41results about How to "Reduce weld defects" patented technology

The invention belongs to the field of metal welding, and particularly relates to an automatic ultrasonic impact device for a circumferential weld, which is used for improving stress distribution of a welded joint of the circumferential weld of a pipeline and a pressure vessel, and improving overall performance of the welded joint. The device comprises an annular guide rail, a traveling mechanism and a stress relieving mechanism, wherein the annular guide rail surrounds and is fixed outside the pipeline or the pressure vessel, and is used for supporting the traveling mechanism, the traveling mechanism is installed on the annular guide rail and can conduct a circular motion around the annular guide rail, and the stress relieving mechanism is fixed at one side of the traveling mechanism, and can respectively relieve the stress of weld toes at two sides of the circumferential weld through ultrasonic impact under the driving of the traveling mechanism. The device can complete the work of relieving the stress of the circumferential weld of the pipeline and the pressure vessel through ultrasonic impact, reduces weld defect, eliminates residual stress at the weld toes, and improves the post-weld treatment efficiency; in addition, the device is simple to assemble and disassemble, can be regulated according to different pipe diameters, and is applicable to stress relieving of the circumferential welds of different pipe diameters.

The invention relates to a double side dual-arc welding method. It includes the following steps that the work-piece connection part waited for welding is made both sides welding groove; the both sides welding groove and its both sides surface is ground and cleaned out before the welding; the two independent electric arcs elicited by two welding guns of the two welding machines are conducted both sides dual-arc symmetry bottoming welding respectively at the both sides welding groove; after the bottoming welding, the two independent electric arcs are conducted both sides dual-arc filling welding respectively at the both sides welding groove. The invention avoids the carbon arc-air gouging back gouging process, simplifies the welding process, so that the automation welding can be realized. It avails to practice gas shielded welding, ensure the welding quality, reduce the welding deformation, and decrease joint stress. The method can apply to important metal structural parts welding.

The invention provides a lithium ion battery liquid injection hole sealing structure, which includes a top cover plate, a sealing ring and a weldable sealing nail; a straight wall liquid injection hole is opened on the top cover plate; the sealing nail includes an insertion injection hole The nail body in the liquid hole and the nail cap welded to the top cover plate; the sealing ring is fixed on the nail body of the sealing nail and is located between the top cover plate and the sealing nail. Compared with the prior art, the sealing structure of the liquid injection hole of the lithium ion battery of the present invention realizes the advantages of easy welding, less weld defects, high production efficiency and easy detection of the weld by assembling the seal ring and the seal nail into an integrated seal nail. .

The invention discloses a device and a method for welding a bourdon tube for a pressure gauge, and belongs to the field of pressure gauge production. The device comprises a base, a gas feeding tube, a water ejection tube, a first groove and a second groove, wherein the first groove and the second groove are formed in the base; one end of the second groove is vertically connected with the first groove; the gas feeding tube is fixed on the base; one end of the gas feeding tube is arranged in the second groove; the water ejection tube is arranged on the base. By the adoption of the device, a gas can be supplied in welding, so that through holes are prevented from being blocked, and meanwhile due to arrangement of the water ejection tube, weld seams can be conveniently cooled down, and meanwhile due to addition of special substances in water in the welding method, the anticorrosion effect can be achieved, and the welding defects can be greatly reduced.

The invention discloses a cylindrical no-root full-penetration union melt welding method. The method comprises the following steps: a beveling step: one-way grooves of 45+-2 degrees with depths of 4-12 mm are formed in four edges, near the outer side of a cylinder, of a steel plate; a cylinder molding step: the steel plate is wound according to the diameter, the alignment tolerance and the welding line gap not more than 1 mm, or is in butt joint to form a cylinder in radial direction after winding, and a V-shaped welding line is formed on the outer side surface; an outer side groove bottoming step: the groove at the outer side of the longitudinal or annular gap of the cylinder is bottomed according to a filling thickness of 3-4 mm by manual arc welding or gas shielded welding; an inner side union melt welding step: the union melt welding is performed for the welding line at the inner side of the cylinder according to a welding layer filling thickness of 2-4 mm and cover surface weld reinforcement of not more than 2.5 mm; and an outer side union melt welding step: the union melt welding is performed for the welding line at the outer side of the cylinder according to the cover surface weld reinforcement of 1-3 mm. The method has the characteristics of smooth welding lines, high welding efficiency, stable quality and no open arc irritation and noise pollution.

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.

The invention discloses a laser welding fixture and method. The laser welding fixture comprises a supporting rod, a positioning plate, U-shaped rotation arms and pressure covers; the supporting rod isarranged in the vertical direction, and the top end of the supporting rod is provided with the positioning plate in the horizontal direction; the upper surface of the positioning plate is provided with a storage groove, and the two sides of the positioning plate are provided with the U-shaped rotation arms; the pressure covers are installed on the U-shaped rotation arms; and driving devices are installed on the lower portions of the U-shaped rotation arms and used for driving the U-shaped rotation arms to rotate and do vertical reciprocating motion. The laser welding method comprises the following steps that a laser welding head is started, the U-shaped rotation arms on the fixture are started to rotate at the same time, and thus, the U-shaped rotation arms of the fixture rotate while thewelding head does rotary welding so that welding of an annular welding zone can be achieved at a time through the welding head; and a pressure sensor on the fixture can measure the pressure value applied to the pressure covers. According to the laser welding device and method, the welding sealing performance is good, and the welding efficiency is high.

The invention discloses automatic butt welding equipment for bimetal composite pipes and belongs to the field of oil and gas pipelines. The equipment mainly comprises clamping devices, conducting devices, a hydraulic source connecting device, support adjusting devices, a ceramic ring, and an electric propulsion unit. A movable bimetal composite pipe to be welded is disposed on the support adjusting devices. The end, to be welded, of the movable bimetal composite pipe to be welded corresponds to the end, to be welded, of a fixed bimetal composite pipe to be welded. Horizontal center lines of the two pipes are coaxial. A set of clamping devices is disposed on the outer periphery of each of the butt-welded end of the movable bimetal composite pipe to be welded and the butt-welded end of the fixed bimetal composite pipe to be welded. The automatic butt welding equipment for bimetal composite pipes has the advantages that the bimetal composite pipe can be butt-welded on the site quickly and conveniently, weld defects are less, weld failure accidents are less, and the equipment is simple in structure, convenient to operate and faster for construction.

The invention belongs to the technical field of an aluminum alloy welding and relates to a welding technology of a fully-enclosed aluminum alloy anti-roll multifunctional cabinet externally arranged at a heavy truck. The fully-enclosed aluminum alloy anti-roll multifunctional cabinet comprises a bottom plate, a top plate, a rear plate and side plates; the top plate is fixedly arranged on the frontside of the bottom plate; the rear plate is fixedly arranged on the rear side of the bottom plate;, the side plates are fixedly arranged on the left side and right side of the bottom plate correspondingly; a cuboid is defined by the bottom plate, the top plate, the rear plate and the side plates; lifting lug plates are fixedly arranged at the four corners of the cuboid; a door plate is buckled onthe four corners of the cuboid; reinforcing ribs are arranged at the four corners of the door plate in a crossed manner; and a bottom section is fixedly arranged under the bottom plate. In the welding process, the top plate, the rear plate and the bottom plate are welded with the side plates correspondingly, the bottom section is welded with the bottom plate, the lifting lug plates are welded with side plates and the bottom section, and door plate is welded with the reinforcing ribs at four welding stages correspondingly, so that the problems that energy conservation and emission reduction are not facilitated and the corrosion resistance can not meet the requirement since an existing vehicle-mounted multifunctional cabinet and anti-roll beams, which are made of carbon steel and steel plate materials, are heavy are solved.

The invention discloses a method of welding a framed aluminum alloy vehicle body roof. The method includes the steps of welding a back side upper assembly, a left side upper edge beam assembly, a right side upper edge beam assembly, a roof front cross beam assembly and a rear water runner assembly successively; fitting all the above assemblies to a positioning tool, and fixing by spot welding; welding preset seams among the above assemblies to finally form the framed aluminum alloy vehicle body roof. Judging preset seam lengths is performed during welding; if the preset seam lengths are greater than a set length, symmetric backward welding or segmental skip welding is performed from the middle of each preset seam to its two sides; otherwise, welding from one end of each preset seam to itsother end is performed. The method herein can provide effectively reduced welding deformation and ensure seam quality and dimensional precision of a body vehicle roof.

The invention discloses aqueous cleaning low-temperature welding paste and a preparation method thereof. The welding paste comprises the following components in percentage by weight: 85 to 90 percent of soldering alloy powder, and 10 to 15 percent of scaling powder, wherein the soldering alloy powder consists of the following components in percentage by weight: 36 to 44 percent of Pb, 18 to 22 percent of Bi and the balance of Sn; and the scaling powder is formed by mixing 2 to 10 weight percent of active agent, 1 to 10 weight percent of pasting agent, 20 to 30 weight percent of wetting agent, 2 to 10 weight percent of thixotropic agent, and 50 to 70 weight percent of solvent and the total percentage of all components is 100 percent. The welding paste is suitable for various welding processes, is high in welding speed, does not damage components, does not contain halogen and does not have corrosiveness, and residues are few after welding.