J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (1): 93-96.

• Research Articles • 上一篇    

Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-T4 Alloy

Namhyun Kang1,Yong-Ho Park2   

  1. 1. Department of Materials Science & Engineering, Pusan National University, San30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea
    2. School of Materials Science & Engineering, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan, 609-735, Korea
  • 收稿日期:2009-04-14 修回日期:2010-05-01 出版日期:2011-01-28 发布日期:2011-01-30
  • 通讯作者: Namhyun Kang

Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-T4 Alloy

B.H. Kim, N.H. Kang, W.T. Oh, C.H. Kim, J.H. Kim, Y.S. Kim, Y.H. Park   

  1. 1) Department of Materials Science and Engineering, Pusan National University, San30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea
    2) Department of Materials and Components Engineering, Dong-Eui University, Busan 614-714, Korea
    3) Advanced Joining Technology Team, KITECH, 7-47, Songdo-dong, Yeonsu-gu, Incheon 406-840, Korea
    4) Division for Dongnam Area Technology Service, KITECH, Jisa-dong, Ganseo-gu, Busan 618-230, Korea
  • Received:2009-04-14 Revised:2010-05-01 Online:2011-01-28 Published:2011-01-30
  • Contact: Kang Namhyun
  • Supported by:

    the Ministry of Knowledge Economy, Republic of Korea, and by NCRC (National Core Research Center) Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0001-222)

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摘要： For Al 6k21-T4 overlap weld joint, the shear-tensile strength by using the weaving laser was improved as compared to the case of linear laser. For the specimen of low strength, the porosity was distributed continuously along the intersection between the plates and fusion line. However, for the optimized welding condition, large oval-shaped porosities were located only in the advancing track of the concave part. Therefore, the continuity of cracks and porosities played a key role to determine the strength. And, the weaving width was also the important parameter to control the strength. Furthermore, the concave part had more significant hot and cold cracking in the weld and HAZ, respectively, than the convex part.

关键词: Weaving laser, Weld microstructure, Void, Al alloy

Abstract: For Al 6k21-T4 overlap weld joint, the shear-tensile strength by using the weaving laser was improved as compared to the case of linear laser. For the specimen of low strength, the porosity was distributed continuously along the intersection between the plates and fusion line. However, for the optimized welding condition, large oval-shaped porosities were located only in the advancing track of the concave part. Therefore, the continuity of cracks and porosities played a key role to determine the strength. And, the weaving width was also the important parameter to control the strength. Furthermore, the concave part had more significant hot and cold cracking in the weld and heat-affected zone (HAZ), respectively, than the convex part.

Key words: Weaving laser, Weld microstructure, Void, Al alloy