46results about How to "No welding deformation" patented technology

The invention relates to a submerged-arc welding technology of a big-thickness low-temperature steel plate with yield strength of 690MPa grade. The method comprises the following steps: (1) carrying out a welding cold crack sensitivity test on the steel plate to confirm the needed lowest preheating temperature; (2) adopting a welding groove with a symmetrical double-U shape, wherein the groove angle is 25-35 degrees, the thicknesses of truncated edges are 3-5mm, and the gaps between the truncated edges are 1-2mm; (3) adopting a welding wire with the tensile strength of more than or equal to 830MPa and the impacting energy of more than or equal to 100J at the temperature of -60 DEG C; (4) controlling the welding current to be 450-680A, the welding voltage to be 29-36V, the welding speed to be 38-50cm/ min, the weld heat input to be 15-40kJ/ cm and the flux baking system to be 350 DEG C*2.5h; (5) adopting gas shield welding with a single-sided welding and two-sided molding STT technology to carry out backing weld, and then carrying out unfolding submerged-arc welding until the steel plate is fully filled. All mechanical properties of a welding joint obtained by the method meet the requirements of the classification society, and particularly, a weld seam area and a welding heat affected zone can maintain higher low temperature impact toughness.

The invention relates to a processing method of a twisted guide rail. A cross section of the twisted guide rail is L-shaped; the lower surface of the twisted guide rail consists of a horizontal area and a plurality of sections of continuous inclined planes. The processing method comprises the steps of: a, adopting a forgeable piece as a blank; b. performing coarse processing, processing a reinforcing rib by making use of the material on the forgeable piece when performing coarse processing; c, after finishing the coarse processing, performing a hardening and quenching work procedure, a tire matching and shape righting work procedure and a nondestructive testing work procedure of a semi-finished product; d, semi-finish machining and straightening workpieces; e. finish machining: machining all of the surfaces into a finished-product dimension, retaining the reinforcing rib; f, surface quenching: sensing and heating by adopting semi-circle; g, removing the reinforcing rib, grinding and polishing; and h, performing nondestructive testing. The processing method is suitable for processing a slender slide rail that has a large length-width ratio, a surface quenching hardness HRC of 50-56, a tensile strength Rm of 1000-1150N/mm<2>, a cross section of an unstable geometrical shape and a sliding surface of a twisted surface.

The invention relates to a large damaged foundation bolt butt joint method comprising a special socket. The special socket is a hollow cylindrical cylinder, the upper end and the lower end of the socket are respectively provided with a reinforced hoop, and the diameter of the reinforced hoop is bigger than that of the socket. The method comprises the following steps: cutting off the damaged part of the damaged foundation bolt; polishing the burr on the cutting part until the cutting part is smooth; arranging a new foundation bolt at the cutting part, and sheathing the special socket to carry out butt joint to the new foundation bolt and the damaged foundation bolt; welding and fixing the joint of the new foundation bolt and the damaged foundation bolt as well as the joint of the new foundation bolt, the damaged foundation bolt and the socket. The invention is suitable for the basic direct embedded foundation bolt of electromechanical equipment, plant steel structure pillars, equipment bearing heavy load or vibratory shock and the like, has short construction time, and can ensure butted strength and verticality.

The present invention discloses a steering wheel for automobile and its production method. Said steering wheel includes a magnesium alloy skeleton wheel body containing ring upper portion wheel rim, lower portion base seat and several auxiliary ribs between them which are die-cast into one integrated structure, the upper portion wheel rim of small half-portion of said wheel body is covered with ABS covering layer, its exterior is covered with transferred layer with peach wood grain, and other portion of the described upper portion wheel rim is equipped with foamed layer, and the exterior of said foamed layer is covered with leather layer. Said invented product quality is reliable, and its appearance and hand feel can be obviously improved.

The invention discloses a welding protection device used for a thin-walled pipe. The welding protection device comprises a fastening casing pipe and a top cover. The first end of the fastening casingpipe penetrates into the thin-walled pipe, the second end of the fastening casing pipe clamps the second end of the thin-walled pipe, the outer wall of the fastening casing pipe cooperates with the inner wall of the thin-walled pipe, a first groove is formed in the inner wall of the fastening casing pipe in the axial direction of the fastening casing pipe, and the second end of the first groove communicates with an air pipe. A second groove is formed in the outer wall of the fastening casing pipe in the circumferential direction of the fastening casing pipe. Multiple through holes are evenly distributed in the bottom end of the second groove and communicate with the first groove and the second groove. The top cover is detachably connected with the first end of the fastening casing pipe, the outer diameter of the top cover is larger than the inner diameter of the fastening casing pipe, and the first groove is sealed. By means of the welding protection device, the problems that the welding space of the thin-walled pipe is limited and the welding efficiency is low are solved, the thin-walled pipe is expanded through the fastening casing pipe and a fastening pin, shielding gas is directly and evenly distributed into the second groove through the first groove, welding deformation of the thin-walled pipe is avoided, the defect that the welding space is limited is overcome, and the welding efficiency is improved.

The invention relates to the technical field of pantograph mounting, and discloses a welding tooling for pantograph mounting seat assembly welding and a pantograph mounting seat welding method. The welding tooling comprises a tooling framework and a planeness control unit and a height positioning unit which are mounted on the tooling framework, wherein the planeness control unit comprises a plurality of positioning plates which are arranged according to the number, the dimensions and the relative positions of pantograph mounting seats for a train for the city field; each pantograph mounting seat corresponds to one positioning plate in a jointing manner; the entire planeness of the planeness control unit is adaptive with the corresponding pantograph mounting seat; through holes are formed in the positioning plates to allow the pantograph mounting seats to be mounted; and the height positioning unit comprises a plurality of positioning columns which are equidirectionally arranged with the positioning plates on the tooling framework, the height of each positioning column is greater than the thickness of the corresponding positioning plate, and the height difference is equal to the distance difference between the upper surface of each pantograph mounting seat and the surface of a pantograph plate. The planeness control unit and the height positioning unit are combined, so that theplaneness of the upper surfaces of the planeness mounting seats can be effectively guaranteed to meet requirements.

The invention discloses a flame tube head machining device and method. An annular blank is adopted and placed in a forming die to form a U-shaped structure, then heat treatment is carried out, and flame tube convex hulls are formed through stretching. The machining device is adopted for clamping parts, end face turning machining is carried out, and the convex hulls are milled on the premise that aclamping device is not detached. When the convex hulls are milled, the convex hulls are pressed at intervals, the convex hulls which are not pressed are milled firstly, then the milled convex hulls are pressed, and therefore the remaining convex hulls are milled. The mode that the multiple convex hulls are milled at the same time is adopted during milling. The machining method is simple, the machining period is short, the machining cost is low, and the machining quality is good.

The invention belongs to the technical field of building overall structures and particularly relates to a construction method for connecting floor slabs and wall surface joints of a multilayer light steel structure building. The construction method is characterized by comprising the following steps of (1) modular production of floor slab structures of the light steel structure fabricated building,(2) modular production of wall surface structures of the light steel structure fabricated building, and (3) connecting forms of the different floor slabs and different wall surface structure modules.The joints are simple in structure and convenient to mount, integrity is good after completion, and connecting is firm, also durable and stable; seam mounting parts are concealed inside seams, thus the attractiveness of surface decoration is not affected, and the seams can also be arranged in the junctions of the wall surfaces and the floor slabs; the joints do not affect passing and connecting of water and electricity pipelines pre-arranged in the floor slabs; and through the connecting method of the joints, the problem that when the area of the single floor slab is large, the length and thewidth exceed the limits, and consequently, the floor slabs cannot be transported is solved.

The invention discloses a double-wire welding method and belongs to the technical field of welding. The welding method comprises the following steps that a welding groove is machined in each workpiece; welding grooves of the workpieces are assembled together; the welding grooves are welded through double-wire welding, a pulse welding mode is adopted by a front wire of the double-wire welding, thewelding grooves are welded for the first time, a cold metal transition welding mode is adopted for a rear wire of the double-wire welding, and second-time welding is performed on the welding grooves;and hydrogen removal treatment is carried out on each workpiece. According to the double-wire welding method, the welding efficiency can be improved, and the welding deformation can be reduced.

The invention discloses a high-efficiency and low-consumption dirt discharge system of a water washing tower. The system comprises a main body of the water washing tower, wherein the top of the insideof the water washing tower is connected with a waste gas discharge chimney through a waste gas guide pipe, a plurality of observation ports are arranged at the upper part of the outer surface of thewaste gas discharge chimney, a fan is arranged at the lower part of one side of the waste gas discharge chimney, and one side of the waste gas discharge chimney is fixedly provided with an observationplatform. The fan adopts means such as riveting and biting, the surface is clean and flat, a silencing-type box body of the fan adopts the assembly design of a frame and a box body, the frame is formed through stretching once by using an advanced metal cold bending machine unit, corrosion resistance is strong, an inner layer is a galvanized silencing micro-perforated plate, an interlayer is ultra-fine glass wool, and thereby the fan is especially suitable for places of large air volume ventilation and smoke discharge.

The invention discloses a chassis underframe welding integrated application system and a welding method. The welding method comprises the following steps that 1, all scattered workpieces of a front frame are respectively welded into assemblies, and then all the assemblies are welded into the front frame in a manner of conducting manual spot welding and robot full welding in sequence; 2, all scattered workpieces of a rear frame are welded into assemblies respectively, and then all the assemblies are welded into the rear frame in a manner of conducting manual spot welding and robot full welding in sequence; and 3, the front frame and the rear frame after full welding of a robot are checked, and repair welding is manually conducted on special dead angle positions where a welding gun of the robot cannot reach. According to a welding process provided by the invention, the frame welding deformation can be reduced, the welding method is suitable for welding a chassis underframe of an electric sweeper, and the frame welding efficiency and welding quality are further improved.

The invention relates to the technical field of milling cutter disc welding, in particular to a milling cutter disc welding fixture and a welding method applying the same and solves problems of weldment shape changing and dimensional accuracy reduction due to welding deformation in a welding process of a milling cutter disc. A cutter disc outer ring fixedly sleeves a cutter disc body, and a pre-tightening ring is connected with the cutter disc outer ring through a plurality of groups of threaded connectors and fixed to a base through a screw. The cutter disc body is provided with a plurality of groups of cutter grooves, and cutter disc positioning and clamping devices are arranged in the cutter grooves respectively and fixedly arranged on the base. By arrangement of the positioning and clamping devices in the cutter grooves of the cutter body, cutter groove wall positioning and clamping are completed in a welding process, so that welding deformation in the welding process is avoided; by adjustment of the positioning and clamping devices, control of welding deformation at any time in the welding process can be guaranteed, and the problem of uncontrollable welding deformation is solved.

The invention discloses an assembly-type optical fiber distribution frame, and the frame comprises a top plate, a bottom plate, two integrated rear vertical columns which are disposed between the top plate and the bottom plate and are perpendicular to the top plate and the bottom plate, two front vertical columns which are disposed between the top plate and the bottom plate and are perpendicular to the top plate and the bottom plate, and side plates which are disposed between the integrated rear vertical columns and the front vertical columns. The top plate, the bottom plate, the integrated rear vertical columns, the front vertical columns and the side plates form an optical fiber distribution frame with an accommodation space. The two front vertical columns are respectively connected with a door plate through a movable spring cotter. The interior of the accommodation space is sequentially provided with an optical cable fixing grounding protection device, a 19-inch module unit, and an optical fiber winding storage assembly. The frame saves the complex welding technology, saves time and labor, has no welding deformation, is accurate in structural size, can carry out the modular disassembly and maintenance of the body after a cabinet is accidentally damaged, is easy to modify, is convenient for engineering installation, is large in capacity, is convenient to convey, is quick in installation, is clear in wiring, and is convenient to operate.