爆炸焊接理论与技术新进展

爆炸焊接理论与技术取得了四个方面的进展:(1)发现并重新定义了三种结合界面:大波状、小波状和微波状,其中以微波状为最佳.首次发现在一个复合板中,界面波呈一定的规律分布.(2)针对爆炸焊接熔焊机理的局限性,首次提出并验证了"爆炸焊接是一种特殊压力焊"的新观点.(3)为了得到无熔化的良好界面,必须选取焊接下限,按照新的复板模型,得到了新的焊接下限,比传统下限小20%,并适宜于工程应用.(4)首次测试并研究了爆炸焊接荷载下地基的应力应变规律.通过地基参数的优化分析,得到了最适宜于爆炸焊接的沙土地基(含水量17.00%、密度1.74g/cm3).

New Achievements on the Theory And Technology of Explosive Welding

There are four new achievements on the theory and techno1ogy of exp1osive welding.(1)We have found and defined three kinds of bonding interfaces:big wavy,small wavy and micro wavy,and the micro wavy interface is the best,in a cladding plate,it is for the first time to find that the form of interface presents regular distribution.(2)Although the interface has the features of melt,diffusion and pressure welding in the mean time,the seam and "hole" brought by the melt weaken the bonding strength of interface greatly,and the effect of melt on interface must be eliminated in explosive welding,so explosive welding is not a melt weld.The diffusion welding is a kind of form of pressure welding,and the diffusion is not the reason of the bonding of interface but the result of interface high pressure.So the diffusion welding cannot explain the bonding mechanism of it too.The experiment and theory make clear that explosive welding is a special pressure one.(3)To get a good interface with no melt,explosive charge must be selected on the low limit of welding windows.In explosive welding,the drive plate should be treated as the viscous and plastoelastic body,not incompressible fluid.The bending moment under the explosive welding loading must be greater than that under dynamic limit of driver plate.According to the condition,the lower limit of explosive welding is obtained.It is about 20% less than that obtained by traditional calculation,and suitable for engineering application.(4)It is for the first time to test and study soil anvil characteristics and change regularity under explosive welding impact loading,Through soil anvil parameter optimization analysis,it is the best for explosive welding with sandy soil of water content 17.00% and density 1.74g/cm3.