CdTe晶体的电学特性

CdTe晶体可用于制造太阳能电池、粒子探测器,又是外延HgCdTe的良好衬底,因此对它的研究是很有意义的。本文简要叙述了我们对CdTe晶体所做的电学特性测量及结果,它们在一定程度上反映了CdTe晶体的质量。实验所用的晶片来自五个晶锭。它们都是刚刚生长好的P型材料,未曾进行过特殊热     

塑性变形对SUS301L点焊接头组织及性能的影响

用扫描电镜、X射线衍射仪及显微硬度计测试等方法研究了SUS301L电阻点焊接头的组织以及静拉伸变形对组织和性能的影响.结果表明,点焊熔核组织由奥氏体及δ铁素体组成,拉伸变形会诱发点焊接头的奥氏体产生马氏体相变,相变使得点焊拉伸曲线的硬化率始终保持在较高水平.     

用红外吸收的光调制技术测量Hg_(1-x)Cd_xTe的载流子寿命

用红外吸收的光调制技术在90-330K温度范围内测量了组分0.24     

Numerical simulation on temperature field for resistance spot welding of non-equal thickness stainless steel

An axisymmetrie finite element model is developed to simulate the temperature field of resistant spot welding according to the process characters of nugget formation of non-equal stainless steel sheets. A simulation method of the interaction of electrical and thermal factors is presented. The spot welding process of nugget formatian is simulated using hard and soft welding technique norms. The heating characters of soft and hard norms determine the differences in the process of nugget formation and determine the finally shape and offset of nugget. Experimental verification shoics that the model prediction agrees well with the practical.     

CO2气体保护焊在209焊接构架上的应用

本文主要介绍了 CO_2气体保护焊在铁路客车209转向架焊接结构架上的具体应用。通过采取一系列措施,使焊接构架取代铸钢构架,并在批量生产中代替了手工电弧焊,提高了生产效率。经过5年多的实际应用证明,209焊接构架的焊缝质量完全能满足铁路客车运行的要求。     

基于CAPP的模具报价系统的开发

在模具价格构成的基础上,结合模具行业的实际情况,建立了对模具价格进行预算的计算机模型。在三维CAD产品信息模型支持下,利用CAPP技术,确定模具零件的加工工艺过程,给出了分析价格成本预算的方法和模具报价系统的构成。     

三层不锈钢板电阻点焊温度场数值模拟

根据三层不锈钢板电阻点焊熔核形成过程,建立了模拟三层板点焊温度场的轴对称有限元模型。在分析了三层板点焊的热电过程基础上,计算结果表明三层板点焊熔核初期是先形成包含中间板和上下工件/工件接触面的较小的熔核,随时间延长,熔核再沿轴向和径向逐渐长大的过程。通过试验验证表明,数值模拟结果与实际吻合良好。该模型为进一步的电阻点焊多层板的温度场和应力场分析提供了基础。     

Electrical-thermal interaction simulation for resistance spot welding nugget process of mild steel and stainless steel

A three-dimensional finite difference electrical-thermal model for resistance spot welding nugget process of mild steel and stainless steel is introduced. A simulation method of the interaction of electrical and thermal factors is presented. Meanwhile, calculation method of contact resistance and treatment method of heater structure is provided. The influence of the temperature dependent material properties and various cooling boundary conditions on welding process was also taken intoaccount in the model. A method for improving the mild steel and stainless steel joint was analyzed in numerical simulation process. Experimental verification shows that the model prediction agrees well with the practice. The model provides a usefultheoretic tool for the analysis of the process of resistance spot welding of mild steel and stainless steel.     

装饰工程施工管理与质量控制监督

通过现场施工管理、工程质量控制监督这两方面来谈谈装饰工程的施工。     

薄壁椭圆容器组焊夹具的应用

本文主要介绍薄壁椭圆容量的组焊夹具及其在我厂椭圆水箱上的应用。此组焊夹具的使用，为薄壁椭圆容器的批量生产，在质量和效率上提供了保证。这一组焊夹具对其它行业薄壁椭圆容器的生产，具有推广应用的价值。