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

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 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 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.