Experimental investigation of structural integrity behavior of High strength low alloy steel – Study of mechanical, microstructural and corrosion behavior of Submerged arc welding weldments

2020 ◽  
pp. 095440892095810
Author(s):  
Lochan Sharma ◽  
Rahul Chhibber
Keyword(s):  
Corrosion Resistance ◽  
Impact Strength ◽  
Weld Metal ◽  
Base Metal ◽  
Arc Welding ◽  
Weld Zone ◽  
Submerged Arc Welding ◽  
Welding Fluxes ◽  
Submerged Arc ◽  
Metal Impact

The present study aims at investigating the effect of submerged arc welding fluxes for enhanced corrosion resistance of structural steel welds. By varying the basicity index of submerged arc welding fluxes the corrosion resistance and mechanical properties of weld metal such as tensile strength, impact strength, microhardness in submerged arc weldments were evaluated. The result shows that with the increase in bascity index tensile strength of weld specimen reduced while impact strength and microhardness value increased. Maximum microhardness (288 HV) was observed for flux 2 while base metal show minimum microhardness value (205 HV). Flux 5 gives maximum impact strength (94.17 J) as compared to the base metal (80 J). This is due to the reduced content of oxygen in weld metal which increases the weld metal impact toughness. Corrosion resistance of weld specimen increased as compared to the base metal. Ductile fracture mode and shear lip or tears were observed in the weld zone. Shear dimples and shear lips were more severe in base metal as well as weld metal impact specimens due to the rapid effect of external forces on the impact test. The banded microstructure of delta ferrite and austenite was observed in the base metal. Fine grains of ferrite and pearlite at the center and edges were present in the weld zone.

scholarly journals Research of nanoscale titanium carbides influence on the structure and properties of weld metal in automatic submerged arc welding

2018 ◽  
Vol 226 ◽  
pp. 03029
Author(s):  
Nikolay V. Kobernik ◽  
Alexander S. Pankratov
Keyword(s):  
Titanium Carbide ◽  
Weld Metal ◽  
Weld Pool ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Structure And Properties ◽  
Cored Wire ◽  
Average Value ◽  
Submerged Arc ◽  
Primary Crystals

The influence of nanoscale refractory titanium carbide particles on the structure and properties of weld metal in automatic submerged arc welding is considered. Composite granules based on nickel were used to introduce the compound into the composition of the weld pool. Two schemes for introducing granules into the weld pool were tested, characterized by different temperature conditions: to the head part of the welding pool with the help of “ligature” and to the tail section with the help of additional filler wire. The prospects of introducing nano-sized titanium carbide into the tail part of the weld pool as part of a flux-cored wire are shown. With this method, the structure of the weld metal is observed to modify: the average size of the primary crystals of the weld metal is reduced by almost 50%. At the same time, the value of the toughness of the weld metal increases: the average value of this index increases by 36%. When titanium carbide is introduced as part of the “ligature” into the head of the weld pool, despite the effect of modifying (reducing the width of the primary crystals by 30%), the average value of the toughness of the weld metal decreases.

Design and development of submerged arc welding fluxes using TiO2-SiO2-CaO and SiO2-CaO-Al2O3 flux system

2018 ◽  
Vol 233 (4) ◽  
pp. 739-762 ◽  
Author(s):  
Lochan Sharma ◽  
Rahul Chhibber
Keyword(s):  
Thermal Conductivity ◽  
Differential Scanning Calorimetry ◽  
Binary Mixture ◽  
Arc Welding ◽  
Ternary Mixture ◽  
Submerged Arc Welding ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Welding Fluxes ◽  
Submerged Arc

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.

scholarly journals Erratum to: Modification of Weld Metal with Tungsten Carbide and Titanium Nitride Nanoparticles in Twin Submerged Arc Welding

2019 ◽  
Vol 53 (2) ◽  
pp. 176-176
Author(s):  
N. P. Aleshin ◽  
M. V. Grigor’ev ◽  
N. V. Kobernik ◽  
R. S. Mikheev ◽  
A. S. Pankratov ◽  
...  
Keyword(s):  
Weld Metal ◽  
Titanium Nitride ◽  
Tungsten Carbide ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Submerged Arc

Modification of Weld Metal with Tungsten Carbide and Titanium Nitride Nanoparticles in Twin Submerged Arc Welding

2018 ◽  
Vol 52 (5) ◽  
pp. 440-445
Author(s):  
N. P. Aleshin ◽  
M. V. Grigor’ev ◽  
N. V. Kobernik ◽  
R. S. Mikheev ◽  
A. S. Pankratov ◽  
...  
Keyword(s):  
Weld Metal ◽  
Titanium Nitride ◽  
Tungsten Carbide ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Submerged Arc

Study on the Organization and Mechanical Properties of Q345R Weld-Joint

2012 ◽  
Vol 562-564 ◽  
pp. 573-577
Author(s):  
Xiao Dong Hu ◽  
Yong Zhang ◽  
Jian Tao Lv ◽  
Sen Zhang
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Weld Seam ◽  
Weld Zone ◽  
Submerged Arc Welding ◽  
Butt Weld ◽  
Heat Treated ◽  
Metallurgical Structure ◽  
Submerged Arc ◽  
Better Than

The butt weld of Q345R with the thickness of 40mm has been manufactured with the submerged-arc welding (SAW). The mechanical properties of the weld seam have been tested and the metallurgical structures have been analyzed. Conclusions have been obtained as follows: the metallurgical structure of multi-layer butt weld is much more complicated than the monolayer ones; only the last weld layer has the obvious zones of weld zone, heat-affected zone (HAZ) and fusion area; the weld zone and the fusion area will be heat treated with the next layers weld finished; the mechanical property of the multi-layer butt weld is much better than the monolayer weld determined by the corresponding organization.

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