[1]张 涛,张 勇,刘宗芳,等.焊接电流对高强铝合金电阻点焊热裂纹的影响[J].焊管,2014,37(2):5-8.[doi:１００１－３９３８（２０１4）02-0005-04]
　ZHANG Tao,ZHANG Yong,LIU Zongfang,et al.The Effect of Welding Current on Hot Cracking During Resistance Spot Weldingfor High Strength Aluminum Alloy[J].,2014,37(2):5-8.[doi:１００１－３９３８（２０１4）02-0005-04]
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焊接电流对高强铝合金电阻点焊热裂纹的影响()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
37
期数:
2014年第2期
页码:
5-8
栏目:
试验与研究
出版日期:
2014-02-28

文章信息/Info

Title:
The Effect of Welding Current on Hot Cracking During Resistance Spot Welding
for High Strength Aluminum Alloy
文章编号:
１００１－３９３８（２０１4）02-0005-04
作者:
张 涛1; 2; 张 勇1; 2; 刘宗芳1; 2; 谢红霞1; 2; 张乾宁3; 石亚宏3
（1. 西北工业大学 凝固技术国家重点实验室 ，西安 710072；
2.西北工业大学  摩擦焊接陕西省重点实验室，西安 710072；
3.中国电子科技集团公司第二十研究所，西安 710068）
Author(s):
ZHANG Tao1; 2;  ZHANG Yong1; 2;  LIU Zongfang1; 2;  XIE Hongxia1; 2;  ZHANG Qianning3;  SHI Yahong3
（1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China；
2.Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072, China；
3.The 20th Research Institute of China Electronics Technology Group Corporation, Xi’an 710068, China）
关键词:
焊接; 电阻点焊; 高强铝合金; 焊接电流; 结晶裂纹; 液化裂纹; 胡须裂纹
Keywords:
welding; resistance spot welding; high strength aluminum alloy; welding current; solidification cracking; liquidation cracking; beard cracking
分类号:
TG453.9
DOI:
１００１－３９３８（２０１4）02-0005-04
文献标志码:
A
摘要:
为了探究焊接电流对高强铝合金电阻点焊热裂纹的影响规律，只改变焊接电流大小，其他焊接参数保持不变，在DZ-3×63型三相次级整流点焊机上进行了2A12-T4高强铝合金的点焊试验。结果表明：随焊接电流的增大，结晶裂纹从无到有、从小到大，当焊接电流为设备最大电流Imax的54%时出现了贯穿整个熔核的结晶裂纹。试验还发现了存在于热影响区中的液化裂纹和胡须裂纹，它们都是晶界的低熔点相受热重新熔化在应力的作用下开裂形成的。
Abstract:
In order to explore the effect rules of welding current on hot cracking during resistance spot welding, 2A12-T4 high strength aluminum alloy was resistance spot welded in DZ-3×63 three phase secondary rectifying spot welding machine with different welding current. Results showed that along with the increase of welding current, the solidification cracking appeared from scratch and proliferated constantly. When the welding current was 54% of equipment maximum current, the solidification cracking ran through the whole nugget. Liquidation cracking and beard cracking were also discovered in the heat affected zone, they both appeared when low melting point phase of grain boundary fusioned and tore by stress.

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备注/Memo

备注/Memo:
收稿日期：2013-12-03
基金项目：国家自然科学基金资助项目（51275418）。
作者简介：张涛（1987—），男，西北工业大学硕士研究生，主要从事铝合金电阻焊方面的研究。
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