37 results about "Fusion width" patented technology

The invention discloses a determination method for heat source model parameters in multiplewire submerged-arc welding by numerical simulation. The determination method comprises the following steps of: determining a heat-flow density distribution function in the multiplewire submerged-arc welding process; initially determining the heat source model parameters, wherein the heat source model parameters to be determined includes Ui, Ii, v, n, taui, etai, alphai, f<fi>, bi, ci, a<fi>, and a<bi>; and finally determining a heat-source model, wherein the determined parameters are substituted into the heat-flow density distribution function q(x, y, z, t) which is then taken as a thermology boundary condition for repeated iterative computations by a numerical simulation tool, the computation result of iterative computation of each time is compared with the shape of a joint fusion pool obtained by actual welding, the heat-source model parameters bi, ci, a<fi>, a<bi> are gradually adjusted by a range of 5% according to the comparison results until the errors between the parameters of the fusion depth and the fusion width of a simulated fusion pool and the fusion depth and the fusion width of the actual joint fusion pool are smaller than 10%, and then the determination of the heat-source model parameters in the multiplewire submerged-arc welding is finished.

The invention relates to a non-intrinsic fiber - Perot cavity production methods and devices, it belongs to fiber sensing technology .Its feature is that using the divide amplitude method to produce three equal intensity of CO2 laser beam, using reflecting mirror group to form the inter-120 degree intersecting beams in the plane, the intersection angle of three light beam can do fine adjustment to ensure that three beam intensity is balance. Each of the three light beams use cylindrical lens focus , made quartz capillary and fiber produce about 120 microns uniform circular welding in the fusion location. The use of laser pulse frequency is 20-24 KHz, through adjusting laser pulse parameters to control laser energy that exposure to quartz capillary. The effectiveness and benefits of the invention is the whole quartz structure of the non- Intrinsic fiber-Perot cavity fusion width and stress is uniform in the angle, bending small, reliable sealing. As the temperature / pressure sensor applications, it found minimal hysteretic error, it can achieve high measurement precision, and it has important value in the temperature, pressure and strain measurement of the harsh environment.

The invention provides a method and system for establishing a related model for welding process parameters and welding bead forming parameters. The method comprises the steps: carrying out a welding test by adopting a CO2 gas shielded welding method, and obtaining welding bead forming parameters under different welding process parameters; preliminarily establishing quadratic regression equations of weld bead weld width, excess weld metal and weld joint cross section area with respect to welding current and welding speed based on a quadratic general rotation regression analysis method; carryingout parameter optimization to obtain a quadratic regression equation of the inspected weld bead weld width, excess weld height and weld joint cross section area with respect to welding current and welding speed; and carrying out inverse coding on the regression equation to obtain a correlation model of the CO2 gas shielded welding bead forming parameter welding bead fusion width, the excess weldmetal and the welding seam cross section area after inverse coding as well as the welding current and the welding speed of the welding process parameters. Through the model, not only can welding process parameters for forming the required welding bead be determined, but also welding bead forming parameters can be determined according to the welding process parameters.

The invention relates to the technical field of welding quality control, in particular to a plasma arc welding current fusion width control system based on a fuzzy inference-neural network. The systemcomprises an upper computer, a plasma arc welding controller, a welding seam tracking sensor, a welding gun and a welding seam tracking control interface, wherein the upper computer is connected withthe plasma arc welding controller through a human-machine interactive interface; the output end of the plasma arc welding controller is connected with the welding seam tracking sensor and the weldinggun; the welding seam tracking sensor and the welding gun are installed on a sliding table; the welding seam tracking sensor is connected with the input end of the plasma arc welding controller through the welding seam tracking control interface; and the welding seam tracking sensor corresponds to a weldment, and the welding gun corresponds to the weldment through a welding head. The welding seamtracking sensor detects whether the width of a melting pool has a deviation or not in real time from a visual area, and a detection signal is transmitted to the plasma arc welding controller throughthe welding seam tracking control interface, so that the width deviation of the melting pool is reduced, and the welding quality is improved.

A laser-assisted active welding method, which aims to increase welding fusion depth in the absence of active agent, comprises the following steps: fusing the surface of welding beads to be welded by a laser beam under protection of oxygen; and welding the welding beads pre-processed by laser by common welding method. The selected laser beam is a small-power laser beam with a power range of 5 to 100 W. The welding bead fused by the laser has a fusion width less than or equal to 1 mm and a fusion width less than or equal to 2 mm.

The invention discloses a welding system and method for battery sealing nails, and relates to the field of battery laser welding. The welding system comprises a galvanometer, a fiber laser and an airblowing device, wherein the galvanometer is arranged right above the air blowing device and is connected with the fiber laser through an optical fiber. The method comprises the steps that the galvanometer is arranged right above a battery, so that the galvanometer and the sealing nails on the battery are coaxial, and the height between the galvanometer and the surface of a welding seam is adjusted; the air blowing device is tightly attached to the battery, so that the air blowing device is enabled to be coaxial with the sealing nails; and the air blowing device is started, the fiber laser is started, the input speed and the extraction speed of protection air of the air blowing device are controlled, and the galvanometer is enabled to carry out laser welding on the sealing nails according to a preset welding track. According to the welding system and method for the battery sealing nails, the welding system is simple in overall structure, based on the method, the welding speed is high, the protection air flow and the pressure in the welding process are uniform, the stability is good, the surface of the welding seam is flat and smooth after the welding is completed, and the fusion depth and fusion width are high in consistency.

The invention provides an aluminum alloy fusion welding back face fusion width detection method with a pseudo edge. In the aluminum alloy fusion welding process, collecting a back welding seam image at the current moment; carrying out MEDIUM FILTERING and gray scale stretching, based on the corresponding relation between the minimum gray value point and the welding seam edge feature point; recognition of weld edge feature points is completed by searching a minimum gray value point; extracting edge characteristics of the back welding seam; Hough conversion is carried out; By means of the method, the problem that in the aluminum alloy fusion welding back fusion width real-time detection process, the pseudo edge interferes with a welding seam edge extraction algorithm is effectively solved, the extraction precision of the back welding seam edge characteristics is improved, and closed-loop control over the back fusion width can be achieved easily.

The invention discloses a laser welding method for a sealing nail. The laser welding method for the sealing nail comprises the following steps that the sealing nail is welded through welding equipment with a laser device, a welding track is arranged on an area to be welded, closed-loop welding is conducted in the area to be welded according to the welding track, the laser device is modulated into a high-frequency pulse mode through a control box, the welding power of the laser device is 0.5-1 KW, and the welding time of the laser device is 1-2 h; and the welding frequency after modulation is 80-100 Hz. The laser is modulated into the high-frequency pulse laser, the laser is emitted in a small-pulse-width and high-frequency mode, heat input in the welding process is effectively reduced, and the welding defect that a large number of air holes are formed at the end-to-end combination joint of a circular welding seam due to the fact that residual electrolyte in a liquid injection hole is heated and decomposed into gas under the action of a high-energy laser beam is avoided. And meanwhile, higher welding speed can be adapted, and the production efficiency is high. And after welding, the appearance is good, the consistency of fusion depth and fusion width is high, and the welding seam size stability is high.

The invention relates to the field of additive manufacturing, in particular to the field of magnetron plasma arc additive manufacturing. The invention discloses a magnetic control plasma arc additive manufacturing electric arc and wire tail end position matching method which comprises the following steps: while a plasma electric arc deflects along the axis center of a welding gun in the additive manufacturing process, a wire feeding device feeds wires in the opposite direction in the deflection direction of the plasma electric arc; and the swing frequency, direction and swing amplitude of the plasma arc are adjusted according to the shape of the additive trajectory, meanwhile, the tail end position and the wire feeding speed of opposite wire feeding are controlled to adjust the fusion width, and the swing frequency, direction and amplitude of the plasma arc are matched with the tail end position and the wire feeding speed of the wire in real time in the additive process to achieve the purpose of additive shape control and property control. Arc control and wire control are combined, so that the plasma arc is matched with the tail end position of the wire in real time, forming of any shape of a single slice layer plane is achieved, and the forming precision of the plasma arc additive manufacturing process is improved; and meanwhile, compared with single-wire feeding, opposite-direction wire feeding increases the fusion width adjusting range and the material increasing efficiency.

The invention relates to the field of laser cladding quality monitoring, in particular to a device and method for improving the workpiece edge collapse problem through closed-loop control of laser power. In the laser cladding process, a coaxial infrared camera is used for detecting and obtaining a molten pool image in the vertical direction, and the width value of the molten pool is obtained after image processing. The difference value of the detected real-time fusion width and the reference value fusion width serves as an input variable of a PID controller, laser power is regulated and controlled through combination of three control components including proportion, differential and integration, and then the laser power is fed back to a laser directional energy deposition system; according to the method, grain equiaxing is accelerated by improving the thermal gradient, increase of the width of a molten pool and accumulation of the thermal effect are effectively inhibited, the problem of workpiece edge collapse can be remarkably solved, the cladding quality and the material performance are improved, and the service life is prolonged.