针对双钨极单热丝自动TIG工艺原理和技术优越性进行探索,采用双钨极单热丝自动TIG工艺在SA-508 Grade 3 Class 1锻件管板上进行镍基合金堆焊,并对堆焊层的各项性能进行试验研究,验证该方法在管板堆焊技术中应用的可行性.通过对焊接工艺参数的优化,该工艺方法在核电产品及管壳式换热器类设备制造中进行推广应用,熔敷效率可达到2.5～6 kg/h,工艺熔敷效率约为普通单热丝自动TIG的3倍,可在有效保证核电产品管板镍基堆焊层质量的前提下,缩短核电产品的制造周期.
Research and application of double tungsten automatic TIG for tubesheet cladding nickel base alloy
In order to explore the principle and technical advantages of double tungsten automatic-TIG welding technology process,cladding nickel base alloy on SA-508 Grade 3 Class 1 forging tubesheet using double tungsten automatic-TIG welding process,and the properties of nickel base alloy cladding were tested and studied,which verified the feasibility of the application of this method in tubesheet cladding technology.Through the optimization of welding process parameters,this process method has been promoted and applied in the manufacturing of nuclear power steam generators and shell-and-tube heat exchangers.The deposition efficiency of double tungsten automatic-TIG welding can reach 2.5～6 kg/h,which is about three times that of ordinary single hot wire automatic TIG.Under the premise of effectively ensuring the cladding quality of nickel base cladding of tubesheet,the manufacturing cycle of nuclear power products can be shortened.
nuclear steam generatortubesheetnickel base alloyoverlaying weldinggas tungsten arc welding
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