scholarly journals Resistance Spot Welding Characteristic of 1500MPa Steel Sheet Using Simulation (II) - Estimation Model for Nugget Diameter of Resistance Spot Welds -

2018 ◽  
Vol 36 (3) ◽  
pp. 51-56 ◽  
Author(s):  
Jong-Jung Lee ◽  
Chang-soek Son ◽  
Young Whan Park
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Steel Sheet ◽  
Spot Welds ◽  
Estimation Model ◽  
Resistance Spot ◽  
Nugget Diameter ◽  
Resistance Spot Welds

Resistance Spot Welding of Low Carbon Steel to Austenitic CrNi Stainless Steel

2014 ◽  
Vol 875-877 ◽  
pp. 1499-1502 ◽  
Author(s):  
Ladislav Kolařík ◽  
Miroslav Sahul ◽  
Marie Kolaříková ◽  
Martin Sahul ◽  
Milan Turňa
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Weld Joint ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds

The contribution deals with resistance spot welding of low carbon steel to austenitic CrNi stainless steel. The thickness of welded dissimilar steels was 2 mm. DeltaSpot welding gun with process tape was utilized for welding of the above-mentioned combination of steels. Resistance spot welds were produced under different welding currents. The welding currents used were 7 kA, 7.5 kA and 8 kA, respectively. Optical microscopy, microhardness measurement across the weld joint and EDX analysis across the weld joint interface were used to evaluate the quality of resistance spot welds of dissimilar steels.

scholarly journals Fast Prediction for Resistance Spot Welding Deformation Using Inherent Strain Method and Nugget Model

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7180
Author(s):  
Takeshi Chino ◽  
Atsushi Kunugi ◽  
Toshikazu Kawashima ◽  
Goro Watanabe ◽  
Cao Can ◽  
...  
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Deformation ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds ◽  
Fast Prediction ◽  
Inherent Strain ◽  
Inherent Strain Method ◽  
Strain Method

In a car body, there exist thousands of resistance spot welds, which may induce large deformation during the manufacturing process. Therefore, it is expected that automotive industries will develop a method and a computing system for the fast and simple prediction of its deformation. Although the inherent strain method has been used for the fast prediction of arc welding deformation, it has not been applied to resistance spot welding so far. Additionally, the electrical-thermal-mechanical coupling analysis for the deformation induced by resistance spot welding is complicated and much more time-consuming. Therefore, in this study, a nugget model of the resistance spot weld has been developed, and the inherent strain method is extended for use in the fast prediction of resistance spot welding deformation. In addition, the deformation of a vehicle part with 23 resistance spot welds was efficiently predicted within around 90 min using the inherent strain method, displaying good accuracy compared with the measurement.

Resistance Spot Welding Process of Galvanized Steel Sheet Based on Regression Modeling

2009 ◽  
Vol 610-613 ◽  
pp. 681-686
Author(s):  
Yi Luo ◽  
Hong Ye ◽  
Cheng Zhi Xiong ◽  
Lin Liu ◽  
Xu Wei Lv
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Steel Sheet ◽  
Welding Process ◽  
Welding Current ◽  
The Body ◽  
Galvanized Steel ◽  
Spot Welds ◽  
Current Electrode ◽  
Resistance Spot

The resistance spot welding process of galvanized steel sheet used in the body manufacturing of family car was studied, and the indexes of nugget geometry and tensile-shear strength of spot welds were tested. Four process parameters, namely welding current, electrode force, welding current duration and preheat current, and interactions among them were regarded as factors impacting indexes. Method using in mathematical models developing was nonlinear multiple orthogonal regression assembling design, which was optimized by the technology of variance analysis. The experimental results showed that more accurate prediction on nugget size and mechanical properties of spot welds can be obtained by the models optimized. With these prediction results, the optimization of welding process also was realized by the analysis to effect of the parameters and interactions on the welding quality.

Dynamic Electrode Force and Displacement in Resistance Spot Welding of Aluminum

2004 ◽  
Vol 126 (3) ◽  
pp. 605-610 ◽  
Author(s):  
C. T. Ji, ◽  
Y. Zhou,
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Current ◽  
Monitoring And Control ◽  
Resistance Spot ◽  
Nugget Diameter ◽  
Electrode Force ◽  
Rate Of Increase ◽  
Process Monitoring And Control ◽  
Electrode Displacement

Dynamic electrode displacement and force were characterized during resistance spot welding of aluminum alloy 5182 sheets using a medium-frequency direct-current welder. It was found that both electrode displacement and force increased rapidly at the beginning of the welding stage and then at a reducing rate. Rates of increase in electrode displacement and force were both proportional to welding current. And both electrode displacement and force experienced a sudden drop when weld metal expulsion occurred. However, the rate of increase in electrode displacement did not reach zero during welding even for joints with sufficient nugget diameter, while electrode force peaked when a large nugget diameter was produced. Possible strategies for process monitoring and control were also discussed.

Dissimilar resistance spot welding of AISI 304 to AISI 409 stainless steels: mechanical properties and microstructural evolutions

2018 ◽  
Vol 115 (6) ◽  
pp. 610 ◽  
Author(s):  
Mehdi Safari ◽  
Hossein Mostaan ◽  
Abdoreza Ghaderi
Keyword(s):  
Stainless Steels ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Steel Sheet ◽  
Welding Current ◽  
Stainless Steel Sheet ◽  
Tensile Shear ◽  
Aisi 304 ◽  
Resistance Spot ◽  
Electrode Force

In this work, dissimilar resistance spot welding of austenitic stainless steel sheet (304 grade) and ferritic stainless steel sheet (409 grade) is studied experimentally. For this purpose, the effects of process parameters such as welding current, welding time and electrode force on tensile-shear strength of resistance spot welded joints are investigated with response surface methodology (RSM). Also, microstructural evolutions during resistance spot welding process of AISI 409 and AISI 304 stainless steels are evaluated by optical microscopy. It is concluded from results that the tensile-shear strength of spot welds is increased with increasing the welding current, welding time and electrode force. It is shown that widmanstatten ferrites have been grown in the weld metal of dissimilar resistance spot welds of AISI 304 and AISI 409 stainless steels.

scholarly journals Experimental and numerical analysis of shunting effect in resistance spot welding of Al2219 sheets

2016 ◽  
Vol 64 (2) ◽  
pp. 425-434 ◽  
Author(s):  
M. Jafari Vardanjani ◽  
A. Araee ◽  
J. Senkara ◽  
J. Jakubowski ◽  
J. Godek
Keyword(s):  
Finite Element ◽  
Heat Affected Zone ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Numerical Solutions ◽  
Potential Temperature ◽  
Model Verification ◽  
Spot Welds ◽  
Resistance Spot ◽  
Shunting Effect

Abstract Few aspects of shunting effect have been studied so far. Shunting effect in resistance spot welding (RSW) occurs when the electrical current passes through the previous spot welds. Value of this current depends mostly on distance, number, and size of previous spot welds. This will cause some dimensional and metallurgical changes in welding nugget as well as heat affected zone (HAZ). In this study, shunting effect of RSW is considered by finite element method (FEM) and the results are compared to experiments performed on aluminum alloy 2219. Weld spacing together with welding current and time are considered to discover the effect of shunting current in the final quality of nugget. A three factor experiment design has been performed to find the significance of factors and interactive effects, as well as finite element model verification. Electrothermal and mechanical interactions are considered in the FEM. Experimental and numerical solutions have yielded similar results in terms of welding nugget properties. Asymmetry in electrical potential, temperature, stress distribution and geometry of shunted nugget is predicted and verified directly or indirectly. Intense effect of shunting current on nugget height, asymmetric growth of heat affected zone (HAZ) toward previous welding nugget, as well as concentration of alloying elements along grain boundaries are also discovered.

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