激光点焊花样对高强钢接头力学性能的影响
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摘要
设计了8种激光点焊花样,并将其分别应用于DP980和QP1180两种超高强钢的激光搭接焊上。通过拉伸试验机和专用夹具对这两种材料的8种点焊花样接头的十字拉伸、剪切拉伸和剥离性能进行了测量和分析。结果显示,点焊花样对DP980和QP1180的十字拉伸和剪切拉伸载荷有显著影响,对DP980的剥离载荷影响较大,但对QP1180的剥离载荷影响有限(除I形外)。不同点焊花样的焊缝长度与十字拉伸、剪切拉伸和剥离载荷的相关性不明显。其中,S形、O形和Z形的剪切拉伸载荷超过了30000 N,是C形的1.5倍以上。综合考虑成本和性能,O形焊缝的优势较为明显,虽然其焊缝长度比常用的C形高1倍,但其十字拉伸和剪切拉伸载荷有显著提高。
8 kinds of laser spot welding patterns were designed, which were implemented on laser lap welding of DP980 and QP1180 ultra-high strength steel respectively. By the tensile test machine and special jigs, the mechanical properties(like cross tensile, shear tensile and peeling) of 8 kinds of laser spot pattern joints were measured and analyzed. The results show that the patterns influence the loads of cross tensile and shear tensile of DP980 and QP1180 obviously. The patterns also affect the peeling load of DP980, but the influence of pattern on peeling load of QP1180 is limited(expect the I shape). The relationship between the lengths of weld and loads of cross tensile, shear tensile and peeling is not obviously. The loads of shear tensile of S, O and Z type patterns are over 30000 N which is 1.5 time of that of C type pattern. Considering of the cost and properties, the O type weld has more advantages and its loads of cross tensile and shear tensile improve significantly,though its length of weld is 2 times of that of C type weld.
8 kinds of laser spot welding patterns were designed, which were implemented on laser lap welding of DP980 and QP1180 ultra-high strength steel respectively. By the tensile test machine and special jigs, the mechanical properties(like cross tensile, shear tensile and peeling) of 8 kinds of laser spot pattern joints were measured and analyzed. The results show that the patterns influence the loads of cross tensile and shear tensile of DP980 and QP1180 obviously. The patterns also affect the peeling load of DP980, but the influence of pattern on peeling load of QP1180 is limited(expect the I shape). The relationship between the lengths of weld and loads of cross tensile, shear tensile and peeling is not obviously. The loads of shear tensile of S, O and Z type patterns are over 30000 N which is 1.5 time of that of C type pattern. Considering of the cost and properties, the O type weld has more advantages and its loads of cross tensile and shear tensile improve significantly,though its length of weld is 2 times of that of C type weld.
引文
[1] Grajcar A, Morawiec M, Rózański M, et al. Twin-spot laser welding of advanced high-strength multiphase microstructure steel[J]. Optics&Laser Technology, 2017, 92:52-61.
[2] Kundu J, Ray T, Kundu A, et al. Effect of the laser power on the mechanical performance of the laser spot welds in dual phase steels[J]. Journal of Materials Processing Technology, 2019, 267:114-123.
[3] Wang X, Shao M, Gao S, et al. Numerical simulation of laser impact spot welding[J]. Journal of Manufacturing Processes,2018, 35:396-406.
[4] Pardal G, Meco S, Dunn A, et al. Laser spot welding of laser textured steel to aluminium[J]. Journal of Materials Processing Technology, 2017, 241:24-35.
[5] Li L, Xia H, Ma G, et al. Flow dynamics during single-and dual-spot laser welding with one common keyhole of 321 stainless steel[J]. Journal of Materials Processing Technology, 2018, 255:841-852.
[6] Simonds B, Sowards J, Hadler J, et al. Dynamic and absolute measurements of laser coupling efficiency during laser spot welds[J]. Procedia Cirp, 2018, 74:632-635.
[7] Braunreuther S, Hammerstingl V, Schweier M, et al. Welding joint detection by calibrated mosaicking with laser scanner systems[J]. Cirp Journal of Manufacturing Science and Technology,2015, 10:16-23.
[8] Miyagi M, Zhang X, Kawahito Y, et al. Surface void suppression for pure copper by high-speed laser scanner welding[J]. Journal of Materials Processing Technology, 2017, 240:52-59.
[9] Kim D, Park Y. Weldability evaluation and tensile strength estimation model for aluminum alloy lap joint welding using hybrid system with laser and scanner head[J]. Transactions of Nonferrous Metals Society of China, 2012, 22:596-604.
[2] Kundu J, Ray T, Kundu A, et al. Effect of the laser power on the mechanical performance of the laser spot welds in dual phase steels[J]. Journal of Materials Processing Technology, 2019, 267:114-123.
[3] Wang X, Shao M, Gao S, et al. Numerical simulation of laser impact spot welding[J]. Journal of Manufacturing Processes,2018, 35:396-406.
[4] Pardal G, Meco S, Dunn A, et al. Laser spot welding of laser textured steel to aluminium[J]. Journal of Materials Processing Technology, 2017, 241:24-35.
[5] Li L, Xia H, Ma G, et al. Flow dynamics during single-and dual-spot laser welding with one common keyhole of 321 stainless steel[J]. Journal of Materials Processing Technology, 2018, 255:841-852.
[6] Simonds B, Sowards J, Hadler J, et al. Dynamic and absolute measurements of laser coupling efficiency during laser spot welds[J]. Procedia Cirp, 2018, 74:632-635.
[7] Braunreuther S, Hammerstingl V, Schweier M, et al. Welding joint detection by calibrated mosaicking with laser scanner systems[J]. Cirp Journal of Manufacturing Science and Technology,2015, 10:16-23.
[8] Miyagi M, Zhang X, Kawahito Y, et al. Surface void suppression for pure copper by high-speed laser scanner welding[J]. Journal of Materials Processing Technology, 2017, 240:52-59.
[9] Kim D, Park Y. Weldability evaluation and tensile strength estimation model for aluminum alloy lap joint welding using hybrid system with laser and scanner head[J]. Transactions of Nonferrous Metals Society of China, 2012, 22:596-604.