201results about How to "Reduce welding heat input" patented technology

The invention provides a dynamic twin-wire three-arc welding method, belonging to the technical field of welding. The invention solves the problem that contradictions exist between improvement of deposition rate and reduction of heat input in the existing arc welding methods. The method is characterized in that a wire feeder is adopted to automatically feed a first welding wire and a second welding wire into two welding wire tips respectively and the included angle between the two welding wires is ensured to be 0-90 degrees; one output end of a first variable polarity power source is connected with one welding wire tip; one output end of a second variable polarity power source is connected with the other welding wire tip; after being connected with each other, the other output end of the first variable polarity power source and the other output end of the second variable polarity power source are connected with a workpiece to be welded; and the phase difference between output signals of the first variable polarity power source and the second variable polarity power source is 180 degrees. The welding method is efficient.

The invention relates to a stirring head and a welding method, in particular to a self-sustaining friction stir welding stirring head with an irrotational lower shaft shoulder and a welding method of the stirring head, which solve the problems that welding heat input is increased as a lower shaft shoulder of an existing self-sustaining friction stir welding stirring head rotates to generate heat, weld formation is difficult, and the mechanical property of a welding joint is low. A circular groove is machined at the center of the upper end face of a support base, a radial positioning bearing is mounted in the circular groove, the lower shaft shoulder is fixedly mounted on the upper end face of the support base, a stirring pin is longitudinally machined on the lower shaft shoulder, and the lower portion of the stirring pin penetrates through the stirring pin and is mounted on the support base through the radial positioning bearing during welding. The welding method includes: firstly, determining the size of the stirring head; secondly, fixing workpieces to be welded; thirdly, positioning the stirring head before welding; fourthly, determining the rotation speed of the stirring head and the pressing depth of an upper shaft shoulder; and fifthly, determining welding speed and welding the first workpiece to be welded and the second workpiece to be welded. The stirring head and the welding method are used for friction stir welding.

A stainless heat-proof self-protecting flux-cored wire for a magnesium smelting reduction tank belongs to the technical field of materials processing engineering. A normal stainless steel band 304L or common carbon steel serves as a coating layer, and alloys in a powder core are rutile, sodium carbonate, feldspar, compound fluorides, chromium, nickel, manganese, molybdenum, chromium nitride, aluminium-magnesium alloy, misch metal and iron power. Compared with a conventional stainless steel welding rod, the stainless heat-proof self-protecting flux-cored wire has the advantages that higher welding current can be used; higher welding speed can be realized; the production efficiency is improved; and the labor intensity is lowered; c. Compared with a conventional stainless steel submerged-arc welding solid wire, the stainless heat-proof self-protecting flux-cored wire has the advantages that all-position welding can be realized; the heat input is small; the slag detachability is good; and the manufacturing technique is simpler. A welded joint formed by using the stainless heat-proof self-protecting flux-cored wire provided by the invention has favorable heat resistance, oxidation resistance, vulcanization and corrosion resistance and high-temperature creep resistance compared with welded joints formed by welding the stainless steel welding rod and the stainless steel solid wire.

The invention discloses a method for overlaying a wear-resistant layer of a blade shroud of a turbine working blade. In the method, manual tungsten electrode argon arc welding is used, and the specific process parameters meet the requirements that: welding wires are selected from a T800 cobalt-based wear-resistant alloy welding wire which is researched according to a B50TF193 standard of AmericanGeneral Electric Company and an S-6 cobalt-based wear-resistant alloy welding wire which is researched according to an American metal society standard AMS5788; the diameters are phi 1.6mm and phi 1.2mm respectively; a mark and the diameter of a tungsten electrode are WCe20 and phi 2.0mm; the diameter of a nozzle is phi 12mm; welding current is between 20 and 25A; and the flow rate of protective gas is between 10L/min and 12L/min. By the method, the condition of incomplete penetration or over-melting of a Z-shaped gear switching part R is avoided, the problem of overheating of welding is also solved, and the occurrence probability of welding cracks is greatly reduced or avoided. The method completely meets the requirements of the wear-resistant layer in a high-temperature working state after welding.

Disclosed is a cold metal transition melting-brazing welding connection method for dissimilar magnesium metal and aluminum metal. Cold metal transition welding is adopted, argon is adopted as protecting gas, transition metal is a galvanized steel sheet, two types of welding wires are adopted, an aluminum-silicon welding wire is adopted on the aluminum side, and a magnalium zinc welding wire is adopted on the magnesium side. A welding gun is utilized to align to an aluminum edge and a magnesium edge, high-melting-point transition metal is clamped between magnesium and aluminum to stop mutual contact of liquid magnesium and liquid aluminum, so that melting-brazing welding connections between a magnesium melting welding joint and the transition metal (the galvanized steel sheet) as well as between an aluminum melting welding joint and the transition metal (the galvanized steel sheet) are realized, and connection of dissimilar metal between an aluminum alloy sheet and a magnesium alloy sheet is realized finally.

The invention discloses an aluminum honeycomb type evaporation plate and a processing molding method thereof. The evaporation plate adopts a high strength aluminum alloy plate and consists of an upper plate, a lower plate, an inlet pipe and an outlet pipe, wherein the two high strength aluminum alloy plates are overlapped and welded together by a solid-phase stir friction connecting method; the inlet pipe and the outlet pipe are inserted in the upper end and the lower end between the two high strength aluminum alloy plates and are connected with the high strength aluminum alloy evaporation plate body by using an electric arc welding method; and then the evaporation plate is finally molded through a mould and high-pressure bulging technology.

The invention provides an additive manufacturing device and method for a plasma arc gradient material of a bypass hot wire consumable electrode. The device consists of an MIG welding power supply, a bypass hot wire consumable electrode plasma arc welding gun, an IGBT shunt controller, a workpiece, a current sensor and a current controller, wherein the MIG welding power supply, the bypass hot wireconsumable electrode plasma arc welding gun, the workpiece and the current sensor define a closed circuit; the MIG welding power supply, the bypass hot wire consumable electrode plasma arc welding gun, the workpiece, the IGBT shunt controller and the current controller define a closed circuit. The additive manufacturing device efficiently improves conventional electric arc welding basically, is controllable in heat input, is high in welding electric arc restraint intensity, and has the characteristics of low cost, high efficiency, high stability and the like of electric arc additive manufacturing.

The invention provides a one-sided welding double-sided molding welding method which is suitable for welding a titanium steel composite pipe. The one-sided welding double-sided molding welding method aims at solving the problems that in existing titanium steel composite pipe welding, operation of the welding process is complicated, the accumulated heat input is large, it is necessary to prepare special welding consumables, and the welding efficiency is low. The one-sided welding double-sided molding welding method for the titanium steel composite pipe comprises the following steps that (1), a flat bottom groove with a blunt edge is machined at the pipe end of the titanium steel composite pipe to be welded; (2), a welding area is cleaned; (3), a titanium alloy layer of the titanium steel composite pipe is welded through a laser welding method; (4), acetone is used as a binder so that evenly-mixed transition layer metal powder can be made into paste, the groove bottom is evenly welded, pressing is conducted, and drying is conducted; and (5), transition layer metal is molten through laser energy, the transition layer is formed firstly, and then filling of the steel metal layer is conducted through electric arc welding. By the adoption of the method, one-sided welding double-sided molding welding of the titanium steel composite pipe is achieved, and the welding quality of the titanium steel composite pipe is improved.

The invention relates to a welding torch for arc welding, in particular to a twin-wire electrogas welding water-cooled welding torch, which comprises a first water-cooled welding torch and a second water-cooled welding torch which are mutually insulated, and an adjusting device for a distance between welding wires. The twin-wire electrogas welding water-cooled welding torch is characterized in that the adjusting device for the distance between the welding wires comprises a substrate and a feed screw nut mechanism arranged on the substrate; the first welding torch is fixed with the substrate; the second welding torch is fixed with a nut of the feed screw nut mechanism through a fixing plate; and the second welding torch is positioned above the first welding torch. The distance between the two welding torches is adjustable, an adjusting range for a welding condition is widened, proper current, voltage, welding speed and distance between the welding wires can be selected according to the thickness and materials of plates to be welded, and high quality welding lines are efficiently completed.

The invention discloses a stationary shaft shoulder assistant supporting inclined penetration friction-stir welding device and method, relates to a friction-stir welding device and method, and aims at solving the problem that an existing friction-stir welding method is difficult in avoiding a non-welding-on defect, or the problem that although the non-welding-on defect can be avoided, overlarge thermal input and other defects are caused. The friction-stir welding device provided by the invention comprises a long-needle stirring head, a stationary shaft shoulder with a blind hole, a translation sliding block, a linear guideway and a positioning clamping apparatus. During welding, the liner guideway, a welded workpiece and the positioning clamping apparatus are stationary, and the long-needle stirring head, the stationary shaft shoulder and the translation sliding block move along a welding direction, so as to realize a welding process. The stationary shaft shoulder assistant supporting inclined penetration friction-stir welding method provided by the invention comprises the following steps: 1, assembly of the device; 2, fixing of the long-needle stirring head and the stationary shaft shoulder; 3, friction-stir welding. The device and the method, provided by the invention are used for friction-stir welding.

The invention relates to the technical field of welding, and discloses a swinging laser filler wire welding method of a medium-thickness plate T-shaped joint fillet welding seam. In the medium-thickness plate T-shaped joint fillet welding process, by means of a laser beam which periodically swings in the welding direction and with the assistance of a filler wire, fillet welding seam welding is carried out, wherein the swinging direction is perpendicular to the welding direction. According to the swinging laser filler wire welding method of the medium-thickness plate T-shaped joint fillet welding seam, in the welding process, the laser beam swings periodically in a "I" shape and perpendicular to the welding direction, and a molten pool is uniformly stirred so as to widen the width of the welding seam, so that the large-size, large-penetration, high-efficiency and low-deformation welding process is achieved, and the adaptability of laser welding to plate gaps and the sensitivity of welding throat thermal cracks can be remarkably improved compared with a single laser.

The invention discloses a multi-power-supply parallel multi-wire high-efficiency electric arc welding device and application thereof. The device comprises a plurality of independent welding power supplies, a plurality of independent wire feeding mechanisms, a multi-wire welding gun which can be densely arranged, and contact tubes, wherein the welding power supplies, the wire feeding mechanisms, the multi-wire welding gun and the contact tubes are sequentially connected. The independent welding power supplies can be constant in voltage or current. Welding wires are driven by the independent wire feeding mechanisms respectively. The contact tubes can be multi-wire integrated contact tubes with bent channels or multiple embedded type contact tubes. The welding wire distribution mode of the multi-wire welding gun which can be densely arranged is determined according to requirements of the welding technology. In the welding process, the welding device is suitable for common welding wires and also suitable for cable welding wires and single welding wire and cable welding wire combinations. According to the device, the welding efficiency can be greatly improved, the welding production efficiency is greatly improved, the welding joint quality is improved, the consumption of welding materials is effectively reduced, and the device is especially suitable for narrow gap welding of thick-wall materials.

The invention discloses a double-heat-source collaborative welding method and device for large thermal conductivity mismatched metal materials, and belongs to the field of metal material welding. Whenwelding the large thermal conductivity mismatched metal materials, the method adopts two heat sources to simultaneously heat the front and back sides of joints and optimizes energy distribution of the joints by controlling energy parameters and positional parameters of the two heat sources, side heat input of high thermal conductivity metal is increased, the heat loss caused by the higher thermalconductivity is compensated, the low thermal conductivity metal side welding temperature is controlled, and the problem of large thermal conductivity mismatched metal material welding forming is solved and the joint welding quality is improved. The preheating effect of the joints is obtained by tilting the two heat sources on the front and back sides at a certain angle in the welding direction, and the single-pass welding double-sided forming of the joints is realized under auxiliary measures such as no chamfering and pre-weld preheating. The welding device can effectively adjust and controlthe heat distribution of the joints by precisely controlling the position of the welding heat sources in the three-dimensional space, and efficient and reliable connection of the large thermal conductivity mismatched metal materials is realized.

The invention relates to a welding method of a metal layer shaped composite board. The elding method of the metal layer shaped composite board is characterized by the following steps of 1, welded joint design, 2, wielding method design, 3, V-shaped strips preparation and filler wire selection and 4, welding sequence design. The wielding method design includes that the laser is utilized to weld I shaped grooves, middle truncated edge and weld grooves matching with the V-shaped strips; when the V shaped groove only has one layer of materials, the laser arc composite heat source is utilized to weld the weld grooves. The wielding method design includes welding the I shaped grooves and the middle truncated edge first and then the V-shaped grooves. Compared with the prior art, the welding method of the metal layer shaped composite board has the advantages that the welding method of the metal layer shaped composite board is high in welding quality, few in welding defects, is easy to operate and can increase welding efficiency.

The invention discloses a high-grade pipeline steel laser welding method and belongs to the technical field of advanced manufacturing. The method comprises the following steps of welding mode selection, groove machining, equipment parameter setting, welding robot welding programing, pre-welding preparation and laser welding. The high-grade pipeline steel laser welding method is quite suitable for one-step forming of long and straight welding seams of medium-thick material and backing weld of large-pipeline-diameter large-wall-thickness pipelines, and has the advantages of high laser energy density, high welding speed, low heat input, small deformation, high welding efficiency and the like.