洪淼等：焊接电流对镁/镀锌钢TG熔一钎焊接头显微组织与力学性能的影响 ·985· 焊缝内的第二相过于粗大，脆性的第二相能减弱接头 TIG welding.Mater Des,2010,31(1)605 强度.过大的热输入量还可能造成镁合金板的大量烧 7]Miao Y G,Han D F,Yao J Z,et al.Welding characteristics of 损及挥发，使得焊缝变薄，从而降低接头强度.接头强 laser penetration welding-brazed Mg/steel dissimilar alloys.Trans China Weld Inst,2011,30(1):45 度在电流大小为70A时达到最高值227.0N·mm,接 (苗玉刚，韩端锋，姚竞争，等.镁/钢异种合金激光深熔钎焊 近AZ31B镁合金母材强度的88.7%. 工艺特性.焊接学报，2011,32(1)：45) (4)焊接电流过小时，接头在拉伸过程中会从镁/ [8]Elthalabawy W M,Khan T I.Microstructural development of dif- 钢界面断开，断面上有大量明显的孔洞和缝隙：焊接电 fusion-brazed austenitic stainless steel to magnesium alloy using a 流为70A时接头在拉伸过程中从焊缝的熔焊区断开， nickel interlayer.Mater Charact,2010,61 (7):703 断面出现大量韧窝和撕裂棱，呈现出良好的塑性断裂 9]Elthalabawy W,Khan T I.Diffusion bonding of austenitic stain- 特征：电流强度过大时，断面出现由焊缝内部的第二相 less steel 316L to a magnesium alloy.Key Eng Mater,2010,442: 26 脱离时残留下来的孔洞 [1o]Jana S,Hovanski Y,Grant G J.Friction stir lap welding of mag- nesium alloy to steel:a preliminary investigation.Metall Mater 参考文献 Trans A,2010,41(12):3173 [1]Mei C X.Research on Laser Welding-Brazing Characteristics of Mg [11]Li L Q,Guo W,Tan C W.Welding characteristics of AZ31B Alloy/Galranized Steel Dissimilar Materials [Dissertation].Har- magnesium alloy/stainless steel dissimilar alloys by dual beam la- bin:Harbin Institute of Technology,2011:1 ser welding-brazing process.Chin Laser,2012,39(4):66 (梅长兴.镁合金/镀锌钢异种材料激光熔钎焊特性研究[学 (李俐群，郭伟，檀财旺.AZ31B镁合金/不锈钢异种合金双 位论文].哈尔滨：哈尔滨工业大学，2011：1) 光束激光熔钎焊接特性.中国激光，2012,39(4)：66) 2]Cao H.Study on the Laser-TIG-Adhesive Hybrid Welding of Dis- 02] Lei Z,Qin G L,Lin S Y,et al.Research and development of similar Magnesium Alloy and Steel Dissertation].Dalian:Dalian dissimilar metals welding of aluminum and steel.Weld Joining University of Technology,2013:I 2006(4):16 (曹贺.镁一钢异质金属激光-TG电弧复合热源胶焊研究[学 (雷振，秦国梁，林尚扬，等.铝与钢异种金属焊接的研究与 位论文].大连：大连理工大学，2013：I) 发展概况.焊接，2006(4)：16) B]Tan C.W,Mei C X,Li L Q,et al.Single and dual beam laser [13]Liu L M,Wang S X,Zhu M L.Study on TIG welding of dissimi- welding-brazing characteristics of magnesium/zinc-coated steel dis- lar Mg alloy and copper with Fe as interlayer.Sci Technol Weld similar alloys.Chin J Nonferrous Met,2012,22(6):1577 Joining,2006,11(5):523 (檀财旺，梅长兴，李俐群，等.镁/镀锌钢异种合金单、双光 [14]Li L Q,Tan C W,Chen Y B,et al.Influence of Zn coating on 束激光熔钎焊特性.中国有色金属学报，2012,22(6)： interfacial reactions and mechanical properties during laser weld- 1577) ing-brazing of Mg to steel.Metall Mater Trans A,2012,43 [4]Pierre D,Viala JC,Peronnet M,et al.Interface reactions be- (12):4740 tween mild steel and liquid Mg/Mn alloys.Mater Sci Eng A, [15]Liu L,Xiao L,Feng J C,et al.The mechanisms of resistance 2003,349(12):256 spot welding of magnesium to steel.Metall Mater Trans A,2010, [5]Chen Y C,Nakata K.Effect of tool geometry on microstructure 41(10):2651 and mechanical properties of friction stir lap welded magnesium al- [16]Li L Q,Tan C W,Chen Y B,et al.Comparative study on mi- loy and steel.Mater Des,2009,30(9):3913 crostructure and mechanical properties of laser welded-brazed [6]Qi X D,Song G.Interfacial structure of the joints between magne- Mg/mild steel and Mg/stainless steel joints.Mater Des,2013, sium alloy and mild steel with nickel as interlayer by hybrid laser 43:59洪 淼等: 焊接电流对镁/镀锌钢 TIG 熔--钎焊接头显微组织与力学性能的影响 焊缝内的第二相过于粗大，脆性的第二相能减弱接头 强度． 过大的热输入量还可能造成镁合金板的大量烧 损及挥发，使得焊缝变薄，从而降低接头强度． 接头强 度在电流大小为 70 A 时达到最高值 227. 0 N·mm － 1，接 近 AZ31B 镁合金母材强度的 88. 7% ． ( 4) 焊接电流过小时，接头在拉伸过程中会从镁/ 钢界面断开，断面上有大量明显的孔洞和缝隙; 焊接电 流为 70 A 时接头在拉伸过程中从焊缝的熔焊区断开， 断面出现大量韧窝和撕裂棱，呈现出良好的塑性断裂 特征; 电流强度过大时，断面出现由焊缝内部的第二相 脱离时残留下来的孔洞． 参 考 文 献 ［1］ Mei C X． Ｒesearch on Laser Welding--Brazing Characteristics of Mg Alloy /Galvanized Steel Dissimilar Materials ［Dissertation］． Har￾bin: Harbin Institute of Technology，2011: 1 ( 梅长兴． 镁合金/镀锌钢异种材料激光熔钎焊特性研究［学 位论文］． 哈尔滨: 哈尔滨工业大学，2011: 1) ［2］ Cao H． Study on the Laser--TIG--Adhesive Hybrid Welding of Dis￾similar Magnesium Alloy and Steel［Dissertation］． Dalian: Dalian University of Technology，2013: Ⅰ ( 曹贺． 镁--钢异质金属激光--TIG 电弧复合热源胶焊研究［学 位论文］． 大连: 大连理工大学，2013: Ⅰ) ［3］ Tan C W，Mei C X，Li L Q，et al． Single and dual beam laser welding-brazing characteristics of magnesium / zinc-coated steel dis￾similar alloys． Chin J Nonferrous Met，2012，22( 6) : 1577 ( 檀财旺，梅长兴，李俐群，等． 镁/镀锌钢异种合金单、双光 束激光 熔 钎 焊 特 性． 中 国 有 色 金 属 学 报，2012，22 ( 6 ) : 1577) ［4］ Pierre D，Viala J C，Peronnet M，et al． Interface reactions be￾tween mild steel and liquid Mg /Mn alloys． Mater Sci Eng A， 2003，349( 1-2) : 256 ［5］ Chen Y C，Nakata K． Effect of tool geometry on microstructure and mechanical properties of friction stir lap welded magnesium al￾loy and steel． Mater Des，2009，30( 9) : 3913 ［6］ Qi X D，Song G． Interfacial structure of the joints between magne￾sium alloy and mild steel with nickel as interlayer by hybrid laser TIG welding． Mater Des，2010，31( 1) : 605 ［7］ Miao Y G，Han D F，Yao J Z，et al． Welding characteristics of laser penetration welding-brazed Mg / steel dissimilar alloys． Trans China Weld Inst，2011，30( 1) : 45 ( 苗玉刚，韩端锋，姚竞争，等． 镁/钢异种合金激光深熔钎焊 工艺特性． 焊接学报，2011，32( 1) : 45) ［8］ Elthalabawy W M，Khan T I． Microstructural development of dif￾fusion-brazed austenitic stainless steel to magnesium alloy using a nickel interlayer． Mater Charact，2010，61( 7) : 703 ［9］ Elthalabawy W，Khan T I． Diffusion bonding of austenitic stain￾less steel 316L to a magnesium alloy． Key Eng Mater，2010，442: 26 ［10］ Jana S，Hovanski Y，Grant G J． Friction stir lap welding of mag￾nesium alloy to steel: a preliminary investigation． Metall Mater Trans A，2010，41( 12) : 3173 ［11］ Li L Q，Guo W，Tan C W． Welding characteristics of AZ31B magnesium alloy / stainless steel dissimilar alloys by dual beam la￾ser welding--brazing process． Chin J Laser，2012，39( 4) : 66 ( 李俐群，郭伟，檀财旺． AZ31B 镁合金/不锈钢异种合金双 光束激光熔钎焊接特性． 中国激光，2012，39( 4) : 66) ［12］ Lei Z，Qin G L，Lin S Y，et al． Ｒesearch and development of dissimilar metals welding of aluminum and steel． Weld Joining， 2006( 4) : 16 ( 雷振，秦国梁，林尚扬，等． 铝与钢异种金属焊接的研究与 发展概况． 焊接，2006( 4) : 16) ［13］ Liu L M，Wang S X，Zhu M L． Study on TIG welding of dissimi￾lar Mg alloy and copper with Fe as interlayer． Sci Technol Weld Joining，2006，11( 5) : 523 ［14］ Li L Q，Tan C W，Chen Y B，et al． Influence of Zn coating on interfacial reactions and mechanical properties during laser weld￾ing-brazing of Mg to steel． Metall Mater Trans A，2012，43 ( 12) : 4740 ［15］ Liu L，Xiao L，Feng J C，et al． The mechanisms of resistance spot welding of magnesium to steel． Metall Mater Trans A，2010， 41( 10) : 2651 ［16］ Li L Q，Tan C W，Chen Y B，et al． Comparative study on mi￾crostructure and mechanical properties of laser welded-brazed Mg /mild steel and Mg / stainless steel joints． Mater Des，2013， 43: 59 · 589 ·