Microstructure and Tensile Properties of Advanced Cold Metal Transfer Welded Joint of 5A06 Aluminum Alloy Ultrathin Plates
摘 要
采用交流冷金属过渡焊接方法对0.8 mm厚5A06铝合金超薄板进行了焊接试验,研究了焊接接头的成形质量、显微组织及拉伸性能等。结果表明:在正面保护气体流量为20 L·min-1,背面保护气体流量为5 L·min-1,焊接电流为75~80 A,焊接速度为1 000 mm·min-1条件下,焊缝成形良好,连续美观,无气孔、裂纹、夹杂等缺陷;接头母材区组织为轧制态拉长α-Al相以及晶界处分布的弥散强化相,熔合线、热影响区、焊缝处均为等轴晶;接头拉伸时均在母材处断裂,抗拉强度达到360 MPa左右,断后伸长率约为12%,拉伸性能优良;断口存在大量韧窝,接头发生韧性断裂。
Abstract
Aluminum alloy 5A06 ultrathin plates with thickness of 0.8 mm were welded by advanced cold metal transfer welding process, and the forming quality, microstructure and tensile properties of the welded joint were studied. The results show that the weld was well formed, continuous and beautiful, without defects such as porosity, crack and inclusion when the front shielding gas flow rate was 20 L·min-1, the back shielding gas flow rate was 5 L·min-1, the welding current was 75-80 A, and the welding speed was 1 000 mm·min-1. The microstructure of the base metal of the joint was composed of rolled elongated α-Al phase and dispersion strengthening phase distributed at the grain boundary; the microstructure of fusion line, heat affected zone and weld was equiaxed grains. The joints fractured at the base metal after tension. The tensile strength was about 360 MPa, and the elongation percentage after fracture was about 12%, indicating the joint had excellent tensile properties. There were a lot of dimples in the fracture, and ductile fracture occurred in the joint.
中图分类号 TG444.74 DOI 10.11973/jxgccl202111008
所属栏目 材料性能及应用
基金项目 上海市学术技术带头人科技计划项目(21XD1431800);上海人才发展资金资助项目(2020038)
收稿日期 2020/9/10
修改稿日期 2021/8/20
网络出版日期
作者单位点击查看
备注赵慧慧(1984-),女,辽宁丹东人,研究员,博士
引用该论文: ZHAO Huihui,JIA Hongde,HU Lan,LI Ying,ZHOU Jiafen. Microstructure and Tensile Properties of Advanced Cold Metal Transfer Welded Joint of 5A06 Aluminum Alloy Ultrathin Plates[J]. Materials for mechancial engineering, 2021, 45(11): 38~42
赵慧慧,贾洪德,胡蓝,李颖,周佳芬. 5A06铝合金超薄板交流冷金属过渡焊接头的组织与拉伸性能[J]. 机械工程材料, 2021, 45(11): 38~42
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【4】JERGEN B.Cold metal transfer has a future joining steel to aluminum[J]. Welding Journal, 2005, 84:38-40.
【5】ZHANG H T, FENG J C, HE P, et al. 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, 2009, 499(1/2):111-113.
【6】LIN S B, FAN C L, SONG J L, et al. Research on CMT welding of nickel-based alloy with stainless steel[J]. China Welding, 2007, 16(3):23-26.
【7】FURUKAWA K.New CMT arc welding process——Welding of steel to aluminium dissimilar metals and welding of super-thin aluminium sheets[J]. Welding International, 2006, 20(6):440-445.
【8】石常亮, 何鹏, 冯吉才, 等.铝/镀锌钢板CMT熔钎焊界面区组织与接头性能[J]. 焊接学报, 2006, 27(12):61-64. SHI C L, HE P, FENG J C, et al. Interface microstructure and mechanical property of CMT welding-brazed joint between aluminum and galvanized steel sheet[J]. Transactions of the China Welding Institution, 2006, 27(12):61-64.
【9】王志平, 靳朋礼, 贾鹏, 等.送丝位置对铝/镀锌板CMT搭接接头组织与性能的影响[J]. 焊接学报, 2018, 39(10):103-107. WANG Z P, JIN P L, JIA P, et al. Effect of wire feeding positions on microstructure and properties of CMT lap welding joint between aluminum and galvanized steel[J]. Transactions of the China Welding Institution, 2018, 39(10):103-107.
【10】姚屏, 薛家祥, 张思章.轻薄材料低热输入焊接新工艺[J]. 焊接, 2010(8):5-10. YAO P, XUE J X, ZHANG S Z.Low heat input welding technology for light thin materials[J]. Welding & Joining, 2010(8):5-10.
【11】张洪涛, 冯吉才, 胡乐亮.CMT能量输入特点与熔滴过渡行为[J]. 材料科学与工艺, 2012, 20(2):128-132. ZHANG H T, FENG J C, HU L L.Energy input and metal transfer behavior of CMT welding process[J]. Materials Science and Technology, 2012, 20(2):128-132.
【12】汪殿龙, 刘淑琦, 陈彦朝, 等.交流CMT焊接工艺对2198铝锂合金接头组织及性能的影响[J]. 电焊机, 2016, 46(2):43-47. WANG D L, LIU S Q, CHEN Y C, et al. Effect of welding parameters on microstructure and mechanical properties of AC CMT welded 2198 aluminum-lithium alloy[J]. Electric Welding Machine, 2016, 46(2):43-47.
【13】汪殿龙, 张志洋, 梁志敏.铝锂合金1420交流CMT焊接工艺及接头性能研究[J]. 热加工工艺, 2014, 43(9):162-164. WANG D L, ZHANG Z Y, LIANG Z M.Research on AC CMT welding process of 1420 Al-Li alloy and properties of welded joints[J]. Hot Working Technology, 2014, 43(9):162-164.
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