Fatigue-performance improvement of patch-plate welding via PWHT with induction heating

Aung, May Phyo; Katsuda, Hirohito; Hirohata, Mikihito

doi:10.1016/j.jcsr.2019.05.047

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…For easily considering the annealing effect, this function makes the accumulated plastic strain zero when the The effect of annealing should be considered in the PWHT simulation. The previous studies modeled the annealing effect by considering the creep strain [14,[25][26][27]. Although the simulation accuracy might be high by considering the creep strain as some mathematical formulas, a complicated calculation procedure is required.…”

Section: Analysis Conditionsmentioning

confidence: 99%

“…They estimated that the residual stress relief might contribute to improvement in the fatigue life, in which the fatigue life of the joints might be increased by 2.3 times to 12.7 times from the case without PWHT. Aung et al investigated the effectiveness of PWHT for improving the fatigue strength of patch-plate welded joints by mild steel [14]. They experimentally showed that the fatigue life of the patch-plate welded joints with PWHT was increased by 2.0 to 10.0 times from the case without PWHT, although the improvement effect depended on the fatigue loading conditions.…”

Section: Introductionmentioning

confidence: 99%

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An Economical and Mechanical Investigation on Local Post-Weld Heat Treatment for Stiffened Steel Plates in Bridge Structures

2021

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A heat treatment is effective for reducing the residual stress of the welded structures. A post-weld heat treatment (PWHT) requires a large heating apparatus (furnace). It requires a high energy, a long time, and a high cost. For examining the possibility of cost and energy saving in PWHT work, an economical and mechanical investigation of the local PWHT to stiffened plate members in steel bridges was conducted. The expense of apparatus for the furnace PWHT was 1.5 times higher than that of local PWHT by sheet-type ceramic heaters. When the number of heater units was reduced and were repeatedly used, the expense for the apparatus became lower. However, it took longer to complete the heat treatment than with the furnace PWHT or the local PWHT with full heater units. The thermal elastic-plastic finite element (FE) analysis examined the effect of local PWHT. The tendency of the stress distribution after the local PWHT differed from the welding residual stress or the stress after the furnace PWHT because of the temperature difference between the heated and the non-heated parts of the local PWHT. However, the effect of residual stress relief by the local PWHT could be almost the same as that of the furnace PWHT.

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Section: Analysis Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Economical and Mechanical Investigation on Local Post-Weld Heat Treatment for Stiffened Steel Plates in Bridge Structures

2021

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“…However, depending on the shape and dimensions of the joint and the conditions of cyclic loading, the effect of improving the fatigue life may be greater. For example, at the toe of a welded joint subjected to cyclic compressive loading, if the average stress is decreased by reducing the welding residual stress, the joint is subjected to cyclic compressive loading with high tensile residual stress as it is welded 30) . The effect of greatly improving the fatigue life is expected c ompared to the experimental results obtained in this study.…”

Section: (2) Definition Of Fatigue Lifementioning

confidence: 99%

Residual Stress Reduction of Fillet Box Welded Joints by Local Heating Using Induction Heating Device

2020

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To improve the fatigue life of welded joints in steel bridges, a series of experimental and analytical investigations was conducted on a method of welding residual stress reduction by local heating with an induction heating (IH) device. The IH coil of 110 mm x 40 mm was installed around the fillet weld and heated to 350 °C. The tensile residual stress of about 340 MPa was reduced to under 30 MPa. The local heating experiment was simulated by the thermal elasto-plastic analysis to examine the mechanism of residual stress reduction. A four-point bending fatigue experiment was conducted. The fatigue life of the locally heated joints became two to five times longer than that of the joints without heating under the applied stress conditions of 70 to 100 MPa.

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“…A very important factor limiting the service life of functional surfaces or refurbished units, in addition to defects identifiable by nondestructive testing (NDT), is residual stresses. The processes of manufacturing and refurbishment of functional surfaces are mainly based on metallurgical processes, and the levels of residual stresses are significantly influenced by the type of coating technology used [28][29][30][31][32][33][34][35]. For the evaluation of residual tensions around welds and clads, not only nondestructive (such as X-ray) but also semidestructive assessment methods are currently used [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Effect of Heat Input during Laser Welding on the Magnitude of Residual Stresses in the Refurbishment of Al Alloy Casting

Viňáš,

Brezinová,

Pástor

et al. 2023

Metals

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The paper presents the results of research on the evaluation of the quality of coating layers made by a laser. The base material, which was Dievar steel (1.2343), was coated with a single layer using additional materials in the form of a wire with a diameter of ø 1.0 mm. As additional material, wires with chemistry corresponding to steels 1.2343 and 1.6356 were used. The primary objective was to verify the possibilities of innovative use of additive materials based on maraging steels, which were chosen from the production of two manufacturers with slightly different chemical compositions. The experiment verified the influence of the cladding parameters on the residual stress values around the fabricated maraging layers. Metallographic analysis by light microscopy was carried out in order to identify the individual structures as well as to assess the occurrence of internal defects in the coatings. The effect of the mixing of the coating metal with the base material was also assessed by means of a low-load hardness assessment, which was carried out in accordance with EN ISO 4063-2. Based on the results, it can be concluded that, in terms of residual stresses, the measured values were approximately the same for all the additive materials used; however, due to the desired mechanical properties of the additively formed layers, it is possible to recommend additive materials based on medium- and high-alloy steels for additive manufacturing.

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Fatigue-performance improvement of patch-plate welding via PWHT with induction heating

Cited by 17 publications

References 9 publications

An Economical and Mechanical Investigation on Local Post-Weld Heat Treatment for Stiffened Steel Plates in Bridge Structures

An Economical and Mechanical Investigation on Local Post-Weld Heat Treatment for Stiffened Steel Plates in Bridge Structures

Residual Stress Reduction of Fillet Box Welded Joints by Local Heating Using Induction Heating Device

Determination of the Effect of Heat Input during Laser Welding on the Magnitude of Residual Stresses in the Refurbishment of Al Alloy Casting

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