Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Solidification Cracking Behavior in Austenitic Stainless Steel Laser Welds (Part 1) - Evaluation of Solidification Cracking Susceptibility by Laser Beam Welding Varestraint Test -

오스테나이트계 스테인리스강 레이저 용접부의 응고균열 거동 (Part 1) - 레이저 용접용 Varestraint 시험 시스템을 이용한 응고균열 민감도 평가 -

  • Chun, Eun-Joon (Busan Laser Application Support Center, Korea Institute of Machinery and Materials (KIMM)) ;
  • Lee, Su-Jin (Busan Laser Application Support Center, Korea Institute of Machinery and Materials (KIMM)) ;
  • Suh, Jeong (Busan Laser Application Support Center, Korea Institute of Machinery and Materials (KIMM)) ;
  • Kang, Namhyun (Department of Materials Science and Engineering, Pusan National University) ;
  • Saida, Kazuyoshi (Division of Materials and Manufacturing Science, Osaka University)
  • 천은준 (한국기계연구원 부산레이저기술지원센터) ;
  • 이수진 (한국기계연구원 부산레이저기술지원센터) ;
  • 서정 (한국기계연구원 부산레이저기술지원센터) ;
  • 강남현 (부산대학교 재료공학부) ;
  • Received : 2016.08.08
  • Accepted : 2016.10.05
  • Published : 2016.10.31
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Abstract

In order to quantitatively evaluate the solidification cracking susceptibility in laser welds of three types of austenitic stainless steels (type 310: A mode, type 316-A: AF mode, type 316-B: FA mode solidifications), the laser beam welding (LBW) transverse-Varestraint tests consisted of multi-mode fiber laser, welding robot and hydraulic pressure system were performed. As the welding speed increased from 1.67 to 40.0 mm/s, the solidification brittle temperature range (BTR) of laser welds for type 316 stainless steels enlarged (316-A: from 37 to 46 K, 316-B: from 14 to 40 K), while the BTR for type 310 stainless steel reduced from 146 to 120 K. In other words, it founds that solidification cracking susceptibility could not be simply mitigated through application of LBW process, and the BTR variation behavior is quite different upon solidification mode of austenitic stainless steels.

Keywords

References

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