Weld Repair for Fatigue-Cracked Joints in Steel Bridges by Applying Low Temperature Transformation Welding Wire

Miki, Chitoshi; Hanji, Takeshi; Tokunaga, Kohei

doi:10.1007/bf03321334

Cited by 26 publications

(14 citation statements)

References 7 publications

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“…Another weld-repair technique which also improves the fatigue performance is based on the application of lowtemperature transformation welding wires. Thereby, compressive residual stress fields in the vicinity of the weld bead are introduced which has a beneficial effect on crack initiation and propagation and therefore enhances the fatigue strength [35].…”

Section: Methodsmentioning

confidence: 99%

Crack propagation analysis and rehabilitation by HFMI of pre-fatigued welded structures

Leitner

Barsoum

Schäfers³

2016

Weld World

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This paper deals with a crack propagation analysis of welded structures and rehabilitation after pre-fatigue loading by the high-frequency mechanical impact (HFMI) posttreatment technique. The investigated specimen type is a thinwalled longitudinal stiffener made of mild steel S355. Fracture mechanical calculations are primarily performed on the basis of the weight-function approach. Thereby, the local residual stress condition at the weld toe is considered by the aid of a structural weld simulation, whereas the numerically evaluated residual stress distribution in depth agrees well to X-ray measurement results. The fracture mechanical analysis illustrates that by incorporating the residual stress state, the calculated lifetime is in good accordance to the conducted fatigue test results. By application of the HFMI-treatment as rehabilitation method, it is found that the beneficial post-treatment effect increases especially by a reduction of the applied load-level. Hence, particularly for minor nominal stress ranges near the high-cycle fatigue region, the mechanical post-treatment as repair method is utmost effective leading to almost equal fatigue strength as for the HFMI-treated specimens without pre-cycling. Finally, proposals for the crack growth assessment of welded structures and a conservative application of HFMI as rehabilitation method for mild steel joints are provided.

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Section: Methodsmentioning

confidence: 99%

Crack propagation analysis and rehabilitation by HFMI of pre-fatigued welded structures

Leitner

Barsoum

Schäfers³

2016

Weld World

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“…The biggest limitation of this method is to create numerous metallurgical defects in the repair site [1]. Other methods include flame welding by spraying powder [2][3][4], Welding on the furnace [5] and drilling and screw-working [6]. Fatigue strength and tensile strength are improved with the help of flame welding method by spraying iron powder done in the location of the cross connection in repairing surface cracks of steel cross connections [3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Other methods include flame welding by spraying powder [2][3][4], Welding on the furnace [5] and drilling and screw-working [6]. Fatigue strength and tensile strength are improved with the help of flame welding method by spraying iron powder done in the location of the cross connection in repairing surface cracks of steel cross connections [3][4]. In repairing surface crack of nickel base super alloy with the help of flame welding by spraying powder was shown that repaired structure is more fine grain and has more strength than conventional repair methods [7][8].…”

Section: Introductionmentioning

confidence: 99%

Repair of Structural Steel Surface Groove by Using Flame Welding Method by Spraying Pure Iron Powder

Keyhany

Vahdat

2016

Archives of Foundry Engineering

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To improve mechanical properties and increasing useful life of metal pieces, different methods of welding are used for repairing surface crack of metal pieces. In this research, performance of flame welding method by spraying pure iron powder evaluated for repairing surface grooves of structural steel. First, four specimens including one control specimen and other three specimens grooved specimens in depth of 1mm and in length of 12.5mm and groove width in the sizes of 0.5, 0.75 and 1mm.were prepared then, powder melted using oxyacetylene reducing flame and spraying iron powder in the flame path and attached to the inner surface of the groove and finally, the specimen repaired. Results showed that after repairing surface groove, tensile strength of the repaired specimens were reached to the tensile strength of control specimen with the margin of 2.5%.

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“…The biggest limitation of this method is to create numerous metallurgical defects in the repair site. Other methods include flame welding by spraying powder [2][3][4], Welding on the furnace [5] and drilling and screw-working [6]. Fatigue strength and tensile strength are improved with the help of flame welding method by spraying iron powder done in the installation location of the cross connection in repairing surface cracks of steel cross connections [3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Other methods include flame welding by spraying powder [2][3][4], Welding on the furnace [5] and drilling and screw-working [6]. Fatigue strength and tensile strength are improved with the help of flame welding method by spraying iron powder done in the installation location of the cross connection in repairing surface cracks of steel cross connections [3][4]. It was shown that repaired structure is more fine grain and has more strength than conventional repair methods in repairing surface crack of nickel base super alloy with the help of flame welding by spraying powder [7][8].…”

Section: Introductionmentioning

confidence: 99%

Repair of Structural Steel Surface Groove by Using Diffusion Welding of Pure Iron Powder

Rahimy¹,

Vahdat²

2016

Archives of Foundry Engineering

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Metal pieces wear out due to variable loading, because cracks formed on their surface of them. In order to increase useful life of metal pieces with the help of different methods of welding, surface cracks are repaired. In this research, performance of the diffusion welding of pure iron powder through magnetic induction evaluated for repairing structural steel surface cracks. First, four specimens prepared including one control specimen and other three specimens grooved specimens in length of 6.25mm and in depth of 1mm and groove width in the sizes of 0.5, 0.75 and 1mm. Then by a coil, the induced current created in the piece surface. After crossing the current, the powder melted and the groove repaired due to diffusion welding. To prevent oxidation, the atmosphere inside the coil filled with argon gas. The results show that after repairing surface groove, tensile strength of the repaired specimens reached to the tensile strength of control specimen with the margin of 7.5%.

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Weld Repair for Fatigue-Cracked Joints in Steel Bridges by Applying Low Temperature Transformation Welding Wire

Cited by 26 publications

References 7 publications

Crack propagation analysis and rehabilitation by HFMI of pre-fatigued welded structures

Crack propagation analysis and rehabilitation by HFMI of pre-fatigued welded structures

Repair of Structural Steel Surface Groove by Using Flame Welding Method by Spraying Pure Iron Powder

Repair of Structural Steel Surface Groove by Using Diffusion Welding of Pure Iron Powder

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