钛制热管式换热器热管与管板连接工艺研究

Study on Connection Process between Heat Pipe and Tube Sheet of Titanium Heat Pipe Heat Exchanger

针对承受较大内外压差的钛制热管式换热器的热管与管板连接工艺难题,设计了一种接头连接,并制定了具体的工艺规范,先采用脉冲TIG焊焊接热管管壳与套管,然后进行单个热管制备,最后采用真空电子束焊接工艺焊接套管与管板间环对接缝。依据工艺制备了样件,对焊接头进行了外观、无损、低倍金相、拉脱力检测,对样件整体进行了水压试验考核。结果表明,样件各项检测及试验满足相关标准要求,研究结果为高性能钛制热管式换热器的研制奠定了关键工艺基础。

Aimed at the problem of heat pipe and tube sheet joining of the titanium heat pipe heat exchanger with large internal and external pressure difference,a transition sleeve is put between the heat pipe and tube sheet,and the specific process specification is formulated.Firstly,we adopt the pulse TIG welding to weld the heat pipe and sleeve,then manufacture single heat pipe,and finally use electron beam welding to weld the circumferential butt joint between the sleeve and tube sheet.The sample for the test is prepared according to the optimized process.The appearance,non-destructive,low magnification metallography,pull-off and hydrostatic test are carried out on the welded joint.Results show that all the testing results can meet relevant standards,which provides key technologies for the construction of heat exchanger of high quality titanium heat pipe.