(大連理工大學(xué) 三束材料表面改性國家重點實驗室， 大連 116024)
摘 要: 在不同的電流條件下， 研究了9種常見氧化物、 氟化物、 氯化物活性劑在鎂合金交流氬弧焊及變極性等離子焊弧中的行為。結(jié)果表明： 活性劑TiO2、 Cr2O3、 AlF3、 NiCl2、 CdCl2、 ZnCl2、 MgCl2使鎂合金交流氬弧焊焊縫熔深增加； MgF2、 SiO2使鎂合金交流氬弧焊焊縫熔深減小； TiO2、 SiO2、 Cr2O3、 AlF3、 NiCl2、 CdCl2使鎂合金變極性等離子弧焊焊縫熔深增加； MgF2、 ZnCl2、 MgCl2使鎂合金變極性等離子弧焊焊縫熔深減小；活性劑對鎂合金交流氬弧焊焊縫熔深增加的作用大于對鎂合金變極性等離子弧焊的； 電弧收縮是活性劑使得鎂合金電弧焊焊縫熔深增加的原因之一； 活性劑的加入使得焊縫的晶粒比未涂敷活性劑時粗大。
關(guān)鍵字: 鎂合金； 活性焊接； 交流氬弧焊； 變極性等離子弧焊
magnesium alloy
（ State Key Laboratory of Material Surface Modification by Laser, Ion and Electronic Beams, Dalian University of Technology, Dalian 116024, China）
Abstract: The behavior of nine kinds of familiar fluxes including oxide, chloride, fluoride in the AC-TIG and variable polarity plasma arc(VPPA) welding of magnesium were studied under the condition of different welding currents and arc stiffness. The results show that in the magnesium AC-TIG welding, the fluxes as TiO2, Cr2O3, AlF3, NiCl2, CdCl2, ZnCl2, MgCl2 all increase weld penetration, MgF2, SiO2 fluxes reduce the weld penetration, while in the VPPA welding, TiO2, SiO2, Cr2O3, AlF3, NiCl2, CdCl2 fluxes increase the weld penetration, MgF2, ZnCl2, MgCl2 fluxes reduce the weld penetration. However, the increase of weld penetration is not obvious for VPPA welding comparing with AC-TIG welding. Besides, the contraction of the arc is one of the reasons increasing the weld penetration, and the crystal grain size of the weld with flux is bigger than that without flux.
Key words: magnesium alloy; activating flux weld; AC-TIG welding; variable polarity plasma arc welding
