摘要
以4种金属单质镉、锌、钛和铬作为镁合金A-TIG焊的活性剂,分析了不同金属单质对焊缝形貌、电弧形态及电弧电压的影响.结果表明,与常规TIG焊相比,镉和锌活性剂均增加焊接熔深,钛活性剂对焊接熔深不起作用,铬活性剂反而减少焊接熔深;涂敷镉和锌时,焊接过程中电弧形态收缩,电弧电压增加;涂敷钛和铬对电弧形态和电弧电压基本没有影响.镉和锌活性剂增加镁合金A-TIG焊接熔深的主要机理可能是受二者熔沸点和第一电离能的影响,使得在交流电正半波期间电弧导电通道收缩.
Four kinds of metal cadmium,znic,titanium and chromium were used as the activating fluxes for the A-TIG welding of magnesium alloy and the influence of metal activating fluxes on the weld morphology,the arc shape and the arc voltage has been analyzed.The results indicated that compared with the conventional TIG welding,both znic flux and cadmium flux increased the weld penetration depth,while the chromium flux redcued it and the effect of Ti flux was negligible.It could also be observed that the arc concentrated and the arc voltage increased with both znic and cadmium fluxes,while the variations of the arc and the arc voltage with titanium and chromium fluxes were hardly be observed.The main mechanism that znic and cadmium activating fluxes enhance weld penetration for the A-TIG welding of magnesium alloy may be that these fluxes constrict the current-conducting channel of the arc during the positive period of alternating current,due to the effect of the melting point,the boiling point and the first ionization energy.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第9期37-40,115,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51004022)
辽宁省博士启动基金资助项目(20091010)
