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Effect of shielding gas on the properties and microstructure of melted steel surface using a TIG torch

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Figure

Figure 1.  Schematic TIG melted surface. a) Sample’s dimensions and location of thermocouple b) location of melted track and welding direction
Table 2. Thermal properties of the parent material and shielding gases used in this research
Figure 3. Temperature versus time registered by each thermocouple a) Argon, b) Nitrogen  and c) Helium
Figure 4 shows selected cross-sectional areas of the melted region for specimens obtained at 75 mm, 150 mm and 225 mm positions, respectively, from the start of melting, along the direction of the melt track
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