Investigating the Influence of the Power Supply Type upon the Properties of the Weld Joints under Manual Arc Welding

Il’yaschenko, Dmitriy P.; Chinakhov, Dmitry А.; Gotovschik, Y M

doi:10.4028/www.scientific.net/amr.1040.837

Cited by 15 publications

(13 citation statements)

References 3 publications

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“…Argon arc welding [27][28][29][30][31][32][33][34][35][36][37], which is currently used in repairs, is characterized by increased heat input in the welded parts and insufficient concentration of the heat source, compared to laser welding [38][39][40][41][42][43][44][45]. The shape coefficient of the weld (the ratio of the width of the weld to its depth of penetration) in argon arc welding is 2…4.…”

Section: Introductionmentioning

confidence: 99%

Research of Technology for Repair of Heat Exchangers of Nuclear Power Plants by Laser Welding

Bernatskyi

Sydorets

Berdnikova

et al. 2021

SSP

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Extending the lifetime of energy facilities is extremely important today. This is especially true of nuclear power plants, the closure (or modernization) of which poses enormous financial and environmental problems. High-quality repair of reactors can significantly extend their service life. One of the critical parts is heat exchangers, the tubes of which quite often fail. Sealing, as a type of repair of heat exchanger tubes by the plugs, is promising provided that the joint quality is high. Practical experience in the use of welding to solve this problem has shown the need to search technological solutions associated with increasing the depth of penetration and reducing the area of thermal effect. The aim of the work was to develop a highly efficient technology for repair and extension of service life of heat exchangers of nuclear power plants based on the results of studying the technological features of laser welding of joints of dissimilar austenitic steels AISI 321 and AISI 316Ti in the vertical spatial position. Based on the results of the analysis of mechanical test data, visual and radiographic control, impermeability tests and metallographic studies of welded joints, the appropriate modes of laser welding of plugs have been determined. The principal causes of defects during laser welding of annular welded joints of dissimilar stainless steels are determined and techniques for their elimination and prevention of their formation are proposed. Based on the results of the research, technological recommendations for laser welding of plugs in the heat exchange tube of the collector are formulated, which significantly improves the technology of repair of steam generators of nuclear power plants and extends the service life of reactors.

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Section: Introductionmentioning

confidence: 99%

Research of Technology for Repair of Heat Exchangers of Nuclear Power Plants by Laser Welding

Bernatskyi

Sydorets

Berdnikova

et al. 2021

SSP

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“…Carbon steels are a broad group of steels with a maximum carbon content of 1.7%, a manganese content of 65.6%, and a maximum of 0.6% silicon. There are no alloying elements such as chromium, nickel, molybdenum, etc., in these steels, or their amount is very small [4,5,6]. Specimen carbon steels can be divided into four groups:…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Fatigue Durability in Bending Effect on Welded Joints in Steel Profiles

Petrudi¹,

Kiasat²,

Fadavi³

et al. 2021

Metall Mater Eng

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Ships are always prone to fatigue through high periodic loads, usually caused by waves and changing load conditions. So, fatigue is an important factor in design. One of the reasons for fatigue in welding parts is variable bending loads. In this paper, a specimen of low-carbon steel T-Bar profiles is used, along with plates of the same type of steel that have been welded by the manual electrode welding process. To determine the distribution of static and dynamic forces created by welding, the specimens were subjected to bending (three-point loading) and tensile tests, and finally fatigue tests. The T-Bar Steel profile has more tolerance for fatigue loads than welded. The load T-Bar profile has not failed until the two million cycles, while the welding specimen has failed in about 3×105 cycles. Finally, strong penetrating welds should be used if a stronger welding joint is required.

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“…Such problems can be solved by using different welding technologies. Arc, plasma, resistance welding can be attributed to a number of processes that are relatively well studied [6,10,21,[25][26][27][31][32][33][34][35][36][37][38][39][40]. This statement applies both to the study of processes occurring in the weld pool [6,32,36,40], as well as to revealing dependences on welding parameters of mechanical and operational characteristics of produced welded joints [6,10,11,21,27,31,[33][34][35][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

“…Arc, plasma, resistance welding can be attributed to a number of processes that are relatively well studied [6,10,21,[25][26][27][31][32][33][34][35][36][37][38][39][40]. This statement applies both to the study of processes occurring in the weld pool [6,32,36,40], as well as to revealing dependences on welding parameters of mechanical and operational characteristics of produced welded joints [6,10,11,21,27,31,[33][34][35][37][38][39]. However, laser welding [1,3,5,8,13,19,20,31,[41][42][43], as well as electron beam welding [22,23,25,30], combined and hybrid methods of welding…”

Section: Introductionmentioning

confidence: 99%

Pore Formation during Laser Welding in Different Spatial Positions

Bernatskyi

Sydorets

Berdnikova

et al. 2020

SSP

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The process of formation of pores, cavities and similar defects in welded joints of stainless steels and aluminum alloys, affecting their quality, directly depends on spatial weld position in laser welding. Reducing the angle of inclination from 90° to 0° during downhill and uphill welding of AISI 321 stainless steel in the pulse mode of laser generation leads to an increase in both the number of pores and their size. At the same time, defects in the form of pores are not observed in the continuous mode of laser generation. In laser welding of butt joints of AISI 321 steel, the flat and vertical weld positions are the most promising, as they provide the highest level of quality. In order to provide a stable formation of a high-quality butt joint of aluminum AMg6M alloy and to prevent the failure of laser equipment, the welding process should be carried out in a vertical uphill weld position.

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Investigating the Influence of the Power Supply Type upon the Properties of the Weld Joints under Manual Arc Welding

Cited by 15 publications

References 3 publications

Research of Technology for Repair of Heat Exchangers of Nuclear Power Plants by Laser Welding

Research of Technology for Repair of Heat Exchangers of Nuclear Power Plants by Laser Welding

Experimental Study of Fatigue Durability in Bending Effect on Welded Joints in Steel Profiles

Pore Formation during Laser Welding in Different Spatial Positions

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