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Einfluss von Schutzgasen auf die lokalen mechanischen Eigenschaften von Laserstrahlschweißnähten an Vergütungsstählen
Author(s) -
Bauer B.,
Kralj S.,
Kožuh Z.,
Dorn L.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100774
Subject(s) - welding , shielding gas , materials science , argon , composite material , electromagnetic shielding , joint (building) , laser beam welding , metallurgy , heat affected zone , laser , outgassing , chemistry , structural engineering , optics , organic chemistry , physics , engineering
Small additions of oxygen or carbon dioxide to argon shielding at laser beam welding can increase welding speed and productivity and decrease the mechanical properties of welded joints. The effect of the type of active shielding gas mixtures based on argon with additions of oxygen and/or carbon dioxide upon the local mechanical properties of laser welded joints of heat‐treatable steel 25 CrMo 4 was studied. Microshear test method has been used to investigate the local mechanical properties of welded joints, including microshear strength, microshear plasticity and microshear thoughness. The obtained data were statistically processed, and a mathematical modeling of mechanical properties applying the method of response surfaces was carried out. The analysis revealed that the impact of the used shielding gas mixtures upon the local mechanical properties of the joint is not very significant. The results indicate that the microshear test can be used successfully for estimation of the local mechanical properties distribution of laser welded joints.