scholarly journals Fatigue Strength of Spot Welded Mild Steel Joints and Its Improvement by Cold Working

1971 ◽  
Vol 20 (217) ◽  
pp. 1094-1100 ◽  
Author(s):  
Shigetsune AOYAMA ◽  
Masao FUJIMOTO
Keyword(s):  
Fatigue Strength ◽  
Mild Steel ◽  
Cold Working ◽  
Steel Joints ◽  
Spot Welded

Influence of Strength Level of Steels on Fatigue Strength and Fracture Morphology of Spot Welded Joints

2011 ◽  
Vol 462-463 ◽  
pp. 94-99
Author(s):  
Keiichiro Tohgo ◽  
Tomoya Ohguma ◽  
Yoshinobu Shimamura ◽  
Yoshifumi Ojima
Keyword(s):  
Finite Element ◽  
Fatigue Strength ◽  
Mild Steel ◽  
Welded Joints ◽  
High Strength ◽  
Fracture Morphology ◽  
Fatigue Tests ◽  
Finite Element Analyses ◽  
Ultra High Strength Steel ◽  
Spot Welded

In this paper, fatigue tests and finite element analyses are carried out on spot welded joints of mild steel (270MPa class) and ultra-high strength steel (980MPa class) in order to investigate the influence of strength level of base steels on fatigue strength and fracture morphology of spot welded joints. From the fatigue tests the following results are obtained: (1) Fatigue limit of spot welded joints is almost the same in both steels. (2) Fatigue fracture morphology of spot welded joints depends on the load level in the ultra-high strength steel, but not in the mild steel. From discussion based on the finite element analyses the following results are obtained: (3) The fatigue limit of spot welded joints can be predicted by stress intensity factors for a nugget edge, fracture criterion for a mixed mode crack and threshold value for fatigue crack growth in base steel. (4) Plastic deformation around a nugget in spot welded joints strongly affects the fatigue fracture morphology.

The Effects of Post-Weld Cold Working Processes on the Fatigue Strength of Low Carbon Steel Resistance Spot Welds

2005 ◽  
Vol 127 (4) ◽  
pp. 718-723 ◽  
Author(s):  
R. Spitsen ◽  
D. Kim ◽  
B. Flinn ◽  
M. Ramulu ◽  
E. T. Easterbrook
Keyword(s):  
Fatigue Strength ◽  
Carbon Steel ◽  
Cold Working ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Spot Welds ◽  
Working Process ◽  
Resistance Spot ◽  
Resistance Spot Welds ◽  
Spot Welded

The investigation on the use of a post-weld cold working process to improve fatigue strength of low carbon steel resistance spot welds is presented. The cold working process generates uniform and consistent large zones of compressive residual stresses in resistance spot-welded low carbon steel structures using a specially designed indentation device. The effect of the indentation process parameters on the mechanical properties of the resistance spot weld was investigated. Comparisons of the mechanical properties and qualitative results between the as-resistance spot-welded specimens and the post-weld cold worked resistance spot-welded specimens have been made in this investigation. Fatigue testing was also conducted to evaluate the effect of post-weld cold working process on the fatigue characteristics of resistance spot welds. Results showed that a significant improvement in the fatigue strength has been achieved through the post-weld cold working process.

scholarly journals Improvement in Fatigue Strength of Spot Welded High Strength Sheet Steel Joints

1982 ◽  
Vol 68 (9) ◽  
pp. 1444-1451 ◽  
Author(s):  
Masatoshi SHINOZAKI ◽  
Toshiyuki KATO ◽  
Toshio IRIE ◽  
Isao TAKAHASHI
Keyword(s):  
Fatigue Strength ◽  
Sheet Steel ◽  
High Strength ◽  
Steel Joints ◽  
Spot Welded

scholarly journals Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Metals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 306 ◽  
Author(s):  
Martin Leitner ◽  
Yukitaka Murakami ◽  
Majid Farajian ◽  
Heikki Remes ◽  
Michael Stoschka
Keyword(s):  
Fatigue Strength ◽  
Mild Steel ◽  
Strength Assessment ◽  
Fatigue Strength Assessment ◽  
Steel Joints

Effect of post-weld heat treatment on the fatigue strength of HFMI-treated mild steel joints

2015 ◽  
Vol 59 (6) ◽  
pp. 861-873 ◽  
Author(s):  
M. Leitner ◽  
W. Mössler ◽  
A. Putz ◽  
M. Stoschka
Keyword(s):  
Heat Treatment ◽  
Fatigue Strength ◽  
Mild Steel ◽  
Post Weld Heat Treatment ◽  
Steel Joints ◽  
Weld Heat

Spot Weldability Assessment of Similar and Dissimilar Steel Sheets for Light Weight Automobile Body

2006 ◽  
Vol 306-308 ◽  
pp. 899-904
Author(s):  
Dong Ho Bae ◽  
Won Seok Jung ◽  
J.B. Heo
Keyword(s):  
Stainless Steel ◽  
Fatigue Strength ◽  
Lap Joints ◽  
Vehicle Body ◽  
Rolled Steel ◽  
Cold Rolled Steel ◽  
Steel Sheets ◽  
Automobile Body ◽  
Cold Rolled ◽  
Spot Welded

An effective way to reduce the weight of vehicle body seems to be application of new materials, and such trend is remarkable. Among the various materials for automobile body, stainless steel sheets and cold rolled steel sheets are under the interests. However, in order to guarantee reliability of new material and to establish the long life fatigue design criteria for body structure, it is necessary to assess spot weldability and fatigue strength of spot welded lap joints fabricated under optimized spot welding condition. In this paper, spot weldability of stainless steel sheets, STS301L and STS304L, and cold rolled steel sheets, SPCC and SPCD. Fatigue strength of lap joints spot welded between similar and dissimilar materials were also assessed.

The effect of epoxy coating on the fatigue strength of grade-A mild steel

2021 ◽  
pp. 1-11
Author(s):  
Hamidreza Mirghaderi ◽  
Ahmad Rahbar Ranji ◽  
Manochehr Fadavie
Keyword(s):  
Fatigue Strength ◽  
Mild Steel ◽  
Epoxy Coating
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