Abstract
High strength structural steels are in high demand thanks to their favorable mechanical properties. They offer high strength with sufficient toughness and good forming capabilities. Applications range from shipbuilding, to offshore constructions, cranes, and pipelines. A lot of current research focuses on weldability of high strength low alloy (HSLA) steels, especially improving the toughness in the weld zone, i.e., weld metal (WM) and heat affected zone (HAZ). In the present work, four different fusion welding processes using undermatching filler metal are compared on 8-mm thick sheets of S960MC structural steel. The welding processes include electron beam, laser hybrid, plasma, and gas metal arc welding. The welded joints are characterized by means of mechanical testing, tensile, impact, and hardness testing, and microstructural investigaton, light optical, and scanning electron microscopy. Furthermore, microprobe analysis of the weld metal was used to investigate the chemical composition of the weld metal.
Highlights
The use of high strength low alloyed (HSLA) structural steels, such as S960MC, is steadily increasing in engineeringRecommended for publication by Commission IX - Behaviour of Metals Subjected to Welding2 voestalpine Stahl GmbH, Linz, Austria 3 Department of Physical Metallurgy and Materials Testing, University of Leoben, Leoben, Austria 4 Fronius International GmbH, Wels, Austria industry
The filler metals play an important role in the welding of HSLA steels [15]
Guo et al [6] investigated gas metal arc welding of S960 HSLA steel using matching filler metal on 8-mm thick sheets. These joints exhibit better impact toughness in the weld metal compared to the laser welds but do not reach the necessary strength level since the welds broke in the soft heat affected zone (HAZ)
Summary
The use of high strength low alloyed (HSLA) structural steels, such as S960MC, is steadily increasing in engineering. Guo et al [5] were able to weld 8-mm thick sheets of S960 HSLA steel plates in a single pass using autogenous laser welding They obtained welds with sufficient strength but reduced toughness in the weld metal compared to the base material. Guo et al [6] investigated gas metal arc welding of S960 HSLA steel using matching filler metal on 8-mm thick sheets. These joints exhibit better impact toughness in the weld metal compared to the laser welds but do not reach the necessary strength level since the welds broke in the soft HAZ. V, Nb, Ti 0.14 reference GMA welds with matching filler metal (industrial standard)
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