【摘 要】
：
Resistance spot brazing was used to perform the lap test of pure aluminum 1060 and SGCC hot-dip galvanized steel plate, the joint interface structure was studie
【机 构】
：
State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology
论文部分内容阅读
Resistance spot brazing was used to perform the lap test of pure aluminum 1060 and SGCC hot-dip galvanized steel plate, the joint interface structure was studied, and the mechanical properties of the joint were tested. The results show that the aluminum-silicon (Al-Si) alloy solder used in the test has good wetting, and an intermetallic compound with a double-layer structure and uneven thickness is pro-duced at the welded joint interface after welding. The thickness is <10 μm. The welding current is at 7.8 kA, the tensile shear load of the joint reaches a peak value of about 4.72 kN. Under the same process parameters, the tensile shear load of the resistance spot brazed joint is significantly higher than that of the spot welded joint. The joint fracture mostly occurs on the aluminum plate side, and mainly at the heat-af-fected zone and not at the welding point.It indicates that the quality of the spot brazed joint is good, but due to the local “unbrazed” defect on the aluminum side interface of the weld, tensile stress will occur at the weld interface and the stress effect on the intermetallic compound. It is easy to produce cracks.
其他文献
为合理利用南海及其沿岸港口资源,在考虑邮船航线的吸引力和可靠性的基础上,研究南海邮船航线的设计方案。对停靠港口选定及其排序、各航段船舶航速的设定和船舶在港时间(开始时间和服务时间)进行决策,以总成本最小化和航线吸引力最大化为目标,建立邮船航线混合线性规划模型,并提出求解该模型的算法。对南海邮船航线的设计进行实际数据分析,并选取航线数量和停靠港口数量的限制对该模型进行灵敏度分析。研究结果表明:优化后的航线方案能有效平衡邮船航线的吸引力和总成本,为南海邮船航线的开发提供决策依据。
With the rapid development of low alloy steel strength level, more problems caused by welding are exposed day by day. Re-cently, the efforts have been paid to i
Through laser swing welding of dissimilar steels, the microstructure and properties of welded joints of dissimilar steels under dif-ferent heat treatment proces
为提高Kalman滤波算法的准确性和鲁棒性,提出一种基于自适应分数阶系统的Kalman滤波算法,设计状态噪声协方差选择的自适应机制,推导其数学过程。将该算法应用到船舶视觉跟踪中,选取不同河流的CCTV(Closed Circnit Television)船舶监控视频(包括不同情况下的内河船舶运动监控),针对不同船舶大小、复杂光照、不同明暗度、多船会遇和多船追越等情况进行船舶视觉跟踪。对不同分数阶下的跟踪误差和准确度进行分析,并将分数阶Kalman滤波器与整数阶滤波器相比,说明其具有更宽的参数选择范围和更高
The application of ultrasonic vibration in the welding process can effectively suppress the pore defects of the weld. The different ultrasonic application metho
4月20日,推进全要素水上“大交管”建设现场会在浙江宁波召开.中国海事局局长曹德胜出席会议并强调,建设“陆海空天”一体化水上交通运输安全保障体系是实施交通强国战略的具
The asymmetric thermo-physical mechanism of the resistance spot welding technique with intermediate frequency (2 kHz) and direct current (RSWIFDC) on the high s
船舶会遇态势辨识是实现船舶安全避碰的重要前提,交汇水域复杂的通航环境和船舶运动的不确定性使在辨识会遇态势过程中容易出现误判的情况。为准确快速辨识交汇水域的船舶会遇态势,提出联合支持向量机-贝叶斯滤波(Support Vector Machine and Bayesian Filter,SVM-BF)的辨识会遇态势模型和算法。基于会遇几何模型计算两船的相对距离和航向差作为会遇特征,并将特征序列输入模型,在SVM初辨识的基础上,使用BF器对SVM产生的初判结果进行累积判别,提高辨识不同会遇态势的准确性。选取长
本届大会上,一系列精彩纷呈的分论坛也陆续拉开帷幕,学术论坛的数量最多,主要探讨小卫星技术、航天总体技术、近空间飞行与行星进入、航天大数据、运载器发动机等议题.rn航天
内河弯曲河段水流流态复杂多变,导致船舶过弯操纵存在困难,驾驶员大多依靠操船经验操作,但统计结果表明,水上发生交通安全事故大多与“人(驾驶员)”有关,其中人为失误因素导