scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal Article
TL;DR: In this paper, a simple model was suggested and used for calculating the electrical and thermal response of the resistance spot welding process to investigate the influence of contacting forces on the formation of weld nuggets.
Abstract: The effect of contact resistance including constriction and contamination resistance has been a major hurdle for the thermoelectrical analysis of the resistance spot welding process. In this paper, a simple model was suggested and used for calculating the electrical and thermal response of the resistance spot welding process to investigate the influence of contacting forces on the formation of weld nuggets. The electrode surface of the contact interface was assumed to be axisymmetric and its microasperities to have a trapezoidal cross-section. These microasperities were considered as the one-dimensional contact resistance elements in the finite element formulation. The contamination film was assumed to be a nonconducting oxide layer, which is very brittle, so that it is broken to some number of pieces when a contacting pressure is being applied. The crushed films were assumed to be distributed at regular intervals and to conserve their size and number during the welding process. The simulation results revealed that the proposed model can be successfully used to predict the effect of the contact resistance on the electrical and thermal response of the resistance spot welding process.

31 citations

Journal ArticleDOI
TL;DR: In this article, the influence of dwell time on the microstructure of the interface and lap shear strength of friction spot welded joints of AA5754 and Ti6Al4V alloys was analyzed.

31 citations

Patent
29 Sep 2000
TL;DR: In this article, a method for spot welding high-strength steel plates, from which a weld joint can be obtained that is superior in static strength and fatigue strength and has an excellent delayed fracture property, was provided.
Abstract: PROBLEM TO BE SOLVED: To provide a method for spot welding high-strength steel plates, from which a weld joint can be obtained that is superior in static strength and fatigue strength and has an excellent delayed fracture property, even when resistance spot welding high-strength steel plates of tensile strength equal to or greater than 750 MPa.SOLUTION: In resistance spot welding two high-strength steel plates 1 together, of which at least one steel plate has a tensile strength of 750 to 1850 MPa among high-strength steel plates consisting of two or more thin steel sheets, and which have a plate thickness of 0.8 to 3.6 mm respectively, and in which a carbon equivalent Ceq is 0.22 to 0.55 mass%, the following steps are executed after carrying out welding energization under pressure force EF1 represented by the following formula {1.96*t≤EF1≤3.43*t}: setting to a pressure force PEF1 represented by the following formula {1.2*EF1≤PEF1≤2.4*EF1}; carrying out post-energization by using a post-energization current PC1 represented by the following formula {0.60*WC≤PC1≤0.95*WC} and at a post-energization time Pt1 represented by the following formula {30≤Pt1≤200}; and then carrying out electrode holding at electrode holding time Ht represented by the following formula {0≤Ht≤200}.

30 citations

Journal ArticleDOI
TL;DR: In this paper, an adaptation of vaporizing foil actuator welding (VFAW), a solid-state impact welding technique for producing similar JSC590R and 6061-T6 spot-welded joints was used and the mechanical and fatigue properties of the joints were characterized using lap-shear testing, microhardness measurements, optical imaging and fatigue testing.

30 citations

Patent
19 Jan 1989
TL;DR: In this paper, a real-time adaptive control and method of controlling a spot welding process compensates for electrode wear, oxidized surfaces, fit up variations and machine variations using a least squares estimator to monitor the process and workpiece displacement.
Abstract: This real time adaptive control and method of controlling a spot welding process compensates for electrode wear, oxidized surfaces, fit up variations and machine variations. Workpiece thermal growth is the measurement discriminant and the welding machine heat command is the control input. The control utilizes a least squares estimator to monitor the process and workpiece displacement, a precompensator to shape a desired displacement trajectory command, and a model reference control with a Smith-predictor to compensate for time delays and a proportional-integral-derivative compensator. The model reference control has a mathematical model of the spot welding process and calculates an estimated displacement using a predicated process gain and bias calculated by the estimator. The estimated displacement is compared to the precompensator displacement trajectory and an error is generated which regulates the heat command through the PID compensator.

30 citations


Network Information
Related Topics (5)
Welding
206.5K papers, 1.1M citations
91% related
Alloy
171.8K papers, 1.7M citations
84% related
Microstructure
148.6K papers, 2.2M citations
83% related
Deformation (engineering)
41.5K papers, 899.7K citations
82% related
Machining
121.3K papers, 1M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023208
2022415
2021355
2020620
2019739
2018744