Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Analysis of the microstructural characteristics of FSW connection of A517 (B) steel and its relation to mechanical properties and corrosion behavior
1
13
FA
M.
Ansaripour
mortezaap@yahoo.com
Y
A.
Soltanpoor
N
A.
Ghasemi
N
M.R.
Dehnavi
N
The aim of this study was to evaluate the mechanical properties and corrosion behavior of friction stir welding (FSW) connection of A517 (B) steel plate. Mechanical properties and corrosion behavior of weld zone were evaluated after reaching to optimum FSW microstructure with the lowest martensite phase. Thus, after the identifying phase microstructure by SEM and XRD analysis, mechanical properties were analyzed by micro-hardness and tensile test. Micro hardness data shows slight increases in stir zone (SZ) compared with the base metal (BM); although a reduction of about 17% in hardness of heat-affected zone (HAZ) was sensible. Reduction of hardness in the HAZ was appeared as drop by about 12 percent of the yield strength and 19 percent of ultimate strength compared with BM. SEM images from fracture surface of the tensile sample showed bi-modal distribution of large and small Dimples being sings of softness of HAZ .Comparing corrosion behavior in solution consist of 3.5 wt% of NaCl showed that there was no passive layers to prevent dissolution of the metal in the SZ and BM. while BM and SZ had fairly similar corrosion rates, Difference of 50 mV between corrosion potential of SZ and BM showed that in galvanic condition, corrosion resistance of BM could be lower than SZ.
friction stir welding, A517(B) steel, microstructural properties, corrosion behavior.
http://jwsti.iut.ac.ir/article-1-72-en.html
http://jwsti.iut.ac.ir/article-1-72-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Study the Profile Shape and Mechanical Properties of Bonded Joint HNV3 to Nimonic 80A Superalloy with Inertia Friction Welding Method
14
20
FA
S.
Sakiyan
N
H.
Sabet
h-sabet@kiau.ac.ir
Y
M.
Abbasi
N
This Paper presents the welding parameter's effect (forging pressure, welding time) on macrostructure and mechanical properties of friction welding valve steel HNV3 to Nimonic 80A super alloy. For this purpose, two rods with 20 mm diameters are prepared and with using different parameters (Increase forging pressure and welding time) by friction welding method are welded together. Tensile Test carried out on samples for investigating the effect of a parameter. It was discovered that when the welding parameters used in connecting HNV3 and Nimonic 80A Superalloy couple through friction welding were selected correctly; strength of the connection would increase compared to the main material.
Nimonic 80A Superalloy, HNV3 Steel, Welding Parameters, Friction welding.
http://jwsti.iut.ac.ir/article-1-71-en.html
http://jwsti.iut.ac.ir/article-1-71-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Investigation of microstructures and mechanical properties of dissimilar welds between Incoloy 825 and 316 stainless steel
21
31
FA
R.
Ghasemi
ghasemirasool@yahoo.com
Y
E.
Heshmat Dehkordi
N
M.
Shamanian
N
In this study, microstructural features and mechanical properties of Incoloy 825-316L stainless steel dissimilar joints have been investigated. For this purpose, pulsed gas tungsten arc welding method was employed and 316L, Inconel 82 and Inconel 625 alloys were used as filler metal. First, specimens were cut. Pulsed gas tungsten arc welding was performed using peak and base currents of 220 A and 110 A, respectively. Microstructure of welded joints was studied using metallographic observations and energy dispersive spectroscopy (EDS) analysis. In order to evaluate the mechanical properties, tensile and microhardness measurements were done on the joints. In all specimens, dendritic and equiaxed and/or cellular growth of austenite phase was observed. Incoloy 625 weld metal had the finest dendritic structure. Tensile test results revealed the ductile fracture with a high percent of elongation for all specimens. The highest tensile strength and percent of elongation of 610 MPa and 48% were obtained for specimen welded using Inconel 625 filler metal. Inconel 625 and 316 stainless steel weld metals showed the highest and lowest microhardness with values of 232 HV and 224 HV, respectively.
Incoloy 825, 316L stainless steel, Dissimilar welding, Pulsed gas tungsten arc welding, Austenitic microstructure, EDS.
http://jwsti.iut.ac.ir/article-1-73-en.html
http://jwsti.iut.ac.ir/article-1-73-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Optimization of variables of friction stir welding process with the aim of achieving the maximum fracture strength
32
48
FA
M.
Safari
m.safari@arakut.ac.ir
Y
H.
Mostaan
N
A.
Bakhtiari
N
In this research, lap joint frictionstir welding of IF sheets with thickness of 0.7 mm is investigated. For this purpose, mechanical properties of joints and also microstructural evolutions are studied. It was found that increase in tool rotational speed and decrease in travel speed results in increase in fracture stress of welded joints. Texture study indicates that no changes can be observed in texture components after friction stir welding. This phenomenon in texture components can be related to high stacking fault energy of IF steel and consequently severe dynamic recrystallization during welding. The results show with increase in the tool rotational speed between 900-1400 Rev/min, ultimate force of fracture of friction stir welded joints is increased. Also, it is concluded from results that with increase in tool travel speed between 50-160 mm/min, ultimate force of fracture of welded joints is decreased. Finally it is proved from results of this paper that in the frictionstir welding of IF sheets with thickness of 0.7 mm, maximum force of fracture of welded joints is achieved in rotational speed of 1400 Rev/min and travel speed of 105 mm/min.
Friction stir welding, IF steel, texture study, Microstructure, optimization.
http://jwsti.iut.ac.ir/article-1-74-en.html
http://jwsti.iut.ac.ir/article-1-74-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Friction stir welding of dissimilar joint of aluminum alloy 5083 and commercially pure titanium
49
56
FA
M.
Sadeghi Gogheri
msg8789@gmail.com
Y
M.
Shabani
N
E.
Mirzapour
N
M.
Kasiri
N
K.
Amini
N
In this study, commercially pure titanium and aluminum alloy 5083 in connection rotational speed of 1120 rpm and a feed rate of 50 mm per minute for butt welding by friction stir welding has been successfully completed. Micro-structure, hardness and tensile test was conducted on the connection. Welding area is a composite of aluminum and titanium particles that the particles plays an important role in increasing hardness and tensile strength. Welding area is also has three areas. Vickers hardness is 480 times the area of welding means that the hardness in the area of the base metal of titanium and aluminum increased by 16% and 60% for titanium aluminum intermetallic compounds is created in the area is weld.
Aluminum 5083, commercially pure titanium, friction stir welding, microstructure, mechanical properties.
http://jwsti.iut.ac.ir/article-1-75-en.html
http://jwsti.iut.ac.ir/article-1-75-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Effect of Heat Input on Microstructure and Mechanical Properties in Friction Stir Welding of HSLA-60
57
68
FA
A.
Behjat
A.behjat@ma.iut.ac.ir
Y
M.
Shamanian
N
M.
Atapour
N
M.
Ahl Sarmadi
N
High-strength low alloy steels are a class of steels used in applications that require high strength and good weldability, including ship hulls, gas pipelines and oil industry. One way to build parts is fusion welding that create areas with a large grain size in the heat-affected zone and increased susceptibility to hydrogen cracking. One way to solve this problem is to use solid state friction stir welding process. In this study, microstructural evaluation and mechanical properties of friction stir welding X-60 cross sections examined by optical microscope and by tensile and micro-hardness tests. The results indicate that changing welding parameters and thereby, change the heat input during friction stir welding have a great impact on maximum temperature and cooling rate that cause creating ferrite and bainitic ferrite in the weld zone. This change in microstructure of weld zone cause to improve mechanical properties that increase yield strength from 380 MPa to 420 MPa .Also, the friction stir process cause increasing hardness of 220 Vickers to an average of 280 Vickers and uniform distribution of hardness in the cross-section of friction stir joints.
High Strength Low Alloy Steel X60, Friction Stir Welding, Solid State Welding, Heat-Affected Zone, Cooling Rate
http://jwsti.iut.ac.ir/article-1-76-en.html
http://jwsti.iut.ac.ir/article-1-76-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
The effect of heat input on the microstructure and hardness of continuous fiber laser welded high Al-content δ-TRIP steel
69
76
FA
Y.
Najafi
yasernajafi311@yahoo.com
Y
F.
MalekGhaini
N
Y.
Palizdar
N
S.
Gholami
N
Recent research suggests that extraordinary combinations of strength and ductility can be achieved in the so-called TRIP steels. With the development of these steels, welding with small weld nugget size and acceptable strength are needed. For these reasons present study was carried out to investigate the effect of heat input onweld size, microstructure and the hardness of the welded metal of 0.4%C- 4%Al δ-TRIP steel after continues fiber-laser welding process. To achieve this goal a bead on plate welding with three different values of heat input 28, 60 and 80 J/mm were used.The results of welding process revealed that by increasing the heat input, cooling rate decreased and the volume percent of the δ-ferrite in weld metal increased due to the availability of sufficient time for partitioning of Al in high heat input which leads to the stable δ-ferrite and as a result the difference between the hardness of the weld metal in comparison to the base metal decreased.
δ-TRIP steel, Heat treatment, Fiber laser welding, Heat input, High Aluminum, Micro hardness
http://jwsti.iut.ac.ir/article-1-77-en.html
http://jwsti.iut.ac.ir/article-1-77-en.pdf
Iranian Institute of Welding and Non Destructive Testing
Journal of Welding Science and Technology of Iran
2476-583X
2676-6787
2
1
2016
8
1
Investigation on Effect of Heat Input on the Microstructure and Mechanical Properties of Hadfield Steel Weld Joints in SMAW Process
77
88
FA
M.
Sabzi
M.Sabzi@iauahvaz.ac.ir
Y
R.
Kalantaripour
N
In this investigation, the effect of heat input of SMAW process on the microstructure and mechanical properties of Hadfield steel weld joints was investigated. For this purpose, 4 annealed sheets with thickness
2 mm prepared from Hadfield steel and then welding applied by SMAW process with 6.75 and 11.25 kJ/mm heat input values. The evaluation of the microstructures of welding joints was conducted by optical microscopy and the joints mechanical properties were examined by tensile, charpy impact and microhardness measuring tests. The results indicated that by increasing the heat input in the SMAW process, microstructure consisted from smaller grains, and strength and microhardness increased but impact energy was reduced.
Hadfield steel, mechanical properties, weld joints, heat input, microstructure.
http://jwsti.iut.ac.ir/article-1-78-en.html
http://jwsti.iut.ac.ir/article-1-78-en.pdf