Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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The Influence of Chemical Compositions of Weld Metal and Welding Conditions on Hot Cracking by Hot Cracking Test

Inconel 690 오버레이용접부의 고온균열 발생에 미치는 용접금속의 화학조성 및 용접조건의 영향

  • 양병일 (두산중공업 기술연구원) ;
  • 지병하 (두산중공업 기술연구원) ;
  • 김정태 (두산중공업 기술연구원) ;
  • 박광식 (창원기능대학 플랜트설비자동화과) ;
  • 최해수 (부경대학교 공과대학 재료공학부) ;
  • 박화순 (부경대학교 공과대학 재료공학부)
  • Published : 2002.06.01
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Abstract

In order to investigate the hot cracking phenomena of the Inconel 690 overlay welds, the hot cracking test(modified Varestraint test) was performed by varying augmented strain and welding speed in GTAW. A total of five kinds of specimens was used in the hot cracking test. The specimens used were two kinds of one layer specimens that were composed of just Inconel 690 deposited metal and three kinds of double layer specimens that were composed with as upper part of Inconel 690 weld metal and lower part of SA508 cl.3 or STS 309L. The main results are as fo11ows: In the welds composed of just Inconel 690, as the augmented strain was more increased and the welding speed was more decreased, the extent of cracking was more increased. And these cracks were mainly solidification cracks, and liquation cracks were also observed partially in HAZ. And hot cracking susceptibily of Inconel 690 welds by using filler metals containing Nb were higher than that of the welds with Nb free. The hot cracking susceptibility of Inconel 690 weld metal was increased with dilution of SA 508 cl.3 and STS 309L, and the influence of SA 508 cl.3 was higher than that of 575 309L. The results of calculation of $TSC\Delta$ and $TLC\Delta$ in Inconel 690 weld metal changed by dilution with base metal or neighboring welds were agreed well with the results of hot cracking test in this study. Therefore, it was expected that the hot cracking was considerably decreased or prevented by using proper welding conditions such as lower heat input, filler metals, base metal and neighboring welds.

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