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Spot welding

About: Spot welding is a research topic. Over the lifetime, 12491 publications have been published within this topic receiving 89845 citations. The topic is also known as: Spot_welding.


Papers
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Journal ArticleDOI
TL;DR: In this paper, experiments were made for welding current variation between 6kA and 12kA, and the effect of welding current on micro-properties was very slight while nugget size was highly dependent on welding current.

59 citations

Journal ArticleDOI
TL;DR: In this paper, a low transformation temperature welding wire was applied to fabrication of fillet welded T joints, and the welding angular distortion and the temperature profile of the weld metal were continuously measured during the welding process.
Abstract: A newly developed low transformation temperature welding wire, of which the transformation start temperature is lower than that of conventional welding wires, was applied to fabrication of fillet welded T joints. The welding angular distortion and the temperature profile of the weld metal were continuously measured during the welding process. The angular distortion of the fabricated T joint was reduced when the weld metal reached the martensitic transformation start temperature. The residual angular distortion was less with the low transformation temperature welding wire than that with the conventional welding wires. The welding distortion of T joints was calculated by a numerical simulation with consideration of the effect of phase transformation under weld thermal cycles. The welding distortion was reproduced with high accuracy in the numerical simulation. Results of the numerical simulation also determined that there was a direct correspondence between the transformation expansion of the weld m...

59 citations

Journal ArticleDOI
TL;DR: In this paper, the authors describe a general methodology that is used in the commercial Finite Element code, DEFORM™ to model the resistance spot welding process incorporating all the basic mechanics of deformation, thermal, electrical and microstructure models.
Abstract: Weld quality in Resistance Spot Welding is directly influenced by competing process transients. These transients are caused by electrical, thermal, mechanical and metallurgical interactions. Controlling the process variables such as current, clamping force and welding time requires good understanding of how these interactions evolve during the welding process. In order to better understand the process and to control the final product quality in an efficient manner, a comprehensive process model that can account for these multi physics phenomena is required. This paper describes a general methodology that is used in the commercial Finite Element code, DEFORM™ to model the resistance spot welding process incorporating all the basic mechanics of deformation, thermal, electrical and microstructure models. Modeling process is illustrated using an example from the published literature. A detailed discussion of the process mechanics based on the observed transients during various stages of the spot welding process are presented. Model predictions on the thermal, mechanical and evolving microstructural phases during the welding process are also discussed.

59 citations

Patent
Hans P Kuchni1
17 Oct 1941
TL;DR: In this paper, an apparatus for testing by measurement of thermal conductivity of a spot weld is proposed. But this device is not suitable for determining whether a weld is good or bad by a measurement which depends upon the thermal conductivities of the weld.
Abstract: My invention relates to apparatus for testing by measurement of thermal conductivity. For example, my invention is useful for determining whether a spot weld is good or bad by a measurement which depends upon the thermal conductivity of the weld. The invention may be used to determine the thickness...

59 citations

Journal ArticleDOI
TL;DR: In this paper, the acoustic patterns of resistance spot welding in a servo-based electrode actuation system were analyzed using time and frequency domain representations, and the welding processes can be significantly put into classes for their behaviour (weld formation) based on acoustic emissions.
Abstract: Acoustic emission reveals certain characteristic in resistance spot welding process as it exists due to the variation of electromagnetic ties between atomic bounds. So, the objective of this study is to analyse the acoustic patterns of resistance spot welding in a servo-based electrode actuation system. Time and frequency domains’ representations are interchangeably applied to analyse such matters as those behaviours are captured via electronics means. More than one type of weldable materials (carbon steels and stainless steels) is purposely used to analyse the dissimilarity conditions as well as the individual material’s welding processes. The interpreted waveform shows that the welding processes can be significantly put into classes for their behaviour (weld formation) based on acoustic emissions. A best weld formation will have perfect acoustic pattern, while a better one will have more than one main lobe in frequency domain. Moreover, a dissimilar weld formation will have inter-transient spike waveform, while an expulsion welding process will have a rapid drop of signal in acoustic pattern. All these observations have been revealing dissimilar characteristic of welding processes to certain degrees when the fusion process is concerned in resistance spot welding.

59 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023208
2022415
2021355
2020620
2019739
2018744