Physical Nature of the Processes in Structure Forming, Phase and Chemical Composition of pipe Permanent Joints when MMA Welding

All-Russia Scientific and Practical Conference on Materials Treatment: Current Problems and Solutions

Il'Yaschenko, D.P.^1 ; Chinakhov, D.A.^1 ; Danilov, V.I.^1,2 ; Sadykov, I.D.^1

Yurga Institute of Technology, TPU Affiliate, Leningradskaya 26, Yurga

652055, Russia^1

Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Akademichesky, 2/4, Tomsk

634055, Russia^2

关键词: Chemical compositions;    Electrode metals;    Energy characteristics;    Experimental research;    Mathematical calculations;    Permanent joints;    Physical nature;    Structure formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/125/1/012010/pdf
DOI  :  10.1088/1757-899X/125/1/012010

来源: IOP

【 摘 要 】

The paper outlines peculiarities of structure formation, phase and chemical composition in regard to heat content in molten electrode metal beads when pipe steel (steel 09G2S) welding using power sources with various energy characteristics. Mathematical calculations indicate an inverter power source provides minor heat content into the bead of electrode metal when welding. Experimental research has pointed at 4-9 % increase in impact strength of joints produced using an inverter power source in comparison with samples produced applying a diode rectifier. The following factors can possibly give rise to the increasing impact strength: difference in microstructures of weld joints, up to 50% shortening ferritic plates in metal of weld joint, change in dimensions of ferritic grains in the heat-affected zone by as much as 17.5 %, and decrease in the extent of heat-affected zone by 50%.