Mechanical properties of underwater wet welded marine steel plates using different low hydrogen electrodes

Purnama, Dewin; Winarto, Winarto; Susilo, Ferdy Hendarto

doi:10.1063/1.5042935

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Part of the structure that works under water may need repair work. Amongst the three most important methods in water welding, i.e., wet method, dry chamber hyperbaric weld method, and coffer dam system method, the majority use the wet welding method, where the electric arc, as well as joints, are in direct interaction through water [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

et al. 2021

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Many methods have been used in the past two decades to detect crack damage in steel joints of the offshore structures, but the electromechanical impedance (EMI) method is a comparatively recent non-destructive method that can be used for quality monitoring of the weld in structural steel joints. The EMI method ensures the direct assessment, analysis and particularly the recognition of structural dynamics by acquiring its EM admittance signatures. This research paper first briefly introduces the theoretical background of the EMI method, followed by carrying out the experimental work in which damage in the form of a crack is simulated by using an impedance analyser at different distances. The EMI technique is used to identify the existence of damage in the welded steel joints of offshore steel jacket structures, and Q345B steel was chosen as the material for test in the present study. Sub-millimetre cracks were found in four typical welded steel joints on the jacket platform under circulating loads, and root average variance was used to assess the extent of the crack damage.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

et al. 2021

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“…Some of the parts of structures working in water environment may require repair works. Among three main methods of underwater welding, dry, local dry cavity and wet welding, the most common is wet welding, where the electric arc and the joint are with direct contact with water [8][9][10]. Wet welding could be carried out by using covered electrodes, flux cored wires and, more rarely, other welding processes [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Temper Bead Welding of S460N Steel in Wet Welding Conditions

Tomków

Fydrych

Łabanowski

2018

Advances in Materials Science

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Wet welding is the most common method of welding in water environment. It is most often used for repairing of underwater parts of offshore structures. However, the water as a welding environment causes an increase of susceptibility of steels to cold cracking. For underwater constructions high strength low alloy (HSLA) steel are widely used. In wet welding condition a HSLA steel is characterized by high susceptibility to cold cracking. Temper Bead Welding (TBW) was chosen as a method to improve the weldability of S460N steel. The studies showed that TBW technique causes significant decrease of maximum hardness of heat affected zone (HAZ). The largest decrease in hardness occurred in specimens with the pitches in range 66-100%.

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“…There are three key techniques of underwater welding, local dry cavity, wet welding and drying. The most commonly used form is the wet welding in which arcing and joints are in direct contact with water [66][67][68][69][70]. Wet welding can be done by using shielded electrodes, flux leather wires and also using few other welding procedures [71][72][73][74][75].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Monitoring of T-Type Joints in Steel Offshore Oil and Gas Jacket Platform

Ali

Khan

Bashmal

et al. 2021

Sensors

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Several approaches have been used in the past to predict fatigue crack growth rates in T-joints of the offshore structures, but there are relatively few cases of applying structural health monitoring during the non-destructive testing of jacket platforms. This paper presents an experimental method based on the sensing of the piezoelectric sensors and finite element analysis method for studying the fatigue cracks in the offshore steel jacket structure. Three types of joints are selected in the current research work: T-type plate, T-type tube-plate, and T-type tube joints. The finite element analysis model established in the current study computes and analyzes the high stress and high strain regions in the T-type joints. The fatigue damage in the T-type joints was successfully detected by utilizing both the finite element analysis and experimental methods. The results showed that fatigue cracks of the three types of joints are prone to appear at the weld toe and spread in the welding direction. The fatigue damage location of T-type plate and T-type tube-plate joints is more concentrated in the upper weld toe area, and the fatigue damage location of the T-type tube joint is closer to the lower weld toe area.

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Mechanical properties of underwater wet welded marine steel plates using different low hydrogen electrodes

Cited by 4 publications

References 4 publications

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

Temper Bead Welding of S460N Steel in Wet Welding Conditions

Fatigue Crack Monitoring of T-Type Joints in Steel Offshore Oil and Gas Jacket Platform

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