TC4钛合金水下激光填丝焊接工艺研究

doi:10.3901/JME.2020.06.118

机械工程学报 ›› 2020, Vol. 56 ›› Issue (6): 118-124.doi: 10.3901/JME.2020.06.118

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TC4钛合金水下激光填丝焊接工艺研究

郭宁^1,2,3, 成奇², 付云龙^1,2, 张欣², 徐昌盛^1,2, 黄潞²

1. 哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨 150000;
2. 哈尔滨工业大学(威海)山东省特种焊接技术重点实验室威海 264209;
3. 山东船舶技术研究院威海 264209

收稿日期:2019-07-11 修回日期:2019-10-06 出版日期:2020-03-20 发布日期:2020-05-12
作者简介:成奇,男,1992年出生。主要研究方向为水下激光焊接。E-mail:13933851375@163.com;
郭宁(通信作者),男,1982年出生,博士,副教授,博士研究生导师。主要研究方向为水下焊接技术及基础理论、高效化焊接技术、智能制造技术。E-mail:gn21c@126.com
基金资助:
中央大学基础研究基金（HIT.NSRIF.201602，HIT.NSRIF.201704，HIT.MKSTISP.201617）、山东省重点研发计划（2016ZDJS05A07，2017CXGC0922，2018GGX103003）和山东省自然科学基金（ZR2017QEE005，ZR2017PEE010）资助项目。

Research on Underwater Laser Welding with Filler Wire Process of TC4 Titanium Alloy

GUO Ning^1,2,3, CHENG Qi², FU Yunlong^1,2, ZHANG Xin², XU Changsheng^1,2, HUANG Lu²

1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150000;
2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209;
3. Shandong Institute of Shipbuilding Technology, Weihai 264209

Received:2019-07-11 Revised:2019-10-06 Online:2020-03-20 Published:2020-05-12

摘要/Abstract

摘要： TC4钛合金的激光填丝焊成功地被应用到水下领域。通过调节焊接速度和送丝速度，研究TC4钛合金的水下激光填丝焊接工艺，来获得高质量的水下焊缝。焊接结束后，分析了不同工艺参数下焊缝的宏观形貌，微观成形，以及微观组织和力学性能。结果表明，当焊接速度和送丝速度分别为20 mm/s和60 mm/s时，可以得到成形良好、连续稳定的焊缝。焊缝中心区是分布散乱的针状马氏体，热影响区主要可以分为近焊缝区和近母材区两部分，近母材区的α'相比近焊缝区的α'相少，这是因为近焊缝区的温度更高，更多的β相转变成α'相。随着焊接速度（或送丝速度）的增大，接头的屈服强度与冲击韧度均表现出先增加后减少的趋势，并且在焊接速度为20 mm/s，送丝速度为60 mm/s时，二者均达到最大值，屈服强度为813.42 MPa，冲击韧度为39.07 J/cm²。较大的深宽比和焊缝横截面积可以提高接头的力学性能。通过扫描电镜观察分析断口形貌，发现断口为解理和韧性混合断裂形式。

关键词: 水下激光焊接, 局部干法, 宏观形貌, 微观成形, 微观组织, 力学性能

Abstract: Laser welding with filler wire of the TC4 titanium alloy has been successfully applied in underwater field. The underwater laser welding with filler wire of TC4 titanium alloy was researched by adjusting welding speed and wire feed speed to obtain high quality underwater weld metal. After welding, the welding surface appearance and micro forming, as well as the microstructure and mechanical properties of the weld metal under different process parameters are analyzed. The results show that when the welding speed and wire feed speed are 20 mm/s and 60 mm/s respectively, a well-formed and continuously stable weld metal can be obtained. The center of the weld metal is scattered acicular martensite, besides, the heat affected zone can be divided into two parts, they are mainly near the weld metal zone and the close to base metal zone, the α' phase of the close to the base metal zone is less than that of the near the weld metal zone, because the temperature of the close to base metal zone is higher, more β phase change to α'phase. With the increase of welding speed (or wire feed speed), both yield strength and impact toughness of the welded joints show a trend of increasing firstly and then decreasing. When the welding speed is 20 mm/s and wire feeding speed is 60 mm/s, both of them reach the maximum value, the yielding strength is 813.42 MPa and impact toughness is 39.07 J/cm². Larger aspect ratio and cross-sectional area of weld metal can improve the mechanical properties of joints The fractures are surveyed to obtain the surfaces traits by the scanning electron microscope, it can be found that they are mixed fractures of cleavage fracture and dimple fracture.

Key words: underwater laser beam welding, local dry cavity, welding surface appearance, micro forming, microstructure, mechanical properties

中图分类号:

TG156

郭宁, 成奇, 付云龙, 张欣, 徐昌盛, 黄潞. TC4钛合金水下激光填丝焊接工艺研究[J]. 机械工程学报, 2020, 56(6): 118-124.

GUO Ning, CHENG Qi, FU Yunlong, ZHANG Xin, XU Changsheng, HUANG Lu. Research on Underwater Laser Welding with Filler Wire Process of TC4 Titanium Alloy[J]. Journal of Mechanical Engineering, 2020, 56(6): 118-124.

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TC4钛合金水下激光填丝焊接工艺研究

Research on Underwater Laser Welding with Filler Wire Process of TC4 Titanium Alloy

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