scholarly journals Machine Learning Modeling and Hyper-Parameter Optimization for Weld Nugget Formation and Failure Behavior of Resistance Spot Welds

2021 ◽  
Author(s):  
Hyeonjeong You ◽  
Cheolhee Kim
Keyword(s):  
Machine Learning ◽  
Parameter Optimization ◽  
Weld Nugget ◽  
Failure Behavior ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds ◽  
Nugget Formation

Three-Sheet Spot Welds of 5052 Aluminum Alloy: Weld Growth and Failure Behavior

2015 ◽  
Vol 782 ◽  
pp. 158-163 ◽  
Author(s):  
Fu Yu Yan ◽  
Zhen Luo ◽  
Yuh J. Chao ◽  
San San Ao ◽  
Yang Li ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Failure Modes ◽  
Peltier Effect ◽  
Failure Behavior ◽  
Spot Welds ◽  
Resistance Spot ◽  
Pull Out ◽  
Resistance Spot Welds ◽  
Nugget Formation ◽  
Alloy Weld

Resistance spot welding is used extensively in auto industry. Every commercial vehicle has 4000-5000 spot welds. The weld ability, performance, and reliability are therefore important issues in design. In this paper, we studied weld nugget formation and failure behavior of three-sheet 5052 aluminum alloy resistance spot welds. The Peltier effect between the Cu-Al (the electrode and the Al worksheet) to the nugget formation was noticed. The mechanical strength and fracture mode of the weld nuggets at the upper and lower interfaces were studied using tensile shear specimen configuration. Three failure modes were identified, namely, interfacial, mixed, and pull-out. The critical welding time and critical nugget diameter corresponding to the transitions of these modes were investigated. Finally, an empirical failure load formula for three-sheet weld similar to two-sheet spot weld was developed.

scholarly journals Effect of weld nugget size on failure mode and mechanical properties of microscale resistance spot welds on Ti–1Al–1Mn ultrathin foils

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878528 ◽  
Author(s):  
Feng Chen ◽  
Shiding Sun ◽  
Zhenwu Ma ◽  
GQ Tong ◽  
Xiang Huang
Keyword(s):  
Mechanical Properties ◽  
Failure Mode ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Weld Nugget ◽  
Interfacial Failure ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds ◽  
Pullout Failure

We use tensile–shear tests to investigate the failure modes of Ti–1Al–1Mn microscale resistance spot welds and to determine how the failure mode affects the microstructure, microhardness profile, and mechanical performance. Two different failure modes were revealed: interfacial failure mode and pullout failure mode. The welds that fail by pullout failure mode have much better mechanical properties than those that fail by interfacial failure mode. The results show that weld nugget size is also a principal factor that determines the failure mode of microscale resistance spot welds. A minimum weld nugget size exists above which all specimens fail by pullout failure mode. However, the critical weld nugget sizes calculated using the existing recommendations are not consistent with the present experimental results. We propose instead a modified model based on distortion energy theory to ensure pullout failure. Calculating the critical weld nugget size using this model provides results that are consistent with the experimental data to high accuracy.

Effect of weld nugget size on overload failure mode of resistance spot welds

2007 ◽  
Vol 12 (3) ◽  
pp. 217-225 ◽  
Author(s):  
M. Pouranvari ◽  
H. R. Asgari ◽  
S. M. Mosavizadch ◽  
P. H. Marashi ◽  
M. Goodarzi
Keyword(s):  
Failure Mode ◽  
Weld Nugget ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds

An Analysis of the Transient Nugget Formation in Resistance Spot Welds

1986 ◽  
Vol 200 (3) ◽  
pp. 167-172 ◽  
Author(s):  
Y J Cho ◽  
K S Boo ◽  
H S Cho ◽  
S J Na ◽  
C W Lee
Keyword(s):  
Control Algorithm ◽  
Current Flow ◽  
Growth Equation ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds ◽  
Proposed Model ◽  
Nugget Growth ◽  
On Line ◽  
Nugget Formation

An analytical model is presented to describe the transient nugget growth in resistance spot welds. Since an exact analysis of this model is difficult, due to complexities arising from the interaction of heat and electric current flow, and from the melting of the weldment, an approximate solution is proposed by employing the integral method and some previous results obtained by the authors (13). With the aid of this analysis a simplified nugget growth equation is derived, which can be effectively used for the design of an adequate on-line feedback control algorithm. To verify the validity of this model equation, the computed results are compared with those experimentally obtained for the case of welding of mild steels. The comparison shows that the transient nugget behaviour is well predictable by the proposed model for the welding conditions in this simulation study.

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