Abstract: The present disclosure discloses a degassing-free underwater dissolved carbon dioxide detection device and a detection method. The degassing-free underwater dissolved carbon dioxide detection device includes a computer, which is used to provide the driving signal and controlling parameters for the power tuning unit; the computer is connected with a laser driving control module and the power tuning unit, respectively; the laser driving control module is connected with a laser; the laser is connected with a photo-isolator; the photo-isolator is connected with a thulium-doped fiber vertical-cavity laser system; the thulium-doped fiber vertical-cavity laser system is connected with a photoacoustic cell system through a fiber collimator; the photoacoustic cell system is connected with a pre-amplifier circuit and a lock-in amplifier in sequence, and the lock-in amplifier is connected with the computer.

Abstract: Disclosed is a three-dimensional printing method for instantly generating a needed molten raw material by way of a resistance heating function during three-dimensional printing. The method can realize three-dimensional printing of material having a high melting point and falls within the technical field of additive manufacturing. The method is characterized by applying a current through a solid raw material and a body to be printed; partially or fully heating the solid raw material located between a guiding device and said body to be printed into a molten state by way of resistance heating; and generating a molten raw material in a space located between the guiding device and the body to be printed.

Abstract: Disclosed is a three-dimensional printing method for instantly generating a needed molten raw material by way of a resistance heating function during three-dimensional printing. The method can realize three-dimensional printing of material having a high melting point and falls within the technical field of additive manufacturing. The method is characterized by applying a current through a solid raw material and a body to be printed; partially or fully heating the solid raw material located between a guiding device and said body to be printed into a molten state by way of resistance heating; and generating a molten raw material in a space located between the guiding device and the body to be printed.

Abstract: A method and apparatus for generating a molten raw material for three-dimensional printing, in which a solid raw material is heated to obtain the molten raw material. The solid raw material is heated to a molten state by electromagnetic induction outside the output end of the guiding device to form a molten segment. The molten segment is supported by the solid raw material and is not in contact with other structures after being in contact with the printed object and/or the support platform.

Abstract: The present invention discloses a droplet generating method for metal three-dimensional printing, and in a process of accumulating a liquid metal or softened flowable metal in a building process through metal three-dimensional printing, a metal flow is fragmentized to form metal droplets; wherein in the process of accumulating the liquid metal or softened flowable metal, a current is applied between the metal flow and a printed metal (7), through a manner of resistance heating, part of the metal flow is heated and gasified to fuse the metal flow, and the metal droplets are formed on the printed metal (7).

Abstract: The present invention discloses a droplet generating method for metal three-dimensional printing, and in a process of accumulating a liquid metal or softened flowable metal in a building process through metal three-dimensional printing, a metal flow is fragmentized to form metal droplets; wherein in the process of accumulating the liquid metal or softened flowable metal, a current is applied between the metal flow and a printed metal (7), through a manner of resistance heating, part of the metal flow is heated and gasified to fuse the metal flow, and the metal droplets are formed on the printed metal (7).

Abstract: A method and apparatus for generating a molten raw material for three-dimensional printing, in which a solid raw material (6, 15) is heated to obtain the molten raw material, wherein the solid raw material (6, 15) is heated to a molten state by electromagnetic induction at an output end (19, 21) of a guiding device (1, 10) and/or outside the output end (19, 21) of the guiding device (1, 10) and thus a molten segment (7, 9, 16) is formed; the molten segment (7, 9, 16) generated is only in contact with the solid raw material (6, 15) and is supported by the solid raw material (6, 15) before being in contact with a printed object (8, 17) and/or a support platform (4, 13); and the molten segment (7, 9, 16) generated is in contact with and supported by the solid raw material (6, 15), the printed object (8, 17) and/or the support platform (4, 13) and is not in contact with other structures after being in contact with the printed object (8, 17) and/or the support platform (4, 13); and the molten segment (7, 9, 16) is

Abstract: Disclosed is a method for spraying a liquid raw material for three-dimensional printing, in which a liquid raw material inside a flow channel is sprayed out of the flow channel, a liquid section or a droplet is formed outside the flow channel, the spraying process is controlled by a control circuit, and inside the flow channel, the liquid raw material is fully or partially connected to a gasification circuit, the liquid raw material which is connected to the gasification circuit has a region with a relatively high resistance (14), a current of a certain intensity is applied to the liquid raw material which is connected to the gasification circuit, the region with a relatively high resistance of the liquid raw material is fully or partially gasified, and an impact force generated through gasification is utilized to push the liquid raw material out of the flow channel, and thus the spraying of the liquid raw material is achieved.

Abstract: The invention discloses a method and an apparatus for metal three-dimensional printing, in which the method for metal three-dimensional printing comprises the following steps: molten or softened flowable metal is placed in a build area used by a three-dimensional printing device, after having no fluidity, the molten or softened flowable metal is converted into metal built by printing, the molten or softened flowable metal is accumulated on the basis of the metal built by printing, until an object to be printed is built, and the accumulated metal built by printing forms the object to be printed; the key characteristics are as follows: in the building process, the interlayer binding force and the binding force between pixel points are changed through a manner of resistance heating; and a printing area for implementing resistance heating can be set.