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Visnu Kumar Tiwari

Bio: Visnu Kumar Tiwari is an academic researcher. The author has contributed to research in topics: Ultimate tensile strength & Welding. The author has an hindex of 1, co-authored 1 publications receiving 24 citations.

Papers
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Journal ArticleDOI
30 Apr 2014
TL;DR: In this paper, the results were compared for different joints made by TIG and MIG welding processes and it was observed that TIG welded dissimilar metal joints have better physical properties than MIG-welded joints.
Abstract: The dissimilar metal joints of have been emerged as a structural material for various industrial applications which provides good combination of mechanical properties like strength, corrosion resistance with lower cost. Selections of joining process for such a material are difficult because of their physical and chemical properties. The stainless steel and mild steel dissimilar material joints are very common structural applications joining of stainless steel and mild steel is very critical because of carbon precipitation and loss of chromium leads to increase in porosity affects the quality of joint leads deteriorate strength. In the present study, stainless steel of grades 202, 304, 310 and 316 were welded with mild steel by Tungsten Inert Gas (TIG) and Metal Inert Gas (MIG) welding processes. The percentage dilutions of joints were calculated and tensile strength of dissimilar metal joints was investigated. The results were compared for different joints made by TIG and MIG welding processes and it was observed that TIG welded dissimilar metal joints have better physical properties than MIG welded joints.

30 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors proposed the use of a pulse plasma MIGW system to regulate the heat input during the welding process and found that its lower droplet temperature and decreased cooling rate during welding would suppress the formation of Fe2Al5 and FeAl3.
Abstract: Arc welding of aluminium and steel joins are commonly inundated by the formation of brittle intermetallic compounds (IMC) at the aluminium-steel interface. As the formation of IMC is closely related to the heat input into the base metals, it is hypothesised that the ability to regulate the heat input would enable the control of the thickness of IMC. This paper proposes the use of a pulse plasma MIGW system to regulate the heat input during the welding process. A shadowgraph method was used to compare the weld droplet stability of the pulse plasma MIGW with a pulse MIGW system. It was found that the plasma MIGW generated a regular heat input into the base metal due to the smoothness of the droplet detachment and resulted in the formation of IMC with uniform thickness. Al/steel joining was then conducted using both pulsed plasma MIGW and pulse MIGW systems, and the resulting IMC formations and thicknesses were evaluated. It was found that the formation and thickness of IMC in Al/steel dissimilar welding can be controlled by using pulse plasma MIGW. Its lower droplet temperature and decreased cooling rate during welding would suppress the formation of Fe2Al5 and FeAl3, and thus decreasing the overall thickness of IMC at the joining interface.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the change in microstructures and hardness values in fusion zone (FZ) and heat-affected zone (HAZ) of austenitic stainless steel and carbon steel welds were discussed.
Abstract: The purpose of this study was to discuss the change in microstructures and hardness values in fusion zone (FZ) and heat-affected zone (HAZ) of austenitic stainless steel and carbon steel welds. By comparison, the morphology of δ – Ferrite which formed in the fusion zone of single-pass and multi-pass welding was analyzed. The columnar dendritic shape can be seen as features extending from the fusion line of a weld pass toward the subsequent passes. Furthermore, the δ-Ferrite morphology changed from fine cellular to columnar dendrite or equiaxed dendrite. The recrystallization phenomenon was only observed in the HAZ carbon steel side of multi-pass welding. This zone was divided into HAZ-1 (grain-refining region) and HAZ-2 (partial grain-refining region). The hardness values in each zone were measured with the highest value was on fusion boundary of carbon steel side. Transverse tensile was carried out.

14 citations

Journal ArticleDOI
TL;DR: In this paper, TIG welding was carried out on mild steel (IS 2062) plates with super Duplex ER2594 filler and the results of micro hardness and micro structure were studied over welded area and base material.

8 citations

Journal ArticleDOI
TL;DR: In this paper , structural stainless steel (SS) 316L was tested at low temperatures with varying low temperatures of −80, −60, −30, and 20 °C.

7 citations

Journal ArticleDOI
TL;DR: In this article, by using split Hopkinson pressure bar (SHPB) technique, the authors used ASTM A240/A240M 304 structural stainless steel is a widely used structural material in civil engineering.
Abstract: ASTM A240/A240M 304 structural stainless steel is a widely used structural material in civil engineering. In this study, by using the split Hopkinson pressure bar (SHPB) technique, the dyna...

6 citations