Investigation of welded structures on mechanical properties of 304L welded tube-to-tubesheet joints

Wei, Xinlong; Ling, Xiang

doi:10.1016/j.engfailanal.2015.03.003

Cited by 20 publications

(5 citation statements)

References 12 publications

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“…Therefore, in this paper Kalman filter is selected to accurately estimate the scale factor. In the scale estimation, the Kalman recursive formula is shown in formula (9).…”

Section: Map Optimisationmentioning

confidence: 99%

“…During the model building process, the distance D C between the camera and the tubesheet could be calculated according to formula (13), and then the scale factor S could be calculated according to formula (8)- (9). The value of D L and d during the process was recorded, as shown in Figure 9.…”

Section: Tubesheet Mapping Experimentsmentioning

confidence: 99%

“…However, it has seriously hampered the development of the industry due to its low degree of automation [3]. Plenty of research has been conducted on tube-totubesheet weldings, such as corrosion resistance of weld seams [4][5][6], weld seam residual stress [7], welding process monitoring [8], and production process [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Construction of a semi‐dense point cloud model for a tube‐to‐tubesheet welding robot

Wang

Rong

Liu

et al. 2022

IET Collab Intel Manufact

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Tube‐to‐tubesheet welding is widely applied in industrial fields. However, the current tubesheet welding robot still mainly relies on manual tubesheet models. Aiming to solve this problem, this paper proposed an improved direct method to automatically establish a tubesheet semi‐dense point cloud model based on a selected monocular camera and a one‐dimension (1D) laser rangefinder. Firstly, a laser filtering method was designed to acquire the distance between the camera and tubesheet through the 1D laser rangefinder. Then, from combing the 1D laser rangefinder data with keyframe data, the scale factor was obtained and proceeded to be processed by the Kalman filter to reduce the error. Then, the computed scale factor and all the keyframes were calculated to construct the tubesheet point cloud model through the graph optimisation algorithm. The experimental results showed that the semi‐dense point cloud model of the tubesheet could be efficiently established by the proposed algorithm with row error and column error both less than 1 mm, satisfying the welding requirements.

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“…Therefore, in this paper Kalman filter is selected to accurately estimate the scale factor. In the scale estimation, the Kalman recursive formula is shown in formula (9).…”

Section: Map Optimisationmentioning

confidence: 99%

Section: Tubesheet Mapping Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Construction of a semi‐dense point cloud model for a tube‐to‐tubesheet welding robot

Wang

Rong

Liu

et al. 2022

IET Collab Intel Manufact

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“…For welded joints, several types of recommended configurations (structures) of the joint can be found in [ 6 ]. Wei and Ling [ 7 ] experimentally assessed the effects of different welded configurations on mechanical properties of tube-to-tubesheet joints. Farrahi et al [ 8 ] also examined two types of tube-to-tubesheet welded joints in heat exchangers of a petrochemical unit.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Tube-to-Tubesheet Welding in Carbon Steel Heat Exchangers of a Double Plate Header Box

González¹,

Hernández‐Ortega

Jiménez

et al. 2021

Materials

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The rear wall of the header box serves as a tubesheet in heat exchangers of double plate header box. Tube-to-tubesheet welding must be performed using orbital Gas Tungsten Arc Welding (GTAW) with a head extension, which is passed through the corresponding hole in the front wall (plugsheet) of the header box, where the welding machine is supported. In this project, the effect of parallelism deviations between the plugsheet and the tubesheet of carbon steel header box is analyzed to evaluate its influence on the quality of the tube-to-tubesheet welding. Welded tube (SA-210 Gr. A1) to tubesheet (SA-516 Gr. 70) coupons are manufactured simulating the parallelism deviations previously analyzed in two double plate header boxes of air-cooled heat exchangers using two different preheating temperatures. Macrographic analysis is performed in order to evaluate the weld penetration (minimum leak path) and length of the weld leg in tube-to-tubesheet joints. The results obtained show important variations in those parameters when the parallelism deviations are equal to or greater than −1 mm over the theoretical distance as well as when the distance approaches +1 mm or more. Finally, the incorporation of dimensional controls prior to the welding process is discussed and the implementation of improvements in orbital GTAW equipment is recommended as an optimal solution for this kind of heat exchangers.

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“…Thus, Tube-to-tubesheet welded joints become a weak part in such heat exchangers [3]. During the last several decades, a number of failures of the tube-to-tubesheet welded joint in the shell-tube heat exchangers were investigated [4][5][6][7][8][9]. However, failures of such welded joints are far from being eradicated completely and need to be further considered.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of tube-to-tubesheet welded joints in a shell-tube heat exchanger

Liu

Ding

Shi

et al. 2016

Case Studies in Engineering Failure Analysis

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Investigation of welded structures on mechanical properties of 304L welded tube-to-tubesheet joints

Cited by 20 publications

References 12 publications

Construction of a semi‐dense point cloud model for a tube‐to‐tubesheet welding robot

Construction of a semi‐dense point cloud model for a tube‐to‐tubesheet welding robot

Analysis of Tube-to-Tubesheet Welding in Carbon Steel Heat Exchangers of a Double Plate Header Box

Failure analysis of tube-to-tubesheet welded joints in a shell-tube heat exchanger

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