齿轮类零件电子束焊接结构的合理性分析

综述了齿轮类传动零部件采用电子束焊接加工的优越性，指出零件在不同结构尺寸、不同使用环境以及不同工艺状态下应选用与电子束焊接工艺相适应的焊缝结构，并对不同零件的焊缝接头结构形式的合理性进行了深入分析。     

基于数据挖掘的焊接生产管理平台

焊接生产规模不断向自动化和流水线方式发展 ,对生产管理水平提出了更高的要求。为了从车间已积累的大量的生产历史数据中获得潜在的规律性和趋势 ,为管理者提供决策支持 ,文中在已有的质量在线监测平台和数据库系统上开发了基于先进的数据挖掘技术的焊接生产管理平台 ,同时为了获得有效的挖掘模式 ,对数据进行了预处理 ,建立了焊接车间数据集市。该平台主要使用控制图控制焊接生产产量和废品数量 ;利用决策树方法分析废品产生因素 ,获得了有效的挖掘模型 ,对于指导焊接生产具有重要意义     

Material flow and microstructure in the friction stir butt welds of the same and dissimilar aluminum alloys

The material flow and microstructural evolution in the friction stir welds of a 6061-Al alloy to itself and of a 6061-Al alloy to 2024-Al alloy plates of 12.7 mm in thickness were studied under different welding conditions. The results showed that plastic deformation, flow, and mechanical mixing of the material exhibit distinct asymmetry characteristics at both sides of the same and dissimilar welds. The microstructure in dissimilar 6061-Al/2024-Al welds is significantly different from that in the welds of a 6061-Al alloy to itself. Vortex-like structures featured by the concentric flow lines for a weld of 6061-Al alloy to itself, and alternative lamellae with different alloy constituents for a weld of 6061-Al to 2024-Al alloy, are attributed to the stirring action of the threaded tool, in situ extrusion, and traverse motion along the welding direction. The mutual mixing in the dissimilar metal welds is intimate and far from complete. However, the bonding between the two Al-alloys is clearly complete. Three different regions in the nugget zone of dissimilar 6061-Al/2024-Al welds are classified by the mechanically mixed region (MMR) characterized by the relatively dispersed particles of different alloy constituents, the stirring-induced plastic flow region (SPFR) consisting of alternative vortex-like lamellae of the two Al-alloys, and the unmixed region (UMR) consisting of fine equiaxed grains of the 6061-Al alloy. Within all of these three regions, the material is able to withstand a very high degree of plastic deformation due to the presence of dynamic recovery or recrystallization of the microstructure. The degree of material mixing, the thickness of the deformed Al-alloy lamellae, and the material flow patterns depend on the related positions in the nugget zone and the processing parameters. Distinct fluctuations of hardness are found to correspond to the microstructural changes throughout the nugget zone of dissimilar welds.     

绝缘门极双极性晶体管（IGBT）在焊接逆变器中的应用

本文介绍绝缘门极双极性晶体管(IGBT)的基本结构、工作原理、开关特性以及在焊接逆变器中的应用。     

Ni－Fe－Cr－B－Si涂层超塑扩散焊接的强化效应及耐磨性

研究了Ｎｉ－Ｆｅ－Ｃｒ－Ｂ－Ｓｉ合金涂层超塑性扩散焊接及焊接后的强化效应。通过对涂层的组织结构分析、硬度及耐磨性能的测试表明，当基材（５ＣｒＭｎＭｏ钢）与涂层产生协调超塑变形时，涂层原颗粒间、涂层与基材结合界面完全焊合。超塑焊合后的涂层比高频重熔及火焰重熔涂层硬度（ＨＶ）提高１００－１５０，耐摩擦磨损性能提高３０％。指出，沉淀强化、细晶强化及晶内位错密度增加是引起涂层强化效应和提高耐磨性的主要因素。     

焊缝跟踪技术的研究与展望

本文回顾了电弧焊接的焊缝跟踪技术，并重点对该技术的发展趋势进行了介绍与分析，     

CO2气体保护的激光焊接12mm厚低碳钢板

采用CO2 作为保护气体消除大熔深激光焊接低碳钢时易发生的气孔问题 ,并对比研究了CO2 和Ar气保护条件下 12mm厚低碳钢板激光焊缝的组织和韧性。焊接试验利用 4kWNd :YAG激光器 ,采用双面深熔焊的方法 ,焊接条件为 4kW激光功率和0 .3 ,0 .5m/min的焊接速度。冲击试验采用一种自行设计的带侧面缺口的三缺口冲击试样 ,以保证断裂全部发生在焊缝。结果表明 ,利用CO2 作保护气体焊接低碳钢板 ,可以有效消除大熔深激光焊接时的气孔问题 ,并获得比Ar气保护下硬度较低 ,冲击韧性高的焊缝。研究工作为解决大功率激光深熔焊时容易发生的气孔问题提供了一条有效途径     

压力容器缺陷检测及补焊修复

本文对不同种类、结构、工作条件、制造质量压力容器的缺陷检测处理和现场补焊修复的原则和工艺作了详细的叙述。