Local dry underwater welding of 304 stainless steel based on a microdrain cover

Han, Leigang; Wu, Xiaohu; Chen, Guodong; Wang, Zhenmin; Fan, Weijun

doi:10.1016/j.jmatprotec.2018.12.029

Cited by 33 publications

(14 citation statements)

References 8 publications

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“…In this method, the welder is in the water, but the areas of welding and joint are isolated from the environment by a small chamber, in which the welding gas removes the water outside. This phenomenon produces conditions similar to the hyperbaric dry welding but does not require building any expensive chamber [20,21]. The last is the most popular and the cheapest method of underwater welding which is known as wet welding.…”

Section: Introductionmentioning

confidence: 98%

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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Section: Introductionmentioning

confidence: 98%

Dissimilar underwater wet welding of HSLA steels

Tomków

Fydrych

2020

Int J Adv Manuf Technol

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“…This method uses small chambers to isolate the area of the joint from water. However, the welder is located in the water and has contact with the environment [3]. The most common used method is wet welding, which is carried without any protective chambers.…”

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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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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“…Also, the elongation of samples without imperfections is similar. Underwater welding generates brittle microstructures such as martensite and bainite in the HAZ [27][28][29][30]. These structures are characterized by higher mechanical properties than structures generated during welding in the air.…”

Section: Static Tensile Testmentioning

confidence: 99%

“…Local cavity welding was proposed for the underwater process for stainless steel. Han et al [29] proposed metal inert gas (MIG) welding with wire located in the microdrain cover. The investigations showed that the method could be used for cladding layers on the surface of AISI 304 steel.…”

Section: Introductionmentioning

confidence: 99%

Underwater Local Cavity Welding of S460N Steel

et al. 2020

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In this paper, a comparison of the mechanical properties of high-strength low-alloy S460N steel welded joints is presented. The welded joints were made by the gas metal arc welding (GMAW) process in the air environment and water, by the local cavity welding method. Welded joints were tested following the EN ISO 15614-1:2017 standard. After welding, the non-destructive—visual, penetrant, radiographic, and ultrasonic (phased array) tests were performed. In the next step, the destructive tests, as static tensile-, bending-, impact- metallographic (macroscopic and microscopic) tests, and Vickers HV10 measurements were made. The influence of weld porosity on the mechanical properties of the tested joints was also assessed. The performed tests showed that the tensile strength of the joints manufactured in water (567 MPa) could be similar to the air welded joint (570 MPa). The standard deviations from the measurements were—47 MPa in water and 33 MPa in the air. However, it was also stated that in the case of a complex state of stress, for example, bending, torsional and tensile stresses, the welding imperfections (e.g., pores) significantly decrease the properties of the welded joint. In areas characterized by porosity the tensile strength decreased to 503 MPa. Significant differences were observed for bending tests. During the bending of the underwater welded joint, a smaller bending angle broke the specimen than was the case during the air welded joint bending. Also, the toughness and hardness of joints obtained in both environments were different. The minimum toughness for specimens welded in water was 49 J (in the area characterized by high porosity) and in the air it was 125 J (with a standard deviation of 23 J). The hardness in the heat-affected zone (HAZ) for the underwater joint in the non-tempered area was above 400 HV10 (with a standard deviation of 37 HV10) and for the air joint below 300 HV10 (with a standard deviation of 17 HV10). The performed investigations showed the behavior of S460N steel, which is characterized by a high value of carbon equivalent (CeIIW) 0.464%, during local cavity welding.

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Local dry underwater welding of 304 stainless steel based on a microdrain cover

Cited by 33 publications

References 8 publications

Dissimilar underwater wet welding of HSLA steels

Dissimilar underwater wet welding of HSLA steels

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

Underwater Local Cavity Welding of S460N Steel

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