X-Ray Radiography of Micro-alloyed Steel Joined by Submerged Arc Welding

Submerged arc welding is widely used in pipeline manufacturing due to higher efficiency as compared to the other welding processes. In present study, TiO2-SiO2-CaO and SiO2-CaO-Al2O3–based submerged arc welding fluxes were developed for joining of linepipe steel. Twenty-one fluxes were formulated based on mixture design methodology. Fluxes were analysed using X-ray florescence (XRF), thermogravimetric, differential-scanning calorimetry, Hot-disc and X-ray diffraction (XRD) techniques. The structural behaviour of rutile basic fluxes were analysed using Fourier transformed infrared spectroscopy (FTIR). Thermo-gravimetric analysis and differential scanning calorimetry were performed from 25 ℃ to 900 ℃ in order to determine the thermal stability and change in enthalpy of fluxes. Thermal conductivity, thermal diffusivity and specific heat of each flux were evaluated by hot disc technique. The density and grain fineness number for flux particles was evaluated at room temperature. Multi objective optimisation was performed to derive the optimised flux formulations. Individual effect of all the mixture constituents is rarely observed on the physicochemical properties of fluxes as compared to the binary and ternary mixture effects. The binary compositions significantly affect the density. TiO2-CaO is the most effective binary mixture which has increasing effect on density while all remaining binary mixture constituents have decreasing effect. The weight loss of fluxes observed during thermogravimetric analysis is affected by binary and ternary mixture constituents. Both binary and ternary flux mixtures affect change in enthalpy observed during differential scanning calorimetry. SiO2.Al2O3 is the only most effective binary mixture constituent of flux having increasing effect on thermal conductivity. Binary mixture constituents TiO2.CaF2, SiO2.Al2O3 and CaO.Al2O3 are the most effective and having synergistic effect on thermal diffusivity.

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Estudo de revestimentos de liga de níquel aplicados por soldagem em aço API 5L Gr B

Revista Principia - Divulgação Científica e Tecnológica do IFPB ◽

10.18265/1517-03062015v1n43p212-221 ◽

2018 ◽

Vol 1 (43) ◽

pp. 212

Author(s):

Marcos Mesquita da Silva ◽

Gabrielly Santana Cardoso ◽

Theophilo Moura Maciel ◽

Marco Antonio dos Santos ◽

Renato Alexandre Costa de Santana ◽

...

Keyword(s):

Corrosion Resistance ◽

Arc Welding ◽

Oil And Gas ◽

Filler Metal ◽

Submerged Arc Welding ◽

X Ray ◽

Ni Alloy ◽

Oil And Gas Sector ◽

Submerged Arc ◽

Resistance Tests

<p>The aim of this study was to evaluate different weld coatings of Ni alloy applied by the process of submerged arc welding (SAW) on API 5L Gr B steel used in the Oil and Gas Sector. The weldings were made with an AWS ERNiCrMo-4 filler metal of 1,14mm-diameter and an agglomerated, basic fluoride and non-alloying flux. Three weld coatings were made, two of them with pulsed and one with conventional current. Then, these weld coatings were characterized according to microhardness, optical microscopy, Energy-dispersive X-ray spectroscopy (EDX) and corrosion resistance tests. The results showed that the coating applied with conventional current presented lower dilution levels, higher width and height, and higher corrosion resistance when compared to the coatings applied with pulsed current</p>

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High speed X-ray observation of digital controlled submerged arc welding phenomena

Science and Technology of Welding & Joining ◽

10.1080/13621718.2021.1908746 ◽

2021 ◽

pp. 1-9

Author(s):

Yohei Abe ◽

Takahiro Fujimoto ◽

Mitsuyoshi Nakatani ◽

Hisaya Komen ◽

Masaya Shigeta ◽

...

Keyword(s):

Arc Welding ◽

High Speed ◽

Submerged Arc Welding ◽

X Ray ◽

Submerged Arc

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Tic Particle Reinforced Iron Based Composite Coating by Submerged-Arc Welding Added Alloy Powder

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.1657 ◽

2010 ◽

Vol 97-101 ◽

pp. 1657-1660

Author(s):

Jun Bo Liu ◽

Li Mei Wang ◽

Jun Hai Liu

Keyword(s):

Composite Coating ◽

Arc Welding ◽

Submerged Arc Welding ◽

X Ray Diffraction ◽

X Ray ◽

The Matrix ◽

Tic Particle ◽

Iron Based ◽

Submerged Arc

TiC particle reinforced iron based composite coating were in situ synthesized on surface of Q235 steel by Submerged-arc Welding (SAW) using the mixture consisted of ferrotitanium, ferrochromium, iron and carbon powders. Microstructure of the coating was observed by scanning electron microscope（SEM）and X-ray diffraction(XRD). Microhardness was measured by microhardness tester. Results indicated that the fine TiC particles were formed by using SAW process and dispersed in the matrix. And the particles sizes were less than 2μm. Microstructure of coating consists of TiC particles, martensite and austenite. The microhardness of coating is HV575~HV617, which is about 3 times of that of the based metal.

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Microstructure and Wear-Resisting Property of Submerged-Arc Welding Fe-Cr-C Ceramic Coating Added Alloy Powder

Materials Science Forum ◽

10.4028/www.scientific.net/msf.675-677.789 ◽

2011 ◽

Vol 675-677 ◽

pp. 789-793

Author(s):

Jun Bo Liu ◽

Li Mei Wang ◽

Jun Sheng Jiang

Keyword(s):

Composite Coating ◽

Arc Welding ◽

Alloy Powder ◽

Welding Process ◽

Submerged Arc Welding ◽

Dry Sliding Wear ◽

Wear Properties ◽

X Ray ◽

Q235 Steel ◽

Submerged Arc

Fe-Cr-C ceramic composite coating was fabricated on substrate of Q235 steel by submerged-arc welding process added alloy powder using the material of chromium powder, iron powder, colloid graphite powder and H08 welding wire. Microstructure and wear properties of the composite coating were investigated by means of X-ray diffraction (XRD), scanning electron micrograph (SEM), energy dispersive X-ray analysis (EDS) and microhardness tester. wearresisting property of the coating was tested at room temperature and dry sliding wear conditions. Results show that the composite coating consists of (Cr,Fe)7C3 eutectic phase and austenite. There are many dendrite crystal structure in the coating, and most of the dendrite crystal are parallel, pointing to the surface of the coating. The wear mass loss of the base body Q235 steel is 10 times higher as that of the composite coating. The coating has excellent wear-resisting property because there are many eutectic carbide (Cr,Fe)7C3. It can increase wear resisting property of the coating that the austenite could occurr strain and induced martensite in the coating during wear.

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