45results about How to "Control heat input" patented technology

The invention belongs to the technical field of laser added material manufacturing, and relates to a method for preparing TiAl+Ti2AlNb composite materials by laser melting deposition. The laser melting deposition method is adopted to form the TiAl+Ti2AlNb composite materials; and the feeding quantity of Ti2AlNb is adjusted to achieve a pinning effect in composite material structures to improve overall plasticity of the materials. Meanwhile, circular samples are formed, and scanning paths are changed to concentric arcs to prevent the tensile stress of linear scanning paths of rectangular samples; and concentric circle openings on each layer are converted by 60-90 degrees, that is, the positions of scanning initial points on each layer are changed, so that the thermal stress concentration isreduced to prevent cracks. The heat input quantity in the forming process is controlled, and the substrate preheating temperature in the forming process is adjusted to slow down the formed metal solidification speed and cooling speed, so that the stress is released for a longer time.

Electrically-heated hose assembly including a hose and a first and a second fitting. The hose is constructed as having a core tube, a pair of spiral wound wires surrounding the core, and a jacket surrounding the core tube. A first end of each of the fittings is within a corresponding end of the hose, with a second end of the fittings extending beyond the hose end. The wires are wound around at least a portion of the second fitting end of a corresponding one of the fittings.

The invention relates to the field of thin-wall workpiece welding and discloses a method for controlling deformation generated when a connection pipe is welded to a large-diameter thin-wall barrel. According to the method, the amount of actual deformation is small. When the large-diameter thin-wall barrel is welded to the connection pipe connected with the large-diameter thin-wall barrel, an inner groove is adopted as a connection pipe groove in the barrel, and the two sides of the connection pipe groove in the barrel are provided with inner supports used for supporting the inner wall of the barrel; after the connection pipe is connected with the barrel through spot welding, the position of the connection pipe is adjusted, so that the connection pipe is located below the barrel, a circumferential welding line of the connection pipe is divided into an even number of welding line segments, welding of each welding line layer is completed through two rounds of segmented symmetry welding, welding of a half of each welding line segment in the length direction is completed in each round of segmented symmetry welding, and the next layer is welded after all the welding line segments on the upper layer are welded. The whole welding line is divided into a plurality of regions, a layered and regional welding sequence of the welding line is worked out, and therefore heat input is controlled well, welding deformation is reduced, and the problems that the large-diameter connection pipe droops and the barrel deforms are solved.

The invention discloses a double-sided forming welding process of FGB process one-sided submerged arc welding. The process comprises the steps of: S1, butt-jointing ground two to-be welded steel plates to from a groove; S2, adhering a liner; and S3, when the groove is a V-shaped groove, filling alloy powder and then covering the groove with sintered flux and when the groove is an I-shaped groove, covering the groove with sintered flux, and pulling a welding wire for submerged-arc welding for automatic primary formed welding through a submerged arc welding machine for the I-shaped groove or the V-shaped groove covered by the sintered flux, wherein the welding parameters are as follows: the welding current is 400-1200A, the welding voltage is 25-45V and the welding speed is 10-80cm/min. By improving the composition ratio of raw materials of the sintered flux, the alloy powder and the ceramic liner, different welding modes are adopted due to different thicknesses of the welded steel plates; angular deformation is effectively avoided on the basis of improvement of the welding efficiency, and the process has the beneficial effects of simple field operation and wide application range.

The invention discloses a double consumable electrode and single arc bypass coupled compound welding system and a welding method thereof. The compound welding system comprises a first welding machine, a second welding machine, a first welding wire and a second welding wire, wherein anodes of the first and second welding machines are connected with the first welding wire; the first welding wire and a workpiece form an arc; a cathode of the first welding machine is connected with the workpiece; the cathode of the second welding machine is connected with the second welding wire; and the second welding wire and the workpiece do not form the arc. By adopting the technical scheme provided by the invention, the melting efficiency of the welding wires is greatly promoted, high-efficient welding is realized, a stable welding process is realized, the heat input quantity of base metal is controlled, the possibility of occurring a welding defect is reduced, and the compound welding system is beneficial to acquiring excellent welding quality.

The invention discloses a control method and system for a pulse MIG (Metal-Inert Gas) welding electric arc. The method and the system disclosed by the invention has the advantages that the pilot-arc width or the pulse frequency of the pulse MIG electric arc is commonly controlled in a loop-opened feed-forward control mode of a welding-wire feeding speed signal and a loop-closed negative-feedback control mode of an electric arc length signal so as to maintain dynamic balance of the feeding speed and the fusion speed of welding wires and maintain constant electric arc length of the system and a constant jet transient mode of molten drops when welding current adjustment (by adjusting the wire-feeding speed), wire-feeding speed disturbance or arc length disturbance occurs. In addition, the invention also discloses a new process which adopts the method and the system and is used for controlling the fusion depth and the forming of welding seams by adopting a pulsating feeding mode for welding.

The invention discloses a double-wire pulse MIG welding power supply system based on LLC and a control method. The system comprises a three-phase alternating current input power grid, a host power supply module, a slave power supply module, a human-computer interface module and an arc load; the arc load comprises a host arc load and a slave arc load; the main power supply module is connected to the three-phase alternating current input power grid and the host arc load; the slave power supply module is connected to the three-phase alternating current input power grid and the slave arc load; andthe human-computer interface module is connected to the host power supply module and the slave power supply module, and the host power supply module and the slave power supply module are same in structure and are formed by N subsystems in parallel. The control method is the double-wire pulse phase control comprising synchronous phase, alternating phase and independent phase. According to the system, the advantages of being high in cladding efficiency of double-wire pulse MIG welding and high in electric energy conversion efficiency of a LLC resonant converter are combined, so that any switching of the output of three-phase pulse waveform is realized.

The invention provides an installing and clamping tool and a method for conducting capillary tube welding through the installing and clamping tool. The installing and clamping tool is used for accurately installing and clamping a capillary tube. The method for conducting capillary tube welding through the installing and clamping tool includes the steps of selecting of argon tungsten-arc welding equipment, workpiece pre-welding washing, installing and clamping of a welding protective device, installing and clamping of a tool mold, installing and clamping of a workpiece, adjusting of a gas flow control device, programming of a welding procedure, workpiece welding, weld joint quality detecting and the like. In addition, in order to achieve welding, high-quality welding of the capillary tube is achieved through the gas flow control device and the welding protective device in the welding process, and wide application prospects are achieved in the field of capillary tube welding.

The invention relates to an arc welding method adopting an external sound pressure mode and a device, and the arc welding method aims to provide a gas shielded welding device of a complex method which can realize stable process, high welding formation quality and greatly improved welding efficiency. The device consists of an acoustic energy transducer (2), an acoustic amplitude-change rod (3), a protective gas injecting nozzle (4), a welding electrode clamp (5), an acoustic generation source (9) and a welding source (8). Under the non-melt electrode mode, the arc welding method has the advantages of stable welding process, improved weld penetration of a single-pass weld and high welding formation quality, as well as realization of high effective welding under the common non-melt electrode welding environment. When being used under the melt electrode mode, the arc welding method has the advantages of greatly improved welding efficiency, effective control of welding heat input quantity, changed weld penetration due to the changed acoustic frequency, the protective gas injecting nozzle, the welding height and other parameters, and effective control of solidification and crystalline state of the molten metal.

An arc welding/brazing process is disclosed that is useful to join together a first copper piece and a second copper piece without damaging more heat-sensitive materials that may be located nearby is disclosed. The arc welding/brazing process includes using a non-consumable electrode wire, which electrically communicates with a weld control in a straight polarity orientation, to strike an arc across a gap established between a leading tip end of the electrode wire and the first copper piece. The current that flows through the arc when the arc is established heats the first copper piece such that the first copper piece becomes joined to a second copper piece. The joint between the first copper piece and the second copper piece may be an autogenous weld joint or a braze joint.

The invention relates to an arc voltage track pulse submerged-arc welding control method, a control circuit and a welding machine. The arc voltage track pulse submerged-arc welding control method is as follows: a voltage is output by adopting an arc-pressing track mode, and the pulse current is controlled according to the change of the arc voltage. The control circuit comprises a voltage giving unit, a frequency adjusting unit, an arc voltage tracking unit, a peak basic value adjusting unit and an inverter unit, wherein the voltage giving unit and the arc voltage tracking unit are respectively connected with the frequency adjusting unit which is connected with the peak basic value adjusting unit and the inverted unit in sequence. According to the invention, the heat input quantity can be controlled effectively, the common defects of incomplete fusion of the root and the like during the welding of a first welding seam can be effectively, the welding quality and the welding efficiency are improved, furthermore, the control circuit is simple, the implementation cost is low, the manufacturing process is simple, and the performance is stable.

The invention belongs to the technical field of heat-resisting steel welding, particularly relates to a repairing method of a high-chromium martensite heat-resisting steel casting, and provides a welding and repairing method of a novel heat-resisting steel casting. The method comprises the main steps of defect treatment before welding, welding preheating, welding, heating after welding, and heat treatment after welding. By the adoption of the welding and repairing method, generation of weld cracks is reduced, the yield of welding and repairing is increased, the number of times of welding is reduced, and the repairing cost is reduced substantially.

The invention provides a flat-overhead position hybrid welding technique and device for an aluminum alloy spiral pipe and belongs to the technical field of automatic welding. A spiral pipe blank rolling device, two pairs of rotating rollers, a first TIG welding gun, a second TIG welding gun and a plasma welding gun are arranged on a machine frame of the device. Under the positioning of the two pairs of rotating rollers, an aluminum alloy sheet is rolled into a spiral pipe blank with the required diameter according to a certain thread line through the spiral pipe blank rolling device firstly, and then fixed-length point fixing of the spiral pipe is conducted through the first TIG welding gun; then welding in an internal overhead welding position by the plasma welding gun and welding in a flat welding position of the spiral pipe by the second TIG welding gun are conducted synchronously; and plasma welding and second TIG welding are conducted synchronously through pulses, the plasma welding gun sprays cold argon gas to cool weld joints when the pulses are ended, cooling is conducted while welding is conducted, and finally automatic welding of the aluminum alloy spiral pipe is achieved. By the adoption of the flat-overhead position hybrid welding technique and device for the aluminum alloy spiral pipe, the welding efficiency of the aluminum alloy spiral pipe is improved easily, welding deformation of the spiral pipe is reduced, and the quality of a welded product is guaranteed.

The invention discloses welding equipment of a lead-acid storage battery connecting end. The welding equipment comprises a friction welding machine, a plate electrode assembly box, a welding fixture and a lifting conveying device; the welding fixture is arranged at the upper part of a bracket; the plate electrode assembly box is arranged at the middle part of the welding fixture; the lifting conveying device is arranged in the bracket and is located at the lower part of the plate electrode assembly box; guide rails for conveying the plate electrode assembly box are arranged on the two sides ofthe welding fixture; and the friction welding machine is arranged at the exterior of the bracket. By adopting a friction stir welding method, heat input in the welding process is controlled well, welding can be conducted simply by heating a welding position to a plastic state, no lead steam is generated, the production environment is improved, the internal resistance of the storage battery is reduced, the service life of the storage battery is prolonged, and automatic production is realized.

The invention discloses a robot double-wire four-pulse novel welding method. The robot double-wire four-pulse novel welding method comprises a control part, a wire feeding part, two pulse welding power sources which communicate with each other and a welding gun. The method comprises the following steps that the wire feeding part is used for arranging two welding wires at the welding position in afront-and-back mode at a certain angle; the control part controls the two pulse welding power sources, so that the current provided by a frontward wire is larger than the current provided by a backward wire; and the control part further controls the wire feeding part to provide the same or different wire feeding speeds of the frontward wire and the backward wire, and the pulse welding power sources are controlled to use four independent pulses to provide welding current to the welding wires. The method is wide in control range, attractive in welding effect and high in quality.

The invention relates to a valve seat and valve body welding process and specifically relates to a valve seat and valve body assembly welding process for a supercritical thermal power unit. The positive effect of multilayer welding is fully utilized; by utilizing multi-layer welding, the following layer has the effects of hydrogen removal and heat affected zone microstructure improvement on the previous layer. The method of relatively rapid welding of small welding current is used for controlling thermal input; thermal input of welding is strictly controlled; high-strength steel is relatively sensitive to thermal input of welding and excessive thermal input causes reduction of the toughness of a welding joint and reduces the anti-cracking performance. After-heat treatment is performed immediately after welding, so that the problem that cold cracks appear some time after welding is solved and the welding requirement is met. The welding process completely solves the problem of difficulty in welding of WB36 and F6a dissimilar steel, prevents post-welding cracking and can totally guarantee the welding quality.

The invention relates to nickel-based alloy welding powder as well as a manufacturing method and a using method. The nickel-based alloy welding powder comprises the following components by mass: 0.40%-0.60% of C, 2.30%-2.60% of Si, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, 27.0%-32.0% of Fe, 0.10%-0.40% of Cu, 0.01%-0.06% of Ce, 0.01%-0.05% of Y and the balance Ni. The invention further discloses the manufacturing method and the using method of the nickel-based alloy welding powder. The nickel-based alloy welding powder is reasonable in design, low in weld joint hardness and small in cracking risk, preheating is not needed before welding, and heat treatment is not needed after welding.