Influence of dynamic loading on failure behavior of spot welded automotive steel sheets

2018 ◽  
Vol 144 ◽  
pp. 407-426 ◽  
Author(s):  
Wooram Noh ◽  
Youngwoo Koh ◽  
Kwansoo Chung ◽  
Jung-Han Song ◽  
Myoung-Gyu Lee
Keyword(s):  
Dynamic Loading ◽  
Failure Behavior ◽  
Steel Sheets ◽  
Automotive Steel ◽  
Spot Welded

Fatigue Life of Multi-Lap Welding of Automotives Steel Sheet by QSTS

2008 ◽  
Vol 33-37 ◽  
pp. 151-156
Author(s):  
Seung Chul Shin ◽  
Sung Mo Yang ◽  
Hyo Sun Yu ◽  
Hee Yong Kang ◽  
Chae Won Kim
Keyword(s):  
Life Cycle ◽  
Fatigue Life ◽  
Welded Joints ◽  
Fuel Efficiency ◽  
Life Extension ◽  
Steel Sheets ◽  
Whole Process ◽  
Lap Welding ◽  
Automotive Steel ◽  
Spot Welded

This paper shows how the number of lap of spot welded joints in automotive steel sheets changes the life -cycle transform of itself. There has been significant developments in the life extension of automotive steel sheets, as well as in passenger safety. We verified the validity of the S-N curve of materials by QSTS test. Moreover, we used EZNCEN and HS40R, which are commonly used as automotive steel sheets because of their excellence in increasing fuel efficiency. The purpose of research was to compare the fatigue life of multi - lap of spot welded joints to there. In addition s, we used the two different kinds of sheets together in the same welding under the same condition. Through this whole process, the hypothesis on the life cycle of lethargy coefficients was found to be in good agreement with the result of the experiment. That is, when using sheets of the same materials in one welding, the fatigue life of two laps of a spot welded joint was found to be much superior by EZNCEN 5~14%, HS40R 17~30%,and when using each sheet of different materials, we found the decrease in fatigue life by 6~16%. Finally, the best value from the data was chosen based on the experiment for the analysis of the fatigue life of each layer.

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.

scholarly journals EFFECT OF PROCESS PARAMETERS ON THE MECHANICAL PROPERTIES AND FAILURE BEHAVIOR OF SPOT WELDED LOW CARBON STEEL

2015 ◽  
Vol 8 ◽  
pp. 1489-1497 ◽  
Author(s):  
Farizah Adliza Ghazali ◽  
◽  
Yupiter H.P. Manurung ◽  
Mohamed Ackiel Mohamed ◽  
Siti Khadijah Alias ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Process Parameters ◽  
Low Carbon Steel ◽  
Failure Behavior ◽  
Low Carbon ◽  
Spot Welded

scholarly journals Study of Solidification Cracking Susceptibility during Laser Welding in an Advanced High Strength Automotive Steel

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 673 ◽  
Author(s):  
Gautam Agarwal ◽  
He Gao ◽  
Murugaiyan Amirthalingam ◽  
Marcel Hermans
Keyword(s):  
Laser Welding ◽  
High Strength ◽  
Free Edge ◽  
Processing Parameters ◽  
Solidification Cracking ◽  
Transverse Strain ◽  
Cracking Behavior ◽  
Steel Sheets ◽  
Weld Solidification Cracking ◽  
Automotive Steel

Susceptibility to weld solidification cracking in transformation-induced plasticity steel sheets was studied using a modified standard hot cracking test used in the automotive industry. To vary the amount of self-restraint, bead-on-plate laser welding was carried out on a single-sided clamped specimen at increasing distances from the free edge. Solidification cracking was observed when welding was carried out close to the free edge. With increasing amount of restraint, the crack length showed a decreasing trend, and at a certain distance, no cracking was observed. With the aid of a finite element-based model, dynamic thermal and mechanical conditions that prevail along the transverse direction of the mushy zone are used to explain the cracking susceptibility obtained experimentally. The results indicate that the transverse strain close to the fusion boundary can be used as a criterion to predict the cracking behavior. The outcome of the study shows that optimum processing parameters can be used to weld steels closer to the free edge without solidification cracking.

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