| dc.description.abstract | The process of replating or errors in the grafting material welding Al-Mg 5083 often
found in the shipping industry it is necessary to repair or re-welding. In this thesis,
the process of re-using a welding machine welding GMAW (Gas Metal Arc Welding)
with given variations in the depth of the weld metal reduction of 3 mm and 6 mm
repair to know how big effect on the value of tensile strength and microstructure and
weld defects caused by porosity. From the tensile test results obtained with the
highest tensile strength variation reduction of 6 mm depth of the weld metal repair of
78.15 MPa and strain values of 9.66%. We have the largest percentage porosity
value at the beginning of the weld material / rejected by the greatest density of
0.467% and repeated variations on the process of welding the weld metal reduction
in the depth of 6 mm by 2.5 gram/cm3. The test results obtained radiographic
indication of the porosity of the smallest defect in the reduction of the depth variation
of the weld metal 6 mm number one with a diameter of 6 mm. In the observation of
micro structure, visible amount of magnesium silicate particles (Mg2Si) contained
the most variation in weld metal reduction of 6 mm depth of the weld metal. Mg2Al3
presence will also increase the toughness of the material, the content of zirconium
(Zr) and some titanium (Ti) role as the resultant refiner details (grain-refiner),
increased levels of refinement details with increasing heat input and speed welding.
Key word : Al-Mg 5083, GMAW welding, repair, tensile strength, density, porosity
percentage, radiography, microstructure. | en_US |
