Impact of Liquid Metal Cracks on Strength of Spot-Welded Joints
Author Information
Author(s): Zou Jie, Xiang Huayang, Zhan Zhenfei, Zhuo Wenbo, Huang Li, Ji Yuxiang, Liu Qing
Primary Institution: Chongqing Jiaotong University
Hypothesis
How do liquid metal embrittlement cracks affect the strength and fatigue life of spot-welded joints in galvanized Q&P980 steel?
Conclusion
Liquid metal embrittlement cracks significantly reduce the static strength and fatigue life of spot-welded joints in galvanized Q&P980 steel.
Supporting Evidence
- LME cracks were observed only in galvanized samples, indicating the zinc coating's role in their formation.
- Quasi-static tensile tests showed a 23% reduction in strength for galvanized samples compared to uncoated samples.
- Fatigue tests revealed that galvanized samples had an average fatigue life of 20,892 cycles, significantly lower than the 41,403 cycles for non-galvanized samples.
- Finite element simulations confirmed that LME cracks influence the stress and strain fields during joint failure.
Takeaway
When welding galvanized steel, cracks can form that make the joints weaker and more likely to break over time.
Methodology
The study used resistance spot welding experiments, quasi-static tensile tests, and finite element simulations to analyze the effects of LME cracks.
Potential Biases
Potential bias in the selection of welding parameters and sample preparation methods.
Limitations
The study primarily focused on galvanized Q&P980 steel and may not be generalizable to other materials or welding methods.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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