Electric resistance welding

About: Electric resistance welding is a research topic. Over the lifetime, 16761 publications have been published within this topic receiving 154851 citations.

Identification of optimum friction stir spot welding process parameters controlling the properties of low carbon automotive steel joints

Abstract: Friction stir spot welding is a novel solid state process that has recently received considerable attention from various industries including automotive sectors due to many advantages over the resistance spot welding. However to apply this technique, the process parameters must be optimized to obtain improved mechanical properties compared to resistance spot welding. To achieve this, in this investigation, design of experiments was used to conduct the experiments for exploring the interdependence of the process parameters. A second order quadratic model for predicting the lap shear tensile strength of friction stir spot welded low carbon automotive steel joints was developed from the experimental obtained data. It is found that dwell time plays a major role in deciding the joint properties, which is followed by rotational speed and plunge depth. Further optimum process parameters were identified for maximum lap shear tensile strength using numerical and graphical optimization techniques.

Numerical and experimental investigation of laser beam welding of aisi 304 stainless steel sheet

Abstract: Laser welding offers the advantage of very low heat input to the weld, resulting in low distortion and the ability to weld heat sensitive components. To obtain good weld bead geometry the selection of input parameters is very important. Laser beam welding trials are carried-out for 1.6 mm thick austenitic stainless steel for different beam power, welding speed and beam angle. The experimental trials for butt-joint configuration are conducted based on three level Box-Behnken design with replication resulting in 15 trials. The transient temperature profiles and weld pool dimensions, depth of penetration (DP) and bead width (BW) of the weld have been calculated using finite element code SYSWELD. A three dimensional Conical Gaussian heat source and the temperature dependent thermo-physical properties of AISI 304 stainless steel sheet are employed for performing a non-linear transient thermal analysis. It is found that the optimized parameters for deep penetration welding are laser power of 1250 Watts, welding speed of 750 mm/min and beam angle of 90o. Finally, the results of the simulation models and the experimental results are compared.

Resistance welding manual

Abstract: 2 Ruukki is a metal expert you can rely on all the way, whenever you need metal-based materials, components, systems and total solutions. We constantly develop our product range and operating models to match your needs. Foreword Resistance welding manual was compiled in order to provide assistance to Ruukki's customers and partners (like research institutes and education departments) who are resistance welding in their production process or planning to invest in resistance welding. The manual includes background and advice in choosing welding parameters and recommended welding parameters for both cold-rolled un-coated sheets and metal coated sheets of Ruukki.

Investigation of the effect of welding parameters on weld quality of plasma arc keyhole welding of structural steels

Abstract: In the present investigation, the individual and interactive effects of the main welding parameters on weld quality of plasma arc keyhole welding of conventional structural steel, high strength microalloyed steel and strong formable microalloyed steel have been examined using welding of butt joints with a square groove in various welding positions, and welding of joint roots with a single-V-groove and the root face in the flat position. The most important welding parameters are welding current, welding speed and welding gases, especially plasma gas flow rate. Welding parameter combinations producing the best quality welds are presented. It is shown that it is possible to achieve defect-free high-quality welds with good strength and toughness properties, but the allowable range of variation of welding parameters, especially for the highest weld quality, is narrow. An argonhydrogen mixture for the plasma gas together with argon as shielding and backing gases give the best results with respect to weld quality.

Microstructures and properties of Mg alloy/DP600 steel dissimilar refill friction stir spot welds

Abstract: Joining of ZEK100 Mg alloy and Zn coated DP600 steel sheets is studied using refill friction stir spot welding (RFSSW) The RFSSW process involves a tool with independently moving sleeve and pin components, which rotate at a constant speed and penetrate into only the top sheet Welds could be achieved, which exceeded 47 kN shear strength, using the following process parameters: 1800 rev min− 1 tool speed, 30 s welding time and 15 mm of penetration into the upper ZEK100 sheet Scanning electron (SEM) and transmission electron microscopy (TEM) are used to characterise the Mg/steel interface It is revealed that a continuous layer of FeAl2 particles accommodate bonding of the sheets, which appears to have originated from the galvanised coating on the DP600