1. bookVolume 29 (2021): Edizione 4 (December 2021)
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License
Formato
Rivista
eISSN
2450-5781
Prima pubblicazione
30 Mar 2017
Frequenza di pubblicazione
4 volte all'anno
Lingue
Inglese
access type Accesso libero

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

Pubblicato online: 14 Dec 2021
Volume & Edizione: Volume 29 (2021) - Edizione 4 (December 2021)
Pagine: 274 - 279
Dettagli della rivista
License
Formato
Rivista
eISSN
2450-5781
Prima pubblicazione
30 Mar 2017
Frequenza di pubblicazione
4 volte all'anno
Lingue
Inglese
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.

Keywords

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