Heat distribution in welds by short-time high-current post-heating and its improving effect on cross tension strength: development of resistance spot welding with pulsed current pattern for ultrahigh-strength steel sheets

2016 ◽  
Vol 30 (11) ◽  
pp. 817-825 ◽  
Author(s):  
Koichi Taniguchi ◽  
Hiroshi Matsuda ◽  
Rinsei Ikeda ◽  
Kenji Oi
Keyword(s):  
Spot Welding ◽  
Strength Development ◽  
High Current ◽  
Current Pattern ◽  
Steel Sheets ◽  
Ultrahigh Strength ◽  
Development Of Resistance ◽  
Ultrahigh Strength Steel ◽  
Short Time ◽  
Cross Tension

Press-Shaving Characteristics of Ultrahigh-Strength Steel Sheets

2013 ◽  
Vol 554-557 ◽  
pp. 1879-1886 ◽  
Author(s):  
Masao Murakawa ◽  
Kenta Nakamura ◽  
Tomio Shionome ◽  
Fumitoshi Komuro ◽  
Giichirou Muro ◽  
...  
Keyword(s):  
Surface Quality ◽  
New Technologies ◽  
High Strength ◽  
Process Conditions ◽  
Steel Sheets ◽  
Ultrahigh Strength ◽  
Ultrahigh Strength Steel ◽  
Experimental Researches ◽  
Very High

The paper proposes new technologies able to improve the surface quality in the case of press-shaving applied to very high strength materials. Experimental researches were developed and the best combination of process conditions was identified.

scholarly journals Smooth Hole Piercing of Ultrahigh-strength Steel Sheets by Means of Press-shaving

2016 ◽  
Vol 57 (663) ◽  
pp. 366-368
Author(s):  
Akira HARAI ◽  
Manabu SUZUKI ◽  
Akira MATSUMOTO ◽  
Fumitoshi KOMURO ◽  
Tomio SHIONOME ◽  
...  
Keyword(s):  
Steel Sheets ◽  
Ultrahigh Strength ◽  
Ultrahigh Strength Steel

Effect of Gap between Steel Sheet and Electrode on Resistance Spot Welding

2018 ◽  
Vol 941 ◽  
pp. 158-163 ◽  
Author(s):  
Sho Matsui ◽  
Chisato Wakabayashi ◽  
Shinji Kodama
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Joint Strength ◽  
Steel Sheet ◽  
High Tensile Strength ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Tension Tests ◽  
Cross Tension

If resistance spot welding (RSW) is conducted when there is a gap between a steel sheet and an unmovable electrode, the steel sheets are bended by a movable electrode, and the quality of RSW is influenced. Therefore, it is necessary to understand the effect of the gap on RSW. In this study, two high-tensile strength steel sheets were welded with the gap. In addition, cross-section observations and cross tension tests were conducted to verify the effect of the gap on weldability and joint strength. Consequently, two notable results were obtained. First, the observation indicated that deformation around the corona-bond was varied depending on the gap. Second, the cross tension tests showed that the gap decreased the joint strength even though the nugget was large enough. These result indicated that controlling the gap is important to ensure the quality of RSW.

scholarly journals Precision Piercing and Blanking of Ultrahigh-strength Steel Sheets

2014 ◽  
Vol 81 ◽  
pp. 1114-1120 ◽  
Author(s):  
Masao Murakawa ◽  
Manabu Suzuki ◽  
Tomio Shionome ◽  
Fumitoshi Komuro ◽  
Akira Harai ◽  
...  
Keyword(s):  
Steel Sheets ◽  
Ultrahigh Strength ◽  
Ultrahigh Strength Steel
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