Abstract
The purpose of this study was to evaluate the temperature fluctuation induced by electromagnetic stirring (EMS) and to investigate the influence of temperature fluctuation on the appearance and microstructure of the stainless steel welds. CF8A and 308L were used for the base metal and weld metal, respectively. Bead-on-plate welding (BOP) was conducted with a linear welding machine of gas tungsten arc welding (GTAW) with EMS. The experimental results show that EMS could prompt temperature alteration rates (TARs) to fluctuate between positive and negative, and enlarge the max/min ratios. Smaller ripples and surface roughness would be induced on the welds, while the dilution and the depth-to-width ratios both decreased. As a result, the ferritic and austenitic grains become more isotropic and their grain sizes become smaller.
Highlights
Welding parameters are manipulated mainly to control the arc, which in turn could affect the formation of defects in welds [1,2]
It reveals that the patterns of ripples on the gas tungsten arc welding (GTAW) weld change periodically, but that those on the GTAW + electromagnetic stirring (EMS) weld are uniform and narrower, relatively
The measurements show that the average width of a GTAW weld is 9.765 mm with a standard deviation of 0.327, and that the one for a GTAW + EMS weld is 8.027 mm with a standard deviation of 0.262
Summary
Welding parameters are manipulated mainly to control the arc, which in turn could affect the formation of defects in welds [1,2]. The welding parameters employed could alter the microstructure-related properties such as the mechanical properites and corrosion resistance of welds [3]. The mechanical properties and corrosion resistance of weldments were improved as well [5,7,8,9,10]. Research studies on the application of electromagnetic force to gas metal arc welding and laser welding have been conducted in recent years [9,11,12,13].
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