Publication detail
The Effect of Arc Current on Microstructure and Mechanical Properties of Hybrid LasTIG Welds of High-Strength Low-Alloy Steels
ŠEBESTOVÁ, H. HORNÍK, P. MRŇA, L. DOLEŽAL, P. MIKMEKOVÁ, E.
English title
The Effect of Arc Current on Microstructure and Mechanical Properties of Hybrid LasTIG Welds of High-Strength Low-Alloy Steels
Type
journal article in Web of Science
Language
en
Original abstract
A hybrid laser-tungsten inert gas (LasTIG) welding system was applied for 3-mm-thick S460MC and S700MC high-strength low-alloy steel sheet butt welding with the aim to reduce the cooling rate compared with laser welding. The effect of the electric current was evaluated. Increasing arc current led to the increase of fused metal and heat-affected-zone (HAZ) dimensions. Fused metal grains were larger whereas the microhardness increase toward the base metal was lower at higher currents in this region. Microhardness peaks corresponding to the coarse-grained HAZ were reduced at higher currents for S460MC but were almost not affected in S700MC. The tensile strength of both the laser weld and LasTIG welds was comparable to the base metal for both alloys.
English abstract
A hybrid laser-tungsten inert gas (LasTIG) welding system was applied for 3-mm-thick S460MC and S700MC high-strength low-alloy steel sheet butt welding with the aim to reduce the cooling rate compared with laser welding. The effect of the electric current was evaluated. Increasing arc current led to the increase of fused metal and heat-affected-zone (HAZ) dimensions. Fused metal grains were larger whereas the microhardness increase toward the base metal was lower at higher currents in this region. Microhardness peaks corresponding to the coarse-grained HAZ were reduced at higher currents for S460MC but were almost not affected in S700MC. The tensile strength of both the laser weld and LasTIG welds was comparable to the base metal for both alloys.
Keywords in English
Heat affected zone, High strength alloys, High strength steel, Inert gases, Metals, Microhardness, Steel metallurgy, Steel structures, Tensile strength, Welding
Released
17.04.2018
Publisher
Springer US
ISSN
1073-5615
Volume
49
Number
6
Pages from–to
3559–3569
Pages count
11
BIBTEX
@article{BUT155510,
author="Hana {Šebestová} and Petr {Horník} and Libor {Mrňa} and Pavel {Doležal} and Eliška {Materna Mikmeková},
title="The Effect of Arc Current on Microstructure and Mechanical Properties of Hybrid LasTIG Welds of High-Strength Low-Alloy Steels",
year="2018",
volume="49",
number="6",
month="April",
pages="3559--3569",
publisher="Springer US",
issn="1073-5615"
}