Abstract
The aim of this paper is to present a welding process connected with micro-jet cooling. This method allowed us to guide the metallographic structure, and furthermore, the properties of the weld metal deposit. The main conclusion of this paper was that after welding with micro-jet cooling, it was possible to achieve beneficial metallographic structures that are impossible to obtain in any other way. These structures corresponded to very good mechanical properties of the welds. The research results described the influence of an artificially enhanced amount of acicular ferrite in the weld metal deposit (WMD) even above 65% when using micro-jet cooling. The results of this process were very positive due to the very high impact toughness of welds at negative temperature. The main parameters of micro-jet cooling are: cooling stream diameter (about 60 µm), gas pressure (about 0.6 MPa), the use of various gases and gas mixtures (main micro-jet gases: argon, helium, nitrogen, carbon dioxide, oxygen, air).
Highlights
The welding production process in particular metallurgical companies is dependent on many factors, and new techniques and materials for steel welding are still tested
Chemical composition can first be treated as a main factor influencing the impact toughness and strength of the weld metal deposit (WMD), and very often in the deflection of long structures
Micro-jet cooling technology can be considered as an innovative way to steer metallographic structure just after steel welding
Summary
The welding production process in particular metallurgical companies is dependent on many factors, and new techniques and materials for steel welding are still tested. Properties of the weld metal deposit are dependent on many factors, including chemical composition, welding technology, filler materials, and state of stress. Chemical composition can first be treated as a main factor influencing the impact toughness and strength of the weld metal deposit (WMD), and very often in the deflection of long structures. Some alloy elements—especially nickel (in the range of 1–3%), molybdenum (in the range of 0.2–0.6%), and oxygen (below 500 ppm)—could be treated as factors that positively influence impact toughness [2,5]. The goal of this paper was to analyze the mechanical properties of the steel weld structures after using the innovative welding process based on micro-jet cooling. The mechanical properties of steel weld structures with micro-jet cooling were much better in comparison with the standard processes. This method saw a decrease in deflection
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