Abstract: A continuous welding method and device for a hybrid welding, a welded finished product and a train body. The method comprises: performing hybrid welding on a groove of a welding piece by coupling a laser and a variable polarity arc; wherein the defocusing distance of the laser is not less than a Rayleigh length of the laser. According to the method of the present disclosure, the power density of the laser on the surface of the welding piece is effectively reduced and the height-width-ratio of the weld seam is decreased, the diameter of the welding melted pore is increased, the voids caused by the collapse of the small pore in the welding melted pore can be effectively reduced, thereby solving the problem that the weld porosity is difficult to escape in the prior art, and reducing the generation of the pores, effectively improving welding stability and reliability, and improving the mechanical properties of the weld seams.

Abstract: An electric resistance spot welding device, comprising a pair of electrodes located on the same welding surface of an assembly to be welded. The assembly to be welded is provided with an axis of symmetry (6); the pair of electrodes are symmetrically disposed on two sides of the axis of symmetry; one end of each electrode has a special-shaped contact surface (20); the special-shaped contact surfaces are respectively offset in directions away from the axis of symmetry relative to the electrode axis, wherein the special-shaped contact surfaces are used for offsetting a current density centerline (21) formed by the electrodes in a direction away from the axis of symmetry relative to the electrode axis (11), and/or used for deflecting the tendency of the current density of each electrode away from a welding face within the assembly to be welded.

Abstract: A laser stitch welding device, comprising: a laser welding assembly (3) configured to release laser beams from a front surface onto plates (5) to be welded that are stacked; a pressing piece (2) for adjusting a spacing between the stacked plates; detecting assembly for detecting a welding parameter of the stacked plates from a back surface; and a controller (1) for adjusting in real time the pressing level of the pressing piece (2) and/or operation parameters of the laser welding assembly (3) based on the welding parameter detected by the detecting assembly. The laser stitch welding device is capable of detecting in real time welding parameters such as back surface temperature and thermal infrared image of welding seams (6) when welding the plates. A control system controls the pressing level of the pressing piece or the operation parameters of the laser welding assembly based on the welding parameters to adjust the welding in a timely manner, thus achieving adaptive and stable control of weld penetration.

Abstract: A labeling method is provided. In the method, target image data of a target image is acquired from an offline storage device. The target image data is encrypted based on a first target account. A permission to load the target image data is verified based on a second target account logged in to a labeling client. The target image is loaded in the labeling client in response to the permission to load the target image being verified when the second target account logged in to the labeling client matches the first target account. A label for the target image is received. Further, the label for the target image is transmitted to a server. The server is configured to store the label in association with the target image. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.

Abstract: A continuous welding method and device for a hybrid welding, a welded finished product and a train body. The method comprises: performing hybrid welding on a groove of a welding piece by coupling a laser and a variable polarity arc; wherein the defocusing distance of the laser is not less than a Rayleigh length of the laser. According to the method of the present disclosure, the power density of the laser on the surface of the welding piece is effectively reduced and the height-width-ratio of the weld seam is decreased, the diameter of the welding melted pore is increased, the voids caused by the collapse of the small pore in the welding melted pore can be effectively reduced, thereby solving the problem that the weld porosity is difficult to escape in the prior art, and reducing the generation of the pores, effectively improving welding stability and reliability, and improving the mechanical properties of the weld seams.

Abstract: A process method for improving the welding seam quality of laser lap welding, including: S100: performing laser welding simulation on a workpiece and determining heat source model parameters of the laser welding simulation; S200: performing, according to the heat source model parameters, welding simulation on the workpiece at different incident angles, so as to acquire first welding seam parameters corresponding to the different incident angles; and S300: when the first welding seam parameters fall within a preset range, determining the incident angles corresponding to the first welding seam parameters as actual laser incident angles. The method can improve the problem of unstable welding seam quality of laser lap welding.

Abstract: A beam structure includes a lower cover plate, an upper cover plate and two side web plates jointed between the upper cover plate and the lower cover plate; wherein the two side web plates are arranged perpendicularly to the upper cover plate and the lower cover plate, respectively, to form a hollow box-shaped structure; rib plates protruding outwardly with a plurality of plug heads are welded within the box-shaped structure; the plug heads are respectively plugged in the upper cover plate, the two side web plates and the lower cover plate, and each plugging joint is fixed by laser-MAG hybrid welding from outside of the box-shaped structure. The method includes: assembling two side web plates, rib plates and a lower cover plate on an upper cover plate to form a box-shaped structure; and welding each of joints from outside of the box-shaped structure by laser-MAG hybrid welding.

Abstract: A beam structure includes a lower cover plate, an upper cover plate and two side web plates jointed between the upper cover plate and the lower cover plate; wherein the two side web plates are arranged perpendicularly to the upper cover plate and the lower cover plate, respectively, to form a hollow box-shaped structure; rib plates protruding outwardly with a plurality of plug heads are welded within the box-shaped structure; the plug heads are respectively plugged in the upper cover plate, the two side web plates and the lower cover plate, and each plugging joint is fixed by laser-MAG hybrid welding from outside of the box-shaped structure. The method includes: assembling two side web plates, rib plates and a lower cover plate on an upper cover plate to form a box-shaped structure; and welding each of joints from outside of the box-shaped structure by laser-MAG hybrid welding.

Abstract: The invention discloses a separation type air conditioner and its installation method. The separation type air conditioner comprises an indoor unit, an outdoor unit and a refrigerant tube connecting the indoor unit and the outdoor unit. The indoor unit comprises an evaporator; a centrifugal fan disposed behind the evaporator, the centrifugal fan being placed immediately adjacent to the evaporator; a motor mounted at the center of the centrifugal fan; a water tray disposed below the evaporator; a housing and a panel. The panel abuts against a wall and is operationally connected with the housing when in use; the housing is adapted to be inserted into an opening formed in the wall; the centrifugal fan and motor are installed in said housing, and in a plane parallel to said wall; the size of the panel is larger than that of the portion of the housing to be inserted into the wall opening, and the panel is so sized as to be adapted to cover said wall opening.