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Development of Twin Torch Compound Metal Arc Welding Process to Form for Wide Hardfacing Bead of Wearplate

내마모판의 광폭 경화육성 용접비드 형성을 위한 트윈토치 CMAW 공정개발

  • Cho, Sang-Myung (Div. of Advanced Materials Sci. and Eng., Dept. of Materials Processing Eng., Pukyong National Univ.) ;
  • Kim, Sung-Deok (Doosan Heavy Industries Vietnam) ;
  • Hwang, Kyu-Min (Dept. of Materials Processing Eng., Graduate School, Pukyong National Univ.)
  • 조상명 (부경대학교 신소재공학부 소재프로세스 공학) ;
  • 김성덕 (두산중공업 베트남 법인) ;
  • 황규민 (부경대학교 소재프로세스 공학부)
  • Published : 2008.04.30

Abstract

The wearplate with Cr-C has been used in condition of severe abrasion. Recently, the demand of wearplate made by hardfacing with Cr-C has increased in the world, but it is lack of supply and expensive due to low productivity. CMAW (Compound Metal Arc Welding) is very useful process of several welding methods to make wearplate. In this paper, twin torch CMAW to use twin torch at the same time was developed to improve productivity and to ensure quality of wear plate. When the distance between two touches was smaller than 30mm, arc blow was occurred. However when the distance was larger than 35mm, there was no arc blow any more. If the oscillation path of each torch was overlapped together, the melt through at the overlapped zone was occurred due to concentrated heat input in substrate. On the other hand, the turning point of each torch was open more than 5mm, separated bead was generated. Therefore twin torch CMAW which has adequate conditions was able to make wearplate having flatter surface at the bead connection than single torch.

Keywords

References

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