Microstructure and Mechanical Properties of MAG Welded Joints of Hardox 400 Steels

ÇALIK A., UÇAR N.

Metal Science and Heat Treatment, vol.67, no.3-4, pp.264-268, 2025 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 67 Issue: 3-4
  • Publication Date: 2025
  • Doi Number: 10.1007/s11041-025-01157-y
  • Journal Name: Metal Science and Heat Treatment
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex
  • Page Numbers: pp.264-268
  • Keywords: hardness, Hardox steel (18KhGT), HAZ, impact energy, MAG welding, microstructure, tensile mechanical properties
  • Isparta University of Applied Sciences Affiliated: Yes

Abstract

The microstructure and mechanical properties of welded joints of Hardox 400 (18KhGT) steel obtained by MAG (metal active gas) welding are studied. Steel ER 120 SG (Mn3Ni2CrMo) welding wire with diameter 1.2 mm is used for the welding. Static tensile tests of the welded joints show that cracks occur outside the weld metal zone, and the tensile strength and the impact energy are higher compared to the base metal. The highest hardness of 407 HV is observed in the weld metal area mainly due to the presence of martensitic structure. Then the hardness decreases consistently in the direction to the heat-affected zone and the base metal.