54results about How to "Eliminate Welding Defects" patented technology

The invention provides a large tank singe-face-weld double-face-forming method, which comprises arranging a weld joint forming pad on the back face of a weld joint of a weld part, wherein the weld joint forming pad is provided with a weld joint forming groove with the shape matched with that of the weld joint; fixedly and tightly attaching the weld joint forming pad on the back face of the weld joint to enable the center of the weld joint to align at the center of the weld joint forming groove; welding the front face of the weld joint; using large weld current for weld penetration of a weld part at one step; and enabling a weld puddle to be cooled and solidified on the weld joint forming groove. Compared with a traditional double-face-weld method, the weld joint is formed by one step, weld quality is better, production efficiency is improved, and production cost is reduced.

The invention discloses a spiral seam submerged-arc welded pipe butt joint process and relates to the technical field of a spiral seam submerged-arc welded pipe. The process comprises the processing procedures of pipe end rounding, pipe end chamfering, steel pipe butt joint, prewelding, inner welding, outer welding, repair welding and circular seam nondestructive inspection. Compared with the traditional manual welding single-side welding double-sided forming process, the spiral seam submerged-arc welded pipe butt joint process has the advantages that the problems of welding quality stability influence and the like caused by great probability generation of defects such as air holes, slag clamping and cracks in the welding seam of the manual welding are solved, the butt joint quality and the efficiency of a steel pipe are greatly improved, the material consumption and the production cost can be greatly reduced, the field construction operation is convenient, and the batch production capability for producing butt joint pipes meeting API5L and relevant standard requirements is realized.

The invention provides a gas buoyancy auxiliary welding device. The gas buoyancy auxiliary welding device comprises a welding platform (1) and a gas pressure supporting device (2). The gas buoyancy auxiliary welding device is characterized in that in the welding process, a gas pressure controller (201) in a gas chamber (205) continuously reads the value of the gas pressure in the gas chamber through a gas pressure sensor (207), the read gas pressure value is compared with a target gas pressure value, and accordingly, the gas pressure in the gas chamber keeps stable by controlling the flow rateof a gas outlet solenoid valve (206) and a gas inlet solenoid valve (208). According to the gas buoyancy auxiliary welding device, the pressure of gas under welding seams counteracts the gravity borne by a welding pool, thus, collapse, humps and other welding defects are eliminated, the welding quality is improved, the welding thickness of a laser device is increased, and the gas buoyancy auxiliary welding device is simple in structure and easy to apply and popularize.

The invention discloses an electron beam filler wire welding method of a TC4 titanium alloy and a QCr0.8 copper alloy, which relates to a welding method of the TC4 titanium alloy and the QCr0.8 copper alloy, to solve the problem that mechanical property requirement of a welding line cannot be met because of metallurgy incompatibility and physical performance mismatching in the prior art in which common welding process is applied between different materials of the TC4 titanium alloy and the QCr0.8 copper alloy. The welding method comprises the following steps: firstly, preparing before welding; secondly, sending a copper-vanadium alloy welding wire from a wire feeding mechanism to a lower beam spot position of an electron beam through a wire feeding nozzle; and thirdly, accomplishing welding of the TC4 titanium alloy and the QCr0.8 copper alloy under the vacuum condition. The welding line obtained by using the method disclosed by the invention is smooth, level, continuous and defect-free, and is as high as 315MPa in tensile strength; and the welding method disclosed by the invention can be applied to the field of welding engineering of different materials.

The invention relates to a self-protection welding material, in particular to a tubular welding wire for surfacing capable for forming high amorphous nanocrystalline content, and belongs to the technical field of wear-resistant and corrosion-resistant materials. The tubular welding wire comprises the following powder core components in percentage by mass: 19-22% of Al, 17-20% of Zr, 15-18% of Ti, 9-12% of V, 6-9% of Cu, 5-8% of Ni, 4-7% of B, 2-3% of Mn, 1-2% of P, 1-1.5% of N, 4-9% of hafnium carbide, 2-5% of graphite, and the balance of rare earth nanometer additive. The self-protection powder core tubular welding wire can directly perform surfacing under the conditions of adding of no flux and protective gas; the formed surfacing layer is higher in amorphous nanocrystalline content; the amorphous and basal body transition problem is preferably solved; the bonding strength is improved; and the cladding layer is excellent in wear and corrosion resistance.

The invention relates to a large-thickness workpiece vacuum preheating and electron beam welding device which comprises a vacuum chamber, a heating device, a moving platform, an electronic gun, a clamping tool and a to-be-welded workpiece. The to-be-welded workpiece is composed of two large-thickness workpieces. The heating device comprises an upper heating assembly, a lower heating assembly and three side wall heat insulation protection assemblies. In the vacuum environment, workpiece high-temperature preheating is achieved, the cooling speed is effectively reduced, generation of quenched structures in welding seams and heat affected zones is avoided, and the problems that the welding seam crack tendency of high-strength steel and high-strength titanium alloys and other products is large,and ductility and toughness of welding seams are poor are solved through a high-temperature preheating and electron beam welding method.

The invention relates to a welding technology, discloses a pipe plate inner hole welding method for a small-aperture heat exchange pipe, and can effectively eliminate the welding defects that the outer surface of a joint is concave inwards and arc extinguishing pits are formed in the back surface of the joint. The inner hole diameter of the heat exchange pipe is 9-15 mm, and the wall thickness is1-2 mm. The method comprises the steps that the position of the tungsten pin of a welding gun head is adjusted according to a pipe plate boss with a groove so that when the welding gun is inserted andis in a to-be-welded state, the tungsten pin is located on one side of the pipe plate boss and the distance between the tungsten pin and the to-be-welded end face of the pipe plate boss is within 0-0.5 mm; the heat exchange pipe and the pipe plate boss are coaxially assembled, and it is ensured that the gap between the to-be-welded end faces of the two assemblies is within 0-0.1 mm; any one of the positions of 3-5 o'clock and 7-9 o'clock is selected as an arcing point, and uphill welding is set after arcing; and the circumference to be welded is equally divided into 2N sections according to the selected arcing points, the current of each section is set according to the recommended process parameters and all-position inner hole welding is performed on the circumference to be welded.

The invention belongs to the technical field of hot isostatic pressing welding, and particularly relates to a hot isostatic pressing method for preventing adhesion between a welding part and a packagesleeve. The methods specifically comprise the steps that coating deposition is performed, the cleaning and baking degassing are performed, the package sleeve is subjected to packaging and sealing, the hot isostatic pressing welding is performed, and the package sleeve is removed. According to the hot isostatic pressing method for preventing the adhesion between the welding part and the package sleeve, the problems that the existing hot isostatic pressing method to prevent adhesion between the welding part and the bag sleeve is prone to causing the defect of a welding interface and the uncompleted anti-adhesion effect are solved; after the hot isostatic pressure diffusion welding, non-adhesion exists between the welding part and the package sleeve, the welding part are easily separated from the package sleeve, and the welding part is completed under the condition of maintaining good welding interface quality; and the requirement of product technical index can be met, the follow-up process is simplified, the production efficiency is improved, the batch production of the hot isostatic pressure diffusion welding can be achieved economically and environmentally.

The invention provides a Ti-Ni based shape memory alloy vacuum electron beam connecting technology. Concretely, vacuum electron beams are used for achieving connection of Ti-Ni-X alloy, wherein X can be Nb, Mo, Cu, Hf and the like. An existing connecting mode of Ti-Ni based shape memory alloy has the problems of being low in weld strength, thick and big in grain structure, prone to generating cracks and the like. The electron beams which are strong in penetrating power, high in energy transformation ratio and good in controllability are adopted as a welding hot source, therefore, time of the whole connecting process is shortened, a heat affected zone is reduced, weld defects are reduced, moreover, narrow weld seams can be obtained (the width is smaller than 1mm), mechanical performance and the memory effect of welded material are ensured to the maximum extent, after parameter optimization, the strength of a electron beam welding connector can reach over 75% that of parent material, and the memory effect can reach over 85% that of the parent material.

The invention relates to a welding technology of shell covers and a cylinder body of an aluminum alloy tank. The welding positions of the shell covers and the cylinder body are polished before welding; gaps are left between the shell covers and the cylinder body in advance, and then TIG is used for welding and fixing on the outer side; finally, the shell covers and the cylinder body adopt the two-side arc-alignment TIG for welding. The welding technology eliminates the situation that when a manual TIG welding method is used for welding the circular seams between the front shell cover and the cylinder body and between the back shell cover and the cylinder body, chain-shaped air hole welding defects exist at the longitudinal center positions of welding seams, the qualified welding seams canbe obtained, and the safety of a tank assembly is ensured.

The invention relates to an ultrasonic roll welding and resistance internal heat composite metal seam welding device. The welding device is characterized by being provided with an ultrasonic roll welding mechanism and a resistance internal heat welding mechanism, the ultrasonic roll welding mechanism is provided with an ultrasonic generator and a roll welding pressure head (14), the two sides of the roll welding pressure head (14) are correspondingly provided with a transducer (1) and a transducer (12), the resistance internal heat welding mechanism is provided with a medium frequency/high frequency resistance welding power supply used for outputting medium/high-frequency pulse currents, electric pulses output by the medium frequency/high frequency resistance welding power supply are sentto conductive rolling wheels through electrode supports, the conductive rolling wheels are in contact with a metal plate to be welded, two paths of electric pulse signals which are the same output bythe medium frequency/high frequency resistance welding power supply are sent to the two electrode supports correspondingly, the two electrode supports are correspondingly connected with the two conductive rolling wheels, and the two conductive rolling wheels are used for outputting electric signals to the contact surface of the metal plate to be welded. According to the welding device, the joint softening phenomenon caused by melting welding can be effectively avoided, the welding defects such as air holes are overcome, and a wide application prospect is realized.

The invention discloses a method for removing melting solder paste gas holes on a heat pipe radiator. The method includes the steps that S1: at least a heat pipe and a base are provided, and a heat pipe slot is formed in the base; S2: the heat pipe and the heat pipe slot are made to be in clearance fit, solder paste is applied in a clearance between the heat pipe and the heat pipe slot, and then the heat pipe and the base are locked and fixed through a mold and placed in a heating furnace to be heated, so that the solder paste is melted; and S3: the mold and the heat pipe radiator are taken out from the heating furnace, then the mold and a heat pipe heater are placed on a vibration device and are fixed on the vibration device through a fixture, the vibration device is started to vibrate the heat pipe heater, and the molten solder paste flows and fills the gas holes quickly through vibration. The method can remove the gas holes inside a metal compound at the welding interface of the heat pipe radiator in time, improve the welding quality of the heat pipe radiator, so as to improve the heat dissipation performance of the heat pipe radiator.

The invention discloses an automatic welding technique for splicing plates of a cylinder body of an oil tank truck and belongs to the technical field of oil tank truck machining. The automatic welding technique for the splicing plates of the cylinder body of the oil tank truck comprises the following steps that (I) obverse-side welding is conducted, specifically, cylinder body splicing plate ring bending joints are subjected to obverse-side through welding till double face forming is achieved; and (II) reverse-side welding is conducted, specifically, after the step (1) is completed, the splicing plates of the cylinder body are turned, and non-wire filling self-fusible welding is conducted on the excess weld metal of the back sides of weld joints. According to the automatic welding technique for the splicing plates of the cylinder body of the oil tank truck, the work procedure that non-wire filling self-fusible welding is conducted on the excess weld metal of the back sides of the weld joints is added, the back-side weld joints are re-melted, air holes in the excess weld metal of the back sides of the weld joints are melted again to enable air in the air holes to overflow, thus after welding, chain-shaped air hole welding defects at weld toes of the back sides of the weld joints and in the excess weld metal of the back sides of the weld joints are completely eliminated, and the weld joint quality of automatic welding of the splicing plates of the cylinder body of a tank body is ensured.

The invention discloses an automatic bottoming process method for a process pipeline robot, relates to the technical field of pipeline welding, ensures that the thickness of a bottoming weld joint is 4-5mm, realizes bottoming welding of a process pipeline by adjusting and controlling a welding position, welding parameters, interlayer temperature and the like, ensures penetration welding and attractive weld joint formation, obtains higher welding quality, and simultaneously ensures the welding quality of the process pipeline. The process is simplified, the welding wire is fully melted under the action of arc heat in the welding process, meanwhile, welding defects caused in the backing weld and operation process can be eliminated, the welding efficiency is improved, the welding cost is reduced, and the deposition efficiency is high.

The invention discloses an aluminum alloy drawing type friction plug repair welding joint. According to the aluminum alloy drawing type friction plug repair welding joint and a machining method thereof, a repair welding mechanism comprises a plug rod and a plug hole, and a welding section is arranged on the plug rod; the plug hole is provided with a rigid forming ring for preventing the plug rod from deforming in the repair welding process and fully interacting with the plug rod under the action of axial force, wherein the forming ring is of a stepped hole structure, the upper portion of the forming ring is conical, one conical included angle A4 of an upper conical hole part is 20-30 degrees, the diameter d2 of the small end of a conical hole is larger than or equal to the diameter D2 of the small end of the welding section and is smaller than or equal to the diameter D3 of the large end of the plug rod welding section, and the depth h6 is 0.1-0.15 time of the plate thickness; the middle portion of the forming ring is conical, one conical included angle A5 of a middle conical hole part is reduced by 3-5 degrees compared with the upper conical hole, and the depth h7 is equal to the depth h6 of the upper conical hole; and the lower portion of the forming ring is a straight hole, and the diameter d1 of the straight hole is 1.1-1.25 times of the diameter D2 of the small end of the plug rod welding section. By means of the aluminum alloy drawing type friction plug repair welding joint and the machining method thereof, the problem that non-welding and weak-bonding defects are prone to being formed on the bonding interface of the plug rod and a base material is solved.