Weld repair of gas turbine disc: optimization of pulsed TIG welding process parameters and microstructural analysis of Cr–Mo-V Steel

Vahdatkhah, Parisa; Kopaee, Seyed Roohallah Tabatabaee; khah, Hamed Vahdat

doi:10.1007/s00170-022-10174-7

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…Desirability contours are graphical representations used to visualize the variation in desirability values across different levels of multiple process parameters [22,23]. The contour plots is consisted of undulating lines, each representing a specific level of desirability, with regions of higher desirability being indicated by denser color (from light green to dark red) with closer contour lines.…”

Section: Desirability Function Of Dissimilar Weld Jointmentioning

confidence: 99%

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Benlamnouar,

Bensaid,

Saadi

et al. 2024

Mater. Res. Express

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In this study, response surface methodology (RSM) was employed to optimize the welding parameters' effects on mechanical properties of dissimilar welds between Cr-Mo steel grade (P11) and austenitic stainless steel (AISI 316LN). To determine the best welding parameters, variance analysis (ANOVA), desirability function, and perturbation analysis were used to create regression models and identify the significant parameters influencing tensile strength and hardness gaps in the weld joints. The results indicated that welding speed is the most significant parameter affecting both the austenitic hardness gap and tensile strength, while gas flow has the most significant impact on the hardness gap of Cr-Mo steel. Furthermore, welding speed positively influences the mechanical properties of dissimilar weld, whereas welding current has a slight negative effect on tensile strength. The optimum welding parameters were found to be 130 A for welding current, 70 mm/min for welding speed, and 13 l/min for welding gas flow, resulting in hardness gap values of 18.10 HV (Stainless steel side), 27.38 HV (Cr-Mo steel side), and a tensile strength of 453.90 MPa. The optimum parameter effect is concentrated at the weld interfaces between the fusion zone and the heat-affected zone. This effect led to limitations in grain coarsening, a reduction in the martensite and delta ferrite phase percentages, a slight increase in the bainite ratio, and a decrease in carbide precipitations. As a result, a homogenization of strain distribution in the optimum weld was achieved, leading to ductile fracture in Cr-Mo steel.

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Section: Desirability Function Of Dissimilar Weld Jointmentioning

confidence: 99%

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Benlamnouar,

Bensaid,

Saadi

et al. 2024

Mater. Res. Express

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“…At high frequency pulses, arc ignition using electrical discharge was done from a capacitor. The process parameters for UHFP-GTA welding were set by conducting trials and from previous investigations [29,30]. At five different UHFPs, dissimilar (AISI409-AISI430) joints were fabricated.…”

Section: Base Materials Evaluation and Welding Processmentioning

confidence: 99%

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Nagarajan,

Marimuthu

2023

Mater. Res. Express

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The Mechanical and Stretch-Bend Failure studies on Ultra High Frequency Pulsed Gas Tungsten Arc Welded dissimilar joints of AISI409-AISI430 Ferritic Stainless Steels were conducted. Welding was conducted with 5 ultra high frequencies (50 Hz, 150 Hz, 250 Hz, 350 Hz, 450 Hz). Mechanical characteristics evaluation on the joints included tensile strength, microhardness variations across the welds and creep. Microstructural and metallurgical investigations included weld cross section evaluation, comparing grain variations in high, medium and low thermal heat affected zones, weld zones and base material region. Stretch bend failure studies included studies on angular distortion, fracture limit strain, and coefficient of friction. Tests revealed that joints welded at 350Hz was better, compared to other joints. Dissimilar AISI409-AISI430 joint fabricated at 350Hz exhibited 267 + 3 MPa as yield and 409 + 6 MPa and as ultimate tensile strength. Its creep fracture duration was 72.7 mins (highest among the joints). Microstructural studies revealed grain growth, partially coarse and partially fine grains in heat affected zones. Depending on the difference in grain sizes, on both sides of the welds, heat affected regions were identified as three distinct zones. In AISI430 side; high temperature austenitic, martensitic, delta ferrites and in AISI409 side; needle like martensitic structures, mixture of ferritic-austenitic, δ-ferrite with carbide precipitation were found in high, medium and low thermal heat affected zones, respectively. On increasing the ultra high frequency pulses, angular distortion increased, fractures changed from tensile/shear type to mixed type. In shear bend tests, on increasing the ratio of radius: thickness, fracture limit strain on outer surface, across sheet thickness, due to stretching increased.

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“…Although laser beam and electron beam welding methods are gradually being used in a wide range of industries [10][11][12][13], the Tungsten inert gas (TIG) welding is a joining method that is frequently used to aerospace parts, such as rotating blades, pressure vessel [14] ,vanes, and gas turbine disc [15]. It has advantages such as stable arc and easy adjustment of heat input.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation research on welded residual stress and distortion of aero-engine afterburner lobe mixer with different welding sequences

Jin

Chen

Liu

et al. 2023

Int J Adv Manuf Technol

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Most thin-walled parts of aero-engines with intricate surfaces, such as lobe mixer, are welded using tungsten inert gas (TIG), which will certainly induce stress and distortion, causing a serious in uence on assembly accuracy. The objective of this study was to establish a nite element model to optimize TIG wire ller welding sequence for an aero-engine lobe mixer composed of GH3044 nickel-based superalloy at the thickness of 2 mm. A new method for optimizing residual stress and deformation in the welding of large-size components was proposed.We carried out a 2 mm thickness plate TIG wire ller welding experiment to obtain the ideal process parameters and validate the heat source model and thermal boundary condition, and also designed a set of frock clamp.The stress and distortion of the lobed mixer were analyzed under various welding sequences based on the established nite element model. The results of the study showed that the peak residual stress difference of the lobe mixer is smaller using such a xture. Different welding sequences affected the stress uniformity throughout the structural member. The symmetrical welding of single weld was a better process, with a peak distortion of only 0.54 mm and uniform stress distribution.

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Weld repair of gas turbine disc: optimization of pulsed TIG welding process parameters and microstructural analysis of Cr–Mo-V Steel

Cited by 4 publications

References 24 publications

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Multi-objective optimization and evolution of dissimilar welding process between Cr-Mo steel and austenitic stainless steel for power plant application

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Numerical simulation research on welded residual stress and distortion of aero-engine afterburner lobe mixer with different welding sequences

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