Increasing Strength and Operational Reliability of Fixed Joints of Tubes by MMA Welding

Il’yaschenko, Dmitriy P.; Chinakhov, D. A.; Данилов, В. И.; Schlyakhova, G V; Gotovschik, Y M

doi:10.1088/1757-899x/91/1/012007

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…To summarize the mentioned above nano-and ultra-disperse powders are used generally in welding of low-carbon and low-alloyed construction steels because there is no information available on the influence of these powders on corrosion and wear resistance etc [44][45][46].…”

Section: Results Of the Research And Their Discussionmentioning

confidence: 99%

The Current State of Application of Ultra- and Nanostructured Powders in Technologies in Welding Technologies (Review)

Kuznetsov

Zernin

2018

MSF

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Section: Results Of the Research And Their Discussionmentioning

confidence: 99%

The Current State of Application of Ultra- and Nanostructured Powders in Technologies in Welding Technologies (Review)

Kuznetsov

Zernin

2018

MSF

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“…They are used in critical designation structures (arms of cranes, concrete mixers, high-pressure pipelines, offshore structures etc.) [1][2][3][4][5][6][7][8][9]. Particular attention in manufacture of such metal structures is given to production of the quality welded joints as well as providing safety and service life of these structures under extreme operation conditions [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Structure and Crack Resistance of N-A-XTRA-70 Steel Joints Manufactured by Hybrid Laser-Arc Welding

Pozniakov

Markashova

Berdnikova

et al. 2018

MSF

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Crack resistance of welded joints is one of the most important indices of service reliability of critical designation structures. The purpose of the research is the establishment of the influence of technological modes, hybrid laser-arc welding of high strength steel NA-XTRA-70 on the formation of structure in the metal welded joints, as well as analysis of the influence of this structure on their crack resistances. For the experiments the laboratory setup has been developed on which the experiments were carried out in the technological scheme that provides the location of the consumable electrode arc at a certain distance in front of the laser beam in the welding direction. Nd: YAG-laser DY 044 of company ROFIN (Germany) was a laser radiation source. Power for consumable electrode arc was carried out by welding generator PSG-500. Investigations of structural-phase changes in weld metal and HAZ were carried out by means of optical microscopy (optical microscope Versamet-2 and Neophot-32), microhardness was measured using M-400 gage of Leco company at 0.98N loading. Fractographic investigations were carried out by scanning electron microscopy (scanning electron microscope SEM-515 of PHILIPS company, Netherlands) on fractured specimens of welded joints, made as a result of impact bend tests. An analysis of crack resistance of the welded joints was carried out under different conditions of test temperatures. It was based on experimental data, received by a quantitative fractography method. It is shown that metal of a welded joint produced by hybrid laser-arc welding at Vw = 72m/h rate has mainly failure of ductile nature after external loading. This indicates sufficient level of crack resistance and further working capacity under operation conditions.

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“…It should also be noted that one of the ways to influence the transfer of drops and to increase the electrode melting productivity, as well as the weld formation, is the gas dynamic effect of the jet at the welding [6,7]. As shown in [8,9], the structural components of weld metal are important for improving the strength characteristics. Besides in a number of publications, it is shown that the transverse magnetic field (TMF) use also allows to obtain the above-mentioned positive effects.…”

Section: Introductionmentioning

confidence: 99%

TMF Influence on Weld Structure at the Welding of 12X18H9T

Razmyshlyaev

Ahieieva

Lavrova

2018

MSF

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The transverse magnetic field (TMF) use allows to obtain follow effects: increasing the electrode melting coefficient, reducing the base metal penetration depth and grinding the weld metal structural components. The paper analyzed the existing literature data about the TMF influence on the refinement of the weld metal structure. It is experimentally shown that the alternating TMF influence of 6 Hz frequency reduces the grain size of weld metal is almost twice in comparison with the welding process without the TMF influence at submerged arc welding of plates of austenitic steel type 12X18H9T (X10CrNiTi18-9). The average grains size is 7-6 index, when welding without the TMF influence and the average grains size of the weld metal corresponds to 8 index, with separate inclusions of grains with 7 index when welding with the TMF influence. This is should increase the yield strength value of the weld metal in accordance with the data of Hall – Petch.

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Increasing Strength and Operational Reliability of Fixed Joints of Tubes by MMA Welding

Cited by 4 publications

References 4 publications

The Current State of Application of Ultra- and Nanostructured Powders in Technologies in Welding Technologies (Review)

The Current State of Application of Ultra- and Nanostructured Powders in Technologies in Welding Technologies (Review)

Structure and Crack Resistance of N-A-XTRA-70 Steel Joints Manufactured by Hybrid Laser-Arc Welding

TMF Influence on Weld Structure at the Welding of 12X18H9T

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