Study of physico-metallurgical peculiarities of wet arc welding of structural steels

Yushchenko, K. A.

doi:10.1533/9780857093165.6

Cited by 13 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the high thermal conductivity of water, the entire welding area cools down much faster in underwater wet welding, compared with a dry welding process. [ 2,3 ] Thus, hydrogen has significantly less time to leave the weld area by diffusion. The contents of diffusible hydrogen, which are measured after wet welding, range roughly from 26 to 100 ml/100‐g weld metal.…”

Section: Introductionmentioning

confidence: 99%

Control of the diffusible hydrogen content in different steel phases through the targeted use of different welding consumables in underwater wet welding

Klett

Mattos

Maier

et al. 2020

Materials & Corrosion

View full text Add to dashboard Cite

Due to the rising number of offshore structures all over the world, underwater wet welding has become increasingly relevant, mainly as a repair method. Welding in direct contact with water involves numerous challenges. A topic focused by many studies is the risk of hydrogen‐induced cracking in wet weldments due to hardness values of up to 500 HV 0.2 in the heat‐affected zone (HAZ) and high levels of diffusible hydrogen in the weld metal. The risk of cracking increases as the equivalent carbon content rises, because the potential to form martensitic structures within the HAZ rises too. Thus, high‐strength steels are especially prone to hydrogen‐induced cracking and are considered unsafe for underwater wet repair weldments.

show abstract

Section: Introductionmentioning

confidence: 99%

Control of the diffusible hydrogen content in different steel phases through the targeted use of different welding consumables in underwater wet welding

Klett

Mattos

Maier

et al. 2020

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…In the welding process, the HAZ is often the most sensitive part of a welded joint 36,37 . The heat input promotes grain growth, generating the appearance of coarse grains, as well as, in ferritic/pearlitic structural steels the formation of martensitic and bainitic phases.…”

Section: Electrochemical Analysismentioning

confidence: 99%

Corrosion behavior of austenitic stainless steel and nickel-based welded joints in underwater wet welding

Vaccari,

Scheithauer,

Lendiel

et al. 2024

npj Mater Degrad

View full text Add to dashboard Cite

Marine structures such as ports, bridges, pipelines, vessels, and platforms are an essential part of modern infrastructure, where the use of higher-strength steel provides savings in logistics and construction. However, the repair of higher-strength steels can be challenging, especially underwater. Wet shielded metal arc welding is the most widely used and least expensive method for underwater welding repairs, but is very susceptible to hydrogen-induced cracking. Thus, researchers and welding engineers aim to reduce the amount of hydrogen in the weld material. Recent success has been achieved through the use of austenitic welding consumables, such as austenitic stainless steel and nickel-based electrodes. The use of these consumables drastically reduces the amount of diffusible hydrogen in the weld metal. However, these austenitic materials usually have different corrosion potential as compared to the structural steel the weld beads are applied to. This creates the risk of severe galvanic corrosion. In the presented study, the corrosion behavior of welds created with austenitic stainless steel and nickel-based electrodes were studied. Samples were aged for 1.5 years in the Baltic Sea. Simultaneously, the effectiveness of corrosion protection systems such as coating and Impressed Current Cathodic Protection (ICCP) were evaluated. Localized corrosion occurred in the heat-affected zone when austenitic electrodes were used in the corrosive environment. The localized corrosion depth after 1.5 years in the Baltic Sea and in the salt spray layer was approximately 250 µm and 390 µm, respectively. The ICCP system and the use of a coating were effective in preventing localized corrosion. The low pitting corrosion density of 2.5 × 103 m−2 corresponds to grade A1 according to the standard and was found to be negligible as compared to the localized corrosion in the heat-affect zone.

show abstract

“…Due to the advantages of simple equipment, low cost and flexible operation, underwater wet welding (UWW) has gained the most extensive application in marine engineering [2]. It is well known that the arc burns in bubbles formed by the decomposition of water vapor at high temperatures during the UWW process [3]. The arc stability is affected by the dynamics of bubble formation and detachment [4].…”

Section: Introductionmentioning

confidence: 99%

Process Stability, Microstructure and Mechanical Properties of Underwater Submerged-Arc Welded Steel

Zhang

Han

Jia

et al. 2021

Metals

View full text Add to dashboard Cite

In underwater wet welding, the unstable welding process caused by the generation and rupture of bubbles and the chilling effect of water on the welding area result in low quality of welded joints, which makes it difficult to meet the practical application of marine engineering. To improve the process stability and joining quality, a mixture of welding flux with a water glass or epoxy resin was placed on the welding zone before underwater welding. In this paper, welds’ appearance, geometry statistics of welds’ formation, welding process stability, slag structure, microstructure, pores and mechanical properties were investigated. It was found that with the addition of water glass in the mixture, the penetration of weld was effectively increased, and the frequency of arc extinction was reduced. Though the porosity rose to a relatively high level, the joints’ comprehensive mechanical properties were not significantly improved. Notably, the applied epoxy resin completely isolated the surrounding water from the welding area, which greatly improved process stability. Furthermore, it benefited from the microstructure filled with massive acicular ferrite, the average elongation and room temperature impact toughness increased by 178.4%, and 69.1% compared with underwater wet welding, respectively, and the bending angle of the joint reaches to 180°.

show abstract

Study of physico-metallurgical peculiarities of wet arc welding of structural steels

Cited by 13 publications

References 2 publications

Control of the diffusible hydrogen content in different steel phases through the targeted use of different welding consumables in underwater wet welding

Control of the diffusible hydrogen content in different steel phases through the targeted use of different welding consumables in underwater wet welding

Corrosion behavior of austenitic stainless steel and nickel-based welded joints in underwater wet welding

Process Stability, Microstructure and Mechanical Properties of Underwater Submerged-Arc Welded Steel

Contact Info

Product

Resources

About