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하드페이싱 오버레이용접 비드형상에 미치는 GMA 용접조건의 영향

Effects of GMA Welding Conditions on the Bead Shape of Hardfacing Overlay Welding

  • 한규호 (한국생산기술연구원 정밀접합팀) ;
  • 김준기 (한국생산기술연구원 정밀접합팀) ;
  • 김철희 (한국생산기술연구원 정밀접합팀) ;
  • 김정한 (한국생산기술연구원 정밀접합팀) ;
  • 남시환 (피케이밸브(주) 기술연구소) ;
  • 전치중 ((주)에이엠티기술)
  • 발행 : 2007.10.30

초록

The relationship between GMA welding conditions and the bead shape of overlay weld was studied by using ${\Phi}1.6mm$ hypo-eutectic metal-cored wire designed for hardfacing against the severe metal-to-metal wear. As the welding voltage increased, the dilution also increased but the sudden drop of dilution was observed at $30{\sim}33V$. It was considered to be due to the decrease of penetration resulting from the change of transfer mode, from short circuit to spray. It was also found that the behavior of penetration with welding current was dependant on the transfer mode. The short circuit mode exerted the penetration to decrease while the spray mode did it to increase with increase of welding current. The former was considered to be responsible for the remarkable decrease in dilution at low welding voltage region. The change of transfer mode also had an effect on the behavior of bead width with welding current but it did not on the bead spreadability defined as W/H ratio. It was considered that the optimal welding conditions for multi-pass overlay welding could be obtained from the bead spreadability suitable for bead lapping and the dilution as low as possible in the spray transfer mode.

키워드

참고문헌

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피인용 문헌

  1. Recent Study in Variation of Welding Materials for Overlay Welding vol.31, pp.6, 2013, https://doi.org/10.5781/KWJS.2013.31.6.17