<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and uncertainty about the effects of alloying elements, such as molybdenum, mechanical and visco-plastic properties, as well as metallographic component joints. All this indicates the need for a systematic study of these problems for the development of rational metallurgical and technological measures to significantly improve the technological and corrosion-mechanical properties of weld metal. Metallographic studies, using laboratory equipment with high identifying ability, found that the doping of weld metal with molybdenum in the amount of 0.2-0.4% causes fragmentation of ferrite-pearlite structure, including carbides Mn and Fe, and also reduces the number and size of non-metallic inclusions – sulfides, oxides and silicates. Moreover, non-metallic inclusions have a dispersed appearance, which promotes plasticization of the structure, which directly increases the viscous-plastic characteristics and resistance of the metal joints to crack formation. Based on the results of metallographic research, the optimum content in the weld metal of the alloyed element – molybdenum, which is 0.2-0.4%, is determined.</p>
</abstract>

Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and uncertainty about the effects of alloying elements, such as molybdenum, mechanical and visco-plastic properties, as well as metallographic component joints. All this indicates the need for a systematic study of these problems for the development of rational metallurgical and technological measures to significantly improve the technological and corrosion-mechanical properties of weld metal. Metallographic studies, using laboratory equipment with high identifying ability, found that the doping of weld metal with molybdenum in the amount of 0.2-0.4% causes fragmentation of ferrite-pearlite structure, including carbides Mn and Fe, and also reduces the number and size of non-metallic inclusions – sulfides, oxides and silicates. Moreover, non-metallic inclusions have a dispersed appearance, which promotes plasticization of the structure, which directly increases the viscous-plastic characteristics and resistance of the metal joints to crack formation. Based on the results of metallographic research, the optimum content in the weld metal of the alloyed element – molybdenum, which is 0.2-0.4%, is determined.

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Poltava National Technical Yuri Kondratyuk University

Management Systems in Production Engineering

This work is licensed under the Creative Commons Attribution 4.0 International License.

{"article-title":"Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines"}

Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and...

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Online veröffentlicht: 14. Dez. 2021

Seitenbereich: 274 - 279

DOI: https://doi.org/10.2478/mspe-2021-0034

Schlüsselwörter
structure, fracture, corrosion, crystal lattice, non–metallic inclusions

© 2021 Iveta Pandova et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

Online veröffentlicht: 14. Dez. 2021

Seitenbereich: 274 - 279

DOI: https://doi.org/10.2478/mspe-2021-0034

Schlüsselwörterstructure, fracture, corrosion, crystal lattice, non–metallic inclusions

© 2021 Iveta Pandova et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Schlüsselwörter
structure, fracture, corrosion, crystal lattice, non–metallic inclusions