EVALUATION OF WELD BEAD CHARACTERISTICS OF AA6351 WELDED JOINTS USING GAS METAL ARC WELDING COLD METAL TRANSFER (GMAW-CMT) SUHAILA BINTI YACOB A thesis submitted in partial fulfillment of the requirements for the award of the Degree of Master of Mechanical Engineering with honors. Faculty of Mechanical and Manufacturing Engineering SEPTEMBER 2014
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EVALUATION OF WELD BEAD CHARACTERISTICS OF AA6351
WELDED JOINTS USING GAS METAL ARC WELDING COLD METAL
TRANSFER (GMAW-CMT)
SUHAILA BINTI YACOB
A thesis submitted in partial
fulfillment of the requirements for the award of the
Degree of Master of Mechanical Engineering with honors.
Faculty of Mechanical and Manufacturing Engineering
SEPTEMBER 2014
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
dan pengukuran keberombakan , ujian penembusan pewarna dan ujian arus pusar
telah dijalankan untuk menilai ciri sambungan AA6351.Perisian MINITAB 16 telah
digunakan bagi menganalisi lebar kimpalan man&,ketinggian kimpalan
manik,kekasaran permukaan dan keberombakan.Keputusan menunjukkan bahawa
kelajuan kimpalanjarak tip dan ketebalan bahan telah memberi kesan kepada lebar
kimpalan manik , ketinggian manik kimpal , kekasaran permukaan dan
keberombakan . Saiz paling rendah kimpalan manik lebar dicapai adalah 5.5mm
Sementara itu saiz paling rendah ketinggian kirnpalan manik adalah 1.3mm.
Kekasaran purata; nilai Ra dari 1.971pm ke 5.9394ym telah dicapai pada AA6351
dikimpal bersama serta kemasan permukaan diterima Pemeriksaan sendi AA6351
menunjukkan kecacatan seperti merenjis cahaya dan keliangan.Oleh itu, ia
menunjukkan bahawa proses kimpalan GMAW - CMT adalah teknik kimpalan yang
terbaik yang boleh digunakan untuk pengeluaran.
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