Na<sub>2</sub>SiF<sub>6</sub>活性激光焊接TC4钛合金焊缝成形和组织

侯继军; 董俊慧; 白雪宇; 韩旭; 杨虎

doi:10.12073/j.hjxb.2019400265

Na₂SiF₆活性激光焊接TC4钛合金焊缝成形和组织

侯继军^1,,
董俊慧^1, ,,
白雪宇¹,
韩旭¹,
杨虎²

1.
内蒙古工业大学，呼和浩特　010051
2.
乌兰察布市工业和信息化局，乌兰察布　012000

基金项目: 国家自然科学基金资助项目(51165027)；内蒙古自然科学基金资助项目(2017MS(LH)0512)

详细信息

作者简介:
侯继军，男，1985年出生，博士研究生. 主要从事钛合金活性激光焊方面研究工作. Email：houjijun_820@163.com

通讯作者:
董俊慧，男，教授，博士研究生导师. Email：jhdong@imut.edu.cn

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- 文章访问数: 409
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出版历程
- 收稿日期: 2019-04-07
- 网络出版日期: 2020-07-12
- 刊出日期: 2019-09-30

Weld shape and microstructure of TC4 laser welding with activating flux of Na₂SiF₆

1.
Inner Mongolia University of Technology, Hohhot 010051, China
2.
Ulanqab Bureau of Industry and Information Technology, Ulanqab 012000, China

摘要

摘要: 采用Na₂SiF₆作为表面活性剂激光焊接TC4钛合金，通过观察焊缝表面，确定了Na₂SiF₆对TC4钛合金激光焊焊缝表面成形的影响；采用高速摄像技术，观察分析了焊件上方高温光致等离子体形态特征变化；借助光学显微镜观察分析了焊缝熔深和熔宽的变化及微观组织. 结果表明，涂覆Na₂SiF₆活性剂后TC4钛合金激光焊焊缝表面成形良好，可使焊缝熔深增加约0.8% ~ 12%，焊缝表面熔宽降低约10% ~ 29%，能够有效提高焊缝的深宽比；Na₂SiF₆活性剂改善了焊缝微观组织的不均匀性，改变了焊缝上部β柱状晶的结晶方向，细化了焊缝的晶粒尺寸和微观组织.
- Na₂SiF₆ /
- TC4钛合金 /
- 等离子体 /
- 焊缝成形 /
- 微观组织
Abstract: Na₂SiF₆ was used as surface activating flux for laser welding of TC4 titanium alloy. The effect of Na₂SiF₆ on TC4 titanium alloy laser welding was determined by observing the weld surface. The morphological characteristics of the high temperature plasma above the workpiece was observed and analyzed by using high-speed digital camera system. The variation of weld depth,width and microstructure were analyzed by optical microscope. The experimental results show that laser weld of TC4 titanium alloy has good appearance with activating flux of Na₂SiF₆, weld penetration increases by about 0.8% ~ 12%, while weld surface width decrease by about 10% ~ 29%, the depth to width ratio is effectively improved. The inhomogeneity of weld microstructure was improved , and the crystallization direction of βcolumnar crystals on the upper part of the weld was changed, the grain size and microstructure of the weld were refined by Na₂SiF₆.
- Na₂SiF₆ /
- TC4 titanium alloy /
- plasma /
- weld shape /
- microstructure

HTML全文

图 1 活性剂涂覆示意图

Figure 1. Schematic of surface activating flux coating

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图 2 焊缝外观成形

Figure 2. Weld appearance

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图 3 焊缝截面形状

Figure 3. Weld cross-section shape

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图 4 焊缝熔深和熔宽变化

Figure 4. Variation of weld depth and weld width

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图 5 焊接过程中等离子体形态特征

Figure 5. Plasma morphology during welding process

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图 6 焊缝微观组织

Figure 6. Microstructure of welded

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表 1 焊接参数

Table 1 Welding parameter

编号激光功率
P/kW 离焦量
d_f/mm 编号激光功率
P/kW 离焦量
d_f/mm

1 3.8 + 2 6 4.1 – 2
2 3.8 0 7 4.1 + 2
3 3.8 – 2 8 4.4 0
4 4.1 + 2 9 4.4 – 2
5 4.1 0

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