Induction heating assisted alternating current gas metal arc welding (IH-ACGMAW) for thick steel plate applications = 후판 적용을 위한 유도 가열 기반의 교류 전류-가스메탈 아크 용접에 관한 연구

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Competition in the shipbuilding and offshore industries has generated a demand for the use of materials that can provide high productivity with low manufacturing costs. One method to overcome these challenges is the use of high-strength steels, providing a better strength to weight ratio. However, the application of high strength materials is restricted by the need of cost effective low heat input welding process. The higher heat affected zone (HAZ) producing process deteriorates the weld joint properties of these thermally treated steels by large. Previously, alternating current gas metal arc welding (AC-GMAW) has been applied to thin sheets due to low heat input and higher material deposition rates. Quite recently, some unique findings of high penetration and stable welding arc have been reported on bead on plate (BOP) welding for steel by using an improved current waveform. Electrode negative (EN) region of the current waveform is divided into an EN base region and a peak region; resulting in a finger like penetration providing good root quality. The work is extended here and the AC-GMAW process is employed on thick steel plate welding ranging from 5 mm to 10 mm in a single pass. However a lack of fusion is reported on the joint sides for material thickness above 7 mm. The controlled induction pre-heating on the joint sides up to the desired depth can help in overcoming this problem. The induction heating source can pre-heat the workpiece in the desired manner to control the penetration properties. Different coil designs with appropriate power supply configuration can be used to rapidly pre-heat the joint in the desired pattern; followed by higher material deposition by the AC-GMAW process. The development in the proposed process of induction heating assisted alternating current gas metal arc welding (IH-ACGMAW) can pave the way for the welding of thick steel plates at reasonable welding speeds with minimum HAZ.
Chung, Hyunresearcher정현researcher
한국과학기술원 :기계공학과,
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학위논문(박사) - 한국과학기술원 : 기계공학과, 2018.2,[vi, 111 p. :]


Alternating current gas metal arc welding▼aInduction assisted welding▼apenetration depth▼aInduction coil configurations▼aArc interruptions; 교류 가스 금속 아크 용접▼a유도 보조 용접▼a침투 깊이▼a유도 코일 구성▼a아크 중단

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