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TC4钛/5052铝异种金属激光点焊工艺特性研究

Laser Spot Welding Characteristics of Dissimilar Metals:TC4 Titanium/5052 Aluminum

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摘要

利用波长为1070 nm, 最高输出功率为6 kW的连续式光纤激光器, 采用激光点焊技术, 对TC4钛合金/5052铝合金异种金属连接进行工艺特性研究。结果表明, 相同离焦量条件下, 激光功率较小时, 焊接过程中钛/铝接头会形成双熔池, 焊后下部铝合金出现缩孔, 并有气孔和裂纹产生; 增大激光功率, 钛熔化量增加, 液相钛流入焊缝形成钉扎状结构, 边缘处钛铝相互扩散反应, 生成近钛侧的TiAl2相和近铝侧的TiAl3相; 未流入熔合区的钛/铝界面生成TiAl3金属间化合物层, 且随激光功率的增加, 钛-铝反应层增厚。当离焦量小于+50 mm时, 接头强度随激光功率的增大先增大后减小, 最大断裂载荷不足3000 N; 采用+50 mm离焦量时, 随激光功率的变化, 接头强度出现两个峰值, 失效位置分别位于接头界面及铝合金母材处, 断裂形式为准解理断裂和韧性断裂, 最大断裂载荷达到3571 N。

Abstract

We investigate the characteristics of dissimilar metals, such as TC4 Ti alloy/5052 Al alloy, joined via laser spot welding using a continuous fiber laser device of 1070 nm wavelength and 6 kW maximum power. Results indicate that with the same defocusing distance, two molten pools are formed during welding with a low laser power. Shrinkages, pores, and cracks occurred on the Al base metal. With increasing laser power, a part of the molten Ti flowed into the fusion zone, forming a nail shape, due to which mutual diffusion and reaction occurred between the Ti and Al atoms at the edge. TiAl2 and TiAl3 phases are produced close to the Ti and Al sides, respectively. A layer of TiAl3 intermetallic compound formed at the Ti-Al interface but not in the fusion zone. The TiAl3 layer became thicker as the laser power is increased. Joint strength first increases and then decreases with the increasing laser power at defocusing distances is less than +50 mm. The maximum fracture load is less than 3000 N. At the defocusing distance of +50 mm, two peak values of joint strength are observed with a variation of laser power. The fracture locations are distributed at the interface and the Al alloy base metal. Cleavage and ductile fractures are the corresponding forms of fractures. The maximum joint strength reaches 3571 N.

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中图分类号:TG456.7

DOI:10.3788/lop56.031403

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(51504074)、国家重点研发计划(2018YFB1107900)、山东省重点研发计划(2017GGX30147, 2017CXGC0811)

收稿日期:2018-07-10

修改稿日期:2018-08-16

网络出版日期:2018-08-22

作者单位    点击查看

孙逸铭:哈尔滨工业大学(威海)山东省特种焊接技术重点实验室, 山东 威海 264209
张泽群:哈尔滨工业大学(威海)山东省特种焊接技术重点实验室, 山东 威海 264209
檀财旺:哈尔滨工业大学(威海)山东省特种焊接技术重点实验室, 山东 威海 264209哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 黑龙江 150001
赵晓叶:哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 黑龙江 150001
陈波:哈尔滨工业大学(威海)山东省特种焊接技术重点实验室, 山东 威海 264209
宋晓国:哈尔滨工业大学(威海)山东省特种焊接技术重点实验室, 山东 威海 264209哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 黑龙江 150001
冯吉才:哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨 黑龙江 150001

联系人作者:檀财旺(tancaiwang@163.com)

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引用该论文

Sun Yiming,Zhang Zequn,Tan Caiwang,Zhao Xiaoye,Chen Bo,Song Xiaoguo,Feng Jicai. Laser Spot Welding Characteristics of Dissimilar Metals:TC4 Titanium/5052 Aluminum[J]. Laser & Optoelectronics Progress, 2019, 56(3): 031403

孙逸铭,张泽群,檀财旺,赵晓叶,陈波,宋晓国,冯吉才. TC4钛/5052铝异种金属激光点焊工艺特性研究[J]. 激光与光电子学进展, 2019, 56(3): 031403

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