Effects of PTFE on operational characteristics and diffusible H and O contents of weld metal in underwater wet welding

Amaral, Erriston Campos; Uribe, Andrés Mauricio Moreno; Bracarense, Alexandre Queiróz

doi:10.1016/j.jmapro.2020.11.018

Cited by 20 publications

(4 citation statements)

References 20 publications

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“…Following this reasoning, hydrophobic substances are used for modification of welding wires and electrodes. Amaral et al [37] used polytetrafluoroethylene as a flux ingredient in underwater flux-cored arc pad welding. The experiment showed that the hydrophobic substance, as a part of the flux, decreases the diffusible hydrogen content in the deposited metal.…”

Section: Introductionmentioning

confidence: 99%

Weldability of Underwater Wet-Welded HSLA Steel: Effects of Electrode Hydrophobic Coatings

Tomków

2021

Materials

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The paper presents the effects of waterproof coatings use to cover electrodes on the weldability of high-strength, low-alloy (HSLA) steel in water. With the aim of improving the weldability of S460N HSLA steel in water, modifications of welding filler material were chosen. The surfaces of electrodes were covered by different hydrophobic substances. The aim of the controlled thermal severity (CTS) test was to check the influence of these substances on the HSLA steel weldability in the wet welding conditions. The visual test, metallographic tests, and hardness Vickers HV10 measurements were performed during investigations. The results proved that hydrophobic coatings can reduce the hardness of welded joints in the heat-affected zone by 40–50 HV10. Additionally, the number of cold cracks can be significantly reduced by application of waterproof coatings on the filler material. The obtained results showed that electrode hydrophobic coatings can be used to improve the weldability of HSLA steel in underwater conditions.

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Section: Introductionmentioning

confidence: 99%

Weldability of Underwater Wet-Welded HSLA Steel: Effects of Electrode Hydrophobic Coatings

Tomków

2021

Materials

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“…Es importante destacar que existen dos variantes de este proceso: un modo en que la protección necesaria para la ionización del arco eléctrico y la protección del charco de soldadura es generada por la fusión del propio fundente en el núcleo, denominado alambre tubular autoprotegido, y otro en que la protección es suministrada por un gas externo, generalmente CO2 [16]. Así, se evidencia la importancia de desarrollar alambre tubular autoprotegido principalmente en soldadura submarina húmeda, adicionando elementos de naturaleza química diversa, tal como se evidencia en la literatura [20], [21], [22], [23], [24].…”

Section: Introductionunclassified

Particularidades de la transferencia metálica y la aplicación de corriente pulsada en soldadura submarina

et al. 2022

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En este trabajo son expuestos los tipos de transferencia metálica presentes en soldadura a arco eléctrico con alambre tubular y las principales características de la técnica de corriente pulsada aplicada en soldadura submarina húmeda. Para esto, fue fundamental recopilar y analizar la información de diferentes investigaciones, condensadas en artículos de carácter técnico-científico. Este documento se divide en dos secciones: en un primer momento, se dilucida el efecto que tienen los parámetros y condiciones del proceso, sobre el tipo de transferencia de metal. Además, es presentada la aplicación de la corriente pulsada, y su efecto sobre el control del tamaño de las gotas de metal, así como su frecuencia y modo de desprendimiento desde el electrodo, hasta el charco de soldadura.

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“…In order to obtain high-quality underwater wet FCAW-S welded joints, the key is to develop a self-shielded flux-cored wire suitable for the wet welding process. However, the development of self-shielded flux-cored wire lags far behind the development of coated electrodes [15][16][17]. When commercial flux-cored wires were originally tried in underwater surroundings, the quality of the wet welds was poor [18,19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Process Stability and Weld Quality of Underwater Wet Flux-Cored Arc Welding of Low-Alloy High-Strength Steel with Oxy-Rutile Wire

Liu

et al. 2021

Polish Maritime Research

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The paper described the experimental findings of underwater wet welding of E40 steel using self-shielded flux-cored wire with a TiO2-FeO-MnO slag system. The arc stability, weld quality and corrosion resistance with different heat inputs were studied. The results showed that the wet welding process of the designed wire displayed good operability in the range of investigated parameters. The microstructure and mechanical properties of the weld metal depended on the heat input. Due to the high fraction of acicular ferrite in the weld metal, the mechanical properties of the weld metal under low heat input had better tensile strength and impact toughness. Fracture morphologies at low heat input had uniform and small dimples, which exhibited a ductile characteristic. The diffusible hydrogen content in the deposited metal obtained at a heat input of 26 kJ/cm significantly reduced to 14.6 ml/100g due to the combined effects of Fe2O3 addition and the slow solidification rate of molten metal. The microstructure also had a significant effect on the corrosion resistance of the weld metal. The weld metal with high proportions of acicular ferrite at low heat input exhibited the lowest corrosion rate, while the base metal possessed a reduced corrosion resistance. These results were helpful to promote the application of low alloy high strength steel in the marine fields.

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Effects of PTFE on operational characteristics and diffusible H and O contents of weld metal in underwater wet welding

Cited by 20 publications

References 20 publications

Weldability of Underwater Wet-Welded HSLA Steel: Effects of Electrode Hydrophobic Coatings

Weldability of Underwater Wet-Welded HSLA Steel: Effects of Electrode Hydrophobic Coatings

Particularidades de la transferencia metálica y la aplicación de corriente pulsada en soldadura submarina

Investigation of Process Stability and Weld Quality of Underwater Wet Flux-Cored Arc Welding of Low-Alloy High-Strength Steel with Oxy-Rutile Wire

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