排序方式: 共有13条查询结果,搜索用时 15 毫秒
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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 相似文献
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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 相似文献
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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. 相似文献
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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。 相似文献
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Electrical-thermal interaction simulation for resistance spot welding nugget process of mild steel and stainless steel 总被引:1,自引:0,他引:1
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. 相似文献
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