Method for cutting steel member

According to the present invention, a method for cutting a steel member sprays oxide particles when gas-cutting a steel member to form a resolidification portion including oxide particles on a cut surface. Specifically, the melting point of the oxide particles is higher than the melting point of the...

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Bibliographische Detailangaben
Hauptverfasser:	YOO, JAE SEOK, JEON, YU CHUL, CHUNG, SUNG WOOK
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS SOLDERING OR UNSOLDERING SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	According to the present invention, a method for cutting a steel member sprays oxide particles when gas-cutting a steel member to form a resolidification portion including oxide particles on a cut surface. Specifically, the melting point of the oxide particles is higher than the melting point of the steel member. The oxide particles use at least one type of powder selected among Y_2O_3, MgO, Al_2O_3, Lu_2O_3, and HfO_2. The oxide particles use a particle size in a range of 5-20 microns. Accordingly, particle boundary growth is suppressed by oxides dispersed in a HAZ in proximity to a molten pool to reduce a CG-HAZ fraction. Consequently, degradation in mechanical properties (strength and toughness) of a welding part is prevented. 본 발명은 강재 절단 방법으로서, 강재의 가스 절단 시 산화물 입자를 분사하여 절단면에 산화물 입자가 포함된 재응고부를 형성시킨다. 세부적 구성으로서, 상기 산화물 입자의 융점은 강재의 융점보다 높고, 상기 산화물 입자는 YO, MgO, AlO, LuO, HfO중에서 선택되는 적어도 1종류의 분말을 사용하며, 상기 산화물 입자는 5~20 micron 범위의 입도를 사용하는 것을 특징으로 한다. 이에 따라, 용융지에 근접한 HAZ에서 분산된 산화물에 의해 입계 성장이 억제되어 CG-HAZ 분율이 감소하고, 그 결과 용접부의 기계적 물성(강도 및 인성) 저하가 방지되는 효과가 있다.