Department of Mechanical engineering

Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1921

Browse

Filters

2018 - 201932020 - 20242

Settings

Has files: NoSubject: search.filters.subject.Aluminium

Search Results

Now showing 1 - 5 of 5
  • No Thumbnail Available
    Item
    A study on corrosion behavior of friction stir welded and tungsten inert gas welded AA2014 aluminium alloy
    (Elsevier, 2018-04) Sinhmar, Sunil
    The present study comprises the comparison of the electrochemical behavior of friction stir weld (FSW) joint and tungsten inert gas (TIG) weld joint of AA2014 using immersion test, potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS). Weld thermal cycles and microhardness were correlated with corrosion behavior of the weld joints. TIG weld joint showed lower corrosion resistance than FSW joint. Heat affected zone was the most corrosion susceptible region in both type of weld joints. Optical microscopy, FESEM, TEM and XRD analysis were performed to discuss the corrosion behavior in light of the microstructure.
  • No Thumbnail Available
    Item
    Effect of weld thermal cycle on metallurgical and corrosion behavior of friction stir weld joint of AA2014 aluminium alloy
    (Elsevier, 2019-01) Sinhmar, Sunil
    Friction stir welding of AA2014 aluminium alloy was performed at seven different speed combinations. Weld thermal cycles were measured at all the speed parameters and corresponding peak temperatures were observed at higher tool rotation speed and lower welding speed. Hardness and tensile tests were performed to study the mechanical properties of the weld joints. Corrosion behavior was studied using immersion, Tafel and electrochemical impedance spectroscopy tests. Optical microscopy, FESEM, XRD and transmission electron microscopy were used to investigate the metallurgical behavior of the weld joints. Microhardness and corrosion resistance were found higher at low rotation speed and high traverse speed. Corrosion behavior has been discussed in light of microstructure.
  • No Thumbnail Available
    Item
    Mechanical behavior of FSW joint welded by a novel designed stationary shoulder tool
    (Elsevier, 2020-03) Sinhmar, Sunil
    A novel stationary shoulder friction stir welding (SSFSW) tool was developed with provision for automatic removal of plasticized material entering into the shoulder during the welding. Main objective of this tool design was to obtain a symmetrical weld joint with narrow heat affected zone. Mechanical and metallurgical properties of AA2014 aluminium alloy SSFSW joint were compared with the conventional FSW joint. Sound weld joint with enhanced mechanical properties were obtained by the stationary shoulder tool. Optical microscopy, FESEM analysis along with EDS, transmission electron microscopy, XRD analysis, microhardness and toughness test were performed on both types of weld joint. Weld thermal cycle and heat generation were analyzed for stationary shoulder and conventional FSW tool and it was found that the SSFSW tool shoulder generates lesser heat than conventional FSW tool.
  • No Thumbnail Available
    Item
    Effect of variation in power input on dissimilar materials (Cu-Al) laser welding for battery manufacturing
    (Elsevier, 2024-06) Sinhmar, Sunil
    Battery manufacturing inherently requires the joining of dissimilar materials. The performance of a joint is significantly derived from the joining technique as well as the process parameters, which, in turn, determine the life of the product. The current study discusses the efficacy of laser welding to develop dissimilar joints of thin sheets of Al and Cu for battery applications at varying power inputs. Thin sheets of aluminium and copper were welded using laser power inputs of 2.0 kW, 2.1 kW, and 2.2 kW. A power input of 2.1 kW results in 86 % higher weld penetration than the 2.0 kW. High power input results in through-thickness penetration, which drastically affects the mechanical strength of the joint. A weld joint developed at 2.1 kW shows a higher shear load of 800 N among all the power input parameters. An intermetallic layer forms at the weld interface for all three power inputs. However, the width of the intermetallic layer increases with the laser power input.
  • No Thumbnail Available
    Item
    Mechanical and Corrosion Behavior of Pure Aluminium Added Friction Stir Weld Joint of Aluminium Alloy
    (Trans Tech Publications Ltd., 2019-09) Sinhmar, Sunil
    Friction stir welding (FSW) of AA2014 aluminium alloy was performed by sandwiching pure aluminium (Al) in the form of strip between the abutting surfaces. Mechanical and corrosion behavior of weld joint with and without pure aluminium addition was compared. Friction stir welding was carried out at rotational speed of 931 rpm and traverse speed of 41 mm/min. Pure aluminium strip of 1 mm thickness was used for incorporating Al in weld nugget zone. Microstructure analysis was carried out using optical microscope and FESEM with energy dispersive spectroscopy (EDS). Microhardness and tensile testing were performed on the weld joints. Corrosion behavior was investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (Tafel) test. FESEM analysis was performed before and after corrosion test. Traces of pure aluminium strip were observed in the microstructure. The incorporated strip was found not to be uniformly distributed in the nugget zone. Pure aluminium addition reduced the extent of formation of the second phase particle in the nugget zone as compared to the normal FSW joint i.e. without Al addition. This metallurgical homogeneity resulted in better corrosion resistance of the Al added weld joint than the normal FSW joint.