Volume 7, 2020
Special Issue – Advanced Joining Processes
|Number of page(s)||15|
|Published online||27 January 2020|
Weldability of S700MC steel welded with the hybrid plasma + MAG method
Warsaw University of Technology, Institute of Manufacturing Technologies, 85 Narbutta Str., 02-524 Warsaw, Poland
2 SUPRA ELCO, 3 Gimnazjalna Str., 01-364 Warsaw, Poland
* e-mail: firstname.lastname@example.org
Accepted: 3 January 2020
The paper describes the microstructure of welded joints produced by the plasma+MAG (Metal Active Gas) method of S700MC high yield strength steel (700 MPa). Welded joints of thermomechanical steel have been made with different values of heat input. The results of metallographic research of welded joints, microstructure of the weld and heat affected zone, hardness distribution and impact toughness are presented. The heat affected zone consists of two sub-zones with different grain size and lowered hardness. The tensile test show that strength of welded joints was slightly reduced and the bending test revealed no crack formation in the weld. The impact toughness of measured welded samples with V-notch in HAZ (heat affected zone) reached high values that are higher comparing to samples with notch placed in the weld area. The investigation results show that the use of plasma concentrated heat source together with MAG welding arc does not significantly change the structure and deteriorate properties of welded S700MC thermomechanically treated high strength steel. The hybrid plasma+MAG welding method has a potential to become a beneficial alternative to other welding processes due to its high efficiency, reduced amount of weld metal content or limited requirements for a preparation of edges of welded joints.
Key words: Plasma+MAG / hybrid welding / high strength steel / S700MC
© B. Skowrońska et al., Published by EDP Sciences 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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