好地保护焊池,以及(2)使用诸如气体保护金属电弧焊(GMAW)后的抛丸清理。在这个研究中,通过调整焊接材料的化学成分,减少了炉渣的数量。减少硅以最小化二氧化硅/硅酸盐的形成,并调节硫以影响熔池的表面张力平衡。观察到炉渣颗粒沿着焊接方向流动,以固化成焊缝火山口中的大颗粒,很容易清除。在单独的消耗品中,调整Si和Mn的含量以形成Mn3 O 4和SiO 2炉渣。这两种焊接材料的使用减少了炉渣的数量,从而提高了耐腐蚀性。但是,比较这两种实验耗材的性能并不是本文的目的。

更新日期:2021-01-19
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