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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.


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Journal Article
TL;DR: In this paper, the authors presented a universal quality assurance method based on dynamic resistance that is valid over a wide range of welding time, welding current, electrode force and electrode tip geometry (up to and including complete tip mushrooming).
Abstract: Welding of mild steel is one of the most common processes in spot welding. Numerous methods for ensuring high-quality welds are based on dynamic resistance. However, in general, these methods are only useful over a relatively narrow range of welding parameters. This article presents a universal quality assurance method based on dynamic resistance that is valid over a wide range of welding time, welding current, electrode force and electrode tip geometry (up to and including complete tip mushrooming). This method was constructed on the basis of models describing current density redistribution at the faying surface during the welding process. Validation of the method has been confirmed experimentally. The comparison of results shows that the method provides the maximum nugget size.

35 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of Nd:YAG laser welding parameters, including laser pulse time and power intensity, and material-dependent variables, such as absorptivity and thermophysical properties, on laser spot-weld characteristics have been studied experimentally.
Abstract: The weldabilities of AA 1100 aluminum and AISI 409 stainless steel by the pulsed Nd:YAG laser welding process have been examined experimentally and compared. The effects of Nd:YAG laser welding parameters, including laser pulse time and power intensity, and material-dependent variables, such as absorptivity and thermophysical properties, on laser spot-weld characteristics, such as weld diameter, penetration, melt area, melting ratio, porosity, and sur-face cratering, have been studied experimentally. The results of this work are reported in two parts. In Part I, the weldability of AISI 409 stainless steel by the pulse laser welding process is reported. In Part II, the weldability of A A 1100 aluminum under the same operating con-ditions is reported and compared to those of the stainless steel. When welding AISI 409 stainless steel, weld pool shapes were found to be influenced most by the power intensity of the laser beam and to a lesser extent by the pulse duration. Conduction mode welding, keyhole mode welding, and drilling were observed. Conduction mode welds were produced when power in-tensities between 0.7 and 4 GW/m2 were used. The initial transient in weld pool development occurred in the first 4 ms of the laser pulse. Following this, steady-state conditions existed and conduction mode welds with aspect ratios (depth/width) of about 0.4 were produced. Keyhole mode welds were observed at power intensities greater than 4 GW/m2. Penetration of these keyhole mode welds increased with increases in both power intensity and pulse time. The major weld defects observed in the stainless steel spot welds were cratering and large-occluded gas pores. Significant metal loss due to spatter was measured during the initial 2 ms of keyhole mode welds. With increasing power intensity, there was an increased propensity for occluded gas pores near the bottom of the keyhole mode welds.

35 citations

Journal ArticleDOI
TL;DR: In this paper, a finite element analysis for single spot tensile shear spot welds with software ANSYS was carried out, where cyclic material constants of different zones in the periphery of spot weld were determined in accordance with hardness distribution, as well as base material fatigue parameters.

35 citations

Patent
18 Nov 2015
TL;DR: In this paper, a welding device for a side sealing plate barb of a switch cabinet is described, which consists of an electric welding machine, a spot welding gun, supporting pillars, a lower base, an electric conduction block, a suspending plate and an upper seat.
Abstract: The invention relates to the technical field of manufacturing of low-voltage drawer-type switch cabinets and discloses a welding device for a side sealing plate barb of a switch cabinet. The welding device comprises an electric welding machine, a spot welding gun, supporting pillars, a lower base, an electric conduction block, a suspending plate and an upper seat. The electric welding machine is provided with two electrodes, and the spot welding gun is connected with one of the electrodes. Clamps are arranged on the lower seat, and the suspending plate is connected with the upper seat through an air cylinder. The electric conduction block is connected to the suspending plate. The electric conduction block is electrically connected with the other electrode. The spot welding gun is connected to the suspending plate and is provided with a barb fixing structure. The supporting pillars comprise damper springs, upper sections and lower sections, wherein the upper sections and the lower sections are sleeved together. The upper ends of the upper sections are provided with connecting rings, inner rings are arranged in the connecting rings in a penetrating mode, the inner rings and the connecting rings are connected together through rubber rings, and connecting pins connected to the lower seat are arranged in the inner rings in a penetrating mode. The welding device has the advantages that a welded part does not need to be fixed manually, and the vibration isolation effect is good; the problems that much effort is cost in welding and the welding quality is poor due to welding by manually fixing the welded part are solved.

35 citations

Journal Article
TL;DR: In this article, a systematic approach to determine effect of process parameters (pressure, weld time and current) on tensile shear strength of resistance weld joint of austenitic stainless steel AISI 304 using Taguchi method was presented.
Abstract: This study presents a systematic approach to determine effect of process parameters (pressure, weld time and current) on tensile shear strength of resistance weld joint of austenitic stainless steel AISI 304 using Taguchi method Optimum welding parameters determined by Taguchi method improved welding strength

35 citations


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