Failure Behavior Analysis of Resistance Spot Welding Joints of DP780 Dual-phase Steel under Dynamic Load

doi:10.3901/JME.2021.02.070

Abstract

Abstract: The resistance spot welding joints of DP780 dual-phase steel are used to study the failure behavior under different tensile speeds. The digital image correlation (Digital image correlation, DIC) technique is used to analyze the full-field strain of the joints. At the same time, the micro fracture morphology of the joints under different failure modes is analyzed. Results show that the failure modes of the joints are interface fracture and nugget pull-out under quasi-static and dynamic stretching. With the increase of tensile speed, the failure position of the joints changes from interface fracture to base metal tear. The peak load and energy absorption values of joint failure increase gradually. The peak load of 2 mm/min is 21.08 kN. Compared with 2 mm/min, the peak load of 2 m/s, 6 m/s and 10 m/s is increased by 26.57%, 46.92% and 63.99%, respectively. The energy absorption values at these four test speeds are 10.16 J, 31.37 J, 52.83 J, and 63.77 J, respectively. Due to the nugget deflection of the lap joints during stretching, the tensile action above the solder joint is dominant and the compression action is dominant below. Different degrees of the nugget deflection will cause different failure modes of the joints. The friction stratification of the joint fracture dimples becomes more and more severe with the increase of tensile speed.

Key words: resistance spot welding, dual-phase steel, dynamic stretching, digital image correlation, failure behavior

CLC Number:

TG443

CUI Junjia, DONG Dongying, WANG Qiong, LI Guangyao. Failure Behavior Analysis of Resistance Spot Welding Joints of DP780 Dual-phase Steel under Dynamic Load[J]. Journal of Mechanical Engineering, 2021, 57(2): 70-79.

References

[1] 陈明,刘渊媛,余立. 780 MPa级CSP流程双相钢动态性能本构模型[J]. 精密成形工程,2017,9(6):20-26. CHEN Ming,LIU Yuanyuan,YU Li. Constitutive model for dynamic property of 780 MPa CSP short process dual phase steel[J]. Journal of Netshape Forming Engineering,2017,9(6):20-26.
[2] MA Yali,TAN Jianrong,WANG Delun,et al. Light-weight design method for force-performance-structure of complex structural part based co-operative optimization[J]. Chinese Journal of Mechanical Engineering,2018,31(1):1-9.
[3] ZHANG Yubo,LUO Hongyun,ZHONG Qunpeng,et al. Characterization of passive films formed on as-received and sensitized AISI 304 stainless steel[J]. Chinese Journal of Mechanical Engineering,2019,32(1):1-12.
[4] 解瑞军,李从增,郑纲,等. TRIP980高强钢电阻点焊接头的组织及力学性能[J]. 焊接学报,2019,40(1):119-123,136. XIE Ruijun,LI Congzeng,ZHENG Gang,et al. Microstructure and mechanical properties of TRIP980 high strength resistance spot welding joints[J]. Transactions of the China Welding Institution,2019,40(1):119-123,136.
[5] 谢延敏,张飞,王子豪,等. 基于渐变凹模圆角半径的高强钢扭曲回弹补偿[J]. 机械工程学报,2019,55(2):91-97. XIE Yanmin,ZHANG Fei,WANG Zihao,et al. Compensation of twist springback in high-strength steel based on gradient die radius[J]. Journal of Mechanical Engineering,2019,55(2):91-97.
[6] 林利,梁文,朱国明,等. Q&P工艺对1800 MPa新型热成形钢微观组织和力学性能的影响[J]. 机械工程学报,2019,55(10):77-85. LIN Li,LIANG Wen,ZHU Guoming,et al. Influence of quenching and partitioning process on microstructure and mechanical properties of a novel 1800 MPa hot stamping steel[J]. Journal of Mechanical Engineering,2019,55(10):77-85.
[7] 高原,陈玉华,占字林,等. Ti/Al异种金属微电阻点焊接头力学性能及显微组织[J]. 精密成形工程,2018,10(4):90-95. GAO Yuan,CHEN Yuhua,ZHAN Zilin,et al. Mechanical properties and microstructure of Ti/Al joint of micro-resistance welding[J]. Journal of Netshape Forming Engineering,2018,10(4):90-95.
[8] 周磊磊,余腾义. DP780冷轧板电阻点焊工艺研究[J]. 钢铁钒钛,2018,39(4):159-163. ZHOU Leilei,YU Tengyi. Research on resistance spot welding process of DP780 cold rolled sheet[J]. Iron Steel Vanadium Titanium,2018,39(4):159-163.
[9] 易金权,曾凯,邢保英,等. DP590高强钢双脉冲胶焊连接工艺研究及数值模拟[J]. 宇航材料工艺,2019(4):11-16. YI Jinquan,ZENG Kai,XING Baoying,et al. Investigation and numerical simulation on double-pulse weld bonding connection process for DP590 high strength steel[J]. Aerospace Materials & Technology,2019(4):11-16.
[10] 易金权,曾凯,丁燕芳,等. DP590高强钢双脉冲胶接点焊的工艺研究[J]. 材料科学与工艺,2019,27(4):91-96. YI Jinquan,ZENG Kai,DING Yanfang,et al. Investigation on double pulse weld bonding for DP590 high strength steel[J]. Materials Science and Technology,2019,27(4):91-96.
[11] 吕冬,芦延鹏,刘仁东,等. 冷轧DP980电阻点焊接头断裂模式特征与组织分析[J]. 焊接,2019(10):52-57. LÜ Dong,LU Yanpeng,LIU Rendong,et al. Fracture mode characteristics and microstructure analysis of resistance spot welded joint of cold rolled DP980[J]. Welding & Joining,2019(10):52-57.
[12] SIVARAJ P,SEEMAN M,KANAGARAJAN D,et al. Influence of welding parameter on mechanical properties and microstructural features of resistance spot welded dual phase steel sheets joint[J]. Materials Today:Proceedings,2020,22(3):558-562.
[13] WAN Xiaodong,WANG Yuanxun,ZHANG Peng,et al. Modelling the effect of welding current on resistance spot welding of DP600 steel[J]. Journal of Materials Processing Technology,2014,214:2723-2729.
[14] BANERJEE P,SARKAR R,PAL T K,et al. Effect of nugget size and notch geometry on the high cycle fatigue performance of resistance spot welded DP590 steel sheets[J]. Journal of Materials Processing Technology,2016,238:226-243.
[15] 万晓东,徐靖,王元勋,等. 双相钢电阻点焊应力与变形行为数值分析[J]. 焊接学报,2017,38(6):79-82. WAN Xiaodong,XU Jing,WANG Yuanxun,et al. Numerical simulation on stress and deformation behavior in resistance spot welding of dual phase steel[J]. Transactions of the China Welding Institution,2017,38(6):79-82.
[16] PANDYA K S,GROLLEAU V,ROTH C C,et al. Fracture response of resistance spot welded dual phase steel sheets:Experiments and modeling[J]. International Journal of Mechanical Sciences,2020,187:105869.
[17] ZHANG Hongqiang,WEI Ajuan,QIU Xiaoming,et al. Microstructure and mechanical properties of resistance spot welded dissimilar thickness DP780/DP600 dual-phase steel joints[J]. Materials and Design,2014,54:443-449.
[18] 贺优优,刘伟杰. 新型双相高强钢点焊接头拉剪力学性能与组织分析[J]. 焊接,2017(5):40-43. HE Youyou,LIU Weijie. Shear mechanical property and microstructure of spot welded joint of a new dual-phase high strength steel[J]. Welding & Joining,2017(5):40-43.
[19] 肖智杰. DP590高强钢双脉冲胶接点焊连接工艺及接头力学性能研究[D]. 昆明:昆明理工大学,2018. XIAO Zhijie. Study on the connection process and the strength of DP590 dual-phase steel weld-bonded joint[D]. Kunming:Kunming University of Science and Technology,2018.
[20] BADKOOBEH F,NOURI A,HASSANNEJAD H,et al. Microstructure and mechanical properties of resistance spot welded dual-phase steels with various silicon contents[J]. Materials Science & Engineering A,2020,790:139703.
[21] BAKER S,MATTHEWS I. Equivalence and efficiency of image alignment algorithms[C]//Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition,2001,1:1090-1097.
[22] BAKER S,MATTHEWS I. Lucas-Kanade 20 years on:A unifying framework[J]. International Journal of Computer Vision,2004,56(3):221-255.
[23] 袁涛,罗震,李洋,等. 基于二维DIC技术的电阻点焊板件变形分析[J]. 焊接学报,2015,36(11):53-56,115-116. YUAN Tao,LUO Zhen,LI Yang,et al. Study on welding deformation of resistance spot welding using two-dimensional DIC technique[J]. Transactions of the China Welding Institution,2015,36(11):53-56,115-116.
[24] 祝洪川,王有禄,吴青松,等. 高强钢点焊接头动态失效载荷探讨[J]. 物理测试,2016,34(5):23-27. ZHU Hongchuan,WANG Youlu,WU Qingsong,et al. Discussion on dynamic failure load of spot-welded joint for high-strength steel[J]. Physics Examination and Testing,2016,34(5):23-27.
[25] LI Y B,SHEN Q,LIN Z Q,et al. Quality improvement in resistance spot weld of advanced high strength steel using external magnetic field[J]. Science and Technology of Welding and Joining,2011,16(5):465-469.