131 results about "Melt depth" patented technology

The invention relates to a hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser, comprising the following steps: firstly fixing a variable-polarity square-wave tungsten electrode argon arc welding gun and a laser beam transmitting gun, providing a workpiece moving at a constant speed, forming a mode of preposing the variable-polarity square-wave tungsten electrode argon arc welding gun, utilizing the electric arc of variable-polarity square-wave tungsten electrode argon arc welding to remove impurities such as oxide films and the like at the surface zone of the welding workpiece, and leading the workpiece to be in a high-temperature melting state; and then leading laser beams to radiate a welded part, thus deepening the depth of fusion in variable-polarity square-wave tungsten electrode argon arc welding and finishing the welding. By utilizing the welding method adopted by the invention, the reflectivity of metal to the laser can be reduced, and the absorptivity of the metal to the laser energy is improved, so that the effective heating depth of the laser is improved, the depth of fusion of welding seams is enlarged, and the width of the welding seams and the width of heat affected zones are effectively reduced, thus finally a welding piece with deeper depth of fusion, very small heat affected zones and attractive appearance can be obtained.

The invention discloses an active agent and a method for carrying out surface treatment on materials to be welded of aluminium and aluminium alloys so as to improve the energy utilization rate of the aluminium and the aluminium alloys, deepen the fusion depth of welding seams and further obtain higher welding quality. The active agent for laser welding consists of a chloride and a fluoride, wherein the mass ratio of the chloride to the fluoride is (1-2): (1-4); the chloride is at least one of lithium chloride, sodium chloride, potassium chloride, zinc chloride, magnesium chloride, aluminium chloride, calcium chloride or tin chloride; and the fluoride is at least one of lithium fluoride, sodium fluoride, magnesium fluoride or calcium fluoride. When the surface treatment is carried out, firstly the fluoride and the chloride are mixed fully and uniformly, water is added to form a supersaturated solution, then the supersaturated solution is coated on the surface of a welded test piece as a coating agent, then drying is carried out, and finally laser welding is carried out under the condition of gas protection.

Niobium or its alloy based Superconducting Radio Frequency (SCRF) Cavities involving atleast one laser beam welded components in the SCRF cavity welded from inside surface of the wall of cavity directed to achieving more than half the thickness to full depth penetration with minimum HAZ, minimizing distortion and shrinkage. The method ensures improved weld quality and surface finish substantially free of any weld defects. Also disclosed is the welding nozzle system and welding rigs adapted to facilitate such laser welding of the Niobium or its alloy based Superconducting Radio Frequency (SCRF) Cavities. The invention is thus directed to enhancing productivity, ensuring consistent quality and reliability, enhanced weld penetration with minimum HAZ, smooth finish of weld joints at possible reduced costs.

The invention discloses a non-back gouging submerged-arc welding method of H-shaped steel. The method comprises a web beveling step, a step of removing scales, rusts and oil stains on the surface of a groove and near a welding line, a step of assembling, controlling an assembling gap and performing the spot welding for a web and a wing plate, a positioned welding treatment step, a step of putting the H-shaped steel on an H-shaped steel welding mold and a welding step, wherein in the web beveling step, a K-shaped groove is formed in a web with a thickness of 14 mm and more, a truncated edge of the web is not smaller than 12 mm, and the bevel angle is 70+- 2 degrees; in the welding step, a pulse current function is added, and reasonable matched use adjustable parameters are a current basic value of 350-400 A, a current peak value of 800-1000 A, a pulse duty factor of 60-70%, a pulse frequency of 1-1.5 Hz, voltage of 30-35 V and a welding speed of 380-410 mm/min; and the welding sequence of the welding line is as follows: the submerged-arc welding is performed for the frontal surface and the overturned diagonal plane at the two sides of the web according to the diagonal staggered sequence. The method increases the melting depth of the welding line, improves the quality of the welding line, omits a carbon arc gouging back gouging procedure, and has the advantages of low cost, good adaptability and high welding efficiency.

The invention disclose a casting and welding method of a lead-acid storage battery busbar, which comprises the steps of: sequentially placing a battery pole plate and pole lugs on the same side in tooth sockets of a busbar clamp according to a width direction vertical to the ground; injecting molten lead in a lead melting pot into the busbar clamp, and insulating; and sequentially melting and welding the pole lugs by using a heating rod. According to the invention, when the busbar is welded, the welding and melting depth and the bonding area can be ensured, pseudo welding and over welding are not caused, and the short circuiting of the molten lead can be avoided, therefore, the welding quality of the lead-acid storage battery is ensured, the electric property of the battery is improved, and the service life of the lead-acid storage battery is prolonged.

The invention discloses a novel welding method for the laser welding of a magnesium alloy. The method comprises the following steps of: adding an organic solvent into SiO2 active agent powder to form paste; coating the pasty SiO2 active agent on the surface of a part to be welded of the magnesium alloy uniformly to form a SiO2 active agent coating; and performing laser welding after the organic solvent in the SiO2 active agent coating is violated. By the method, due to high absorption capacity and low reflectivity of the SiO2 active agent coating for a laser beam, the loss rate of laser energy is reduced, the transmission efficiency of the energy is increased, and the energy utilization rate of the laser beam is remarkably improved; the energy utilization rate of the laser beam is remarkably improved, so that the fusion depth of a welding seam is remarkably increased, and the mechanical property of a welding joint can be obviously improved; and simultaneously, a low-power laser welding process can be utilized, so that the welding cost is reduced.

A girth laser-GMA hybrid welding method relates to the field of materials processing engineering, and mainly solves the problems of the conventional girth laser-GMA arc hybrid welding that the welding line reverse side forming is in-continuous, liquid metal and incomplete-penetrating are existent on the surface. The method comprises the following steps: firstly, edge preparation; secondly, dot solidification; thirdly, welding, that is, accomplishing girth laser-GMA hybrid welding. According to the method provided by the invention, laser beam enters and arcs from the angle of 11 o 'clock, the method is high the automatic degree, high in stability, deep in penetration, low in thermal input, and better in interval adaptive capacity, preheating and reassembly link are eliminated, welding production efficiency is improved. According to the girth laser-GMA hybrid welding method provided by the invention, welding line reverse side forming is continuous, liquid metal and incomplete-penetrating are not existent on the surface.

The invention relates to a CO2 laser-MIG composite welding technology for moderately thick magnesium alloy. The technology comprises the following steps: welded joints and welding methods are designed; the composite method and the heat-source interval are designed; the ratio of mixed gas of He and Ar is adjusted; the laser power and the welding speed of CO2 laser welding are selected according to the fusion depth and the thickness of a magnesium alloy plate; the gas feed rate and the welding current of MIG welding are selected; and the composite welding technology is completely finally. The technology solves the problem that general TIG and laser-TIG composite welding are difficult to complete welding of the moderately thick magnesium alloy with high quality and high efficiency, overcomes the defects of the moderately thick magnesium alloy in the process of single-heat source welding, has the characteristics of large welding fusion depth, quick welding speed, small deformation of workpieces, low assembly requirement, strong bridging capacity of a melting bath, easy integration, and so on and can effectively control the problems of overlarge welded seams and parent metal crystal grains, and so on caused by overheating in the process of welding the magnesium alloy.

The invention discloses a method for establishing an energy coupling self-consistent model for laser penetration welding. Compared with the existing point heat source model, plane heat source model and volume heat source model, the laser penetration welding model established by the method can more actually reflect the transmission and conversion of energy in the laser penetration welding process and is closer to an actual weld joint. Meanwhile, the model is also the self-consistent model and can be well applied to numerical simulation for analyzing the distribution of a plasma temperature field and the density of the laser penetration welding.

The invention discloses a focal plane rotating laser spot welding method suitable for laser spot welding of a metal material. The focal plane rotating laser spot welding method is characterized in that laser light spots perform small-radius, high-frequency and uniform-speed circular motion on the surface of a workpiece. During welding, the focus rotational frequency is 10-120HZ; the focus rotational radius is 1.0-2.5mm; the laser power is 600-3000W; the spot welding time is 0.4-3.0S; and the defocusing amount is -3-+3mm. The focal plane rotating laser spot welding method has the beneficial effects that by matching focus rotation parameters and welding technological parameters, a novel weld appearance based on heat conduction welding in a mode of repeated welding heat accumulation is acquired, is large in the width-depth ratio (effective melting width/melting depth) and does not have the defects of stomata, cracks, collapses and the like. Compared with the traditional laser spot welding, by adopting the focal plane rotating laser spot welding method, the welding process is stable, the weld quality is better, the influence on the effective melting width (fusion area melting width) bythermal contact resistance between lapping interfaces can be neglected, the weld width-depth ratio is greatly increased, and the focal plane rotating laser spot welding method has obvious technological advantages.

A battery container (10) comprises a case member (1) which is opened on one end, and a sealing member (2) for closing the opening. The case member (1) and the sealing member (2) are brought into contact, a welding beam is projected, welding a weld part (13) thereupon, and an underfill part (24) is formed in the vicinity thereof. The case member (1) and the sealing member (2) are welded such that the weld part (13) reaches the underfill part (24). It would be permissible for the width of the underfill part (24) in the direction of the projection of the welding beam to be 1/3 or more of the melt depth of the weld part (13).

A vibration isolating functional member 16 is formed of an inner cylinder 1, an outer cylinder 2, and a vibration isolating rubber 3. Thereafter an end face of a flange 10 of the outer cylinder 2 is joined with a bracket side connecting surface 15 of a bracket 4 and the joint portion thereof is laser welded. In this time, the outer peripheral end face of the flange 10 as the joining portion projects toward a position apart from the vibration isolating rubber 3 such as giving no thermal influence to the vibration isolating rubber 3. This position to give no thermal influence to the rubber is determined by an experiment based on a welded material, thickness thereof, laser welding conditions (such as melting depth, output power and welding speed), surface temperature limit of the rubber and so on.

The invention discloses a control method for asymmetrical fillet weld joint melting form and melting depth. Melting forming of an asymmetrical fillet weld joint is controlled by adjusting the weldinggun angle, a front melting pool model is identified on the basis of a vision method, melting depth estimation and control are achieved, and due to the fact that the heat dissipation difference of twoside plates of an asymmetrical structure is large, melting forming of the two sides is difficult to control. The control method comprises the steps that on one hand, the melting pool form is controlled by controlling the welding gun angle, on the other hand, a finite-size fillet weld joint workpiece temperature field analytical model is derived on the basis of an instantaneous point heat source temperature field analytical equation of an infinite-body green function and a heat source equivalent method, melting pool edge feature points are obtained by means of image treatment to correct the analytical model, numerical calculation is conducted through the corrected analytical model, the maximum coordinate of the melting point temperature in the depth direction is solved, and then melting depth calculating and solving can be achieved. Through the method, control over melting forming of the asymmetrical fillet weld joint can be achieved, and the purpose of improving the welding quality ofthe special structure is achieved.

The invention relates to an additive manufacturing excess weld metal prediction method based on a molten pool image and a deep residual network, belongs to the technical field of image processing, andaims to realize welding quality control. The method comprises the following steps: 1, building monitoring equipment, 2, carrying out image processing, 3, simplifying network learning difficulty, 4, integrating local information, 5, improving network performance, and 6, carrying out prediction calculation. According to the method, the additive manufacturing excess weld metal is accurately predicted based on the molten pool image and the deep residual network, the change of the cladding layer excess weld metal reflects the change of the fusion depth to a certain extent during additive manufacturing, the quality control of an additive manufacturing process is realized by monitoring the excess weld metal, the future excess weld metal development trend of a weld joint is accurately predicted,and the welding quality is conveniently controlled in real time.

The invention discloses a vacuum welding device and method of amorphous alloy and relates to the technical field of welding. The vacuum welding device of the amorphous alloy comprises a vacuum mechanism and a welding mechanism. The vacuum mechanism comprises a vacuum cavity and a vacuum assembly arranged in the vacuum cavity and used for conducting vacuumizing treatment on the vacuum cavity. An optical lens is embedded on the vacuum cavity. The welding mechanism comprises a laser device and a welding assembly. The laser device is arranged outside the vacuum cavity. An emission opening of the laser device is opposite to the optical lens. The welding assembly is arranged in the vacuum cavity. The welding assembly is provided with a welding platform used for holding to-be-welded pieces. The welding platform is opposite to the optical lens. By means of arrangement of the vacuum mechanism and the welding mechanism, the vacuum welding device can adopt the vacuum laser welding technology to weld the amorphous alloy in the vacuum environment, so that the joint oxidation problem can be effectively solved; the weld penetration depth can be increased beneficially, the width of a weld seam isreduced, the probability of air pores, undercut and other defects are reduced, and therefore a good weld surface is obtained.

The invention discloses a method and a device used for melting band electrode automatic compression arc deposited welding. The method takes a metal band as a melting band electrode; the metal band passes through a belt conveyor to directly reach the positions on the surface of the workpiece to be welded; a welding gun is arranged above the metal band; compression arc is generated between the metal band and a tungsten electrode in the welding gun; with the rotation or linear motion of the workpiece and feeding power provided by the solidified melting metal, the metal band moves ahead automatically and forms a driven typed belt conveying type continuously to the positions to be welded; the compression arc generated by the welding gun transmits the heat to the surface layer of the metal band and the heat is transmitted into the metal band by the heat transmission so as to lead the metal band to be melted; the workpiece carries out a stepping typed rotation or linear motion; local metal band is continuously melted to form a continuous welding molten pool and continuously solidified to form a continuous welding seam. The belt conveyor of the device consists of a ceramic head, a powder feeder, a copper conductive head, a rectangular belt conveying pipe and a conductive structure. The method and device of the invention have no problems such as melting depth and dilution rate, requires no transition layer, and has simple technqiue and low cost.

The invention discloses an alternating current magnetic field assisted laser deep penetration welding method for reducing aluminum alloy weld pores. The method is characterized in that after the bottom of the butt joint part of a to-be-welded sample is suspended, an alternating current electromagnetic field is preset below the to-be-welded sample, and a laser welding work head above the sample andthe alternating current electromagnetic field below the sample are kept still in the laser welding process; and the laser beam is focused on the upper surface of the aluminum alloy, and the magneticfield action range always covers the whole molten pool area until laser deep penetration welding is completed. According to the method, the weld porosity is reduced to the maximum extent while the weld penetration is kept unchanged, namely, the weld bearing area is increased. In addition, irregular fluctuation of the surface of an original weld joint due to the existence of pores is also inhibited, and the improvement of surface forming is also beneficial to the improvement of the joint strength.

The invention relates to an excess weld metal and weld penetration collaborative prediction method based on a molten pool image and a deep residual error network. The invention belongs to the technical field of image analysis. The trend of weld penetration and excess weld metal of future development of a weld joint can be accurately predicted, and the quality of welding can be improved. The methodcomprises the following steps of 1, restoring the change condition of the excess weld metal and the weld penetration in the length direction of a weld joint; 2, building an image processing frame; 3,determining a basic network; 4, determining the input end of the network; 5, determining the output end of the network; 6, evaluating the learning ability of the network; and 7, predicting the excessweld metal and the weld penetration through the network. According to the invention, through weld penetration and excess weld metal cooperative prediction based on a molten pool image and a deep residual network, the molten pool edge and internal details can be clearly observed, changes of the weld penetration and the excess weld metal in the weld forming process are monitored in real time, the trend of the weld penetration and the excess weld metal developed in the future can be accurately predicted, the method is suitable for different welding parameters and different weldments, and the welding quality is regulated and controlled in real time.

A lapping full-penetration laser welding method for stainless steel heat exchange plates includes the following steps of pre-welding preparation, connecting method adoption, setting of welding parameters, and protective gas adoption. A continuous laser is adopted for full penetration of the heat exchange plates of the equal thickness. The rule of influence of different welding parameters on the depth of penetration, width of penetration and mechanical property of full-penetration joints and on the oxidation stain of the weld surface is obtained by the orthogonal experimental method through optimization, the widths of penetration of the upper interface and the lower interface are increased by a larger positive off-focus value, and the quality of welded joints is improved by limiting the depth of penetration of the welded heat exchange plates at the lower layer.

The invention discloses a weld penetration state and penetration depth real-time prediction method based on visual characteristics of a molten pool, a set of molten pool visual sensing system is designed based on a color CCD, and two-dimensional characteristics of the molten pool can be extracted in real time in the welding process. The area, the length and the width of a molten pool are used as input, the penetration state of a weld joint is used as output, a GMAW penetration state real-time prediction model is established based on a support vector machine (SVM), and experimental results showthat the model can effectively predict the penetration state of the weld joint in the welding process in real time. Similarly, the area, the length and the width of the molten pool serve as input, the weld penetration serves as output, a GMAW weld penetration real-time prediction model is established based on the BP neural network, and experimental results show that the model can effectively predict the weld penetration in the welding process in real time. The design is simple, and operation is easy and convenient; the calculation result of the constructed model is verified, and the accuracyis high.

The invention discloses a modeling method for a laser arc heat source model based on a groove compression coefficient, and the method comprises the steps: 1, building a composite heat source model composed of three heat sources, and adding a groove compression function on the basis of a double-ellipsoid heat source model and a cylindrical heat source model; 2, according to the shape of the fusionline of a welding joint, repeatedly checking the welding heat source parameters by applying an acceleration step method to obtain a correspondingly simulated molten pool shape; and 3, serving the goodness of fit between the simulated molten pool shape and the actual molten pool shape as a standard for determining whether the groove compression function is accurate or not, and obtaining an optimalnumerical simulation heat source model. The problem of depth is solved by adding a cylindrical heat source on the basis of two original heat sources, the method can be better suitable for medium plates, and the groove compression function is added on the basis of the original double-ellipsoid and cylindrical heat sources, so that the problem of width is solved, and the fusion depth is closer to anactual weld joint to a certain extent.

The invention discloses a light absorption coating used for increasing the melting depth of aluminum-copper dissimilar metal laser welding and a laser welding process method. A light absorption coating is formed by coating a carbon-based light absorption coating. The light absorption coating is formed on the surface, and meanwhile, the process method that copper is located at the upper position and aluminum is located at the lower position is combined, so that the process of a traditional laser welding method is complex, the laser utilization rate is low, the production efficiency is low and the like are effectively solved, the laser welding production efficiency and the welding depth can be effectively improved, and meanwhile, the mechanical property of a welding joint is improved.