9 results about "Fusion width" patented technology

This invention belongs to the field of welding technology, and particularly relates to a laser-TIG hybrid welding device and method that can increase weld width. Its features include a laser welding torch and a TIG welding torch. The TIG welding torch incorporates an ultrasonic micro-vibration component. The laser welding torch is connected to a laser generator, and the tail of the TIG welding torch is connected to a welding power source. The TIG welding torch contains a combined electrode, which includes a copper rod at the top and a tungsten electrode connected to the lower end of the copper rod. The ultrasonic micro-vibration component includes a transducer and an amplitude transformer connected to the transducer. The copper rod is located within the central hole of the transducer and the amplitude transformer. The tungsten electrode is connected to the amplitude transformer via an eccentric ceramic ring. A tungsten electrode sleeve is connected to the bottom of the amplitude transformer, and a nozzle is located on the outer side of the tungsten electrode sleeve. The bottom of the tungsten electrode sleeve is a concave mirror surface. The beneficial effects of this invention are: it is suitable for welding nickel-based alloys, significantly increases weld penetration, improves weld formation quality, enhances the welding capability of thick plates, and solves the welding problem of nickel-based alloy thick plates larger than 10mm.

The application provides a method for improving the elongation of a high-strength aluminum alloy medium plate welded joint, which comprises the following steps: butting and assembling two welding workpieces with equal thickness to form a flat plate-shaped workpiece to be welded; determining first optimized process parameters of a laser-arc hybrid welding device and second optimized process parameters of a laser heat conduction welding device, wherein the second optimized process parameters are determined according to the front surface fusion width FW and the back surface fusion width BW of the welded joint formed according to the first optimized process parameters; using the first optimized process parameters to perform laser-arc hybrid welding on the front surface welding area of the flat plate-shaped workpiece to be welded, and simultaneously using the second optimized process parameters to perform laser heat conduction welding on the back surface welding area of the workpiece to be welded. The laser heat conduction welding acts on the back surface welding area, so that the back surface fusion zone and the corner part of the base material surface realize smooth transition, the stress concentration at the weld toe is relieved, and the post-weld elongation of the welded joint is improved under the premise that the strength of the welded joint meets the design standard.

The present application belongs to the technical field of welding, and particularly relates to a welded joint of a steel piece, a manufacturing method and application. The welded joint comprises two steel plates and a weld seam, the weld seam is arranged at the butt joint part of the two steel plates, the upper and lower retardation angles of the welded joint satisfy a specific relationship, and / or the front, back and narrowest fusion widths of the welded joint satisfy a specific relationship, so that the problem of aluminum enrichment in the weld seam after laser wire filling of the aluminum-silicon hot-formed steel in the prior art can be overcome.

The invention belongs to the technical field of welding, and discloses an aluminum alloy thin-wall pipe pulse TIG welding quality control method based on droplet transfer monitoring. Key welding process parameters are screened through tests; screening parameters are used as optimization variables, expert visual inspection scores, tensile strength, fusion width, fusion depth and the occurrence rate of air holes are used as response targets, a response surface approximation model is established through tests, comprehensive weights are determined in combination with an entropy weight-TOPSIS method, and static optimal welding process parameters are solved; in a welding test, molten drop transition characteristic data are extracted through a molten drop monitoring device and serve as optimal molten drop transition characteristic parameters; in the actual welding process, the static optimal process parameters serve as the benchmark, the optimal molten drop characteristics serve as the reference, molten drop behaviors are monitored in real time, the welding current, the wire feeding speed or the height of a welding gun is dynamically adjusted through a fuzzy-PID control method, molten drop transition is stabilized within the optimal range, and whole-process closed-loop control over the welding quality is achieved.

This application discloses a method and apparatus of detecting a fusion width of a T-type electron beam weld. The method includes the following steps. A preset reference block is detected using an ultrasonic scanning detection system to determine a weld fusion boundary. A first scanning signal corresponding to the to-be-detected piece is acquired by the ultrasonic scanning detection system. A first scanning image of reflected waves from surfaces of multiple welds is generated according to the first scanning signal. The reflected wave signals in the first scanning signal are normalized according to the first scanning image to obtain a second scanning signal. A second scanning image is generated according to the second scanning signal. This application enables the rapid and precise detection of fusion width of a T-type electron beam weld.

The invention discloses a medium-thickness wall pipe circular seam all-position laser welding forming control method, and belongs to the technical field of laser welding. The problems that full-position laser deep penetration welding of the medium-thickness wall pipe lacks a systematic welding seam forming control method, and efficient and high-quality welding is difficult to achieve are solved. The method comprises the steps of 1, preparation before welding; 2, pre-calibrating a critical back fusion width threshold value; thirdly, inert gas protection flow control and initial welding parameter setting and execution are carried out; and 4, weld forming defect control. The method is used for the full-position laser welding forming control of the medium-thickness wall pipe circular seam.

The invention discloses a lithium battery laser welding bead penetration depth and width detection pretreatment method, which comprises the following steps of: cutting a to-be-detected sample bead position to expose a bead section, and obtaining a pole column bead sample and an aluminum shell bead sample; weld bead sections of the pole column weld bead sample and the aluminum shell weld bead sample are polished; soaking the pole welding bead sample and the aluminum shell welding bead sample in a chemical reagent, or performing electrolytic polishing on the pole welding bead sample and the aluminum shell welding bead sample; and cleaning and drying. According to the method, corrosion or electrolytic polishing treatment is conducted on the grinding surface of the welding bead through the chemical reagent, an oxide layer and impurities on the metal surface can be removed, the surface smoothness can be improved, the brightness and reflectivity of the metal surface can be improved, the microstructure of the welding bead can be clearly displayed, parameters such as the penetration depth and the penetration width can be analyzed conveniently, and the welding quality can be evaluated conveniently; and the accuracy of measurement and calibration of the fusion depth and the fusion width is improved.

The invention discloses a method and system for establishing a double-ellipsoid heat source model containing a distribution coefficient, and belongs to the technical field of welding numerical analysis, and the method comprises the steps: introducing a heat flow density distribution coefficient M, and constructing a double-ellipsoid heat source heat flow density distribution function containing the heat flow density distribution coefficient M; according to the energy conservation theorem, the maximum value of the heat flux density of the front and rear semi-ellipsoids is calculated; and establishing a double-ellipsoid heat source model containing a heat flux density distribution coefficient M. On the basis of a traditional double-ellipsoid model, the heat flow density distribution coefficient M is introduced, heat flow distribution is adjusted by setting the heat flow density distribution coefficient M, and the applicability of the double-ellipsoid model to high-pressure TIG, plasma arc welding and the like with more concentrated heat flow and hot wire TIG, submerged-arc welding and the like with more dispersed heat flow is improved; an independent heat flux density distribution coefficient M is introduced, and the M is adjusted, so that a heat affected zone can be adjusted more flexibly and accurately, and the fusion width and the fusion depth measured by an experiment are matched.

The invention discloses a ship structure weld joint sectional area calculation method based on a ship CAD system, and the method comprises the steps: calculating the cross sectional area of a groove through the basic parameters of the shape of the groove, the effective plate thickness, the fusion width, the excess weld metal, the carbon gouging width and the carbon gouging depth; when the cross section area of the groove is calculated, parameters such as fusion width, excess weld metal, carbon gouging depth and carbon gouging width which influence the size of the cross section of the groove in actual welding are fully considered, so that the finally estimated cross section area of the groove of the welding seam is more accurate, the welding material consumption can be accurately estimated subsequently, and the welding material waste is avoided.