The effects of different types of welding current on the characteristics of nickel aluminum bronze using gas metal arc welding
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Publication Details
Author list: Sriintharasut S., Poopat B., Phung-On I.
Publisher: Elsevier
Publication year: 2018
Volume number: 5
Issue number: 3
Start page: 9535
End page: 9542
Number of pages: 8
ISSN: 2214-7853
eISSN: 2214-7853
Languages: English-Great Britain (EN-GB)
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Abstract
This study aims to investigate the effects of different types of welding current on the characteristics of Nickel Aluminum Bronze Alloy (NAB) such as microstructure, hardness, depth/width ratio and dilution by using Gas Metal Arc Welding (GMAW). The mechanized GMAW was employed for the bead on plate welding of NAB using 3 levels of heat input, 500-600 J/mm, 700-800 J/mm. and 800-900 J/mm with 2 types of welding current: standard and pulsed. The AWS.A5.7 ERCuNiAl solid wire and 100% argon shielding gas were applied. The results indicated that welding current types did not significantly affect the microstructures in the weld area and heat affected zone (HAZ).The hardness of welding from both welding current types were comparable with the average hardness of 160-180 HV in weld metal and 200-240 HV in the HAZ. Nevertheless the more heat per unit length (HI) was the higher depth/width ratio was. However, for pulsed current, the metal was transfer form solid wire to the NAB during the peak current of pulsed current resulting in deeper penetration but with higher dilution ratio compared to standard current. This could indicate that the pulsed current could be more appropriated for groove welding while the standard current for the built-up overlay welding. ฉ 2017 Elsevier Ltd. All rights reserved.
Keywords
Pulsed current, Standard current
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