采用冷金属过渡(CMT)焊对异种金属T2和1060Al进行焊接,选用S301、ER4043、ER4047 3种焊丝作为填充材料,研究在适当工艺参数下,焊丝成分对焊接接头组织、相组成、界面化合物形态及硬度的影响.结果表明:3种焊丝焊接的接头均由焊缝区、结合区、熔合区组成,且靠Cu侧的焊缝结合区均生成了较厚的界面化合物层.结合区的组织主要为(α-Al+ CuAl2)共晶和CuAl2金属间化合物相,当采用含Si量12.0％的ER4047焊接时结合区还析出了块状Si.焊丝中添加Si元素,抑制了靠Cu侧焊缝区界面化合物生长,并改变了化合物形态.同时,界面化合物生成,也导致3种焊缝均在靠Cu侧出现显微硬度的高峰区.
Cold metal transfer (CMT) welding was employed to weld the dissimilar metallic sheets of T2 and 1060 aluminum.S301,ER4043 and ER4047 welding wires were used as filler materials,respectively.The effects of composition of Al-Si welding wires on the characteristics of Cu-Al welded joints obtained by using suitable CMT welding parameters were studied.The results show that the three welded joints are composed of weld zone,bonding zone,fusion zone,and the thick interface compounds are generated at the bonding zone near the copper sheets.The microstructure of the three bonding zones is mainly (α-Al + CuAl2) eutectic and CuAl2 intermetallics.Moreover,the massive Si phases are found at the bonding zones of the welded joint that produced by using ER4047 welding wire with 12.0％ Si.These results indicate that Si element in the welding wires can restrain the growth of the interface compounds in the weld near the copper sheet,and the morphology of the compounds also can be changed by Si element as changing their contents in welding wires.The microhardness peak zones are formed in the copper side of the joint interface because of these interface compounds.
参考文献
| [1] | M. Abbasi;A. Karimi Taheri;M.T. Salehi.Growth rate of intermetallic compounds in Al/Cu bimetal produced by cold roll welding process[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20011/2(1/2):233-241. |
| [2] | Growth behavior of Cu/Al intermetallic compounds and cracks in copper ball bonds during isothermal aging[J].Microelectronics and reliability,20083(3):416. |
| [3] | Zhang, HT;Feng, JC;He, P;Zhang, BB;Chen, JM;Wang, L.The arc characteristics and metal transfer behaviour of cold metal transfer and its use in joining aluminium to zinc-coated steel[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,20091/2(1/2):111-113. |
| [4] | Cao, R.;Wen, B.F.;Chen, J.H.;Wang, P.-C..Cold Metal Transfer joining of magnesium AZ31B-to-aluminum A6061-T6[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2013:256-266. |
| [5] | Jing Shang;Kehong Wang;Qi Zhou;Deku Zhang;Jun Huang;Guangle Li.Microstructure characteristics and mechanical properties of cold metal transfer welding Mg/Al dissimilar metals[J].Materials & design,2012Feb.(Feb.):559-565. |
| [6] | Lin Sanbao;Fan Chenglei;Song Jianling;Yang Chunli.Research on CMT welding of nickel-based alloy with stainless steel[J].中国焊接,2007(03):23-26. |
| [7] | R. Cao;J. H. Sun;J. H. Chen.Mechanisms of joining aluminium A6061-T6 and titanium Ti–6Al–4V alloys by cold metal transfer technology[J].Science and Technology of Welding and Joining,20135(5):425-433. |
| [8] | R. Cao;Z. Feng;Q. Lin;J.H. Chen.Study on cold metal transfer welding-brazing of titanium to copper[J].Materials & design,2014Apr.(Apr.):165-173. |
| [9] | 陈剑虹;余建永;曹睿;王培中.镁合金焊丝成分对镁钢异种金属CMT焊接性的影响[J].兰州理工大学学报,2012(6):10-15. |
| [10] | 刘英才;张玉明;荣鼎慧;赵越;尹衍升;左铁军.薄壁铜铝管电阻焊焊接界面的微观结构研究[J].兵器材料科学与工程,2009(3):24-27. |
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