Naslov
Effects of type of shielding gas upon local mechanical properties of laser welded joint in heat-treatable steel

Autori
Bauer, Branko ; Kralj, Slobodan ; Kožuh, Zoran ; Dorn, Lutz

Izvornik
Materialwissenschaft und Werkstofftechnik (0933-5137) 42 (2011), 8; 718-726

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
laser welding; microshear test; heat-treatable steel; welded joint; shielding gas

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA