252results about How to "Avoid Welding Defects" patented technology

The invention provides a method for welding a specially-thick high-strength bridge steel plate and belongs to the technical field of specially-thick plate welding. The test plate of the method adopts a symmetric narrow gap U-shaped groove form, is combinedly welded by using two efficient welding methods, namely gas shielded welding for priming and bottom filling, and double-wire submerged arc welding for continuous filling and finishing, so as to achieve the purposes of reducing filling level and giving full play to the efficient double-wire submerged arc welding and high automation degree. The method has strong operability, greatly improves the welding efficiency of the specially-thick bridge steel plate, and significantly reduces manpower cost. Furthermore, by selecting a proper welding sequence, the method solves the problem that the welding deformation of the specially-thick steel plate is hard to control.

The invention discloses a structure and a manufacturing process of a low-cost carbon fiber composite material sky railway train body, and belongs to the technical field of application of composite materials on rail vehicles. The structure comprises a train body side wall, wherein end walls are assembled and connected to the both ends of the train body side wall; a top frame and a bottom frame arecorrespondingly assembled and connected to the inner top surface and the inner bottom surface of the train body side wall, a ceiling is assembled and connected to the outer top surface of the train body side wall, and a bogie mounting hole is formed in the ceiling; the train body side wall and the end walls both comprise reinforced rib frames, inner skins and outer skins, and grids of the reinforcing rib frames are filled with sandwich foam blocks; the ceiling comprises a sandwich panel, an upper skin and a lower skin, and the top frame, the bottom frame, the reinforcing rib frame, the inner skins, the outer skins, the upper skin and the lower skin are all integrally molded from carbon fiber composite materials; and the inner portions of the reinforcing rib frames are filled with sandwichfoam, and the purpose of satisfying the function and structure of the load bearing mode of a suspension-type train body on the premise of light weight of the train body is achieved.

The invention discloses a Ni based-flux-cored wire. The Ni based-flux-cored wire comprises a flux core and a welding scale, wherein the flux core is prepared from the following components in percentage by mass: 86%-90% of Ni powder, 3%-5% of Mn powder, 6%-7% of Si powder, the balance of Cu powder, and the sum of the mass percentage of the components is 100%. The Ni based-flux-cored wire is used asa transition layer to avoid welding defects caused by thermophysical parameter difference of two types of materials during direction connection of copper-steel. The invention further provides a method for preparing copper-steel base gradient composite based on the Ni based-flux-cored wire used as the transition layer. The problem of the welding defects caused by direct connection in existing copper/steel composite is solved, parts can be combined from the steel side to the copper side to reach a gradient mode, so that the combining capacity of a heterogeneous material interface is enhanced, and the mechanical properties of composite members are improved.

The invention which relates to an electrofusion welder technology aims to provide an electrofusion welding process for preventing the generation of cold welding and over welding defects and an electrofusion welder. The process comprises the following steps: 1, measuring the current and the voltage of a welding circuit in real time in the welding process to obtain the resistance value change case of a resistance wire, controlling the voltage of the welding circuit to realize the control on the resistance value of the resistance wire and the welding power, and simultaneously controlling the temperature of a polyethylene material around the resistance wire in the welding process; and 2, recording the real-time welding power of the resistance wire in the welding process, carrying out accumulating calculation to obtain welding input heat, and ending the welding when the welding input heat reaches the value of total heat Q needed by the welding completion through an electrofusion sleeve. According to the invention, the electrofusion welder can automatically determine a reasonable welding technology only through giving the needed welding input heat. A present digital welder which can be conveniently added with the control forms the novel electrofusion welder with the cold welding and over welding prevention functions.

The invention discloses a special annular welding machine for the thin wall of a stainless steel kettle, which is characterized by comprising a stand, a round mechanism, an ejection mechanism and a welding gun mechanism, wherein a lower stand surface and an upper stand surface in different heights are arranged on the stand in a perpendicular direction, respectively; the same center axis of the lower stand surface and the upper stand surface is provided with a first round hole and a second round hole, respectively; the round mechanism is fixed in the first round hole of the lower stand surface; the ejection mechanism is fixed above the second round hole of the upper stand surface; and the welding gun mechanism is fixed on a stand strut of the stand. The special annular welding machine has the advantages that the out-of-round problem of a circular weld surface of a drawing workpiece is solved, the upper and the lower parts of the workpiece are in butt welding; meanwhile, the secondary out-of-round problem generated by stress release due to high temperature in a welding process is solved. The welding position is protected by internal protection gases in the whole process, therefore, the welding defect caused by oxidization of stainless steel in the welding process is overcome.

The invention relates to semitrailer integral axle tube extrusion moulding equipment, comprising a hydraulic machine and an intermediate frequency heating furnace, wherein the two ends of the rack of the hydraulic machine are respectively provided with a first slide seat and a second slide seat, the first slide seat is connected with a first cylinder of the hydraulic machine, the second slide seat is connected with a second cylinder of the hydraulic machine, and the first and second slide seats are provided with mould replacing wheel discs; and the top of the rack of the hydraulic machine is also provided with a clamping device for an axle tube. The axle tube extrusion moulding equipment provided by the invention has high production efficiency and has the advantages of high product processing accuracy, good integral mechanical property and stable product quality compared with the traditional hot spinning process. A steel pipe blank is directly moulded at axle heads at the two ends in an extruding way by virtue of the hydraulic machine, and various welding defects existing in subsection moulding are avoided, thus the bearing capacity of a car axle is greatly improved.

The invention discloses car roof welding equipment, and relates to mechanical welding equipment. The car roof welding equipment is invented, in order to guarantee welding quality, reduce labor intensity and lower cost input. The car roof welding equipment comprises a clamping mechanism, a welding mechanism, turnover mechanisms and a control unit, the clamping mechanism is used for clamping a roof to enable the top surface and the bottom surface of the roof to face downwards and upwards respectively, the welding mechanism is located on one sides of clamping units and used for welding the front end of the clamped roof, the turnover mechanisms are connected with the clamping units and used for turning over the clamped and welded roof, and the clamping mechanism, the welding mechanism and the turnover mechanisms are all electrically connected with the control unit, and the control unit is used for controlling clamping action of the clamping mechanism, welding action of the welding mechanism and turnover actions of the turnover mechanisms. The car roof welding equipment is mainly used for welding production.

The invention discloses a welding method, an automatic welding device and a storage medium. The welding method comprises the steps: acquiring model of a welding plate, and determining corresponding welding positions and welding parameters of all welding spots according to the model of the welding plate; generating corresponding welding tracks according to the welding positions of all welding spots; and when a welding gun moves on the welding tracks, controlling the welding gun to carry out welding according to the welding parameter corresponding to each welding spot when reaching the welding position of each welding spot. In the process that the welding gun moves and carries out welding through the preset welding tracks, a welding mode corresponding to each welding spot can be adopted forwelding when each welding spot is welded, therefore, the welding spots at the different positions on the welding plate are correspondingly welded, and welding defects of the welding spots caused by single welding mode are prevented.

The invention discloses a stainless steel band electrode electroslag surfacing welding strip and a welding flux. The Mo element is not added into a transition layer welding strip, but the surfacing metal has sufficient Mo; and the welding strip and the welding flux can be matched to be applied to large-scale surfacing on the inner wall or the outer wall of a container and can meet corrosion-resistant and high-temperature-resistant requirements. When the welding strip and the welding flux are matched for surfacing, the dilution rate is ultralow and is 5 to 12 percent and the production efficiency is high; slag is easy to remove, a formed welding bead is attractive and welding defects do not exist; the intergranular corrosion resistance is excellent; and cracks do not exist during surfacingbending.

The invention provides an inner decoration piece fixing device which is characterized by comprising a support plate and at least two abutting pressing devices. Each abutting pressing device comprises a base, a press head and a handle, one end of the press head is installed on the base in a rotating mode, and the handle is connected with the press head and is installed on the base in a rotating mode. The handles can drive the press heads to rotate in the identical direction or in the reverse direction to enable the other ends of the press heads to press inner decoration pieces in an abutting mode. The support plate is provided for the inner decoration pieces to be welded, the inner decoration pieces are fixed through the abutting pressing devices and are accurately aligned, welding accuracy and inner decoration piece stability are improved, welding shortcomings in the traditional welding process are overcome, the welding quality is greatly improved, the inner decoration piece welding safety coefficients are improved, and the danger that an operator is scalded by welding materials is removed.

The invention relates to a semiconductor packaging and jointing structure, in particular to a semiconductor packaging and jointing structure for preventing welding defects caused by substrate warping, which mainly comprises at least a semiconductor packaging component, a package carrier and a solder. The solder is used for welding external terminals of the semiconductor packaging component to the package carrier. The external terminals of the semiconductor packaging component are at least divided into two groups according to different distances from the substrate centerline. In one embodiment, the external terminals of different groups contain bumps with different heights, the bumps are used for compensating solder clearance difference between connection end points of the external terminals and the package carrier caused by a preset warpage of the substrate, and the welding defects can not occur under the situation that the warpage of the substrate is predictable. In another embodiment, a compensation bump can be arranged between larger solder clearances. The semiconductor packaging and jointing structure can shorten the solder clearance difference caused under a predictable warpage of the substrate, can prevent the welding defects caused by substrate warping; and can integrate the functions of heat radiation and micro distance maintenance.

The invention discloses a friction stir welding structure applied to a robot and a working method thereof, and relates to the technical field of friction stir welding equipment. The friction stir welding structure a shaft shoulder sleeve, a shaft shoulder, a main shaft connecting plate, a moving shaft connecting block, a stirring needle, an extension rod and a shaft shoulder locking nut, wherein the upper surface of the shaft shoulder sleeve is provided with the main shaft connecting plate, the shaft shoulder sleeve is connected with a robot friction stir welding main shaft through the main shaft connecting plate, the extension rod is arranged inside the shaft shoulder sleeve, a mounting hole is formed in the middle of the lower surface of the extension rod, the stirring needle is arrangedin the mounting hole, the lower end of the stirring needle protrudes downwards out of the shaft shoulder sleeve, a welding end is arranged at the lower end of the stirring needle, the shaft shoulderis arranged inside the lower end of the shaft shoulder sleeve, the lower end of the stirring needle penetrates through the shaft shoulder, a shaft shoulder pre-tightening hole position is formed in the lower end of the shaft shoulder sleeve, the shaft shoulder pre-tightening hole position is opposite to the shaft shoulder, and the locking nut is arranged in the shaft shoulder pre-tightening hole position. The friction stir welding structure has the characteristics of reducing the robot control difficulty, reducing the cost and improving the efficiency.

The invention discloses a lightweight galvanized steel springboard and a processing process thereof, relating to the fields of building construction and ship building devices. The lightweight galvanized steel springboard of the invention uses steel SGC570, the steel springboard has a reverse-concave cross section, supporting feet at both sides are in a box-shaped structure, grooves are arranged at the bottoms of the supporting feet, end plates are arranged at both ends of the steel springboard, transverse rib plates are alternately arranged on the bottom of the steel springboard, and cold-extrusion punch holes are arranged on the surface of the steel springboard. The supporting feet and longitudinal ribs of the lightweight galvanized steel springboard of the invention are formed together with the body through once cold bending and pressing, which avoids the processing defects of the product, avoids the welding strength requirement, increases the strength, ensures the sheet smoothness and improves the whole bearing capability. According to the invention, the steel thickness can be reduced to 1/2.4 by substituting steel SGC570 for steel Q235, thus the consumption of iron ore and the waste of energy are reduced, the needs of practical use by reasonable design can be met.

The invention provides a narrow gap laser welding protective method and a narrow gap laser welding protective device. The method comprises the steps of: in a welding process, blowing shielding gas into a welding narrow gap in a side blowing mode; sucking smoke generated in a suction mode and plasma air mass wrapped above a molten pool. By the method, the welding smoke can be removed from a welding groove, and the smoke can be prevented from accumulating on the side wall of the welding groove; and moreover, a shielding effect of plasma to laser is improved, absorptivity of the laser is enhanced, and wettability between welding materials is improved, so that the stability of the narrow gap laser welding is improved, welding defects are avoided, and the method is easy to promote in the real industrial production.

The invention discloses a welding method for a tube sheet of a robot based on laser three-dimensional modeling. The welding method is characterized by comprising the following steps: A, carrying out three-dimensional imaging on a tube sheet needed to be welded; B, recognizing a three-dimensional contour of a weld joint of the tube sheet by datamation of three-dimensional imaging; and C, inputtingthe three-dimensional contour of the weld joint to a welding robot for welding through a control command. The welding method with the steps overcomes difficulties in actual production, for example, deformation of a heat-dissipating tube of a heat-dissipating tube sheet, inconsistent mounting angle and mounting height of the heat-dissipating tube, placing deviation of the heat-dissipating tube sheet and the like. Meanwhile, the welding defect caused by difference between the heat-dissipating tube and a template in welding by way of the template is overcome.