Features of Multi-Electrode Submerged-Arc Welding in the Production of High-Strength Thick-Walled Pipes

Bortsov, A. N.; Шабалов, И. П.; Velichko, A. A.; Mentyukov, K. Yu.; Utkin, I. Yu.

doi:10.1007/s11015-013-9730-0

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…The studies of thermal processes on thick-walled parts (20-40 mm) [13,14] showed that the maximum Δmax (at a distance of 1/2 of the penetration depth from the surface) and the minimum (at the root of the seam) Δmin (mm) of HAZ dimensions are as follows linear energy Qп (kJ / mm) with optimal technology: Δmax = 0,79Qp + 0,9 (1.2)…”

Section: Resultsmentioning

confidence: 99%

Repair Ability of Low-Alloyed Steel Strength of K70 (X90) Class

Pryakhin

Sharapova

2020

KEM

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The article presents the results of studies of steel strength of K70 (X90) class. The investigated semi-finished products were graded by their repair ability (by the number of allowed repeated local heating of the material during repair). The gradation is made from the condition of the reduction of metal viscosity in the overheating zone, determined by the magnitude of the impact of Sharpy samples at the temperature of 40 °C below zero.

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Section: Resultsmentioning

confidence: 99%

Repair Ability of Low-Alloyed Steel Strength of K70 (X90) Class

Pryakhin

Sharapova

2020

KEM

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“…However, low heat input welding is associated with the formation of defects such as lack of fusion in the centre of the weld and, given the stringent specifications on weld bead width and height, it is not possible to reduce the heat input and obtain a sufficient quality of weld with conventional multiple electrode methods. This aspect has been detailed by Bortsov et al [7] who demonstrated a range of defects if high enough heat input is not reached for this type of welding.…”

Section: Introductionmentioning

confidence: 87%

The effect of the weld fusion zone shape on residual stress in submerged arc welding

Ishigami¹,

Roy

Walsh

et al. 2016

Int J Adv Manuf Technol

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A new multiple-electrode submerged arc welding technique has been developed that imparts improved fracture toughness properties in the heat affected zone, produces a narrower weld bead geometry, and can also be employed with lower heat inputs than conventional SAW. This study examines how the difference in the weld fusion zone profile affects residual stresses for weldments of API X70 steel made using the same consumable, heat input and restraint, varying only the shape of the weld fusion zone. The contour method and neutron diffraction have been employed to map and compare longitudinal and transverse residual stresses. Results show peak longitudinal stresses in the weld are within 50 MPa for both, and this is believed to be because they have the same heat input and hence similar heat affected zone size. By contrast, the peak stress in the transverse direction is 120 MPa lower for the new SAW technique. The reduction in transverse stress is attributed to a narrower fusion zone profile. The new SAW technique opens up the possibility of producing high quality narrower welds with lower heat input which could lead to significant reductions in residual stress.

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“…These attributes are bene cial for welding thick-walled plates [1,2]. To increase productivity, tandem submerged arc welding (TSAW) containing two or more electrodes has been developed for the welding procedure of line pipe to achieve a high deposition rate [3]. The use of multi-electrode TSAW may, however, result in an increase in overall heat input which affects the metallurgy/properties of the weld metal (WM) and heat-affected zone (HAZ), especially in the coarse grain heat affected zone (CGHAZ).…”

Section: Introductionmentioning

confidence: 99%

Parametric study of cold wire tandem submerged arc welding of heavy gauge X70 linepipe steel

Ren

Mohammadijoo²,

Wiskel³

et al. 2022

Preprint

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Cold wire tandem submerged arc welding (CWTSAW) has been developed to improve the productivity (i.e., deposition rate and travel speed), and to control the weld and heat-affected zone (HAZ) geometry and mechanical properties of heavy gauge pipe. A series of CWTSAW trials were conducted on thick-wall American Petroleum Institute (API) X70 steel plates to investigate the effect of cold wire feed speed (CWFS), heat input (HI) and bevel design (BD) on the resulting geometry (e.g., height of reinforcement area (HRA), bead toe angle (BTA) and coarse grain heat-affected zone (CGHAZ) area) and micro-hardness of the weld and HAZ. The phase fraction of martensite-austenite (MA) constituents was measured using optical microscopy (OM) and scanning electron microscopy (SEM). Vickers micro-hardness measurements were taken of the weld metal and across the HAZ. The geometry and hardness measurements were statistically correlated with the weld parameters using Taguchi methodology. The results showed that the weld bevel design (BD) was the dominant factor influencing the HRA, CGHAZ area and BTA. Cold wire feed speed (CWFS) had a strong influence on the micro-hardness and phase fraction of MA constituents in the CGHAZ.

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Features of Multi-Electrode Submerged-Arc Welding in the Production of High-Strength Thick-Walled Pipes

Cited by 7 publications

References 1 publication

Repair Ability of Low-Alloyed Steel Strength of K70 (X90) Class

Repair Ability of Low-Alloyed Steel Strength of K70 (X90) Class

The effect of the weld fusion zone shape on residual stress in submerged arc welding

Parametric study of cold wire tandem submerged arc welding of heavy gauge X70 linepipe steel

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