[1]朱单单,龙绍檑,龙 潇.铝合金换热器真空钎焊过程中Si的分布及其对焊接质量的影响[J].焊管,2021,44(8):11-16.[doi:10.19291/j.cnki.1001-3938.2021.08.003]
 ZHU Dandan,LONG Shaolei,LONG Xiao.Distribution of Si during Vacuum Brazing of Aluminum Alloy Heat Exchanger and its Effect on Welding[J].,2021,44(8):11-16.[doi:10.19291/j.cnki.1001-3938.2021.08.003]
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铝合金换热器真空钎焊过程中Si的分布及其对焊接质量的影响()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
第44卷
期数:
2021年第8期
页码:
11-16
栏目:
试验与研究
出版日期:
2021-08-28

文章信息/Info

Title:
Distribution of Si during Vacuum Brazing of Aluminum Alloy Heat Exchanger and its Effect on Welding
文章编号:
10.19291/j.cnki.1001-3938.2021.08.003
作者:
朱单单龙绍檑龙 潇
1. 贵州永红换热冷却技术有限公司,贵州 惠水558000;
2. 贵州理工学院,贵阳550003
Author(s):
ZHU Dandan LONG Shaolei LONG Xiao
关键词:
铝合金散热器真空钎焊Si元素分布
Keywords:
1. Guizhou Yonghong Cooling Technology Co. Ltd. Huishui 558000 Guizhou China
分类号:
TG113
DOI:
10.19291/j.cnki.1001-3938.2021.08.003
文献标志码:
A
摘要:
为了研究3003铝合金板翅式换热器真空钎焊焊缝中Si的分布对焊接质量的影响机制,采用扫描电镜及能谱(SEM+EDS)分析方法对板翅式换热器钎焊焊缝进行了分析。结果显示,Si在钎缝区主要以两种形式存在:一是以带状富硅相在钎缝组织晶界附近聚集析出,尤其是钎焊炉中靠近炉壁侧试样钎缝中硅含量高达93%;二是以Al-Si或Al-Si-Mn固溶体形态沿钎缝与母材界面曲折分布。此外,钎焊炉中靠近炉壁侧试样因升温快,过热度高,导致钎缝凝固偏析严重,Si偏聚严重,钎缝组织均匀性显著恶化,同时引起凝固末端产生缩孔、微裂纹等缺陷。研究表明,工件在真空钎焊炉中的布置方式对Si在钎缝中的分布状态和钎缝质量有显著影响。
Abstract:
In order to study the influence mechanism of Si distribution in the vacuum brazing weld of 3003 aluminum alloy plate-fin heat exchanger on the welding quality, the brazing weld of plate fin heat exchanger was analyzed by scanning electron microscope and energy dispersive spectroscopy (SEM + EDS). The results show that Si mainly exists in two forms in the brazing seam area: one is that the silicon rich phase is gathered and precipitated near the grain boundary of the brazed joint, especially the silicon content in the brazed joint near the furnace wall is as high as 93%. The other is the zigzag distribution of Al-Si or Al-Si-Mn solid solution along the interface between brazing seam and base metal. In addition, the rapid temperature rise and high temperature of the sample near the furnace wall in the brazing furnace lead to serious solidification segregation, serious Si segregation, significant deterioration of the microstructure uniformity of the brazing seam, and shrinkage cavity, microcrack and other defects at the solidification end. The results show that the layout of the workpiece in the vacuum brazing furnace has a significant effect on the distribution of Si in the brazing seam and the quality of the brazing seam.

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备注/Memo

备注/Memo:
收稿日期:2021-06-21
基金项目: 贵州省教育厅自然科学成长项目“60Si2CrVAT弹簧钢微观组织对形变硬化行为的控制研究”(黔教合KY字[2018] 247);贵州省科技厅资助项目“有效变形体积与高强钢多层次组织的复合关系及对塑韧性的控制研究”(黔科合基础[2020] 1Y199);贵州理工学院高层次人才科研启动经费项目“弹簧钢冷卷加工的组织控制及优化研究”(项目编号XJGC20190949)。
作者简介:朱单单(1986—),男,高级工程师,从事真空钎焊工艺及设计研究。
更新日期/Last Update: 2021-08-27