T10-20G爆炸焊接复合板

通过选取最佳的爆炸焊接参数,消除了T10－20G爆炸复合板表面的裂纹,使复合率达到100％,微观测试和宏观力学性能检测表明,从起爆端开始,界面波依次为微波状和小波状,消除了大波状界面中不可避免的微观缺陷,界面的结合强度较高     

钛/钢双立式爆炸焊接参数优化

为解决大面积钛/钢爆炸焊接窗口窄,在结合区易出现"过熔"和"射流堆积"等微观缺陷的问题,开展了双立爆炸+轧制综合制造技术,进行了低爆速爆炸焊接用炸药试验优化,发明了一种最低临界爆速爆炸焊接用炸药,设计确定了刚性防护板和柔性防护墙构成的双立综合防护结构及参数,研究了钛/钢爆炸焊接装药厚度窗口.结果表明,双立钛/钢复合板结合界面成波状结合,几乎不存在金属熔化、漩涡等微观缺陷.     

消除爆炸焊接中心不结合区的实验研究

从理论上分析了消除爆炸焊接中心起爆中心不结合区的可能性 ,并分别采用中心起爆和边缘起爆对SA2 6 6 - 30 4爆炸焊接复合板的结合界面及地基下应力进行了对比测试 .实验结果表明只要合理选择装药参数 ,采用中心起爆可获得最佳的焊接界面 .     

金属复合材料爆炸焊接综合技术发展新趋势

为了克服大板面爆炸焊接所面临的冲击波、地震波和噪声对周围环境的影响,实现爆炸焊接行业的大规模标准化生产,对"双立式爆炸焊接"、"水下爆炸焊接"和"爆炸+轧制"等3种新型工艺技术进行了综合分析,从而指出上述技术方法在节能减排、降低危害和质量控制等方面优势明显,运用数值模拟、理论分析和试验测试相结合的方法,对上述技术方法的工艺参数、防护技术及综合运用进行研究是爆炸焊接综合技术发展的新趋势。     

江宁区横溪街道农科教结合富民教育的实践探索

近年来,江宁区横溪街道社区教育工作者结合区域特点,加大与科研院所和大专院校的合作,积极开展农科教结合富民教育课题的理论研究和实践探素,有力地推动了街道农业产业化和特色化发展。     

Design and test of a protective structure for the double vertical explosive welding of large titanium/steel plate

A comprehensive protective structure with rigidity and flexibility was put forward and designed in view of the quality and safety problems for the double vertical explosive welding of large titanium/steel cladding plate. The movement speed and displacement of the protective structure was calculated by establishing its physics model. The dynamics and stabilization properties were analyzed, and the protective structure parameters were optimized and devised. The comprehensive protective structure, which is composed of rigidity unit and flexibility wall, can bear the impact of detonation wave and the high-speed movement of the cladding plate. There are no damage and deformation in the protective structure and the cladding plate. The protective structure can be used many times. The bonding rate of the Ti/steel plate obtained was nearly 100%, and there is no deformation, surface cracks, and big wave and micro-defects. Therefore, the protective problems of the double vertical explosive welding can be solved effectively by the protective structure.     

不锈钢—碳钢单、双面复合板的爆炸焊接及性能研究

研究了不锈钢－碳钢单面、双面复合板爆炸焊接质量,结合界面的微观结构,剪切强度及耐蚀性能,结果表明,单、双面不锈钢－低碳爆炸焊接复合板的结合界面均为波状结构,结合面两侧存在一定组织变形,近界面处为角结晶组织,稍远处为拉伸变形后的维状组织,结合界面碳钢－侧过渡区存在增碳区,不锈钢一侧有一个脱碳层,双面复合界面的结合过渡区的单面为１．５倍宽,脱碳区也接近单面的１．５倍,采用切割爆炸焊接法有利于改善不锈钢－低碳钢复合板的边缘焊合,在同一基板上进行了双面不锈钢复合时,第一面复合界面的剪切强度比第二面复合界面的差,还是双面复合板,其界面结面强度均由起爆端的末端逐渐降低,结合界面的脱碳层对复合的耐蚀性能无明显影响。     

TA2/1060/5083数值模拟及试验

TA2与5083爆炸焊接界面易生成脆性金属间化合物、氧化物、连续熔化区等缺陷,焊接窗口狭窄,最佳焊接参数难以准确获得。本文重构了动态弯折角β和碰撞速度Vf的β-Vf模型,使用SPH-FEM耦合算法,首次运用Steinberg-Guinan材料本构模型进行了炸药厚度为10mm、15mm、20mm,复板厚度为1.5mm的TA2/1060/5083爆炸焊接数值模拟;并采用数值模拟获得的参数开展了爆炸焊接试验。数值模拟和试验结果高度吻合并一致表明：药厚10mm时,TA2/1060和1060/5083界面均呈优质平直状结合,药厚15mm时,1060/5083界面呈波状形貌结合,两种药厚条件下的钛-铝过渡界面均未检测到脆性金属间化合物缺陷生成;药厚20mm时,基复板材料发生破坏,不能实现复合。运用计算优化的参数成功制备了大面积TA2/1060/5083复合材料,本文为理化性能差异较大异种金属等爆炸复合问题提供了一种新的可靠算法。     

Experiment and interface of Ti/Q235B cladding plate by double vertical explosive welding*

The processing area is reduced by double vertical explosive welding and rolling.Those micro defects are avoided such as"fusion"and"jet pile"in the bonding zone of large Ti plate of explosive welding.So the quality and welding ratio of interface are improved.To solve the technical problem of narrow weldability window of Ti,a minimum critical detonation velocity explosive was invented to enlarge the window after double vertical explosive welding experiment and optimization.A comprehensive protective structure made up of rigid protective plates and flexible protective walls was designed to restrict the movement of cladding plates in double vertical explosive welding effectively and protect the cladding plates from damage.The interface microstructure showed that the bonding interfaces were periodically micro and small wavy and there are no micro defects such as melt metal and swirl.     

爆炸焊接布药工艺的研究

通过对均匀布药工艺下爆炸焊接荷载作用规律及复合板的界面波分布规律进行研究分析，进而提出了不等厚度布药的新工艺。试验研究表明：不等厚度布药工艺进一步提高了爆炸复合板的整体结合质量，再次大幅度减小了焊接装药量，降低了对周围环境的不利影响。