Topic
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.
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TL;DR: In this article, a keyhole refilled Friction Stir Spot Welding (FSSW) process is developed for joining aluminum alloy 6061 to Transformation Induced Plasticity (TRIP) steel.
40 citations
TL;DR: In this paper, the relationship between weld quality and various process conditions, including abnormal process conditions has not yet been systematically studied, and a newly developed two-stage, sliding-level experiment was conducted to investigate the relationship using a newly-developed two-dimensional model.
Abstract: Quality variation in resistance spot welding is a major concern in the automotive industry. The relationship between weld quality and various process conditions, including abnormal process conditions, has not yet been systematically studied. This paper investigates this relationship using a newly developed two-stage, sliding-level experiment. In the experiment, welding current is treated as a slid factor whose settings are determined based on those of other process variables. Engineering knowledge is applied in statistical model selection. From the analysis, it is found that abnormal process conditions, such as axial misalignment, angular misalignment, poor fitup, edge weld, and electrode wear, significantly affect weld size and thus cause large variation in the weld quality. Although they may help increase the weld size in some cases, abnormal process conditions generally lead to a less robust process. In order to minimize the effects of the abnormal process conditions, a robust parameter design is formulated using the statistical models developed from the experimental data. The analysis suggests that high current and large electrodes should be used for reducing the weld quality variation. Developed in this study, the new experimental design and analysis procedures can also be applied to other processes, where the process variables are inter-dependent.
40 citations
TL;DR: Based on the existing You Only Look Once (YOLOv3) model, the proposed model has three novel improvements. as mentioned in this paper introduced the lightweight network MobileNetV3 to replace the backbone network of YOLO-v3 to ensure accuracy and real-time performance.
40 citations
Patent•
23 Nov 1981
TL;DR: The quality of an electrical resistance spot weld is determined by monitoring the squeezing force applied through the electrodes to the workpieces by a force-transmitting device that exerts a squeezing force that varies when indentation of the workpiece occurs as mentioned in this paper.
Abstract: The quality of an electrical resistance spot weld is determined by monitoring the squeezing force applied through the electrodes to the workpieces by a force-transmitting device that exerts a squeezing force that varies when indentation of the workpieces occurs
40 citations
Patent•
19 Jul 1978
TL;DR: In this paper, a flexible optical fiber bundle has one end located in the welding tip and the other end optically coupled to an infrared detector, which produces an output signal proportional to the weld temperature.
Abstract: Control of spot weld quality is effected by observing the progress of heat generation within the weld and initiating automatic corrective action if the heating rate is initially too high or too low. A flexible optical fiber bundle has one end located in the welding tip and the other end optically coupled to an infrared detector. Due to the excellent thermal conductivity of the copper material of the welding tip, thermal energy is conducted very rapidly for a short distance into the tip during the weld formation so that the infrared detector produces an output signal proportional to the weld temperature. This signal is sampled and compared with a previously-recorded signal corresponding to the heating rate that produced a good spot weld in the material being welded.
40 citations