Gas Tungsten Arc Welding process using ERNiCrMo-3 filler metal. It is commonly used in nuclear industries where the weldments are usually subjected to hot corrosion. Devendranath Ramkumar et al. (2015) proposed that weldment between Inconel 718 and AISI 430, using Gas Tungsten Arc Welding obtained from ER2553 and ERNiCrMo-4 fillers and that suggested and brought into the base metals for accumulate numerous benefits in terms of metallurgical and mechanical properties for aerospace and nuclear sectors. Devendranath Ramkumar et al. (2015) studied and reported about corrosion behavior of AISI 316L welds was investigated under 3.5% NaCl environment using Pulsed Current Gas Tungsten Arc Welding employed from two different fillers ER2553 and ERNiCr-3. It was fulfilled from the study that ERNiCr-3 exhibited better mechanical and corrosion properties and could be adopted to achieve optimal properties compared to over-alloyed filler.
In this present research, the machinability studies of TiAlN/TiCN, TiCN/TiAlN coated and uncoated inserts were investigated on machining custom 450 alloy. The machining input parameters such as feed rate (f), cutting speed (V) and depth of cut (d) are set using orthogonal array. The machining output parameters such as surface roughness, tool wear and cutting forces were studied for its parametric contribution and it was analyzed using Analysis of Variance (ANOVA). Further, the tool wear obtained was studied using scanning electron microscopic images and energy dispersive spectroscopy analysis was conducted to check the addition of work material elements to the coated tool surface. The results show that, the feed rate is the most contributing factor in deciding resultant forces, surface roughness and tool wear respectively. TiAlN/TiCN coated carbide tool has obtained improved machinability, when compared to TiCN/TiAlN coated carbide and uncoated carbide inserts. To obtain one optimal level for all three responses of three types of tools, multi criteria decision making approach, named utility concept approach is selected. Based on the MCDM analysis, it is found that trial number 4 gives better experimental output of improved surface integrity, lower resultant force and less tool wear for all types of tools.
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