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Use of laser-TIG hybrid technology for boron-doped high-strength steels
Kachlíř, Jaromír ; Šebestová, Hana (referee) ; Mrňa, Libor (advisor)
This thesis deals with the usage of arc preheating for welding high strength boron enhanced steel 22MnB5 using hybrid technology known as laserTIG and also its impact on the final weld compared to welds welded by only the laser or the arc method. During the experiment I welded five sheets of the above mentioned steel 1,3 or 1,9 milimeters wide. Except for the welds fabricated by the laser and the TIG method was the only variable the electric current of the arc (I = 20, 40, or 60 A). Welds welded this way were compared based on strength limits measured by the tensile tests. Additionally were they compared according to the metalographic survey and the progress of weld hardness, calculated using the Vickers hardness test.
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Influence of Chemical Composition on Weldability of Structural Steels
Kachlíř, Jaromír ; Daněk, Ladislav (referee) ; Vaněk, Mojmír (advisor)
This work deals with the influence of chemical composition to weldability of construction steel S355, S275 and S235. The introduction is about marking steel according to norms EN 10027 and CSN 42 0002. It also marginally deals with the problematic of carbon equivalents, temperature of preheat and generation of martenzit during welding. The second half contains the evaluation of the examined steel samples. I focus mostly on mechanical properties, chemical composition and other steel charasteristics. All the samples are compared both to the other steels in its group and amongst each other.
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Use of laser-TIG hybrid technology for boron-doped high-strength steels
Kachlíř, Jaromír ; Šebestová, Hana (referee) ; Mrňa, Libor (advisor)
This thesis deals with the usage of arc preheating for welding high strength boron enhanced steel 22MnB5 using hybrid technology known as laserTIG and also its impact on the final weld compared to welds welded by only the laser or the arc method. During the experiment I welded five sheets of the above mentioned steel 1,3 or 1,9 milimeters wide. Except for the welds fabricated by the laser and the TIG method was the only variable the electric current of the arc (I = 20, 40, or 60 A). Welds welded this way were compared based on strength limits measured by the tensile tests. Additionally were they compared according to the metalographic survey and the progress of weld hardness, calculated using the Vickers hardness test.
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Influence of Chemical Composition on Weldability of Structural Steels
Kachlíř, Jaromír ; Daněk, Ladislav (referee) ; Vaněk, Mojmír (advisor)
This work deals with the influence of chemical composition to weldability of construction steel S355, S275 and S235. The introduction is about marking steel according to norms EN 10027 and CSN 42 0002. It also marginally deals with the problematic of carbon equivalents, temperature of preheat and generation of martenzit during welding. The second half contains the evaluation of the examined steel samples. I focus mostly on mechanical properties, chemical composition and other steel charasteristics. All the samples are compared both to the other steels in its group and amongst each other.
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