Fatigue Strength of Single Spot-Welded Joints of Rephosphorized High-Strength and Low-Carbon Steel Sheets

1985 ◽  
Author(s):  
Hideo Kitagawa ◽  
Tsugihiko Satoh ◽  
Masao Fujimoto
Keyword(s):  
Fatigue Strength ◽  
Carbon Steel ◽  
Welded Joints ◽  
Low Carbon Steel ◽  
High Strength ◽  
Low Carbon ◽  
Single Spot ◽  
Steel Sheets ◽  
Spot Welded

Reliability Increase of Dissimilar Steel Welded Joints

2014 ◽  
Vol 698 ◽  
pp. 378-381 ◽  
Author(s):  
Alexandra Chevakinskaya ◽  
Aelita Nikulina ◽  
Natalia Plotnikova
Keyword(s):  
Carbon Steel ◽  
Welded Joints ◽  
Rail Steel ◽  
High Carbon Steel ◽  
Low Carbon Steel ◽  
High Strength ◽  
Hadfield Steel ◽  
Nickel Steel ◽  
Low Carbon ◽  
High Carbon

In this paper combined Hadfield steel - stainless steel - rail steel compounds are considered. Structural studies and estimation of mechanical properties showed that using an intermediate layer of low-carbon steel with 0.2 C wt. % and 5-20 mm thick between high-carbon steel and chromium-nickel steel in the formation of welded joints increases the reliability of connections by reducing the amount of high-strength zones as compared to compounds without a barrier layer.

scholarly journals Preparation and Mechanical Behavior of Ultra-High Strength Low-Carbon Steel

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 459 ◽  
Author(s):  
Zhiqing Lv ◽  
Lihua Qian ◽  
Shuai Liu ◽  
Le Zhan ◽  
Siji Qin
Keyword(s):  
Carbon Steel ◽  
Aging Time ◽  
Rolling Direction ◽  
Low Carbon Steel ◽  
High Strength ◽  
Rolling Reduction ◽  
Low Carbon ◽  
Steel Sheets ◽  
Cold Rolling Reduction ◽  
Cold Rolled

The low-carbon steel (~0.12 wt%) with complete martensite structure, obtained by quenching, was cold rolled to get the high-strength steel sheets. Then, the mechanical properties of the sheets were measured at different angles to the rolling direction, and the microstructural evolution of low-carbon martensite with cold rolling reduction was observed. The results show that the hardness and the strength gradually increase with increasing rolling reduction, while the elongation and impact toughness obviously decrease. The strength of the sheets with the same rolling reduction are different at the angles of 0°, 45°, and 90° to the rolling direction. The tensile strength (elongation) along the rolling direction is higher than that in the other two directions, but the differences between them are not obvious. When the aging was performed at a low temperature, the strength of the initial martensite and deformed martensite increased with increasing aging time during the early stages of aging, followed by a gradual decrease with further aging. However, the elongation increases with increasing aging time. The change of hardness is consistent with that of strength for the cold-rolled martensite, while the hardness of the initial martensite decreases gradually with increasing aging time.

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.

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