Assessment of Fatigue Life by FEMFAT on the Weld Configuration of Spot Welding

2008 ◽  
Vol 580-582 ◽  
pp. 625-628
Author(s):  
Bok Kyu Lim ◽  
Min Gun Kim ◽  
Ku Hyun Chung ◽  
Dong Youl Kim ◽  
Young Woo Choi
Keyword(s):  
Welded Joints ◽  
Spot Welding ◽  
Fatigue Behavior ◽  
Tensile Load ◽  
Design Criterion ◽  
Element Analysis ◽  
Single Spot ◽  
Welding Joints ◽  
The Stability ◽  
Spot Welded

The stability of plate structure is a very critical problem. The spot welding is practically designed by experiential decisions; so, it is inefficient and risks fatigue fracture. In real structure, multi-spot welded joints are more frequently used than single-spot welded joint. The fatigue behavior of multi-spot welded joints is different from that of single-spot welded joints. The fatigue lives of spot-welding specimen and multi points spot-welding structure are predicted using a FEMFAT 4.4e based on the linear finite element analysis. It is necessary to establish a reasonable and systematic design criterion for the long life design of the spot-welding body structure. In this study, relative location of spot welding was chosen as parameter and the stress distribution around the spot-welding joints’ subjected tensile load was numerically analyzed.

Effect of Forging Force on Fatigue Behavior of Spot Welded Joints of Aluminum Alloy 5182

2006 ◽  
Vol 129 (1) ◽  
pp. 95-100 ◽  
Author(s):  
B. H. Chang ◽  
D. Du ◽  
B. Sui ◽  
Y. Zhou ◽  
Z. Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Fatigue Behavior ◽  
Fatigue Cracks ◽  
Element Analysis ◽  
Aluminum Alloy 5182 ◽  
Forging Force ◽  
Positive Effect ◽  
Spot Welded

Using experimental and finite element analysis methods, the effects of electrode forging force are investigated on fatigue behavior and residual stress of spot welded joints of aluminum alloy 5182. Results show that applying forging force significantly reduces the residual stresses in the heat affected zone and the fatigue cracks no longer initiate from there; instead, all cracks begin from the nugget edge. In addition, the mitigation of residual stress by forging force decreases the driving force for crack propagation and leads to longer fatigue life. It can be concluded that applying forging force appropriately has a positive effect on the fatigue strength of resistance spot welded joints.

scholarly journals Finite element analysis of residual stress generation during spot welding and its affect on fatigue behavior of spot welded joints

2005 ◽  
Author(s):  
◽  
Xin Long
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Spot Welding ◽  
Welded Joint ◽  
Fatigue Behavior ◽  
Welding Process ◽  
Stress Generation ◽  
Fracture Mechanisms ◽  
Element Analysis ◽  
Spot Welded

This dissertation presents the finite element based prediction of residual stress generation in a spot welded joint during the spot welding process and the effects of residual stress on fatigue behavior of a spot welded joint. Spot welded advanced high strength steels, namely dual phase DP600 GI and transformation induced plasticity TRIP600 steels were investigated for their fatigue life, microstructure changes and fatigue fracture mechanisms to develop design data for possible application in future light weight and more fuel efficiency automobiles.

scholarly journals Fatigue behavior of Al-Al and Al-steel refill friction stir spot welding joints

2021 ◽  
Author(s):  
Haokun Yang ◽  
detao Cai ◽  
Jiaxin Li ◽  
ChinYung Kwok ◽  
yunqiao Zhao ◽  
...  
Keyword(s):  
Spot Welding ◽  
Fatigue Behavior ◽  
Friction Stir Spot Welding ◽  
Friction Stir ◽  
Welding Joints

scholarly journals Some aspects of modelling and simulation of spot welding

2018 ◽  
Vol 178 ◽  
pp. 03006
Author(s):  
Viorel Cohal
Keyword(s):  
Welded Joints ◽  
Spot Welding ◽  
Thermal Field ◽  
Base Material ◽  
Heat Losses ◽  
Thermal Source ◽  
Thermal Processes ◽  
Element Analysis ◽  
Material Density ◽  
Composition And Structure

Mathematical modelling and finite element analysis of thermal processes, much more complex in welding different metals in terms of chemical composition and structure, have allowed investigation and deepening of heat transfer phenomena and the establishment of a new technological spot welding variant for these joints. The distribution of temperatures in welded joints is influenced by the linear energy of the thermal source, the thermal properties of the base material (heat specific heat conductivity, material density and thermal diffusivity) and heat losses to the environment. Thermal field viewing, longitudinal and transverse variations of temperature in heterogeneous welded joints, as well as temperature values recorded at different nodes (points) located in the welding area and adjacent areas, lead to conclusions that will result in specific spot welding technologies.

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