Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method

Chen, Hao; Guo, Ning; Xu, Kexin; Liu, Cheng; Wang, Guodong

doi:10.3390/ma13061442

Cited by 19 publications

(14 citation statements)

References 33 publications

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“…The usage of paraffin wax caused hardness reducing by 20-40 HV10 in HAZ in comparison to electrode without additional hydrophobic layer and by 40-50 HV10 in comparison to underwater electrode. Expected hardness reducing in HAZ (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) was also observed in specimens welded with electrodes with concrete impregnate. The significant differences were found in the weld.…”

Section: Hardness Measurementsmentioning

confidence: 71%

“…The ways of preventing of the susceptibility to cold cracking of steels welded in the water are still widely investigated. Chen et al [32] and Wang et al [33] proposed ultrasonic-assisted welding, which improves the quality of underwater joints. Wang et al [34,35] proved also that external mechanical constraint caused improvement in stability of process, which affects the size of the bubble around the arc burning zone.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Electrode Waterproof Coating on Quality of Underwater Wet Welded Joints

Tomków

Fydrych

Wilk³

2020

Materials

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In this paper, the effects of different hydrophobic coatings on the surface of covered electrodes on the quality of wet welded carbon steel joints were discussed. Commonly available hydrophobic substances used in industrial applications were selected for the research. The aim of using waterproof coatings was to check the possibility to decreasing the susceptibility of high-strength low-alloy S460N steel to cold cracking. During experiments diffusible hydrogen content in deposited metal determination by mercury method, metallographic macro- and microscopic testing and hardness measurements were performed. Investigations showed that waterproof coatings laid on covered electrodes can improve the quality of wet welded joints, by decreasing the Vickers HV10 hardness in heat-affected zone and decreasing the diffusible hydrogen content in deposited metal, which minimalize possibility of cold cracking.

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Section: Hardness Measurementsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Effect of Electrode Waterproof Coating on Quality of Underwater Wet Welded Joints

Tomków

Fydrych

Wilk³

2020

Materials

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“…During wet welding, the welder and the welding area are in direct contact with the surrounding environment throughout the process. The most popular wet welding processes are flux-cored arc welding (FCAW) [22][23][24][25][26] and welding with the use of covered electrodes (MMA) [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Cold cracks can occur in the welds and in the heat-affected zone (HAZ) of the welded joints even 48 h after welding [32,33]. Welding in the water increases the number of cold cracks due to high cooling rate, which makes the HAZ brittle [22,23,27,30]. This can also generate higher residual stresses after welding.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar underwater wet welding of HSLA steels

Tomków

Fydrych

2020

Int J Adv Manuf Technol

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The high-strength low-alloy S460ML and S460N steels were chosen for underwater wet welding of dissimilar T-joints using covered electrodes. For improving the quality of joints, the temper bead welding (TBW) method was used. The application of TBW in pad welding conditions has been investigated earlier but the possibility of usage of this technique in welded joints was not analyzed. The main aim of the study was to check the influence of TBW on the hardness and structures of the heat-affected zone (HAZ) of dissimilar T-joints made in the underwater conditions. The experiments conducted showed that the technique used can reduce the susceptibility to cold cracking by decreasing the hardness in HAZ, which is a result of changes in its structure. The TBW technique reduced the hardness in the HAZ of the S460N steel by 40-50 HV10 and in S460ML by 80-100 HV10. It was also found that the changes in S460ML and S460N were much different, and therefore, the investigated technique can provide better results in the steel characterized by lower carbon equivalent Ce IIW .

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“…This resulted in an increase in hardness of over 8%, and an increase in tensile strength by almost 30%. The contact method of delivering ultrasonic vibrations in underwater welding in [27] also caused changes in mechanical properties. (increase in average hardness, toughness and tensile strength, grain refinement and reduction of the width of the boundaries between ferrite grains).…”

Section: Introductionmentioning

confidence: 99%

A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

et al. 2020

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The research described in this article presents a new contactless method of introducing mechanical vibrations into the base material during CO2 laser welding of low-carbon steel. The experimental procedure boiled down to subjecting a P235GH steel pipe with a 60 mm diameter, 3.2 mm wall thickness and 500 mm length to acoustic signals with a resonant frequency during the welding process. Acoustic vibrations with a frequency of 1385, 110 and 50 Hz were introduced into the pipe along the axis and transversely from the outer surface. The obtained welds were then subjected to structural tests and Vickers hardness measurements. The results of comparative tests show the impact of such introduced vibrations on the granular structure of the welds, as well as on their microhardness in specific areas, such as the face, penetration depth and the heat-affected zone. The effectiveness of the proposed method of introducing vibrations in the scope of grain size and shape as well as changes in the hardness distribution in the obtained welds is demonstrated.

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Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method

Cited by 19 publications

References 33 publications

Effect of Electrode Waterproof Coating on Quality of Underwater Wet Welded Joints

Effect of Electrode Waterproof Coating on Quality of Underwater Wet Welded Joints

Dissimilar underwater wet welding of HSLA steels

A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

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