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首页> 外文期刊>DVS-Berichte >Hybrid friction diffusion bonding for tube-to-tube sheet welds - Process principles and joint properties of a novel solid state joining method
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Hybrid friction diffusion bonding for tube-to-tube sheet welds - Process principles and joint properties of a novel solid state joining method

机译：管对管薄板焊缝的混合摩擦扩散焊接-新型固态焊接方法的工艺原理和接头性能

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摘要

Hybrid Friction Diffusion Bonding (HFDB) is a novel solid state joining process, which allows to bond sheets or tubes to a substrate without melting the workpieces. Bonding is achieved by frictional heating, plastic deformation and diffusion across the components' interface, induced by a non-consumable rotating tool, through which a defined force is applied onto the joining partners. HFDB was primarily developed for the joining of thin sheets, but a variation of the process is employed for the joining of tube to tube sheets in Aluminium coil wound heat exchangers (CWHE). In the work at hand, the CWHE HFDB process parameters were varied in order to define a process window within which high quality joints are obtained. Gas leak tightness tests and pull out tensile tests were carried out, in addition to microstructural analysis of the joined 5000 series Aluminium alloys. All joined samples passed leak tightness tests. Tensile properties above 80% of the base material strength were reached and ductile fractures occurred in the heat affected (HAZ) zone within the tubes. The results demonstrate that the HFDB process is robust and reproducible and has the potential to replace conventional fusion welding methods in the manufacturing of Aluminium coild wound heat exchangers as a faster and automatable process.
机译：混合摩擦扩散键合（HFDB）是一种新颖的固态连接工艺，该工艺允许将板材或管材粘结到基材上而不会熔化工件。通过非消耗性旋转工具引起的摩擦加热，塑性变形以及在组件界面上的扩散来实现粘合，通过旋转工具将限定的力施加到连接对象上。 HFDB最初是为连接薄板而开发的，但是在铝卷绕制热交换器（CWHE）中，采用了一种工艺上的变化将管对板连接在一起。在手头的工作中，改变了CWHE HFDB工艺参数，以定义一个工艺窗口，在该窗口内可获得高质量的接头。除了对接合的5000系列铝合金进行显微组织分析外，还进行了气密性测试和拉拔拉伸测试。所有加入的样品均通过了密封性测试。达到超过基材强度80％的拉伸性能，并且在管内的热影响（HAZ）区域中发生了韧性断裂。结果表明，HFDB工艺可靠且可重现，并有望取代铝制缠绕式换热器制造中的常规熔焊方法，从而成为一种更快且可自动化的工艺。

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