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Appl. Sci. 2017, 7(3), 261;

The Effect of EN Ratio and Current on Microstructural and Mechanical Properties of Weld Joined by AC-GMAW on Square Groove Butt Joints

Department of Mechanical Engineering, KAIST 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
Author to whom correspondence should be addressed.
Academic Editor: Hai-Lung Tsai
Received: 24 January 2017 / Accepted: 3 March 2017 / Published: 7 March 2017
(This article belongs to the Special Issue Gas Metal Arc Welding)
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In the present work, the effect of welding current and electrode negative (EN) ratio on microstructure and mechanical properties of square groove butt joint produced by alternating current gas metal arc welding (AC-GMAW) process has been investigated. The experiments were conducted using different combination of welding current ranging from 150 A to 250 A with three distinct EN ratios i.e., 0%, 30% and 50% on 5 mm thick steel plates at a constant joint gap of 1 mm and welding speed of 10 mm/s. The effect of current and EN ratio on welding soundness was evaluated through optical microscopy, tensile tests and micro-hardness mapping. The results revealed that, at higher values of currents, an increase in EN ratio resulted an increase in penetration depth. It was found that at a current of 250 A and a 50% EN ratio, the deep penetration was obtained. Tensile test results showed that the tensile strength properties improved with increasing current. Furthermore, the micro-hardness distribution was not strikingly affected by changing the EN ratio. View Full-Text
Keywords: AC-GMAW; EN ratio; thick plate; mechanical properties AC-GMAW; EN ratio; thick plate; mechanical properties

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Ikram, A.; Chung, H. The Effect of EN Ratio and Current on Microstructural and Mechanical Properties of Weld Joined by AC-GMAW on Square Groove Butt Joints. Appl. Sci. 2017, 7, 261.

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