钛-钢板爆炸焊接的影响因素及炸药配方

爆炸复合用炸药是影响爆炸焊接效果的最主要因素,不同的材料和工艺参数对炸药的爆速、比冲量和能量有不同的影响,其中炸药的密度直接影响复板斜碰撞基板的速度和角度。选用低合金高强度结构钢Q345B和工业纯钛TA2为实验材料,通过理论计算与实验研究,得到了一种较为适合钛-钢板爆炸焊接用的炸药配方,并对钛-钢爆炸焊接影响因素进行了探讨。     

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.     

双层爆炸复合中覆板最小可焊厚度的分析

为了研究双层爆炸焊接中覆板的最小可焊厚度,分析了爆炸焊接对于炸药布药量的要求,提出了一种利用爆炸焊接的碰撞速度下限与覆板的一维平板运动公式计算爆炸焊接中覆板最小可焊厚度的方法,并采用爆炸焊接中常用的3种炸药,分别对不锈钢-钢、铝-钢、钛-钢、铜-钢的爆炸焊接最小可焊厚度进行计算,计算得出4种覆板的最小可焊厚度分别在1....     

不同热处理制度对钛-钢复合板的影响

采用爆炸焊接方法制作大面积钛-钢复合板,在爆炸焊接完成后需进行热处理以消除爆炸焊接过程中产生的应力。本文研究了不同热处理制度对钛-钢复合板的影响,并确定了合适的钛-钢复合板热处理制度。     

双层爆炸复合中覆板最小可焊厚度的分析

为了研究双层爆炸焊接中覆板的最小可焊厚度,分析了爆炸焊接对于炸药布药量的要求,提出了一种利用爆炸焊接的碰撞速度下限与覆板的一维平板运动公式计算爆炸焊接中覆板最小可焊厚度的方法,并采用爆炸焊接中常用的3种炸药,分别对不锈钢-钢、铝-钢、钛-钢、铜-钢的爆炸焊接最小可焊厚度进行计算,计算得出4种覆板的最小可焊厚度分别在1.5、2.5、2.0、1.5 mm左右。同时指出在进行小厚度覆板的爆炸焊接时,由于密度更低的炸药爆轰压力也更低,可以更好地适用于小厚度覆板的爆炸焊接。     

爆炸焊接炸药中添加剂的应用比较

为解决爆炸焊接过程中,工业盐添加剂对植被影响及炸药爆炸产生的噪音、振动危害对周边环境的影响,在乳化炸药中添加碳酸钙来取代工业盐,以充当爆速及密度调节的作用。通过实验最终确定性能比较稳定的低爆速的混合炸药,该炸药可以降低噪音及爆破振动,适用于爆炸焊接,消除了工业盐对爆炸焊接场地周边环境的影响,增大爆炸焊接场地的生产能力,降低了生产成本,具有较好的推广应用前景。     

爆炸焊接炸药中添加剂的应用比较

为解决爆炸焊接过程中,工业盐添加剂对植被影响及炸药爆炸产生的噪音、振动危害对周边环境的影响,在乳化炸药中添加碳酸钙来取代工业盐,以充当爆速及密度调节的作用。通过实验最终确定性能比较稳定的低爆速的混合炸药,该炸药可以降低噪音及爆破振动,适用于爆炸焊接,消除了工业盐对爆炸焊接场地周边环境的影响,增大爆炸焊接场地的生产能力,降低了生产成本,具有较好的推广应用前景。     

钛/不锈钢的爆炸焊接及其界面的影响

土尔其学者研究了使用不同炸药量爆炸焊接的钛/不锈钢板的接合界面的冶金性能.     

爆炸焊接对炸药性能要求的探讨

为了保证爆炸焊接复合板达到良好的质量和能否在爆炸焊接中使用非理想爆轰炸药,对所使用的炸药性能进行了探讨。结合爆炸焊"窗口"理论以及工程实例对用于爆炸焊接的炸药爆速、密度、爆轰状态等参数进行计算,得到了爆炸焊接中炸药爆速的上、下限,密度的取值范围以及提高炸药能量利用率的途径,并在铝-钢焊接工程中取得了较好的效果,以期对爆炸焊接工作有所裨益。     

爆炸焊接技术的研究与应用进展

对爆炸焊接技术的研究与应用现状进行了综述,指出爆炸焊接机理研究、爆炸焊接专用炸药研究、爆炸焊接产品质量指标体系和检测方法研究、爆炸焊接数值模拟与仿真软件研究、爆炸焊接实验测试技术研究和爆炸焊接技术的应用研究是爆炸焊接有待进一步研究的问题,非晶态合金和具有耐高温、耐腐蚀、耐磨损、抗疲劳、高强度、高磁导率等特质的优质金属或合金的研制,以及超厚、超薄、超大、多样化材料(如脆性材料)的爆炸焊接是爆炸焊接技术的发展方向.     

Testing of explosive welding and welded joints. Wavy character of the process and joint quality

The basic defects occuring in explosive clad plates were properly systemized and the reasons of their formation were explained. Cases of cracks and delaminations in explosive clad plates were examined in this work. Various values of tensile stresses coming from loading and unloading waves were analysed, as they were the main reason of defects. The defects were connected with properties of welded materials in the joint area and beyond it. Some practical aspects of this process were shown as well.     

Fragment mass distribution of metal cased explosive charges

Fragmentation of metal casings is an important issue in a variety of problems like weapon effectiveness, safety distances or collateral damage. To be able to describe the intended or unintended effects of naturally fragmenting shells, one needs to know the mass distribution of the fragments produced after detonation of the explosive charge. In the present study the fragmentation behavior of very light and heavier casings has been investigated. The data collection method is outlined and applied to the fragment mass distribution of four different shells. The results are given in diagrams. It was found that an existing fragmentation model adequately predicts the dependence of circumferential fragment size on material strength. Fracture in axial direction should also be considered to predict correct fragment masses, but currently a suitable model for this purpose is not available.     

Effect of explosive characteristics on the explosive welding of stainless steel to carbon steel in cylindrical configuration

The aim of this research is to study the influence of explosive characteristics on the weld interfaces of stainless steel AISI 304L to low alloy steel 51CrV4 in a cylindrical configuration. The effect of ammonium nitrate-based emulsion, sensitized with different quantities and types of sensitizing agents (hollow glass microballoons or expanded polystyrene spheres) and Ammonium Nitrate Fuel Oil (ANFO) explosives on the interface characteristics is analyzed. Research showed that the type of explosive and the type and proportion of explosive sensitizers affect the main welding parameters, particularly collision point velocity. The morphology of the wavy weld interfaces, chiefly the amplitude and length of the waves, is affected both by the impact velocity and the type and particle size of the explosive sensitizers, and increases with particle size. All the weld interfaces, except welds done with ANFO, displayed localized melted and solidified regions, whose chemical composition resulted from the contribution of both flyer and base metal.     

Crack dynamics and explosive burn via generalized coordinates

The growth of cracks and their role in the formation of hot spots in explosives are addressed in a three-part discussion. First the method of generalized coordinates is used to represent crack dynamics with two ordinary differential equations for crack opening and growth. These account for both stable and unstable behavior. Second, the behavior of burning cracks is addressed by coupling those differential equations to a burn model to show that burning cracks can exhibit either mild or violently unstable behavior. Finally, in the third part, it is shown that the burning crack algorithm in combination with SCRAM (which deals with Statistical CRAck Mechanics) can account for the reactive behavior of a plastic-bonded explosive (PBX 9501) subjected to multiple shocks. SCRAM allows for representation of brittle behavior in a variety of explosives, propellants, ceramics and geological materials. This revised version was published online in June 2006 with corrections to the Cover Date.     

双金属复合板的新制备工艺——爆炸压涂

本文提出了一种制备双金属复合板的新工艺——爆炸压涂。爆炸压涂是利用炸药爆轰产生的高压驱动金属板高速撞击粉末,使粉末在得到压实的同时,牢固地附着在金属板表面形成双金属复合板的爆炸加工工艺。与现有制备工艺比较,爆炸压涂兼具了爆炸焊接和烧结复合的优点,能够制备出结合强度高,覆层性能好且具有微量孔隙的复合板。该工艺不需专用设备、工艺简单、生产成本较低。     

炸药性能与岩石匹配的试验研究

为了探究炸药和岩石的匹配关系,以寻求最优的匹配效果,最终将大块率控制在合理范围以内,创造良好的经济效益和社会效益。在江西德兴铜矿爆破施工中,采用岩块投影的最大面积和周长作为衡量矿岩块度的标准几何特征参量,并运用AutoCAD二次开发VB编程进行数据处理,采用回归分析法探讨炸药和岩石的匹配关系,最后得到最优匹配区的匹配系数为2.50².58。     

炸药性能与岩石匹配的试验研究

为了探究炸药和岩石的匹配关系,以寻求最优的匹配效果,最终将大块率控制在合理范围以内,创造良好的经济效益和社会效益。在江西德兴铜矿爆破施工中,采用岩块投影的最大面积和周长作为衡量矿岩块度的标准几何特征参量,并运用AutoCAD二次开发VB编程进行数据处理,采用回归分析法探讨炸药和岩石的匹配关系,最后得到最优匹配区的匹配系数为2.50~2.58。     

爆炸焊接用低爆速粉状乳化炸药研究

为降低岩石粉状乳化炸药的爆速,选择了一种HW矿物粉,通过筛混方式将该分散剂与炸药混合,并测定了该分散剂加入量和布药厚度对炸药爆速的影响。结果表明,岩石粉状乳化炸药中掺入44.5%⁵0%的HW矿物粉时,爆速为1913m/s50%的HW矿物粉时,爆速为1913m/s²378m/s,经钢与不锈钢板爆炸焊接试验表明,爆炸结合率达100%,可满足金属爆炸焊接用炸药的要求。     

爆炸焊接用低爆速粉状乳化炸药研究

为降低岩石粉状乳化炸药的爆速,选择了一种HW矿物粉,通过筛混方式将该分散剂与炸药混合,并测定了该分散剂加入量和布药厚度对炸药爆速的影响。结果表明,岩石粉状乳化炸药中掺入44.5%~50%的HW矿物粉时,爆速为1913m/s~2378m/s,经钢与不锈钢板爆炸焊接试验表明,爆炸结合率达100%,可满足金属爆炸焊接用炸药的要求。