Abstract
The objective of this study was to analyze the flux-cored arc welding (FCAW) welding parameters and microhardness levels on surface quality of 410 NiMo martensitic stainless-steel coatings. The parameters of the FCAW process applied to the coating, included pulsation frequency, voltage, welding speed, average current and contact tip to work distance. The welding was carried out by the pulsed tubular wire process with pulsed current, constant voltage, Ar+2% O2 shielding gas and short-circuit metal transfer for the deposition of EC410 NiMo Martensitic Steel Deposits alloy coatings on a SAE 1020 steel substrate. For the statistical analysis, the Taguchi experimental planning was applied to test the influence of the parameters of the FCAW process (average current, CTWD, pulsation current and welding speed) on the coating properties. The best configuration with respect to the increased microhardness of the fusion zone in the coating welding process is: Average Current 200 A; CTWD 40 mm; Pulsation Frequency 26.31 Hz and Welding Speed 300 mm min.-1. The lowest microhardness of the melting zone in the coating welding process is: Average Current 170 A; CTWD 30 mm; Pulsation Frequency 23.26 Hz and Welding Speed 400 mm min.-1.
Highlights
The aim of this work was to determine which welding variables influenced the microhardness in the welding coating, by means of analysis of the fusion zone, the zone thermally affected and the base metal
The macrograph of the weld bead was developed with 4% Nital reagent for 1 min. to reveal the melting zone, the thermally affected zone and the base metal
More specific and detailed results of microhardness values are illustrated in Figure 4, highlighting the fusion zone with higher microhardness levels, mainly in the outer layer of the coating
Summary
The welding process with dissimilar metals are suitable for obtaining a surface suitable for wear or corrosion, and during welding there are variations in temperature and plastic deformations in the parts, resulting in changes in microstructure and its mechanical properties. The welding coating process with stainless steel is defined as the deposition of a layer of stainless steel on carbon steel or low alloy steel surfaces to produce coatings with anti-corrosive properties and necessary strengths to cope with environments subject to wear due to corrosion or cavitation, and the results obtained using welding made this quite attractive according Qiu, Wang, Wu, and Likhachev (2015). The coating is applied for the recovery and maintenance of parts due to wear, as well as in the construction of components or products in the manufacturing process
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