Browsing by Author "Badheka, Vishvesh"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Pipe-to-pipe friction welding of dissimilar Al-SS joints for cryogenic applications
    (Brazilian Society of Mechanical Sciences and Engineering, 2020-02-01) Vyas, Hardik; Mehta, Kush; Badheka, Vishvesh; Doshi, Bharat; Department of Mechanical Engineering; Advanced Manufacturing and Materials; Pandit Deendayal Petroleum University; Institute for Plasma Research
    In the present investigation, dissimilar materials such as AA6063 and SS304L having pipe dimensions of 60.33 mm outer diameter and 3.9 mm wall thickness were friction-welded with different conditions of process parameters. Nondestructive tests such as radiography test (RT) and liquid penetration test (LPT) were carried out on the welded pipes in order to qualify weld joint. Thermal shock test and helium leak tests were performed on the successful welded samples in order to check its ability to work with cryogenic application. The results revealed that the pipe-to-pipe configuration of dissimilar Al–SS joints was produced successfully by friction welding using continuous drive. There were no defects presented in the joint area as revealed by RT and LPT. Thermal shock test and helium leak tests have also confirmed the soundness of joints. Higher deformation of Al base material results in the huge flash formation of Al that results in the sleeve formation of Al pipe on SS pipe. The helium leak test has confirmed the soundness of joints without any defects after its testing at 1.2 psi pressure. More than 60% of joint efficiency was obtained from Al–SS friction-welded joints.
  • No Thumbnail Available
    Item
    Processing of Copper by Keyhole-Gas Tungsten Arc Welding for Uniformity of Weld Bead Geometry
    (TAYLOR & FRANCIS, 2020) Darji, Raghavendra; Badheka, Vishvesh; Mehta, Kush; Joshi, Jaydeep; Yadav, Ashish; Department of Mechanical Engineering; Advanced Manufacturing and Materials; Pandit Deendayal Petroleum University; Institute for Plasma Research
    Keyhole gas tungsten arc welding (K-GTAW) was applied to characterize the weld bead geometry in case of the 6 mm thick electrolytic tough pitch copper. Various conditions of welding speeds and preheating on the bead geometry were studied for its uniformity. Visual examination, macro bead dimensional analysis, microhardness profile across the transverse section, microstructural analyses were performed to investigate the K-GTAW on electrolytic tough pitch copper. The results revealed that full penetration of 6 mm can be obtained in a single pass using keyhole mode in GTAW. Keyhole length and width were majorly affected by the welding speed and preheating temperature. Significant variations in weld bead geometry were observed even when high heat input conditions were applied without preheating. Uniform weld bead geometry of 5 mm bead width and depth to width ratio of 0.42 was obtained for a length of 80 mm using appropriate preheating of 300°C and heat input condition of 1.37 kJ/mm (resulted from 300 amperes welding current, 120 mm/min welding speed, and 15.3 volts voltage). In the uniform weld bead geometry, the weld and heat affected zones were consisted of coarse grains relative to base material, wherein the micro hardness variations were observed.