Manufacturing Technology Today

H. S. Aujla ¹, R. Singh ²

Affiliations
1 Dept. of Mech. Engg., G. N. D. P. College, Ludhiana, IN
2 Dept. of Mech. & Prod. Engg., G. N. D. P. College, Ludhiana, IN

Abstract

An attempt has been made to apply cryogenic treatment for enhancing the machining characteristics of titanium alloys by cryo-treatment of work piece and tool in end milling operation. Further best r.p.m range for titanium alloy (Ti-6Al-4V) with H. S. S tool has been established. The specimen selected was a cryogenic treated cylindrical rod of 13 mm diameter, for which a cryogenic treated H. S. S end mill of 5mm diameter has been used to generate 2mm deep cavity. The mechanical properties have been observed to find the best range of machining. The results indicate that the best machining range comes out between 300-500 rpm. The results of the study shows that, Ra value improves by 47.91%, surface hardness increases by 2.25%, metal removal rate increases by 4.38% and tool wear rate decreases by 52.9%. The results of the study are also supported by photomicrographs.

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M. Chhabra ¹, R. Singh ²

Affiliations
1 Department of Mechanical Engg., MIT, Moradabad, IN
2 Dept. of Mechanical & Production Engg., GNDEC, Ludhiana, IN

Abstract

In the present work, the effect of heat input on weldability of austenitic stainless steel (AISI 304) in pulsed current GMAW has been investigated. The weldability has been investigated in terms of tensile properties (Ultimate Tensile Strength (UTS), Yield Strength (YS), and % elongation). Further results have been verified by SEM analysis and porosity content. The welding parameters were adjusted to achieve a weld bead contour corresponding to DIN 8563 class AS at different heat inputs.

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M. Chhabra ¹, R. Singh ²

Affiliations
1 Dept. of Mechanical Engg., MIT, Moradabad, IN
2 Dept. of Mechanical & Production Engg., GNDEC, Ludhiana, IN

Abstract

In this paper, the effects of heat input on weld characteristics in pulse gas metal arc welding (P-GMAW) of austenitic stainless steel is presented. The weld characteristics are Front Width (bi), Front Height (a1), Back Width (b2), Back Height (a2), Top Reinforcement Area (A1), Root Reinforcement Area (A3), Base Metal Fusion Area (A2), Weld Metal and Dilution D (%). AISI 304 stainless steel sheets of 2mm thickness in flat position were welded with pulse gas metal arc welding process to achieve a weld bead contour corresponding to DIN 8563 class AS at different heat inputs for investigating the effects of heat input on weld characteristics. The heat input varies by changing the input parameters such as mean current (I_m), welding speed (S), peak current (I_p), base current (I_b), pulse time (t_p), frequency (f). These pulse parameters have distinct effect on the welding characteristics.

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