아연도금강판에 대한 중첩펄스 MIG 용접에서의 파형제어와 기공 발생 특성

The Waveform Control and Blowhole Generation in the Wave Pulse MIG Welding for Galvanized Steel Sheets

  • 조상명 (부경대학교 신소재공학부 소재프로세스공학전공) ;
  • 김기정 ((주)한라이비텍 기술연구소) ;
  • 이병우 (부경대학교 신소재공학부 소재프로세스공학전공)
  • Cho Sang-Myung (Course of Materials Processing Eng., Div. of Materials Science & Eng., Pukyong National University) ;
  • Kim Ki-Jung (Electron Beam Weld R&D Center, Halla Electron Beam Technology Inc.) ;
  • Lee Byung-Woo (Course of Materials Processing Eng., Div. of Materials Science & Eng., Pukyong National University)
  • 발행 : 2005.02.01

초록

Recently, application of arc welding to galvanized carbon steel sheet is on the increasing Ould in the fields of automobile and construction industries. In arc welding process, zinc is evaporated in weld pool, even under the appropriate welding condition and produce blowhole and/or pit. Zinc gas cause instability of arc and increase spatter and fume. This research is purposed to minimize the heat-input and the formation of porosities in the welded joint of the galvanized carbon steel sheet using variable polarity AC wave pulse MIG welding system. An appropriate welding condition which showed low spatter and good bead appearance was acquired by applying the AC pulse MIG welding machine to DC duplicated MIG welding with the solid wire. When oxygen gas was added to shield gas of MIG welding for galvanized steel sheet, arc length was increased and arc stability was improved. In the AC duplicated welding, the loss of galvanized layer was decreased as the amount of heat-input was decreased when the EN ratio was increased under the condition that average welding current was evenly set.

키워드

참고문헌

  1. H. Matsui. S. Shionoya : Reduction of Blowholes by the Vibration to Molten Pools in Arc Welding of Galvanized Carbon Steel Sheets. Journal of the Japan Welding Society. 16-1 (1998). 45-50(in Japanese) https://doi.org/10.2207/qjjws.16.45
  2. M. Uchihara, T. Taka. H. Miyazaki : Effect of Welding Conditions and Shielding Gas on Weldability of Zinc-Plated Steel. Journal Welding Society. June (1995), II-105-109 (in Japanese)
  3. Hitoshi Matsui. Hiroshi Suzuki et. : Reduction of Blowholes in High Speed Arc Welding of Hot-Dipping Galvanized Steel Sheet. Journal of Japan Welding Society. 15-3 (1973). 476-483 (in Japanese)
  4. K. Yasuda. S. Nakano and T. Nakajima : Avoidance of Blowhole in Arc Welding of Galvanized Steel Sheets. The 5th International Symposium of the Japan Welding Society. April. Tokyo. 1990. 785-790 (in Japanese)
  5. E.N.Gregory : Welding Zinc Coated Steel. Welding Coated Steel. TWI, 5-12
  6. S. L. Lim. H. S. Kong. S. M. Cho : Design Concept and Output Characteristic of AC pulse Waveform for MIG Welding of A1 sheet. Proceedings of the 2002 Spring Annual Meeting of Korean Welding Society. 2002 (in Korean)
  7. H. S. Kong. S. L. Lim and S. M. Cho : The Effect of EN Ratio in AC Pulse Welding Affected Burn Through on MIG Welding for Sheet Al Metal. Proceedings of the 2001 Annual Autumn Meeting of Korean Welding Society. Vol.38 (2001). 15-18 (in Korean)
  8. Doosan World Encyclopedia