LASER APPARATUS USING OPTICAL FIBERS FOR STABLE LASER WELDING, AND LASER WELDING METHOD USING SAME

• Main Author: HANN, Swook
• Format: Patent
• Language: English; French; Korean
• Published: 10.03.2022
• Subjects: CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MACHINE TOOLS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The present invention relates to a laser apparatus using optical fibers for stable laser welding and a laser welding method using same. Hybrid ring mode-shaped laser beams, in which a central beam using fiber laser is positioned at the center of outer beams using diode laser, are used to perform welding by irradiating a to-be-welded portion of an object with the outer beams, the central beam, and the outer beams in this order. Thus, since the welding is performed using the central beam as a heat source in a state in which the to-be-welded portion of the object has been heated with a sufficient amount of heat input, the temperature gradient of the to-be-welded portion is low and solidification cracking does not occur. Also, problems such as spatter and voids can be minimized, and the laser welding is stable, and thus a quality of welding that is uniform and stable overall can be obtained. La présente invention concerne un appareil laser utilisant des fibres optiques pour soudage laser stable et un procédé de soudage laser utilisant celui-ci. Des faisceaux laser formés en mode d'anneau hybride, dans lesquels un faisceau central utilisant un laser à fibre est positionné au centre de faisceaux externes utilisant un laser à diode, sont utilisés pour effectuer un soudage par exposition d'une partie à souder d'un objet à un rayonnement avec les faisceaux externes, le faisceau central et les faisceaux externes dans cet ordre. Ainsi, comme le soudage est effectué en utilisant le faisceau central comme source de chaleur dans un état dans lequel la partie à souder de l'objet a été chauffée avec une quantité suffisante d'entrée de chaleur, le gradient de température de la partie à souder est faible et aucune fissure de solidification ne se forme. De plus, des problèmes tels que des projections et des vides peuvent être réduits au minimum et le soudage laser est stable et ainsi une qualité de soudage qui est uniforme et globalement stable peut être obtenue. 본 발명은 안정적인 레이저 용접용 광섬유를 이용한 레이저 장치 및 이를 이용한 레이저 용접 방법에 관한 것으로서, 다이오드 레이저를 이용한 외곽빔의 중심에 파이버 레이저를 이용한 중심빔이 위치하는 하이브리드 링 모드 형태의 레이저빔을 이용하여 대상물의 용접부에 외곽빔, 중심빔 및 외곽빔 순으로 조사되면서 용접이 진행되므로, 대상물의 용접부가 충분한 입열량으로 가열된 상태에서 중심빔의 열원으로 용접하기 때문에 용접부의 온도 구배율이 낮아 응고균열이 발생하지 않고, 스패터 및 기공 등의 문제가 최소화될 수 있으며, 레이저 공정이 안정되어 전체적으로 균일하고 안정된 용접 품질을 제공할 수 있다.