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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Strength charactristics of hybrid LasTig welds of thermomechanically processed steel
 Šebestová, Hana ; Horník, Petr ; Mrňa, Libor
Thermomechanically processed steels achieve their high strength properties, while maintaining good ductility, thanks to their fine-grained structure assured by micro-alloying and strictly controlled process of rolling. Low heat input welding technologies are advisable. Nevertheless, high temperature gradients accompanying laser welding can lead to the brittle microstructures formation. The cooling rate can be controlled by preheating that we have realized with the heat of electric arc. Hybrid technology combining laser welding with tungsten inert gas (TIG) welding is referred to as LasTIG. The paper presents the effect of electric current that generates arc discharge on tensile strength, toughness, and fatigue life of LasTIG welds of S460MC and S700MC steels.
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Properties of hybrid LasTIG welds of of S460MC steel
 Šebestová, Hana ; Horník, Petr ; Mrňa, Libor
Modern structural high strength low alloy steels achieve their excellent strength properties through the microalloying and carefully controlled process of hot rolling. Welding technologies with low heat input are advisable to maintain fine-grained structure of these steels and to minimize heat distortions. Laser beam is a source of highly concentrated energy and thus very narrow heat affected zone is reached during laser welding. Unfortunately, undesirable quenching microstructures can be generated thanks to high heating and cooling rates in both weld metal and heat affected zone. Their amount can be reduced through the temperature rate decrease realized using preheating. Technology of LasTIG hybrid welding combines laser welding with the preheating by an electric arc. The contribution evaluates the effect of electric current on LasTIG weld macro and microstructure and microhardness.
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