The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
M Shakil - One of the best experts on this subject based on the ideXlab platform.
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effect of ultrasonic Welding parameters on microstructure and mechanical properties of dissimilar joints
Materials & Design, 2014Co-Authors: M Shakil, N H Tariq, M Ahmad, M A Choudhary, J I Akhter, S S BabuAbstract:Abstract Ultrasonic spot Welding has received significant attention during past few years due to their suitable applications in comparison to conventional fusion Welding techniques. Fusion Welding of dissimilar Aluminum and Stainless steel alloys is always a challenging task because of poor control on grain size and formation of undesirable brittle intermetallic compounds in the Weld metal, which have deleterious effect on mechanical properties. In the past, Welding of dissimilar alloys has been performed using electron beam Welding, laser beam Welding and friction stir spot Welding, resistance spot Welding, etc. However, little work has been reported on dissimilar Welding of Aluminum and Stainless steel alloys using ultrasonic spot Welding. The objective of the present work is to optimize ultrasonic spot Welding parameters for joining 3003 Aluminum alloy with 304 Stainless steel. Welding was performed at various clamping pressures (i.e. 30, 40, 50 and 60 psi) and energy levels for investigating its effect on microstructure, mechanical properties and bond Quality of the Weld. Different levels of Weld Quality i.e. ‘under Weld’, ‘good Weld’ and ‘overWeld’ were identified at various Welding parameters using physical attributes. The Weld specimens prepared with energy 125 and 150 J showed the maximum bond strength and were rated as “good” Weld. It was also revealed that for a good Quality Weld, the maximum tensile strength is achieved once a reasonable amount of bond density and material thinning (required for the formation of metallurgical bonds) is attained.
Min Jou - One of the best experts on this subject based on the ideXlab platform.
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real time monitoring Weld Quality of resistance spot Welding for the fabrication of sheet metal assemblies
Journal of Materials Processing Technology, 2003Co-Authors: Min JouAbstract:Abstract Resistance spot Welding (RSW) is used for the fabrication of sheet metal assemblies. The process is used extensively for joining low carbon steel components for the bodies and chassis of automobiles, trucks, trailers, buses, mobile homes, motor homes and recreational vehicles, and railroad passenger cars, as well as cabinets, office furniture, appliances and many other products. High-strength low-alloy steel, stainless steel, nickel-, aluminum-, titanium and copper alloys are also spot Welded commercially. The major advantages of spot Welding are high speed and adaptability for automation in high-volume and/or high-rate production. Despite these advantages, RSW suffers from a major problem of inconsistent Quality from Weld to Weld. This problem results from both the complexity of the basic process as well as from numerous sources of variability, noise, and errors. Any or all of these complicate automation, reduce Weld Quality, demand over-Welding (i.e., the production of more Welds than are structurally needed, if each were perfect), and drive up production costs. For this reason, ensuring Weld Quality has been and remains a major challenge and goal. The objective of this research is to explore the phenomenon of how changes in a controllable parameter of (i.e., percentage heat input) affect a measurable output signal indicative of strength and Weld Quality (i.e., electrode displacement) for various sheet steels used in the automotive industry. The approach of this research is to create a relationship between a key process input variable and the key process output of a Quality Weld. The input parameter chosen is the percentage heat input, as this directly affects the size and strength of the resulting Weld. The output chosen is electrode displacement, as this has been shown to accurately reflect the formation and growth of a Weld nugget. A series of experiments will be conducted to explore how changes of the percentage heat input affect the electrode displacement curve for various sheet steels used in the automotive industry.
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experimental investigation of resistance spot Welding for sheet metals used in automotive industry
Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing, 2001Co-Authors: Min JouAbstract:Resistance spot Welding (RSW) is used for the fabrication of sheet metal assemblies. The major advantages of spot Welding are high speed and adaptability for automation in high-volume and/or high-rate production. Despite these advantages, resistance spot Welding suffers from a major problem of inconsistent Quality from Weld to Weld. This problem results from both the complexity of the basic process as well as from numerous sources of variability, noise, and errors. Any or all of these complicate automation, reduce Weld Quality, demand over Welding and drive up production costs. For this reason, ensuring Weld Quality has been and remains a major challenge and goal. The objective of this research is to explore the phenomenon of how changes in a controllable parameter of % heat input affect a measurable output signal indicative of strength and Weld Quality for various sheet steels used in the automotive industry. The approach of this research is to create a relationship between a key process input variable and the key process output of a Quality Weld. The input parameter chosen is % heat input, as this directly effects the size and strength of the resulting Weld. The output chosen is electrode displacement, as this has been shown to accurately reflect the formation and growth of a Weld nugget. A series of experiments was conducted to explore how changes of % heat input and process variations affect the electrode displacement curve for various sheet steels used in the automotive industry. Experimental results show that the electrode displacement increased when higher % heat input was applied. Weld nugget starts to grow when electrode velocity cube changes from positive to negative. Characteristic electrode displacement curves were developed for process variations. A poor part fit-up condition shifted the electrode displacement curve to the right as a result of a smaller Weld nugget being formed. Worn electrode lowers the electrode displacement curve. For bare steel, electrode displacement is higher than electrogalvanized and hot-dip galvanized steel. The higher strength steels have higher electrode displacements than for plain carbon steel.
Abdelaziz Bazoune - One of the best experts on this subject based on the ideXlab platform.
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coupled eulerian lagrangian finite element modeling of friction stir Welding processes
Journal of Materials Processing Technology, 2013Co-Authors: Fadi Albadour, Nesar Merah, A N Shuaib, Abdelaziz BazouneAbstract:Abstract A 3-dimensional localized finite element model (FEM) is developed to predict likely conditions that result in defect generation during friction stir Welding (FSW). The workpiece is modeled using Eulerian formulation, while the tool is modeled using Lagrangian. Coulomb's frictional contact model is adopted to define the tool workpiece interaction, while the Welding speed is defined by material inflow and outflow velocities. The numerical results show that the coefficient of friction has a major effect on void formation; the lower the friction coefficient is applied, the larger the void is formed. Furthermore, Welding using force control (FC) at lower Welding speed results in smaller void size and wider plastic zone, leading to higher Quality Weld.
S S Babu - One of the best experts on this subject based on the ideXlab platform.
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effect of ultrasonic Welding parameters on microstructure and mechanical properties of dissimilar joints
Materials & Design, 2014Co-Authors: M Shakil, N H Tariq, M Ahmad, M A Choudhary, J I Akhter, S S BabuAbstract:Abstract Ultrasonic spot Welding has received significant attention during past few years due to their suitable applications in comparison to conventional fusion Welding techniques. Fusion Welding of dissimilar Aluminum and Stainless steel alloys is always a challenging task because of poor control on grain size and formation of undesirable brittle intermetallic compounds in the Weld metal, which have deleterious effect on mechanical properties. In the past, Welding of dissimilar alloys has been performed using electron beam Welding, laser beam Welding and friction stir spot Welding, resistance spot Welding, etc. However, little work has been reported on dissimilar Welding of Aluminum and Stainless steel alloys using ultrasonic spot Welding. The objective of the present work is to optimize ultrasonic spot Welding parameters for joining 3003 Aluminum alloy with 304 Stainless steel. Welding was performed at various clamping pressures (i.e. 30, 40, 50 and 60 psi) and energy levels for investigating its effect on microstructure, mechanical properties and bond Quality of the Weld. Different levels of Weld Quality i.e. ‘under Weld’, ‘good Weld’ and ‘overWeld’ were identified at various Welding parameters using physical attributes. The Weld specimens prepared with energy 125 and 150 J showed the maximum bond strength and were rated as “good” Weld. It was also revealed that for a good Quality Weld, the maximum tensile strength is achieved once a reasonable amount of bond density and material thinning (required for the formation of metallurgical bonds) is attained.
R D K Misra - One of the best experts on this subject based on the ideXlab platform.
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microstructure mechanical and corrosion properties of friction stir Welded high nitrogen nickel free austenitic stainless steel
Materials & Design, 2015Co-Authors: Zhouhua Jiang, Hao Feng, Shucai Zhang, R D K MisraAbstract:Abstract Friction stir Welding (FSW) was applied to a 2.4 mm thick high nitrogen nickel-free austenitic stainless steel plate using tungsten–rhenium (W–Re) tool. The high-Quality Weld was successfully produced at a tool rotational speed of 400 rpm and a traveling speed of 100 mm/min. The microstructure, mechanical and corrosion properties of the Weld were studied. The nitrogen content of the Weld was almost identical to that of base metal (BM). FSW refined grains in the stir zone (SZ) through dynamic recrystallization and led to increase in hardness and tensile strength within the SZ, while the ductility was slightly decreased. The failure of tensile specimens occurred in the BM. TEM results revealed precipitates of Cr 23 C 6 of size ~ 1 μm in the SZ, although their content was small. The precipitation of Cr 23 C 6 and increase in δ-ferrite in the SZ led to small decrease in both pitting and intergranular corrosion resistance.
