Electrical contact resistance effect on resistance spot welding

Wei, P. S.; Wu, Tung Hsin

doi:10.1016/j.ijheatmasstransfer.2012.01.040

Cited by 59 publications

(29 citation statements)

References 26 publications

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“…Interactions between these factors affecting the change of electrical resistance during spot welding are accounted. [23] Therefore, this is a highly non-linear problem involving the complex interaction between thermal, electrical, and mechanical phenomena. To simplify the problem, many researchers take the contact resistivity as a function of temperature.…”

Section: Thermo-electrical Boundary Conditionsmentioning

confidence: 99%

The Influence of Welding Parameters on the Nugget Formation of Resistance Spot Welding of Inconel 625 Sheets

Ashtiani

Zarandooz

2015

Metall Mater Trans A

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A 2D axisymmetric electro-thermo-mechanical finite element (FE) model is developed to investigate the effect of current intensity, welding time, and electrode tip diameter on temperature distributions and nugget size in resistance spot welding (RSW) process of Inconel 625 superalloy sheets using ABAQUS commercial software package. The coupled electro-thermal analysis and uncoupled thermal-mechanical analysis are used for modeling process. In order to improve accuracy of simulation, material properties including physical, thermal, and mechanical properties have been considered to be temperature dependent. The thickness and diameter of computed weld nuggets are compared with experimental results and good agreement is observed. So, FE model developed in this paper provides prediction of quality and shape of the weld nuggets and temperature distributions with variation of each process parameter, suitably. Utilizing this FE model assists in adjusting RSW parameters, so that expensive experimental process can be avoided. The results show that increasing welding time and current intensity lead to an increase in the nugget size and electrode indentation, whereas increasing electrode tip diameter decreases nugget size and electrode indentation.

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Section: Thermo-electrical Boundary Conditionsmentioning

confidence: 99%

The Influence of Welding Parameters on the Nugget Formation of Resistance Spot Welding of Inconel 625 Sheets

Ashtiani

Zarandooz

2015

Metall Mater Trans A

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“…The contact resistance stems from the presence of roughness on the contact surfaces or an additional layer between contact surfaces. Contact resistance can be increased by reducing electrode force which will reduce the contact area at the faying surfaces and increase the current density.This will produce higher heat generation and increases the rate of melting of material during spot welding for a given welding current and weld time [3].…”

Section: Review Of Related Literaturementioning

confidence: 99%

Welding Force Control of a Servo Gun

Joshi¹,

Lele²,

Dongre³

et al. 2014

International Journal of Advanced Research in Computer and Comm

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This paper shows the implementation of a system to control the force of a servo gun while welding using a Programmable Logic Controller [PLC], a servo motor and a servo drive. The system depends on the software provided by Rockwell i.e. Ultraware to control the servo motor through the servo drive. By controlling the welding force we can improve the quality of the weld and hence the efficiency will also increase.

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“…The dynamic resistance fluctuation was affected by the contact surface condition at sheet/sheet and electrode/sheet [20]. This contact surface condition was uncertainty in welding, which increased the difficulty of direct measurement to dynamic resistance in nugget development [21]. Cho et al [22] monitored the process variables in the primary circuit of the welding machine and the primary dynamic resistance was obtained.…”

Section: Introductionmentioning

confidence: 99%