166results about How to "Relieve welding stress" patented technology

The invention relates to a method for transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel, which belongs to the technical field of the connection of dissimilar materials. In the prior art, the technology of the connection between TiNi shape memory alloy and stainless steel has the problems of welding crack, large crystal grains in the heat affected zone and poor mechanical properties. The transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel is realized through the following steps: after the surfaces of TiNi shape memory alloy and stainless steel to be welded and the surface of AgCuTi foil is cleaned and dried, a TiNi shape memory alloy/AgCuTi metallic foil/stainless steel structure is formed, fixed through a welding clip, and then positioned in a vacuum diffusion oven, and welding pressure and temperature are applied to the structure. The method has the advantages that the welding temperature is low (relative to fusion welding), the influence to the base material is small, the connector has no welding defect, the shearing strength of the connector in the room temperature reaches 250 MPa, and the microhardness of the area near the seam section can reach 670 Hv.

The invention discloses an extensible and retractable inner supporting tool. One end of a left-handed screw is installed in a screw installation hole in the plane geometric center of a supporting plate, and the left-handed screw is in rotating fit with the screw installation hole. A left-hand thread at the other end of the left-handed screw is installed in a threaded hole in the center at one endof a sleeve. One end of a right-handed screw is installed in a screw installation hole in the plane geometric center of the other supporting plate, and the right-handed screw is in rotating fit with the screw installation hole. A right-hand thread at the other end of the right-handed screw is loaded in a threaded hole in the center at the other end of the sleeve. The extensible and retractable inner supporting tool has extending and retracting functions; in a shortened state, the extensible and retractable inner supporting tool can be put into a shell and then extends to support a cylinder, rigid restraining to the cylinder is achieved, and the welding deformation is reduced; and by means of stress relief annealing heat treatment through the belt tool, deformation stress is eliminated, andtherefore the cylinder circular degree after welding is guaranteed, and the circular degree of the shell is reduced to 2.5 mm from 10 mm.

The invention belongs to the technical field of laser machining and relates to an ultrasonic-impact-assisted laser cladding repairing method for an ultra-high-strength steel member. The ultrasonic-impact-assisted laser cladding repairing method is mainly used for repairing damage such as surface corrosion and micro cracks of the ultra-high-strength steel member of an airplane. In the earlier stage, same metal powder for repairing is adopted for conducting a direct laser cladding repairing test and an ultrasonic-impact-assisted laser cladding repairing test on a 30CrMnSiNi2A ultra-high-strengthsteel undercarriage half-shaft base body, wherein according to the metal powder, the cladding metal impact toughness is larger than or equal to 420 KJ/m<2>, the room-temperature ductility is larger than or equal to 10.8%, and the room-temperature tensile strength is larger than or equal to 1400 MPa; and the room-temperature tensile performance, the room-temperature impact performance and the microhardness performance of two repairing areas are tested. The results are obtained as follows: according to direct laser cladding repairing, the average tensile strength is 1428.6 MPa, the average elongation rate is 11.8%, the average impact toughness is 471 KJ/m<2>, and the average microhardness of repairing metal is 474.3 HV; and according to ultrasonic-impact-assisted laser cladding repairing, the average tensile strength is 1436.2 MPa, the average elongation rate is 14.8%, the average impact toughness is 643 KJ/m<2>, and the average microhardness of the repairing metal is 490.7 HV.

The invention relates to an alloy material with a thermal expansion coefficient in a gradient change and a preparation method of the alloy material. The alloy material comprises a substrate material component and a thermal expansion coefficient adjusting phase component, wherein the substrate material component is one or a mixture of several elements of Cu, Ni, Cr, Mn, Co and Fe in an optional ratio; the thermal expansion coefficient adjusting phase component is one or a mixture of several fibers of W, Mo, Al2O3, SiC and Si in an optional ratio; a gradient transition alloy is at least divided into two sections; and the distribution of the components of a thermal expansion coefficient adjusting phase in each section of the alloy changes in a gradient way. The method disclosed by the invention is suitable for preparing gradient transition alloy bars and pipes, the thermal expansion coefficient of the prepared alloy material changes in the gradient way, and the alloy material is well matched with welded ceramics and metals. The gradient transition alloy has important significance to release residual stresses generated in a ceramic and metal connecting process.

The invention relates to the technical field of ship construction, in particular to an assembling and welding method of a side thrust device. The assembling and welding method of the side thrust device comprises the steps that lofting is conducted so as to machine extension pipes, and four generatrices of each extension pipe are drawn; by making the four generatrices of each extension pipe as benchmarks, bearing blocks, annular reinforcing rib plates, longitudinal reinforcing rib plates and motor fixing bases are assembled and welded to constitute two side thrust seal cover modules; the side thrust seal cover modules are integrally annealed so as to eliminate welding stress, and the inner surfaces of the bearing blocks and the upper surfaces of the motor fixing bases are machined; the two side thrust seal cover modules are welded to two sides of a side thrust cylinder body respectively, and after welding is finished, the side thrust seal cover modules and the side thrust cylinder body are integrally assembled and welded in a segmented mode; after a slipway is folded, the integral segment comprising the side thrust seal cover modules and the side thrust cylinder body is provided with blades, a shaft, a bearing assembly, a seal part, a transmission mechanism and a driving mechanism. The assembling and welding method of the side thrust device can avoid welding deformation of the side thrust device, guarantee concentricity of bearings and shorten the period of ship construction.

The invention provides a construction method for butt welding irregular space box-type steel members, comprising the following steps of: (1) mounting at least a fabrication hole at an upper wing plate at a welding position; (2) butting two sections of the steel members; (3) entering into the box of the steel box from the fabrication hole, and welding butting positions of a lower wing plate and ribs by means of sectional and symmetrical welding; (4) welding the butting positions of side plates at the external part of the box of the steel box by means of symmetrical welding; and (5) welding a cover plate on the fabrication hole. The construction method provided by the invention is convenient in operation, and capable of removing welding stress and improving welding quality.

The invention relates to a method for mounting a water beam of a walking beam heating furnace in a thermal state, namely a simulated working state. The method is characterized in that: an assembly welding method for the water beam and an upright post at the temperature of 273+/-10 DEG C is completely simulated through a heating incubator and a temperature control system, and comprises the following operating steps of: 1) determining the verticality and elevation of a double-barreled upright post, and fixedly welding the double-barreled upright post; 2) calculating the heated elongation of the water beam; 3) taking the double-barreled upright post as a center, correspondingly determining center distance among other upright posts according to the elongation, and fixedly welding all the upright posts; 4) correcting out-of-tolerance dimension among the upright posts after finishing the welding; 5) arranging a heating box; 6) heating the water beam, and matching with welding; and 7) keeping the temperature and cooling, wherein the heating box is arranged and controlled in sections. The invention has the advantages that: the service life is obviously prolonged, the welding stress in a cold drawing state is eliminated, and the fabrication error of the water beam can be effectively eliminated in the construction process.

The invention relates to a joggling type vehicle bottom plate assembly which comprises edge beams, longitudinal beams and transverse beams. The joggling type vehicle bottom plate assembly is characterized in that the upper parts of the edge beams and the longitudinal beams are provided with planes; one side edge of the edge beams is provided with a joggling groove structure along the length direction, and both side edges of each longitudinal beam are provided with joggling groove structures along the length direction; the edge beams are connected with the longitudinal beams by a joggling groove along the transverse direction of a vehicle body so as to form a plane on the upper surface or the edge beams are connected with the longitudinal beams and the longitudinal beam is connected with the longitudinal beam in such a way that both side edges are provided with transition connecting plates in the joggling groove structure by the joggling groove along the transverse direction of the vehicle body so as to form the plane on the surface; and the transverse beams are connected with the edge beams and the longitudinal beams. The invention prevents the welding deformation of the bottom plate assembly and eliminates welding stress, and the strength and the working reliability of the bottom plate assembly are not influenced by welding, particularly the vehicle bottom plate made of an aluminum magnesium alloy material has more obvious effect; no harmful gas is generated in the assembly process of the bottom plate assembly, thereby being beneficial to environmental protection; the assembly process is simple, the production efficiency is high, and the manufacture cost is reduced.

The invention discloses a method and a device for welding a drill pipe body for rotary drilling and outer keys. The method comprises the following steps of: a preheating step: preheating a welding area (13) between the drill pipe body (11) and each outer key (12); a welding step: welding the welding area (13) between the drill pipe body (11) and each outer key (12) to form a welding seam; and a post-heating step: heating the welding seam formed between the drill pipe body (11) and each outer key (12) after the welding step. The invention also discloses a device for welding the drill pipe body for the rotary drilling and the outer keys, which comprises a preheating unit (3), a welding unit (2) and a post-heating unit (4). By the technical scheme, the cold breaking phenomenon during the welding process of the drill pipe body and the outer keys can be effectively avoided. In addition, the welding stress and the welding deformation of the drill pipe body and the outer keys, caused after the preheating step and the post-heating step, can be effectively eliminated.

The invention discloses a method for repairing the arc-seam weld porosity defects of titanium alloy sheets through hot rolling, which is characterized in that the hot rolling operation is performed by using the resistance welding principle and the resistance welding properties of materials of parts, and specifically discloses a process method which is implemented through exerting a pressure on weld metals and carrying out ohmic-heating so as to eliminate porosities by using a roll welding method. By using the method disclosed by the invention, the problem that the insides of arc-seam welds have porosity defects in the process of processing titanium alloy plate-welding cases can be solved subtly, the quality repair on welds with small deformation or micro-deformation can be realized, and in the process of hot rolling, because the weld position is heated or pressurized, and subjected to trace form correction and welding stress elimination, the weld qualities, structure sizes and technical conditions of parts after construction meet the design requirements. If a repair welding part has an indentation with a depth exceeding process standards, the defect can be treated by using an argon arc welding surface-cladding process, and the qualification rate of defect repair implemented by using the method disclosed by the invention is 100%.

The invention discloses a welding method of a super-thick steel casting. Process steps include S1, preparing a joint: an asymmetric X-type groove is adopted; S2, preheating: the front side and the reverse side are uniformly heated, the preheating temperature is set within the range of 150-160 DEG C, and the heating rate does not exceed 100 DEG C / h; S3, back welding: gas shielded welding backingis carried out on flux-cored welding wires for three layers, and fire warming is carried out to remove stress after each weld seam is welded; S4, reverse side air gouging: air gouging back chipping and carburized layer removal are carried out; S5, reverse side back welding: back welding is carried out by three layers after the temperature of the steel casting reaches a preheating temperature according to the method described in the step 2, and fire warming is performed on each weld seam to remove stress; S6, filling and cover surface welding: the front side and the reverse side are welded respectively by one welder simultaneously and symmetrically, and hammering is carried out layer by layer after each layer of weld beads of each weld seam is welded; and S7, 550 DEG C *2h heat treatment after stress removal is carried out immediately after the completion of welding. By means of the method, welding stress and welding deformation can be significantly reduced, and the probability of generating steel casting welding cracks is greatly reduced.

The invention provides vacuum welding equipment with an supersonic aging function and an application method of the vacuum welding equipment. The vacuum welding equipment comprises a vacuum device, a welding vacuum chamber, a feeding vacuum chamber, an electron beam welding device, a welding working table, an argon arc welding device, a nitrogen making device, and an supersonic aging device. The welding vacuum chamber and the feeding vacuum chamber are separately provided with a piston sealing plate and a lifting sealing plate. The electron beam welding device is arranged on the piston sealingplate. The welding working table can rotate at 180 degrees and 360 degrees. The argon arc welding device is mounted on the piston sealing plate in a replacing mode. The nitrogen making device can provide liquid nitrogen for a welding gun and a weldment for cooling. The supersonic aging device is arranged on a conveying belt. Continuous production is achieved. The size of the vacuum chamber can beadjusted based on the size of the weldment. Impurities of the weldment can be shaken off before the weldment entering the vacuum chamber. The supersonic aging is adopted to remove welding stress afterwelding. The fatigue life of a welding structure is prolonged. The welding quality is guaranteed.

The invention provides vacuum welding equipment and a using method thereof. The vacuum welding equipment comprises a vacuum device, a welding vacuum chamber, a feeding vacuum chamber, an electron beamwelding device, a welding worktable, an argon arc welding device and a nitrogen generation device; the welding vacuum chamber and the feeding vacuum chamber are provided with a piston sealing plate and a lifting sealing plate correspondingly; the electron beam welding device is arranged on the piston sealing plate, and the welding worktable can be overturned by 180 degrees and rotated by 360 degrees; the argon arc welding device is mounted on the piston sealing plate in a replaceable mode, and the nitrogen generation device can provide liquid nitrogen for a welding gun and a weldment for cooling; and the vacuum device is connected to the welding vacuum chamber and the feeding vacuum chamber for vacuumizing. Continuous production can be conducted without interrupts, the volumes of the vacuum chambers can be adjusted according to the size of the weldment, welding processes can be switched, a welding fume treatment device is arranged, thus the very environment-friendly effect is achieved, and production requirements of the modern novel vacuum welding equipment are met.

The invention discloses a process for welding medium-high carbon steel without cracking and deformation. The process comprises the following steps of: preheating a welding part to 85-100 DEG C before welding; welding by using a NiCrFe-3 welding rod; controlling the temperature of the welding part between 90 and 110 DEG C during the welding process; indirectly welding with short arc by using the roasted NiCrFe-3 welding rod; and carrying out integral insulating and aging treatment to the welding part after welding, wherein the insulation temperature is 60-80 DEG C. Medium-high carbon steel parts are welded by adopting the above welding process and the welding materials, and the preheating of the medium-high carbon steel parts and the roasting of the welding rod are carried out before welding, so that the cooling speed of the welding part in the follow-up welding operations is reduced and the internal stress in the welding joint is reduced; through the hammering to the welding portion during the welding process, the process can be used for refining grains and eliminating partial welding stress, and is beneficial to the fusion of the welding material and a base material; the problem of eliminating welding internal stress of the medium-high carbon steel in the welding process is solved, the fusion of the welding material and the base material during the welding of the medium-high carbon steel parts is improved, and the various performances of the welded medium-high carbon steel parts are equivalent to that of the original parts.