Abstract
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.
Highlights
Responsible metal structures of agricultural processing and food production, in particular factory and city thermal pipeline networks used for water supply and transportation of water-vapour mixtures for technological needs at enterprises, often work in extreme climatic-baric and stress-strain conditions, contacting during the term of operation corrosion-active products and environments
As the basis of pipeline construction is welding and installation work, which largely determines the reliability of the objects under construction, in the real pipeline structures the occurrence of cracks is most often due to the presence of welding connections
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
Summary
Responsible metal structures of agricultural processing and food production, in particular factory and city thermal pipeline networks used for water supply and transportation of water-vapour mixtures for technological needs at enterprises, often work in extreme climatic-baric and stress-strain conditions, contacting during the term of operation corrosion-active products and environments. Their destruction is accompanied by major material and environmental consequences, which cause significant damage to businesses. 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 fused metal
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