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Influence of Shielding Gas Mixture Type on Ultimate Tensile Strength of Laser-Welded Joints in Duplex Stainless Steel 2205

AUTORI:

NIKOLA KNEZOVIĆ;

Angela Topić;

ZNANSTVENA PODRUČJA
SADRŽAJ
During the laser welding of duplex stainless steel, shielding gases are inevitable. Their main goal is the protection of the molten metal and heat-affected zone from the effect of the surrounding atmosphere, but they also have other tasks to fulfil in order to obtain the best possible quality of the welded joint. Usually, the gases which are used are argon, nitrogen, helium and their mixtures. The experiment was carried out according to the experimental model with these gases and their mixtures. Base material was duplex stainless steel 2205 (W. Nr. 1.4462). The analysis revealed that the impact of the shielding gas mixtures on the ultimate tensile strength was not significant since all the specimens have shown similar results. However, it is important to emphasize that all specimens have high ultimate tensile strength (comparing with the requirements of appropriate standards). It is probably due to excessive ferrite content in the weld metal and it should not be a problem by itself, but it could be an indication of poor impact toughness. Considering that, toughness testing is the suggestion for future experiments and researches.
SADRŽAJ (eng)
During the laser welding of duplex stainless steel, shielding gases are inevitable. Their main goal is the protection of the molten metal and heat-affected zone from the effect of the surrounding atmosphere, but they also have other tasks to fulfil in order to obtain the best possible quality of the welded joint. Usually, the gases which are used are argon, nitrogen, helium and their mixtures. The experiment was carried out according to the experimental model with these gases and their mixtures. Base material was duplex stainless steel 2205 (W. Nr. 1.4462). The analysis revealed that the impact of the shielding gas mixtures on the ultimate tensile strength was not significant since all the specimens have shown similar results. However, it is important to emphasize that all specimens have high ultimate tensile strength (comparing with the requirements of appropriate standards). It is probably due to excessive ferrite content in the weld metal and it should not be a problem by itself, but it could be an indication of poor impact toughness. Considering that, toughness testing is the suggestion for future experiments and researches.
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