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Evaluation of weld bead characteristics of AA6351 welded joints using gas metal arc welding cold metal transfer (GMAW-CMT)

Yacob, Suhaila (2014) Evaluation of weld bead characteristics of AA6351 welded joints using gas metal arc welding cold metal transfer (GMAW-CMT). Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Evaluation of weld characteristics of AA63 5 1 joints using GMAW -CMT welding process was studied. The study is aimed to determine the effect of welding speed, contact tip to work distance and material thickness on surface roughness, waviness, weld bead width and weld bead height of AA6351 joints, identify type of surface using visual inspection testing and an approach to determine crack defect using dye penetration testing and eddy current testing. GMAW-CMT welding was carried out on 5mm and 6mm thick AA6351 plates. An experimental test was conducted at different level welding speed, contact tip to work distance and material thickness. There are several equipment that had been utilized in order to execute the work such as magnifying glass, vision measuring machine, MG-8 cam gauge, Insize weld gauge, Mahr Marsuft XR 20 surface roughness machine, S-72 cleaner remover,222 dye penetrant, LD-3 developer, NortecB 500 series portable eddy current flaw detector and surface p~obe. The visual inspection, weld bead measurement, surface roughness and waviness measurement, dye penetration testing and eddy current testing have been performed to assess the weld characteristic of AA6351 joints. The results of weld bead width, weld bead height, surface roughness and waviness were analyzed using Minitab 16 software. The results indicated that welding speed, contact tip to work distance and material thickness significantly affected the weld bead width, weld bead height, surface roughness and waviness. The lowest size weld bead width achieved was 5.5mm meanwhile the lowest size weld bead height was 1.3mm.The average roughness; Ra values from 1.971 pm to 5.9394pm were attained on the AA6351 welded joint as well as an acceptable surface finish. The inspection of AA6351 joints indicated the defects like light spatter and porosity. Thus, it shows that GMAW-CMT welding process is the best welding technique that can be applied for production.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK4601-4661 Electric heating
Depositing User: Normajihan Abd. Rahman
Date Deposited: 17 May 2016 07:25
Last Modified: 17 May 2016 07:25
URI: http://eprints.uthm.edu.my/id/eprint/8022
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