733results about How to "Low heat input" patented technology

An electric arc welder for performing a pulse welding process by a current between an advancing electrode and workpiece where the welder comprises a short detecting circuit for creating a short signal upon occurrence of a short circuit between the advancing electrode and the workpiece and a boost circuit to create a plasma boost pulse after the short circuit is cleared during the time period when the welder is not outputting the peak pulse current.

A cryostat configuration for keeping cryogenic fluids in at least one cryocontainer, comprising an outer shell and a neck tube containing a cold head of a cryocooler, wherein the coldest cold stage of the cold head is disposed in a contact-free manner relative to the neck tube and the cryocontainer, and wherein a cryogenic fluid is located in the neck tube, is characterized in that the neck tube is disposed between the outer shell and a cryocontainer and/or the radiation shield, the neck tube is closed in a gas-tight manner at the end facing the cryocontainer and/or the radiation shield, the neck tube is coupled to the cryocontainer and/or a radiation shield disposed between the cryocontainers or a cryocontainer and the outer shell, via a connection having a good thermal conductivity, the neck tube comprising a fill-in device at an end located at ambient temperature. This permits efficient heat transfer between the cryocooler and the cryocontainer with little vibration, while simultaneously ensuring great safety during maintenance work without discharging the magnet.

A motor stator (24) has a stator iron core (24a), a stator winding (24b), and a mold member (30) embedding them in an inner portion and having a high coefficient of thermal conductivity. The mold member (30) has a heat insulating layer (32) closely attached to an inner surface thereof surrounding a motor rotor (22) and to an outer surface thereof in an axial direction. Further, an outer sleeve (26) is provided so as to be closely attached to an outer peripheral surface of the mold member (30) and to an inner surface of a bearing housing (16). The outer sleeve (26) forms a liquid tight water cooling jacket (26b) between the outer sleeve and the bearing housing.

The invention discloses an aluminum alloy workpiece additive manufacturing method implemented through friction stir welding. On the basis of an existing electric arc additive manufacturing aluminum alloy workpiece, the characteristic that aluminum alloy is soft in property is combined, after an aluminum alloy workpiece is manufactured from electric arc additives layer by layer, friction stir welding intensification treatment is conducted on each layer, and therefore, defects such as pass gaps, interlayer incomplete fusion, air holes and the like can be eliminated through friction stir weldingwhen each layer is manufactured. Compared with the pure electric arc additive manufacturing aluminum alloy workpiece, by means of the method, the structural state of the aluminum alloy workpiece obtained through additive manufacturing can be improved; the grains can be finer; second-phase grains are finer and are distributed more uniformly; and the dislocation density achieved in the aluminum alloy additive manufacturing workpiece is increased. Compared with existing friction stir welding intensification, grain refining and defect elimination are conducted on each layer of the workpiece so that the strength of the whole workpiece can be improved rather than only surface modification, namely surface intensification, is conducted.

The invention relates to a novel laser spot welding method, in particular relates to a laser pulse spot welding method for a metal sheet, aiming at solving the problems that in the prior art, the burning loss of the material is high, air holes, cracks and collapse are easy to generate in the laser spot welding process, and particularly the reflectivity of the aluminum alloy material to laser is high so that the stability in the spot welding process is poor. The laser pulse spot welding method for a metal sheet comprises the following specific steps: (1) preprocessing a workpiece to be welded, (2) fixing the workpiece to be welded, and (3) welding by adopting the laser pulse spot welding method. The laser pulse spot welding method for a metal sheet has the advantages of enhancing the welding efficiency, improving the welding spot quality, ensuring good uniformity of the sizes of the welding spots and realizing the spot welding of a plate of moderate thickness by a small-power laser. The laser pulse spot welding method for a metal sheet is mainly used for welding metal materials and particularly used for welding the metal sheet.

The invention discloses an auxiliary wire filling GMA additive manufacturing device and method for gradient material manufacturing. The device comprises a GMAW arc welding power source, a wire feeder, a GMAW welding gun, two wire guiding nozzles and two auxiliary wire filling wire feeders. The wire feeder is used for conveying a consumable electrode welding wire, and a feeding hose of the wire feeder is connected with the GMAW welding gun. The GMAW welding gun is vertically arranged over a molten bath and used for guiding the consumable electrode welding wire into the molten bath, and the generated arc is located between the consumable electrode welding wire and the molten bath. The two auxiliary wire filling wire feeders are used for conveying homogenous filling welding wires and heterogeneous filling welding wires, and feeding hoses of the two auxiliary filling wire feeders are connected with the two wire guiding nozzles correspondingly. The two wire guiding nozzles are fixed to the front end of the GMAW welding gun and used for guiding the homogenous filling welding wires and the heterogeneous filling welding wires to be fed into the molten bath. The auxiliary wire filling GMA additive manufacturing device and method solve the problem that in the traditional GMA additive manufacturing process, heat accumulation of a formed part is serious, and continuous component adjustment cannot be achieved.

The invention relates to a laser-MAG welding method for a steel plate of medium thickness and superhigh strength and aims at solving problems existing in steel plates of medium thickness and superhigh strength in the laser-MAG composite welding. The method comprises the following steps: 1, before welding, fixing a machining clamp to a position to be welded of a workpiece to be welded; 2, rigidly fixing a laser head and an MAG welding gun; 3, setting welding parameters; 4, adopting a robot integrated system for controlling the welding parameters, wherein firstly, an MAG electric arc is generated, after the electric arc is stabilized for 1-2 seconds, a laser device is controlled to emit laser, and finally a robot is controlled so that the laser working head and the MAG welding gun can move jointly to complete the welding process. The welding method is applied to the field of material processing engineering.

A cryostat (1) with a first helium tank (4) which contains helium at an operating temperature T₁<3 K, and a second helium tank (2) which is connected to the first helium tank (4) and contains liquid helium at an operating temperature T₂>3 K, wherein a cooling means (6) is provided in the first helium tank (4) which generates an operating temperature T₁<3 K in the first helium tank (4), wherein the cooling means (6) is designed as a Joule-Thomson valve with downstream heat exchanger from which pumped helium is transported to a room temperature region outside of the cryostat (1) is characterized in that a refrigerator (11) is provided whose cold end (19) projects into the second helium tank (2) and the supplied helium is returned during normal operation in a closed loop along the refrigerator (11) and into the second helium tank (2), thereby being pre-cooled and liquefied at the cold end (19) of the refrigerator (11). The inventive cryostat minimizes helium consumption, thereby permitting continuous measuring operation.

A desalination greenhouse of the invention provides both winter and summer crop growing operations and to produce a source of potable water given an input of only brackish or sea water. A consistency of temperature is produced by insulation and compensating absorption of heat in summer, with the release of heat in winter to keep crops more isothermal, but without obstructing natural light transmission to the crops. A very thin layer of brackish or salt water is evaporated from an inner shell and condensed onto an outer shell. Supplemental heat exchange can be applied to cool water used for crop irrigation.

A method and apparatus for conditioning ambient air for use in an enclosure is disclosed which cools the ambient supply air stream in sensible energy recovery device or cools and dehumidifies the ambient supply air stream in an enthalpy energy recovery device. The thus cooled air is then cooled by a cooling coil of a refrigerant cooling system to reduce its temperature and humidity. The thus cooled and dehumidified air is then passed through a segment of a rotating desiccant wheel or through a different type of desiccant dehumidification device under conditions which reduce its moisture content and increases its temperature. The supply air is then delivered from the desiccant wheel to the enclosure. The desiccant wheel is regenerated by heating a separate regeneration air stream, provided by the exhaust air from the space and using the condensing coil of the refrigerant system to increase the regeneration air stream temperature. The thus heated regeneration air stream is then passed through another segment of the rotating desiccant wheel to regenerate the wheel and is exhausted to the atmosphere.

The invention relates to a method for preparing a ceramic-based composite material environment barrier coating by laser cladding, which has the technical characteristics that: 1, a composite material to be coated is processed to a required size and completely washed in an ultrasonic washing machine; 2, the environment barrier coating material powder, a bonding agent and a solvent are mixed uniformly according to a certain ratio to form pulp; 3, the pulp is uniformly brushed on the surface of the composite material and dried; and 4, the membrane coated with the coating pulp is placed on a laser processing worktable, laser cladding is performed by a certain process, and thus, the environment barrier coating is prepared. The interface of the obtained coating is firmly bonded, the coating is uniform and compact, and the quality of the coating is improved obviously. In the invention, the process is simple, area-selectable cladding can be performed, the processing period is short, and high-performance environment barrier coating can be prepared.

The invention discloses a butt-jointing and welding method of plates. The bases of the grooves of two plates which need to be welded are butt-jointed closely and are fixed in the groove through spot welding. A ceramic pad is stuck at the bottom of the butt-jointing place by an aluminum foil. Two parallel and separated thin welding wires are used to treat welding seam by submerged arc-welding. The butt-jointing and welding method effectively shunts the welding current to the two thin welding wires, not only improves the melting efficiency of the welding wire, but also avoids the excessive concentration of the active force of electric arc, not only has high welding efficiency, but also is easier to achieve a balance state to form the welding seam under the support of surface tension and the ceramic pad.

A desalination greenhouse includes a method of fresh water production hybridized with growth and production of a crop. The co-location of a growing crop can provide additional economic incentive to a hybrid system, and provide a moisture enhancement to an internal atmosphere which can be utilized to more efficiently produce and yet benefit from the production of water without the salt content, and as well to concentrate the salt content of brine which is used in another salt production operation. A further substantial achievement could be obtained by desalinization of water by using renewable energy economically and saving 95% of water normally used in open field irrigation of crops.

The invention discloses a dedicated welding active agent for deep penetration TIG welding. The welding active agent is composed of, by mass, five percent to 15 percent of NaCl powder, 10 percent to 20 percent of CaO powder, 15 percent to 20 percent of MgF2 powder, 10 percent to 15 percent of Fe2O3 powder, seven percent to 10 percent of SiO2 powder, eight percent to 10 percent of TiO2 powder, 17 percent to 20 percent of Cr2O3 powder, four percent to five percent of La2O3 powder and four percent to five percent of Y2O3 powder. The using method of the active agent comprises the steps that calculation is carried out according to the mass percent, 92 percent to 95 percent of the powder of the dedicated welding active agent for deep penetration TIG welding is mixed with five percent to eight percent of acetone to form the pasty or grease-shaped welding active agent, the surface of a workpiece is evenly coated with the welding active agent through a brush, and welding is carried out after the acetone is fully volatilized. According to the welding active agent, complete penetration is achieved on AISI316 austenitic stainless steel and X70 pipeline steel with the thickness of 14 mm through deep penetration TIG welding, the welding process is simplified, a coarse structure is avoided, the mechanical property of a welding joint is improved, production efficiency is improved, and production cost is lowered.

The invention discloses a condensation electric arc welding gun, which belongs to the technical field of welding equipment. A tungsten electrode is closely embedded in the center of an electrode holder; the electrode holder is sleeved in the center of a main connector through thread; the root part of the electrode holder is mutually engaged with the main connector by using an inclined surface, so that water cooling effect to the electrode and no leakage are guaranteed; a ceramic nozzle is sleeved on the periphery of the main connector through threaded connection; a protective gas laminar flow screen is a stainless steel wire net which is fixed on the other end face of the main connector through an O-shaped steel wire spring, so that protective gas forms laminar flow; a water outlet pipe, a water inlet bushing or a gas inlet bushing is provided with a cable connecting end; the water inlet bushing is coaxially sleeved outside a water outlet straight pipe; and the gas inlet bushing is sleeved outside the water inlet bushing, a water inlet passage is remained in the middle of the gas inlet bushing and the water inlet bushing, and the gas inlet bushing and the water inlet bushing are welded on the same end face of the main connector to form a water cooling passage and a gas protection passage. Apart from the ceramic nozzle, all the remaining materials are conductors. According to the condensation electric arc welding gun, the free electric arc energy intensity can be improved, and better capacity of controlling welding joint formation is achieved.

The invention relates to a laser-electric arc composite heat source high-speed welding method of ultrahigh strength steel, belonging to the technical field of high-strength steel welding. The traditional laser-electric arc composite heat source high-speed welding method of the high-strength or ultrahigh strength steel has overhigh welding linear energy due to low welding speed and large energy input so as to cause the deformation of a welding workpiece; in addition, chevilled silk spacing is overlarge, and stabilization action realized by a laser is reduced because the laser is adopted firstly and the electric arc is adopted subsequently so that a welding process is unstable and easy to generate splashing. The invention adopts laser-electric arc composite heat source welding; the welding workpiece is the high-strength steel or the ultrahigh strength steel; an electric arc welding gun is used for welding firstly and a laser nozzle is used for welding subsequently during welding; the current of electric arc welding is 140-180A, and the voltage of the electric arc welding is 23-25V; an included angle theta between the electric arc welding gun and the surface of the workpiece is 60-65 degrees; the laser power is 3-5kW; the welding speed v is 1-3m/minute; and the chevilled silk spacing h between a laser beam and a welding stick is determined within a range of 1-3mm. The invention realizes the welding of the ultrahigh strength steel without preheating, cold cracks or deformation.

The invention discloses a static double-shaft-shoulder stirring friction head used for a stirring friction welding machine. The static double-shaft-shoulder stirring friction head comprises a stirring needle, an upper shaft shoulder and a lower shaft shoulder assembly, wherein the upper shaft shoulder is sleeved at the upper portion of the stirring needle, and the lower shaft shoulder assembly is sleeved at the lower end of the stirring needle. The lower shaft shoulder assembly comprises a lower shaft shoulder, an installation block with an internally-embedded bearing, a plane bearing and a locking nut, wherein the lower shaft shoulder is connected with the installation block and is sleeved at the lower end of the stirring needle, the plane bearing is sleeved at the tail end of the stirring needle and can rotate along with the stirring needle, and the locking nut is sleeved on the stirring needle and locks the plane bearing tightly. The upper shaft shoulder is fixed on a machine head of the welding machine. The upper shaft shoulder and the lower shaft shoulder are static relative to the stirring needle, thermal input of the stirring friction head on a welding seam is reduced effectively, and welding quality is further improved.

The invention relates to a laser and electric arc combined welding method for thick high-strength steel plates and a clamp for the method. A 45-mm thick high-strength steel is welded with a 6-KW fiber laser and through a double-sided welding forming method, small double-sided grooves are opened, and a 1mm-1.5mm gap is reserved, accordingly, the 45-mm thick high-strength steel can be completely welded. Compared with traditional multi-layer multi-pass welding which requires at least 20 passes of welding, the combined welding method has the advantages that the progress is apparent, preheating processes are simplified, preheating time is shortened, and welded joint performances reach client required indexes; the production efficiency is improved apparently, consumption of base metal and welding wires is reduced, energy consumption is decreased, the mechanical property of welded joints is improved, the residual stress and the deformation are reduced, automation of production can be easily achieved, and the like. The special clamp is a combined clamp with four pressing plates arranged on the upper portion and a base plate used on the lower portion during welding so as to improve the efficiency and quality of the welding method. By means of the clamp, a workpiece can be positioned and fixed, the welding quality is guaranteed, and the workpiece cannot be abraded.