29 Experimental Study of Friction Stir Welding …
311
183.767
190.572
179.135
195.616
184.373
230.16
0
50
100
150
200
250
Tensile, MPa
Specimen No.
Specimen 1
Specimen 2
Specimen 3
Specimen 4
Specimen 5
Base Metal (BM)
Fig. 29.1 Tensile strength result
Macrostructure testing is one of the non-destructive testing (NDT) method which
only can be done under a microscope or very high resolution camera [6]. This testing
is done to find the micro defects that cannot be detected by naked eyes. After been
observed by using the optical microscope, the result and analysis is described in
Table 29.5.
Based on the result that has been recorded, there is slightly different values in
terms of strength [7]. The specimen with parameter of 910 rpm with travel speed
340 mm/min gives the longest elongation with 0.031 mm/mm compared to other
parameters. Using this parameter setting can achieve up to 85% strength compared
to the base metal of AA5052. It shows that this method of joining and parameter
setting gives a good welding joint.
In terms of maximum load strength, the maximum result recorded is at 910 rpm
with a travel speed of 340 mm/min gives 2053.972 N. The result for elastic material
property is at 28,483.07 MPa. Based on the tensile strength, it has been recorded that
the highest tensile strength obtained is 195.616 MPa.
The sizing standard is referring to the ASTM E340-95 standard. The cutting
process for both specimens was also be done at JMTI premise. After been inspect
using the optical microscope, it appears slag inclusion in specimen 3 and specimen 5.
Overall, the parameter setting of 910 rpm with a travel speed of 340 mm/min is
the perfect combination which gives no defect on the welded joint. However, a gear
malfunction of the MILKO 37 during the welding process caused some vibrations
which gave some impact on the welding surface. The macrostructure of parameters
at 910 rpm with a travel speed of 340 mm/min on the other hand shows a free defect
welded joint and higher tensile strength capability.
311
183.767
190.572
179.135
195.616
184.373
230.16
0
50
100
150
200
250
Tensile, MPa
Specimen No.
Specimen 1
Specimen 2
Specimen 3
Specimen 4
Specimen 5
Base Metal (BM)
Fig. 29.1 Tensile strength result
Macrostructure testing is one of the non-destructive testing (NDT) method which
only can be done under a microscope or very high resolution camera [6]. This testing
is done to find the micro defects that cannot be detected by naked eyes. After been
observed by using the optical microscope, the result and analysis is described in
Table 29.5.
Based on the result that has been recorded, there is slightly different values in
terms of strength [7]. The specimen with parameter of 910 rpm with travel speed
340 mm/min gives the longest elongation with 0.031 mm/mm compared to other
parameters. Using this parameter setting can achieve up to 85% strength compared
to the base metal of AA5052. It shows that this method of joining and parameter
setting gives a good welding joint.
In terms of maximum load strength, the maximum result recorded is at 910 rpm
with a travel speed of 340 mm/min gives 2053.972 N. The result for elastic material
property is at 28,483.07 MPa. Based on the tensile strength, it has been recorded that
the highest tensile strength obtained is 195.616 MPa.
The sizing standard is referring to the ASTM E340-95 standard. The cutting
process for both specimens was also be done at JMTI premise. After been inspect
using the optical microscope, it appears slag inclusion in specimen 3 and specimen 5.
Overall, the parameter setting of 910 rpm with a travel speed of 340 mm/min is
the perfect combination which gives no defect on the welded joint. However, a gear
malfunction of the MILKO 37 during the welding process caused some vibrations
which gave some impact on the welding surface. The macrostructure of parameters
at 910 rpm with a travel speed of 340 mm/min on the other hand shows a free defect
welded joint and higher tensile strength capability.