Evaluation of weld bead characteristics of AA6351 welded joints using gas metal arc welding cold metal transfer (GMAW-CMT)
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, i...
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| Format: | Thesis |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8022/ http://eprints.uthm.edu.my/8022/1/suhaila_yacob.pdf |
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| Summary: | 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. |
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