Topic
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.
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TL;DR: In this paper, the results of research on welding of stainless steel with a defocused laser beam are presented and discussed and discussed in this paper, where the authors mainly paid to metallurgical processes of the weld pool formation, depending on the welding conditions and obtained results prove that the use of the defocused beam allows obtaining quality welded joints, and this technique has also positive influence on the stability of the keyhole, and on the phase composition of the welding metal.
37 citations
TL;DR: In this paper, a prediction model for the hot cracking rate was developed using a second order polynomial function considering only two factor interaction, and the model was then used to optimize welding parameters to achieve cracking-free welds.
Abstract: This paper investigates hot cracking rate in Al fiber laser welding under various process conditions and performs corresponding process optimization. First, effects of welding process parameters such as distance between welding center line and its closest trim edge, laser power and welding speed on hot cracking rate were investigated experimentally with response surface methodology (RSM). The hot cracking rate in the paper is defined as ratio of hot cracking length over the total weld seam length. Based on the experimental results following Box–Behnken design, a prediction model for the hot cracking rate was developed using a second order polynomial function considering only two factor interaction. The initial prediction result indicated that the established model could predict the hot cracking rate adequately within the range of welding parameters being used. The model was then used to optimize welding parameters to achieve cracking-free welds.
37 citations
DOI•
01 Jan 2008
TL;DR: The Magnetic Pulse Welding (MPW) process as mentioned in this paper is an industrial process, operating at several high volume manufacturing facilities, which is accomplished by the magnetically driven, high velocity, oblique angle, impact of two metal surfaces.
Abstract: The Magnetic Pulse Welding (MPW) process, a cold solid state welding process, is an industrial process, operating at several high volume manufacturing facilities. MPW is accomplished by the magnetically driven, high velocity, oblique angle, impact of two metal surfaces. At impact, the surfaces (which will always have some level of oxidation) are stripped off and ejected by the closing angle of impact. The surfaces which are then metallurgically pure, are pressed into intimate contact by the magnetic pressure, allowing valence electron sharing and atomic-level bonding. This process has been demonstrated in the joining of tubular configurations of a variety of metals and alloys [1],[2],[3]. Product designers are frequently constrained by the restrictions of traditional joining technologies, which place certain limitations on the type of joint, the materials that can be joined and the quality of the joint. Solid state welding allows manufacturers to significantly improve their product designs and production results by enabling both dissimilar and similar materials to be welded together, thus providing the opportunity to use lighter and stronger material combinations. Magnetic pulse welding is a fast, noncontact and clean solid state welding process. A review of the main elements of the process is presented here along with typical quality testing results and some applications.
37 citations
TL;DR: In this paper, a three-dimensional finite element (FE) thermal model is developed to simulate the laser transmission welding process for joining polyvinylidene fluoride to titanium using a distributed moving heat flux.
Abstract: Now-a-days, metal to plastic micro-welding is of great interest in the field of biomedical and electronics applications. Laser transmission welding (LTW) has emerged as the most suitable technique for such applications. In this paper, a three-dimensional finite element (FE) thermal model is developed to simulate the laser transmission welding process for joining polyvinylidene fluoride to titanium using a distributed moving heat flux. The objectives of this study are to predict the transient temperature field as well as the weld dimensions. All the major physical phenomena associated with the LTW process, such as, heat radiation, thermal conduction and convection heat losses are taken into account in the model development. The simulation algorithm is programmed as a macro routine within the ANSYS® finite element code. The developed model derives its main advantage from its applicability in parametric studies of a wide range of laser transmission metal to plastic welding problems of different geometrical, material and joint type, requiring only the basic thermo-physical material properties, the geometric details and the laser process parameters as input.
Keywords: Laser transmission welding, Temperature field, Weld dimension, Finite element analysis, Thermal modeling
37 citations
TL;DR: In this paper, sound generated during the gas metal arc welding (GMAW) process is used for assessing and monitoring of the welding process and for prediction of welding process stability and quality Theoretical and experimental analyses of the acoustic signals have shown that there are two main noise generating mechanisms; the first is arc extinction and arc ignition having impulse character, the second is the arc itself acting as an ionization sound source.
Abstract: The most frequently used arc welding process is gas metal arc welding (GMAW) Different methods are in use for monitoring the quality of a welding process In this paper sound generated during the GMAW process is used for assessing and monitoring of the welding process and for prediction of welding process stability and quality Theoretical and experimental analyses of the acoustic signals have shown that there are two main noise-generating mechanisms; the first is arc extinction and arc ignition having impulse character, the second is the arc itself acting as an ionization sound source A new algorithm based on the measured welding current was established for the calculation of emitted sound during the welding process The algorithm was verified for different welding condition, different welding materials and different specimen The comparisons have shown that the calculated values are in good agreement with the measured values of sound signal
37 citations