Simulation of Friction Torque in First Phase of Friction Welding.

Kimura, Masao; Yoshioka, Kento; Kusaka, Masahiro; Suyama, Kenji; Fuji, Akiyoshi

doi:10.2207/qjjws.20.546

Cited by 19 publications

(38 citation statements)

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“…3,[8][9][10] The authors also showed that the initial peak torque could be estimated from the relation between the seizure temperature at the weld interface (friction interface or contact surfaces) and the torsional shear strength of the base metal at that temperature. 11 That is, the initial peak torque was determined from the torsional shear strength of the base metal.…”

Section: Introductionmentioning

confidence: 99%

Development of autocompleting friction welding method

Kimura¹,

Fujii²,

Utsumi³

et al. 2008

Science and Technology of Welding and Joining

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This paper describes an autocompleting friction welding method that was carried out to weld with an insert piece set between fixed base metals. The base metal was low carbon steel, and the faying surface of the fixed specimen had a 10 mm diameter. The effect of the thickness of the insert piece (insert thickness) on the joining phenomena was investigated. When the insert thickness was 3?2 mm and the friction welding conditions were a friction speed of 27?5 s 21 and friction pressure of 36 MPa, the insert piece had a shear fracture toward the circumferential direction in the peripheral portion of the weld interfaces by the initial peak produced during the friction process. The joint also had cracks at the adjacent region of the weld interfaces, although it had the same tensile strength as the base metal. On the other hand, the joint made using the insert piece with a groove on its peripheral portion had the same tensile strength as the base metal, where it fractured. This joint also had 90u bend ductility without cracks. In this case, the optimum insert thickness was 4?0 mm, and the thickness at the bottom of the grooves (groove bottom thickness) was 1?2 mm with an 11 mm inner groove diameter, and the friction welding conditions were a friction speed of 27?5 s 21 and friction pressure of 36 MPa. In conclusion, a sound friction welded joint was made by an autocompleting friction welding method.

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Section: Introductionmentioning

confidence: 99%

Development of autocompleting friction welding method

Kimura¹,

Fujii²,

Utsumi³

et al. 2008

Science and Technology of Welding and Joining

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show abstract

“…In this experiment, the friction pressure value was higher than in the previous report, 6 because the seizure portion at the weld interface of the steel friction welded joints was different at those friction pressures. [7][8][9][10] The friction torque in the friction stage was measured with load cells and recorded with a personal computer through an A/D converter at a sampling time of 0?015 s. Only the flash and the holding part of the insert piece were removed from the joint for the tensile test.…”

Section: Methodsmentioning

confidence: 99%

Selection guide of insert piece shape for steel joint by autocompleting friction welding method

Kimura

Utsumi

Kusaka

et al. 2009

Science and Technology of Welding and Joining

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An autocompleting friction welding method, which was developed by the authors, is to weld with using a rotating insert piece set between fixed base metals. This paper describes the selection guide of the insert piece size for steel joints by the autocompleting friction welding method. The base metal was low carbon steel (LCS), and the weld faying surface of the fixed specimen had a 10 mm diameter. The effect of the thickness at the bottom of the grooves for the insert piece (groove bottom thickness) on the joining phenomena was investigated. When the joint was made at a friction pressure of 90 MPa with a friction speed of 27?5 s 21 , the insert piece had a shear fracture towards the circumferential direction (circumferential shear fracture) in the peripheral portion of the weld interfaces by the initial peak produced during the friction process. In this case, the insert piece had the following dimensions: the thickness was 4?0 mm, and the groove bottom thickness was 1?2 mm or over with an inner groove diameter of 11 mm. In particular, the joint with a groove bottom thickness of 1?2 mm had 100% joint efficiency and the LCS base metal fracture with no crack at the weld interface. The value of a circumferential shear fracture (CSF value) was defined and calculated by the ratio between the theoretical and the actual generated friction torques. When the CSF value nearly equalled 1, the joint had 100% joint efficiency and the LCS base metal fracture with no crack at the weld interface.

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“…Tables 1 and 2 show the mechanical and thermal properties of low carbon steel. (13), (27) The mechanical and thermal properties of low carbon steel were used and those values were dependent on the temperature in this study. The value at each temperature were used by linear Table 1 Mechanical properties low carbon steel for calculation.…”

Section: Calculation Of Coefficient Of Seizurementioning

confidence: 99%

“…The value at each temperature were used by linear Table 1 Mechanical properties low carbon steel for calculation. (13) interpolation from Tables 1 and 2. The calculation was carried out by using the following condition: weld interface diameter of 12 mm (its radius was 6.0 mm), friction pressures of 30 and 90 MPa, and friction speed of 27.5 s −1 (1650 rpm).…”

Section: Calculation Of Coefficient Of Seizurementioning

confidence: 99%

“…On the other hand, the authors also proposed that the initial peak torque can be easily calculated by the relationship between the seizure temperature at the weld interface and the yield strength of the base material. (13) However, it is necessary to simulate the initial peak torque and the elapsed time for initial peak torque for various materials because it is expected that this result will be widely applied to the various dissimilar joints. The simulation method for the friction welding is necessary for simulation of the various dissimilar joints for the selection guideline of the friction welding condition, although many researchers have also reported the simulation of friction welding by the finite element method (FEM).…”

Section: Introductionmentioning

confidence: 99%

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Analysis Method of Friction Torque and Weld Interface Temperature during Friction Process of Steel Friction Welding

Kimura

Inoue²,

Kusaka

et al. 2010

JMMP

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This paper describes an analysis method of the friction torque and weld interface temperature during the friction process for steel friction welding. The joining mechanism model of the friction welding for the wear and seizure stages was constructed from the actual joining phenomena that were obtained by the experiment. The non-steady two-dimensional heat transfer analysis for the friction process was carried out by calculation with FEM code ANSYS. The contact pressure, heat generation quantity, and friction torque during the wear stage were calculated using the coefficient of friction, which was considered as the constant value. The thermal stress was included in the contact pressure. On the other hand, those values during the seizure stage were calculated by introducing the coefficient of seizure, which depended on the seizure temperature. The relationship between the seizure temperature and the relative speed at the weld interface in the seizure stage was determined using the experimental results. In addition, the contact pressure and heat generation quantity, which depended on the relative speed of the weld interface, were solved by taking the friction pressure, the relative speed and the yield strength of the base material into the computational conditions. The calculated friction torque and weld interface temperatures of a low carbon steel joint were equal to the experimental results when friction pressures were 30 and 90 MPa, friction speed was 27.5 s −1 , and weld interface diameter was 12 mm. The calculation results of the initial peak torque and the elapsed time for initial peak torque were also equal to the experimental results under the same conditions. Furthermore, the calculation results of the initial peak torque and the elapsed time for initial peak torque at various friction pressures were equal to the experimental results.

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Simulation of Friction Torque in First Phase of Friction Welding.

Cited by 19 publications

References 0 publications

Development of autocompleting friction welding method

Development of autocompleting friction welding method

Selection guide of insert piece shape for steel joint by autocompleting friction welding method

Analysis Method of Friction Torque and Weld Interface Temperature during Friction Process of Steel Friction Welding

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