Investigation of the weldability of AISI 430 and HARDOX 500 steels by CMT method

In this study, AISI-430 and HARDOX 500 steels were welded with Cold Metal Transfer (CMT) welding technique, and the changes in the mechanical properties in the welding and HAZ (Heat Affected Zone) regions were investigated. 100x130x6 mm AISI 430 and HARDOX 500 steels were cut in standard sizes with a band saw and joined by the CMT method using AWS 307 additional wire. The mechanical properties and microstructural changes of the welded areas were investigated by various analyses, microhardness, notch impact, and tensile tests, and the ruptured surfaces of the test specimens after the tensile test were investigated by SEM analysis. Welding was carried out at 140 A, 130 A, and 120 A current. 97.5% Argon and 2.5% CO2 gas were used as shielding gas. It has been determined that there are differences in morphology from the optical images after welding. Coarse grains were formed in the HAZ regions but were limited to the low -temperature input of the CMT welding. According to the EDS analysis results, it has been determined that there are atomic transitions between the regions. In the hardness analysis, there was a slight decrease in hardness in the HAZ regions compared to the base metals. In the tensile test, all 3 samples broke from the AISI 430 main material part. Elongation amounts were measured between 16.81 and 17.90 mm, and tensile strengths were measured between 417 and 441 MPa. As a result of the study, it has been revealed that the mechanical properties of AISI 430 and HARDOX 500 steels combined with CMT Welding have increased significantly in the weld zone and weldability is possible.

Journal

PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI

Year

2024

Volume

30

Issue

3

Pages

293-301

ISSN

1300-7009

eISSN

2147-5881

DOI

10.5505/pajes.2023.45020

WoS UID

WOS:001248187100001