Microstructure, mechanical properties and fatigue behaviors of linear friction welded weathering steels

Wang, Yixun; Tsutsumi, Sadami; Kawakubo, Takumi; Fujii, Hidetoshi

doi:10.1016/j.ijfatigue.2022.106829

Cited by 19 publications

(13 citation statements)

References 26 publications

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“…The chemical compositions are shown in Table 1, which is referred from a previous study. 26 Two workpieces of SPA-H with a geometry of 63 mm Â 30 mm Â 3.2 mm were joined by LFW at the frequency = 50 Hz, amplitude = 1.5 mm and applied pressure = 50 MPa. The welding parameters were determined based on the successful joining of steels from previous studies.…”

Section: Methodsmentioning

confidence: 99%

“…The welding parameters were determined based on the successful joining of steels from previous studies. [19][20][21][22]26 The typical appearance of LFW joints is shown in Figure 1. A total of 7 LFW joints were welded using the same welding conditions.…”

Section: Methodsmentioning

confidence: 99%

“…27 The strain distribution on the X-Y plane of the LFW specimen was measured using DIC during the monotonic testing, and the DIC equipment used in this research was the same as in previous studies. 10,17,18,26,28 The fatigue experiment was carried out on a total of 14 LFW specimens by a servo hydraulic testing machine at a loading rate of 16 Hz and stress ratio R = 0.1. The loading rate was decreased to 0.01 Hz every 1000 cycles so that the DIC could be used to measure the strain distribution on the Y-Z surface of the specimen.…”

Section: Methodsmentioning

confidence: 99%

“…The authors previously conducted research on the microstructure, microhardness, ductile strength and fatigue strength of LFW joined weathering steels. 26 The LFW joints with no heat affected zone (HAZ) softening and defects were obtained and the joint efficiency was as high as 100%. The proposed S-N curves illustrated a much higher fatigue strength compared to the FAT112 design curve.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the fatigue strength of LFW joined steels, which is one of the most significant factors considered in structural design, is barely reported in existing references. The authors previously conducted research on the microstructure, microhardness, ductile strength and fatigue strength of LFW joined weathering steels 26 . The LFW joints with no heat affected zone (HAZ) softening and defects were obtained and the joint efficiency was as high as 100%.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fatigue strength and fracture characteristics of linear friction welded joints of weathering mild steel

Wang

Tsutsumi

Kawakubo

et al. 2022

Fatigue Fract Eng Mat Struct

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Weathering steel with high phosphorus content usually cannot be joined by fusion welding due to the possible solidification crack. The present study successfully joined the unweldable weathering steel SPA‐H by linear friction welding (LFW) above the A3 temperature. The microstructure, microhardness, and residual stress were measured and analyzed. The stress concentration factor (SCF) of LFW joints was assessed by the finite element method (FEM). The influence of flash on the fatigue strength and fracture characteristics was investigated. The results suggest that the weld center zone (WCZ) consisting of ferrite and bainite shows a necking shape. The ductile fracture of LFW joints occurred at the base metal, resulting in a joint efficiency close to 100%. The possible unbonded flash at the edge of the LFW joints greatly reduced the fatigue life. The proposed S‐N curve illustrates a much higher fatigue strength than the FAT90 design curve.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fatigue strength and fracture characteristics of linear friction welded joints of weathering mild steel

Wang

Tsutsumi

Kawakubo

et al. 2022

Fatigue Fract Eng Mat Struct

Self Cite

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Significance of fracture toughness for linear friction welded joint of weathering steel

Shimizu,

Nakayama,

Shoji

et al. 2024

Weld World

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This paper examined the characteristics and significance of fracture toughness for LFW (linear friction welding) joints of weathering steel SPA-H processed under different joining conditions to control maximum temperature during LFW process. Two types of LFW joint were prepared; one was jointed under higher compressive pressure so as a maximum temperature during LFW process to be lower than the A1-transformation temperature (A1-LFW), and the other was jointed under lower compressive pressure to be higher than the A3-transformation temperature (A3-LFW). The fracture toughness of both joints where a crack was located at the joint interface exhibited a higher value than that of the heat-affected zone of MAG (metal active gas) welds for the same steel. These results indicated that the LFW was more effective for the joining of weathering steel compared with conventional arc welding in terms of fracture toughness. However, A1-LFW exhibited lower fracture toughness (critical CTOD) than that of base metal or A3-LFW. Thus, the significance of the test results was discussed from mechanical and metallurgical viewpoints. The fracture toughness for A1-LFW found to be deteriorated due to work hardening associated with compressive plastic straining during LFW under higher compressive pressure, where the metal heated under A1-temperature was not completely ejected by friction but remained around the joint interface. On the other hand, the deterioration of fracture toughness for A3-LFW was found to be caused by hardening due to bainitic transformation near the joint interface, whereas the narrowness of the hardened region provided a little bit higher toughness than the intrinsic toughness of the transformed phase due to plastic constraint loss.

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Understanding thermal-mechanical variations and resulting joint integrity of pressure-controlled linear friction welding of thin-steel sheets

Shotri,

Miura,

Geng

et al. 2025

International Journal of Machine Tools and Manufacture

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Microstructure, mechanical properties and fatigue behaviors of linear friction welded weathering steels

Cited by 19 publications

References 26 publications

Fatigue strength and fracture characteristics of linear friction welded joints of weathering mild steel

Fatigue strength and fracture characteristics of linear friction welded joints of weathering mild steel

Significance of fracture toughness for linear friction welded joint of weathering steel

Understanding thermal-mechanical variations and resulting joint integrity of pressure-controlled linear friction welding of thin-steel sheets

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