Influence of welding interpass temperature on Charpy V-notch impact energy of coarse-grain heat-affected zone of AISI 4130 steel pipe

Dornelas, Paulo Henrique Grossi; Farias, Francisco Werley Cipriano; Oliveira, Victor Hugo Pereira Moraes e; Moraes, Diogo de Oliveira; Júnior, Petrônio Zumpano; Filho, João da Cruz Payão

doi:10.1007/s00170-020-05542-0

Cited by 19 publications

(5 citation statements)

References 67 publications

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“…Such thermodynamically favorable conditions promoted greater diffusion of the alloying elements, thus decreasing the hardening by solid solution in the resulting ferritic microstructure. This difference in diffusion The decrease in microhardness with the reduction in cooling rate was also observed in other studies [4,37,42]. For the ICCGHAZ, the increase in IT did not strongly influence the Vickers microhardness because the cooling rates arising from the different ITs are similar (Fig.…”

Section: Mechanical Testingsupporting

confidence: 83%

“…The welding simulation was validated by comparing the simulated welding thermal cycles (Sysweld®) in the last four weld passes with the actual thermal cycles measured with thermocouples; both were obtained from the base metal 25 mm away from the joint groove. A similar validation procedure is specified in ISO 18166, which has been used by other authors in the literature [4,12,31]. Figure 6 shows the excellent correlation between the simulated and measured welding thermal cycles.…”

Section: Fem Model and Its Validationmentioning

confidence: 82%

“…The reduction of the welding time can be achieved by developing welding parameters, such as high heat input [1] and welding current [2]. However, this can decrease the hardness and impact toughness [3,4] of the heat-affected zone (HAZ) of highstrength low-alloy (HSLA) steels because of the formation of brittle regions, such as a coarse-grain HAZ (CGHAZ) [5] and an intercritically reheated coarse-grain HAZ (ICCG-HAZ) [6], which increase the risk of welded joint failure [7].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the interpass temperature on simulated heat-affected zone of gas metal arc welded API 5L X70 pipe joint

Dornelas

Filho

Oliveira

et al. 2021

Int J Adv Manuf Technol

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Welding costs associated with the laying of pipes for deepwater oil and gas extraction can be reduced using high interpass temperatures (ITs). However, a high IT can decrease the mechanical properties of the heat-affected zone (HAZ) of welded joints. With the use of high strength-toughness steels, this decrease may be an acceptable trade-off. Therefore, it is necessary to evaluate the influence of high ITs on the HAZ. The influence of the IT on the coarse-grain HAZ (CGHAZ) and intercritically reheated coarse-grain HAZ (ICCGHAZ) of an API 5L X70 pipe joint welded by gas metal arc welding was investigated. The welding was numerically simulated using finite element method software. The microstructure of the HAZ was predicted using thermodynamic simulation software. The CGHAZ and ICCGHAZ were also physically simulated and evaluated via optical microscopy and scanning electron microscopy, dilatometry, and Vickers microhardness and Charpy V-notch (CVN) impact tests. The increase in IT led to a decrease in CGHAZ microhardness but did not affect the ICCGHAZ. The CVN energies obtained for all ITs (CGHAZ and ICCGHAZ) were higher than that set by the DNVGL-ST-F101 standard (50 J). These results show that increasing the IT is an interesting and effective method to reduce welding costs. In addition, thermodynamic simulation proved to be a valid method for predicting the phases in the HAZ of API 5L X70 pipe welded joints.

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Section: Mechanical Testingsupporting

confidence: 83%

Section: Fem Model and Its Validationmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Effect of the interpass temperature on simulated heat-affected zone of gas metal arc welded API 5L X70 pipe joint

Dornelas

Filho

Oliveira

et al. 2021

Int J Adv Manuf Technol

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“…Enforcing a maximum interpass temperature limit during a welding operation is widely used [15,16] as a means to control material microstructure evolution and material properties of the weld, such as the impact energy [17,18]. As detailed in the pseudocode in Algorithm 1, the WAAM repair simulator monitors the temperature ahead of the torch on the welding path.…”

Section: Path Decision Making Based On the Temperature Fieldmentioning

confidence: 99%

A fast simulation method for thermal management in wire arc additive manufacturing repair of a thin-walled structure

Qvale,

Njaastad,

Bræin

et al. 2024

Int J Adv Manuf Technol

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Ensuring first-time-right on-site repair of critical structures is a key challenge for additive manufacturing (AM)–based repair solutions. Fast thermal simulations are thus needed to plan efficient and error-free AM processes. This paper addresses a fast thermal simulation method for a novel subsea wire arc additive manufacturing (SWAAM) repair procedure. Current commercial finite element (FE) codes for typical welding and AM are computationally expensive and slow. The presented 2D finite difference approach can be used to simulate SWAAM on a damaged plate with around 70 times acceleration compared to real welding times, without the use of parallelization. Although not being able to accurately represent the temperature in close vicinity of the welding torch, the approach shows excellent correspondence with FE simulations and experiments in regions of the plate where the temperature has assumed a distribution that is largely two-dimensional. Compared with FE simulations, the approach is experimentally verified to be accurate to 10 °C within 7 s after the welding torch has passed a point on the plate. Thus, the approach can provide a measure of the global temperature field in a thin-walled structure during repair. The thermal simulation is preceded by a welding path planner, which generates appropriate paths based on slicing of a 3D surface scan of the damage that is to be repaired. Damages to equipment or non-ideal welding conditions are prevented by automatically pausing the welding if the calculated temperature in the path ahead of the welding torch exceeds a predefined interpass temperature limit.

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“…Although information regarding carbon content and heat treatment procedures remain still limited for selecting casting steels that are suitable for offshore structures, these steels are extensively used in the naval and offshore industry [13,[21][22][23][24] in the manufacturing of industrial parts earlier produced by expensive manufacturing processes, such as extrusion or forging and other complex thermo-mechanical processes [13]. When comparing high strength cast steels applied in mooring components manufactured by different routes (Table 2), the advantages of cast steels can be noted, because these steels present lower carbon and carbon equivalent contents in comparison to the forged steel widely used in the offshore industry, such as DIN 34CrNiMo6 [17], AISI 4130 [25,33] and AISI 8630 [26]. While chromium is the main contributing factor increasing the mechanical strength in rolled steels, higher nickel contents are the preference in cast steels.…”

Section: Gradementioning

confidence: 99%

Evaluation of High Strength Cast Steel Welded Joints Suitable to Mooring Components

et al. 2022

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This work investigates the performance of high strength cast steel welded joints to confirm their feasibility for application in mooring components. Three welded joints, with ultimate tensile strength in the range of 700 to 900 MPa, were obtained by the shielded metal arc welding process, the most applied in repair operation. After welding, a post welding heat treatment was performed to relieve the residual stresses. The results obtained in tension, impact Charpy-V, and hardness tests, at different positions of the heat affected zone were compared with equivalent welded joints performed with rolled steels currently applied in mooring chain links. These results showed that cast steels can obtain results equivalent to the rolled steels. Furthermore, the composition of cast steels for more stringent requirements (UTS > 860 MPa) is adjusted with higher nickel contents, while rolled and forged steels show increased C, Cr, and Mo contents. As a consequence, a refined microstructure with excellent impact toughness was obtained. Thus, these steels present a high potential to be used in this application contributing to reduce manufacturing costs.

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Influence of welding interpass temperature on Charpy V-notch impact energy of coarse-grain heat-affected zone of AISI 4130 steel pipe

Cited by 19 publications

References 67 publications

Effect of the interpass temperature on simulated heat-affected zone of gas metal arc welded API 5L X70 pipe joint

Effect of the interpass temperature on simulated heat-affected zone of gas metal arc welded API 5L X70 pipe joint

A fast simulation method for thermal management in wire arc additive manufacturing repair of a thin-walled structure

Evaluation of High Strength Cast Steel Welded Joints Suitable to Mooring Components

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