Development of a high-speed automatic welding process for simultaneous use on inside and outside surfaces of pipes

Fukuhara, Nobuhiko; Agusa, Kazuo; Ishii, H

doi:10.1080/09507119709452019

Cited by 2 publications

(2 citation statements)

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“…The linear energy used in the T-joint welding was calculated by the adaptive deposition method, and it was the minimal value to fulfill the groove. The T-joint to be welded was fixed on the welding bench, which could effectively control the welding deformation [29][30][31][32]. However, in the actual welding process, the linear energy increased because of the reduced root opening and the larger welding distortion, as shown in Figure 16.…”

Section: Welded Joint Deformationmentioning

confidence: 99%

Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding

Wang

Zhang

Yan

et al. 2021

Metals

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The T-joints of medium-thick 6082 Al-alloy plates created by dual pulsed gas metal arc welding (P-GMAW) and bilateral synchronous welding were investigated to improve weld quality using the adaptive deposition method, which calculates the minimum amount of deposition according to the welding condition, groove size, and cross-sectional area, effectively reducing the heat input and deformation of the welds on the basis of weld filling. The optimized linear energy with a wire feed speed (WFS) of 9.5 m/min can ensure a well-formed weld with a complete root fusion, and high-quality T-joint welds were obtained both in root openings of 0 mm and 1 mm. The biggest penetration was 4 mm, which was four times more than that of the result from a single torch welding process. When the distance between the two welding torches exceeded 20 mm, the molten pool was completely separated, and process pores were observed in the unfused root zone. Influenced by the thermal cycles in asymmetric welding, the hardness distribution changed: the width of the softer zone at the base plate with the fore arc was smaller than that zone with the rear arc. Furthermore, dual P-GMAW bilateral synchronous welding with an asymmetric heat source can further reduce the deformation of the welded joint by about 20% compared to that of symmetric welding.

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Section: Welded Joint Deformationmentioning

confidence: 99%

Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding

Wang

Zhang

Yan

et al. 2021

Metals

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“…An X-type groove was designed, and inside as well as outside of the pipe was welded, greatly improving the weld efficiency. The welding time for the new technology was increased by 65 min [16]. In the shipbuilding filed in Japan, multiple T-type joints were welded by robotic double-sided arc welding using double power supplies [17].…”

Section: Introductionmentioning

confidence: 99%

Thermal cycle and microstructure of backing weld in double-sided TIG arc horizontal welding of high-strength steel thick plate

Xiong

Liu

Zhang

2015

Int J Adv Manuf Technol

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Double-sided arc horizontal welding is a new process for high-strength steel thick plate. This study aims at studying thermal cycle and microstructure of backing weld. The special heating cycle with two peaks in double-sided double-arc welding is beneficial to the generation of microstructure with good strength and toughness, due to the effect of preheating and postheating. The microstructure was a mixture of ferrite and lath martensite. The heat-affected zone (HAZ) in the root area was overheated, owing to the shape of groove in the horizontal welding, resulting in meshes in the grain boundary. The meshes were analyzed to be the tempered martensite. Hardness tests showed that there were some softened regions in the HAZ on account of high-temperature tempering.

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Development of a high-speed automatic welding process for simultaneous use on inside and outside surfaces of pipes

Cited by 2 publications

References 0 publications

Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding

Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding

Thermal cycle and microstructure of backing weld in double-sided TIG arc horizontal welding of high-strength steel thick plate

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