Experimental and Numerical Procedure for Studying Effect of Ultrasonic Spot Weld Parameters on Metal Joints for Electronic Components

The study in question consists to amplify the hydrodynamic and thermal instabilities by imposed pulsation during forced convection of air cooling of nine identical heated blocks simulate electronic components mounted on horizontal channel. The finite volume method has been used to solve the governing equations of unsteady forced convection. This approach uses control volume for velocities that are staggered with respect to those for temperature and pressure. The numerical procedure called SIMPLER is used to handle the pressure-velocity coupling. The results show that the time averaged Nusselt number for each heated block depends on the pulsation frequencies and is always larger than in the steady-state case. The new feature in this work is that we obtained a short band of frequencies which the enhancement of heat transfer of all electronic components is greater than 20 % compared with steady non pulsation flow. In addition, the gain in heat transfer Emax attainted the maximum value for the central blocks. Our numerical results were compared with other investigations and found to agree well with experimental data.

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Resistance Spot Welding Process Optimization Using Taguchi Robust Method for Joining Dissimilar Material

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.835.248 ◽

2016 ◽

Vol 835 ◽

pp. 248-253

Author(s):

Z.A.Z. Aizuddin ◽

B.A. Aminudin ◽

P.S. Sanda ◽

R.M.S. Zetty

Keyword(s):

Resistance Spot Welding ◽

Spot Welding ◽

Welding Process ◽

Dissimilar Materials ◽

Spot Weld ◽

Automotive Application ◽

Low Carbon ◽

Robust Method ◽

Resistance Spot ◽

Weld Parameters

Steel sheet joining were dominantly by resistance spot welding (RSW) method. It is the most implemented in automotive mass production in which the heat is applied to the materials. Joining different material with different properties is a challenge. Thicker material needs more current and time. Meanwhile, the thinner material may burn and weaken if the excessive parameters apply. The purpose of this study is to identify the optimum spot weld parameters for joining dissimilar materials with different thickness that involve high tensile strength steel and low carbon steel in the automotive application. In this study, weld parameters with varying electrode forces, welding currents, and welding times are analyzed by applying a Taguchi robust method for the design of experiment (DOE). The L9 orthogonal array has been chosen due to the particular material specimen and time constraint. In the analysis, the higher value of signal-to-noise (S/N) ratio indicates the good responses of testing parameter when the level changed. Base of the plotted S/N ratio graph for each factor, Taguchi robust method has suggested that A3 (5000V), B3 (25 cycle), and C2 (150N) as the optimum weld parameters. The confirmation test afterward, finally proved that the Taguchi robust method was a liable DOE method and has been successfully optimized the spot weld parameters.

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Experimental Study of Spot Weld Parameters in Resistance Spot Welding Process

Mechanics and Mechanical Engineering ◽

10.2478/mme-2018-0016 ◽

2020 ◽

Vol 22 (1) ◽

pp. 179-186 ◽

Cited By ~ 1

Author(s):

Lebbal Habib ◽

Reffas S. Ahmed ◽

Berrekia Habib ◽

Mario Guagliano

Keyword(s):

Resistance Spot Welding ◽

Spot Welding ◽

Welding Process ◽

Electrical Current ◽

Tensile Tests ◽

Spot Weld ◽

Resistance Spot ◽

Sequential Control ◽

Weld Time ◽

Weld Parameters

AbstractResistance spot welding is a comparatively clean and efficient welding process that is widely used in sheet metal joining. This process involves electrical, thermal and mechanical interactions. Resistance spot welding primarily takes place by localized melting at the interface of the sheets followed by its quick solidification under sequential control of water cooled electrode pressure and flow of required electric current for certain duration. In this experimental work the tensile tests and the spot weld diameter were studied. The objectives of this analysis is to understand the physics of the process and to show the influence of the electrical current, weld time and the type material in resistance spot welding process.

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