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。     

高压换热器钛管-管板爆炸焊接模拟与试验

运用计算机数值模拟高压换热器钛管和管板爆炸焊接过程,并通过优化低猛度临界爆速炸药配方、选取最佳的爆炸焊接间隙、应用不稳定爆轰端控制技术等关键技术,使薄壁钛管一普通钢管板能成功实现爆炸焊接成型。此爆炸焊接成型可实现用常规焊接和胀管方法无法实现的锆、钛等稀有金属管材与钢等异形金属之间的焊接;换热器换热管与管板之间的焊接强度高,既保证了换热器的安全性,又大大提高了换热器的使用寿命;生产率高,可一次实现一台换热器所有管子与管板的焊接成型。     

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.     

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.     

基于Windows NT的微机实时高压测试系统的开发

随着机械自动化程度的提高,多数工程机械设备有着复杂的液压控制系统,液压系统的零部件众多,为了保证可靠的性能,出厂前需要经过严格的压力测试。传统的试压泵采用人工试压,精度低,效率低下,而且由于人工直接操作,在测试过程中容易造成安全事故。     

爆炸焊接不等厚度布药工艺

通过对均匀布药工艺下爆炸焊接复合板的界面波形进行理论分析,提出不等厚度布药的新工艺。并通过不等厚度布药试验和界面测试分析,与均匀布药下界面分析相比较,验证了理论分析的正确性。此工艺进一步提高了爆炸复合板的整体结合质量,同时再次降低了焊接装药量,减小了对周围环境的不利影响。     

加固计算机抗干扰防护技术研究

研究了车载式军用加固计算机电磁兼容性（EMC）设计中的防电磁辐射问题并进行了成功的屏蔽设计。测试结果表明，屏蔽效果达到了GJB151A－97对陆军（内部和外部）的要求。     

爆炸焊接结合界面测试分析

运用ＪＸＡ－８８００Ｍ超大型电子探针对焊接结合界面进行了测试分析，并由此把焊接介面重新划分成过渡结合和直接结合。     

金属粉末激光快速成形的工艺及材料成形性

对比了3类金属粉末激光快速成形工艺:选区激光烧结;选区激光重熔,或称选区激光熔覆;以及直接激光沉积,或称激光净成形.提出了其分类依据是金属粉末与激光的作用机制,以及由此导致的金属粉末激光成形机理.综述了上述3类激光快速成形工艺的成形原理、成形材料及工艺优劣,分析了"球化"效应、翘曲变形、以及裂纹等对金属粉末激光成形性的影响规律及相应解决措施.