scholarly journals Effect of microstructure on corrosion-mechanical endurance of welded joints of aluminium alloy V1341T produced by manual argon-arc welding

2021 ◽  
Vol 49 (2) ◽  
pp. 374-383
Author(s):  
Lyudmila Nyrkova ◽  
Svetlana Osadchuk ◽  
Tetiana Labur ◽  
Maria Yavorska
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Fracture Resistance ◽  
Welded Joint ◽  
Simultaneous Action ◽  
Alloying System ◽  
Different Types ◽  
Microstructure Effect ◽  
Change Of Microstructure ◽  
Continuous Loading

The results of microstructure effect on corrosion-mechanical endurance of 1.2 mm thick alloy of Al-Mg-Si-Cu alloying system and its welded joints, depending on their condition due to different types of HT are presented. Change of microstructure of the welded joints during performance of various HT operations practically does not affect its resistance against intergranular and exfoliating corrosion. Effect of HT on corrosion-mechanical endurance of welded joint under the conditions of simultaneous action of continuous loading and corrosive environment is ambiguous. Resistance against intergranular corrosion and corrosion cracking will determine the fracture resistance of welded products of V1341T alloy in service.

scholarly journals The influence of manual metal arc multiple repair welding of long operated waterwall on the structure and hardness of the heat affected zone of welded joints

2017 ◽  
Vol 62 (1) ◽  
pp. 327-333 ◽  
Author(s):  
J. Pikuła ◽  
M. Łomozik ◽  
T. Pfeifer
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Arc Welding ◽  
Power Plants ◽  
Welded Joint ◽  
Weld Bead ◽  
Boiler Steel ◽  
Metallographic Examination ◽  
Metal Arc Welding ◽  
High Degree

Abstract Welded installations failures of power plants, which are often result from a high degree of wear, requires suitable repairs. In the case of cracks formed in the weld bead of waterwall, weld bead is removed and new welded joint is prepared. However, it is associated with consecutive thermal cycles, which affect properties of heat affected zone of welded joint. This study presents the influence of multiple manual metal arc welding associated with repair activities of long operated waterwall of boiler steel on properties of repair welded joints. The work contains the results of macro and microscopic metallographic examination as well as the results of hardness measurements.

scholarly journals Influence of welding method on microstructural creation of welded joints  

2011 ◽  
Vol 57 (Special Issue) ◽  
pp. S50-S56 ◽  
Author(s):  
P. Čičo ◽  
D. Kalincová ◽  
M. Kotus
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Welded Joint ◽  
Gas Metal Arc Welding ◽  
Structural Phase ◽  
Welding Parameters ◽  
Welding Method ◽  
Welding Technology ◽  
Metal Arc Welding

This paper is focused on the analysis of the welding technology influence on the microstructure production and quality of the welded joint. Steel of class STN 41 1375 was selected for the experiment, the samples were welded by arc welding including two methods: a manual one by coated electrode and gas metal arc welding method. Macro and microstructural analyses of the experimental welded joints confirmed that the welding parameters affected the welded joint structure in terms of the grain size and character of the structural phase.

Mechanical Properties of Welded Joints in Welding with Pulsed Arcs

2013 ◽  
Vol 379 ◽  
pp. 195-198 ◽  
Author(s):  
A.G. Krampit ◽  
N.Yu Krampit ◽  
M.A. Krampit
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Power Supply ◽  
Welded Joints ◽  
Arc Welding ◽  
Welded Joint ◽  
Pulsed Power ◽  
Pulsed Arc Welding ◽  
Pulsed Power Supply ◽  
Pulsed Arc

Research results of the weld chemical composition and mechanical properties at pulsed arc welding are discussed. It is established that the pulsed power supply favours mechanical properties of the welded joint.

Aging of the OT4-VT23, VT6-VT23, VT19-VT23 Titanium Welded Pairs

2021 ◽  
Vol 410 ◽  
pp. 318-323
Author(s):  
Anatoliy G. Illarionov ◽  
Olga A. Koemets ◽  
Stella V. Grib
Keyword(s):  
Titanium Alloys ◽  
Cross Section ◽  
Welded Joints ◽  
Arc Welding ◽  
Welded Joint ◽  
Metastable Phases ◽  
Tungsten Electrode ◽  
Vt23 Alloy ◽  
Smooth Change ◽  
Nonconsumable Tungsten Electrode

The structure, the phase composition and microhardness over the section of welded joints aged at 500 and 550 °C have been studied by means of structural and microdurometric analyzes. The welded joints of OT4-VT23, VT6-VT23 and VT19-VT23 titanium alloys pairs were obtained by the argon-arc welding with a nonconsumable tungsten electrode. It has been established that the aging at 500 °C for 8 hours promotes the decomposition of metastable phases (b, a”) which formed after welding in the welded joint of VT19-VT23 titanium alloys pair. The decomposition process leads to strengthening of the main zones of the welded joint (except for the parent metal of VT23 alloy) and provides a favorable smooth change of microhardness in the joint during the transition from one alloy to another. The aging at 500 and 550 °C during 8 hours of the welded joints of OT4-VT23, VT6-VT23 titanium alloys pairs also led to the development of the decomposition of metastable phases (b, a”, a’) in the weld and heat affected zones of the alloys being joined, but did not provide the required monotonic change in microhardness over the cross section of the joint.

The Influence of Pulsed Heat and Power Supply on the Structure and Properties of Welded Joint Metals and Surfaced Coatings

2015 ◽  
Vol 788 ◽  
pp. 259-266
Author(s):  
Yuriy N. Saraev ◽  
Valeriy P. Bezborodov ◽  
Evgenya A. Putilova
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Weld Metal ◽  
Power Supply ◽  
Welded Joints ◽  
Arc Welding ◽  
Structural Changes ◽  
Welded Joint ◽  
Structure And Properties ◽  
Pulsed Mode

We have investigated the influence of the modes of adaptive pulse-arc welding and surfacing on the structure and physical-mechanical properties of welded joints of steel 09Mn2Si and the surfaced composition of this steel coated with a modified powder material of chromium carbide with the submicrocrystalline structure. It is shown that the pulsed mode of welding and surfacing can improve the homogeneity of the structure of the welded joint of steel and a surfaced coating and reduce the grain size of metals in both of them. Structural changes lead to an increase in ductility and toughness of the weld metal.

Testing of Welded Joints between Pipes for Pressure Vessels Made of Hot Rolled Fine-Grained Steel P460NL1

2020 ◽  
Vol 1157 ◽  
pp. 15-20
Author(s):  
Miodrag Arsić ◽  
Srđan Bošnjak ◽  
Vencislav Grabulov ◽  
Mladen Mladenović ◽  
Zoran Savić
Keyword(s):  
Tensile Properties ◽  
Welded Joints ◽  
Arc Welding ◽  
Welded Joint ◽  
Welding Process ◽  
Pressure Vessels ◽  
Parent Material ◽  
Fine Grained ◽  
Hot Rolled ◽  
Material Standard

This paper contains results of tests performed in order to determine mechanical properties of steel P460NL1, used as filler material during the execution of welded joints. Arc welding of samples from which the specimens were taken was carried out through the application of welding process 111, because it is one of the processes for the execution of pipelines for pressure equipment. Microspecimens with diameter of Ø1,5 mm were tested in order to determine tensile properties of material taken from the heat-affected zone and weld metal, while specimens with diameter of Ø6 mm were tested in order to determine tensile properties of parent material. Standard Charpy V-notch specimens were used in order to determine impact energy. Results of metallographic tests which refer to the structure of a pipe welded joint are also presented.

Effect of reheating in multipass submerged-arc welding on delayed fracture resistance of rotor steel welded joints

2019 ◽  
Vol 2019 (3) ◽  
pp. 11-14
Author(s):  
V.Yu. Skulsky ◽  
◽  
S.I. Moravetsky ◽  
M.A. Nimko ◽  
Yu.G. Pashchenko ◽  
...  
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Fracture Resistance ◽  
Submerged Arc Welding ◽  
Rotor Steel ◽  
Delayed Fracture ◽  
Submerged Arc

To the Question of Determining the Plasticity Zones of a Welded Joint of Large Diameter Pipes

2015 ◽  
Vol 763 ◽  
pp. 92-96
Author(s):  
Yuriy Ivanovich Pashkov ◽  
Mikhail Alekhsandrovich Ivanov ◽  
Yuriy Viktorovich Bezgans ◽  
Tatyana Vladimirovna Bezgans
Keyword(s):  
Plastic Deformation ◽  
Welded Joints ◽  
Arc Welding ◽  
Welded Joint ◽  
Large Diameter ◽  
Hydraulic Press ◽  
Welding Wire ◽  
Pipe Joints ◽  
Large Diameter Pipes ◽  
Welded Pipe

There was performed the analysis of a set of methodical solutions for determining of current and limit plasticity of welded joint zones at large diameter pipes. To determine the current plastic deformation of zones of pipes' welded joints it is offered to test the natural ring of a height of 80 mm, of a pipe with size 530x7,5 mm made of steel 17GS, welded by arc welding using a welding wire SV-08HM under a layer of flux AN-60. The ring samples are tested in the cone, the constructive dimensions of which match the cone used on the expander by the definite value of broadening on the hydraulic press with the force not less than 500 tons. The results of tests of ring samples of welded pipe with size 530х7,5 mm while their broadening by the cone. To determine the limit of plastic deformation of zones of a welded joint of large diameter pipes a method for testing a flat sample is proposed. The construction of the sample and the scheme of loading to determine the limit plasticity of welded pipe joints are proposed.

Effect of reheating in multipass submerged-arc welding on delayed fracture resistance of rotor steel welded joints

2019 ◽  
Vol 2019 (3) ◽  
pp. 18-22
Author(s):  
V.Yu. Skulsky ◽  
◽  
S.I. Moravetsky ◽  
M.A. Nimko ◽  
Yu.G. Pashchenko ◽  
...  
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Fracture Resistance ◽  
Submerged Arc Welding ◽  
Rotor Steel ◽  
Delayed Fracture ◽  
Submerged Arc

scholarly journals The Combined Welding of Advanced Steel P460NL2 mod. Used in Railway Tanks

2020 ◽  
pp. 25-35
Author(s):  
Janusz Adamiec ◽  
Michał Urbańczyk ◽  
Katarzyna Głowik ◽  
Michał Boryczka ◽  
Michał Majzner
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Welded Joint ◽  
Mag Welding ◽  
Test Results ◽  
Maximum Hardness ◽  
Technological Parameters

There have been presented test results of welding P460NL2 mod. steel in two configurations: combined laser + arc welding and hybrid laser + MAG welding, with various geometry of the joints. There have been assumed requirements for the joints (strength, toughness and hardness) specified in VdTUV 531 act and in PN-EN ISO 15614-1, PN-EN ISO 15614-11 i PN-EN ISO 15614-14 Standards. As a supplement there have been conducted macroscopic metallographic tests. Proper technological parameters of hybrid and combined welding enable to obtain properly formed butt-welded joints. Hybrid welded joints do not meet requirements of the standards, due to exceeded maximum hardness (over 380 HV10). However, combined welding provides obtaining proper welded joint with maximum hardness 360 HV10, strength 665 MPa and toughness over 27 J. The results above meet the technological requirements. Obtained test results are the guidelines for developing the technology possible to adapt in industrial conditions.

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