大型宇航容器环缝的适应控制自动焊

介绍了一种大型宇航容器环向焊缝适应控制TIG自动焊接系统的设计方案。该方案采用交流变频调速驱动系统、双逆变交流矩形波焊接电源、矩形波交流电弧的弧长自动调节系统、可编程控制(PLC)为主控器的焊接程序控制系统等。并分析了在新的焊接条件下适应控制自动焊主要工艺参数对焊接质量的影响。     

星箭解锁系统超高真空解锁分离试验技术

介绍了星箭解锁系统在规定的超高真空和自身温度或温度循环及包带预紧力条件下解锁分离试验的目的、试验要求、试验技术和“风云一号”星箭解锁系统解锁分离试验的简单情况。     

TA15板与电子束焊接疲劳特性研究

通过对TA15钛合金薄板材料标准疲劳试件的疲劳试验结果分析处理和结构用板材2种应力水平下成组疲劳试验,建立了TA15板S-N曲线表达式.完成两种应力水平下TA15板电子束焊接试件疲劳试验,采用当量应力集中系数法,确定各试件的当量应力集中系数以及中值当量应力集中系数、安全当量应力集中系数.进而建立电子束焊接件的S-N曲线与p-S-N曲线,并对当量应力集中系数法的合理性进行了检验.最后对TA15板及电子束焊接件的疲劳特性做了对比分析.     

搅拌摩擦焊焊缝区温度分布及对材料流动的影响

对搅拌摩擦焊三维温度场分布情况进行了研究 ,用有限元方法计算了温度场分布 ,模拟结果与试验结果基本吻合。采用的热源模型考虑了输入的热量随温度和位置变化的情况 ,所得的结果能更准确描述搅拌头附近温度分布情况。搅拌头前端的高温区比后端的温度高温区小 ,促使焊接过程中前进边的材料逆着搅拌头旋转方向向后流动 ,返回边的材料沿着搅拌头旋转方向向后流动 ,二者在偏向前进边侧结合     

任意平面曲线的圆弧逼近方法

提出了一种根据给定精度逼近平面任意曲线的方法。该方法可以逼近任意次有理Ｂ样条曲线以及非均匀有理Ｂ样条曲线，尤其克服了双圆弧逼近方法的局限性实现了对封闭曲线的圆弧逼近。该方法独立于坐标系，独立于曲线类型。实际应用结果表明，它是一个适用于ＣＡＤ／ＣＡＭ集成系统任意平面曲线的圆弧逼近通用算法。本文对边界条件确定、误差修正和拐点处理进行了一定的研究，得出了一些价值性高、实用性强的结论，为数控加工任意平面曲线提供了一条简捷、易行、可靠的途径。     

表面粗糙度对铍青铜微电阻点焊接头性能的影响

通过改变铍青铜表面粗糙度,研究了表面粗糙度对微电阻点焊接头强度和焊点组织形貌的影响。结果表面:当表面粗糙度小于0.5μm时,接头拉剪载荷随着表面粗糙度的增大而增大;当表面粗糙度大于0.5μm时,焊接电流不同,表面粗糙度对接头拉剪载荷的影响不同。表面粗糙度的变化基本不对接头组织形貌产生影响。铍青铜微电阻点焊接头由焊核、焊核周围的热影响区以及由焊核向热影响区过渡的熔合区组成。     

推挂机驱动齿轮断裂浅析

对包果推挂机驱动具轮在运行过程中发生的齿根处破坏进行了宏观、微观和显微组织等方面的分析，并在原零件相应部位进行了口模拟验证试验，从而确定了零件断裂的原因。     

In situ dating on Mars: A new approach to the K–Ar method utilizing cosmogenic argon

Cosmogenic argon isotopes are produced in feldspars via nuclear reactions between cosmic rays and Ca and K atoms within the lattice. These cosmogenic isotopes can be used as proxies for K and Ca, much like nuclear reactor-derived ³⁹Ar and ³⁷Ar are used as proxies for K and Ca, respectively, in ⁴⁰Ar/³⁹Ar geochronology. If Ca and K are uniformly distributed, then the ratio of radiogenic ⁴⁰Ar (⁴⁰Ar^?) to cosmogenic ³⁸Ar or ³⁶Ar (³⁸Ar_cos or ³⁶Ar_cos) is proportional to the difference between the radioisotopic and exposure ages, as well as the K/Ca ratio of the degassing phase. Thus cosmogenic, radiogenic, and trapped Ar isotopes, all of which can be measured remotely and are stable over geologic time, are sufficient to generate an isochron-like diagram from which the isotopic composition of the trapped component may be inferred. Such data also provide a means to assess the extent to which the system has remained closed with respect to ⁴⁰Ar^?, thereby mitigating otherwise unquantifiable uncertainties that complicate the conventional K–Ar dating method.     

Microstructure and Property Analysis of AerMet100 Steel Manufactured by In-situ Rolling Mixed Wire Arc Additive Manufacturing

AerMet100 steel thick wall is fabricated by in-situ rolling composite wire arc additive manufacturing (WAAM). The microstructure and mechanical properties of AerMet100 steel after heat treatment are studied. The results show that after the introduction of in-situ rolling force， the grain of AerMet100 steel is broken， the anisotropy is eliminated， and the microstructure is refined obviously. The microstructure of AerMet100 steel after heat treatment is mainly lath martensite and reverse austenite. There are 40 nm?68.6 nm alloy carbides precipitated in the martensitic matrix， and the hardening mechanism is mainly Orowan bypass strengthening. The film-like reverse austenite with the thickness ranging from 2 nm to 5 nm exists between the martensitic lath， which improves the toughness of the maraging steel. Good combination of strength and toughness can be achieved through proper heat treatment process.     

影响铝合金焊接接头性能的若干因素

本文介绍了俄罗斯焊接学者关于影响铝合金焊接接头性能的若干因素的研究点滴。