175results about How to "Avoid Weld Cracking" patented technology

The invention relates to an overlaying welding technology of an iron casting, in particular to an overlaying welding technology of a ductile cast iron roller. The technology comprises the following steps: (1), post-welding preparation: a, detecting cracks; b, controlling a welding material; and c, selecting a welding beveling; (2), welding: a, preheating the beveling within a range of 120mm to 180mm at a temperature range of 130 DEG C to 170 DEG C; b, adopting a DC reverse-connected arc welding machine for welding, using welding rods with the diameter of 3.2mm for welding a first-layer welding line and using welding rods with the diameter of 4mm for welding lines on subsequent layers; and (3), post-welding detection. The invention adopting the technologies, such as small currents, a plurality of stages, sectional welding, welding line hammering after welding, cooling speed reduction, and the like prevents welding line cracks and fusion region cracks from generating, prolongs the service life of products, obtains favorable economic benefits and solves the problems for the overlaying welding of mid-small cracks, and the like on the surface of the ductile cast iron roller.

The invention provides an operating method for welding a fillet weld of a tube seat on an HRSG P91 header, which solves the problems in the traditional welding method of SA-335P91 material adopted on a boiler header. The operating method featured by bottom layer welding for the fillet weld of the tube seat on the header, intermediate layer welding for the fillet weld of the tube seat, facing layer welding for the fillet weld of the tube seat and multilayer and multichannel welding with no oscillation as much as possible is adopted, and an annealing weld bead is formed during facing. Heat input can be reduced appropriately so that the primary qualified rate of supersonic flaw detecting reaches over 99%, inward recessing, crack and other defects of a bottom layer are effectively prevented, and the flat and eye-pleasing metal surface of a weld seam is maintained.

The invention provides an electric welding rod with ultra low hydrogen and high toughness. The electric welding rod comprises core welding-wires and electrode coating composition. The electrode coating composition comprises the following components (weight percentage): 38-42 percent of marble, 21-28 percent of fluorspar, 1-3 percent of white titanium pigment, 6-10 percent of ferrotitanium, 0.5-1.5 percent of low-carbon ferromanganese, 3-7 percent of ferrosilicon, 3-6 percent of manganese metal, 2-4 percent of metallic chromium, 1-3 percent of mica, 1-3 percent of ferromolybdenum, 1.5-3.5 percent of ferrovanadium, 1-4 percent of nickel powder and 2-4 percent of rare earth metal. H08A is adopted as the core welding-wires, and water glass is used as the cementing agent. The electric welding rod fills the blank of electric welding rod needed for an ultra-thin large diameter circular saw blade, and simultaneously the electric welding rod can also be used for the welding of products in structures of carbon tool steel, alloy tool steel and spring steel material. The electric welding rod has good welding processing property and crack resistance, and simultaneously has very high welding strength, rigidity, plasticity and toughness, and the color of the welding seam is identical with the color of the base material.

The composite rotary double focus laser-MIG electric arc welding head includes mainly two parts, the rotary double focus laser welding head and the MIG electric arc welding wire feeding welding gun, connected via a connecting plate. It has welding wire feeder fixed on the connecting plate, welding wire feeding hose connected to the feeder, conducting nozzle and goose neck for welding wire to pass through; protecting nozzle in the end of the goose neck; and rotating table with reflecting cavity, regulating frame, reflector, connecting barrel and welding laser head. The present invention combines the rotary double focus laser welding and the MIG electric arc welding, and has greatly raised welding performance and lowered assembling precision requirement for even wide application.

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.

The invention discloses a spiral molded large-deformation-resistant submerged-arc welding pipe and a manufacture method thereof. A large-deformation-resistant hot rolled coil plate is unrolled and straightened, a welding groove is respectively machined on two sides of the plate, then the plate is placed into a spiral steel pipe molding unit to be molded and bent into a pipe shape gradually, the submerged-arc welding process is adopted to conduct welding pipe welding, and the welding pipe is subjected to following treatment such as hole enlargement, detection, hydraulic test and ultrasonic detection to form a product. The submerged-arc welding pipe has low yield ratio, larger even elongation, high deformation hardening exponent and Round-House type stress-strain curve under the premise that the welding pipe meets the requirement for high strength and high flexibility. The welding pipe is mainly applied to regions such as frozen earth zones, landslide zones, earthquake zones and the like where geological movement happens easily, serves as a steel pipe in oil and gas delivery pipes which can bear large deformation and stress, and ensures safe service of the pipes.

The invention discloses a production process of a laminated-rolled wide sheet. The production process specifically comprises the following steps that (1) a blank is selected, the selected blank is bloomed to 70-75 mm, and then a bloomed sheet is subjected to flame cutting and sizing; (2) milling is carried out on the blank sheet subjected to primary sizing; (3) a groove is formed in the surface ofa lower blank, an isolating agent is sprayed in the groove, and the isolating agent is dried; (4) aligning and compounding are carried out on the dried lower blank and upper blank, and welding is carried out; (5) a blank boss is machined; (6) the blank sheet is placed in a stepping type heating furnace for heating; (7) descaling is carried out with high-pressure water; (8) broadening rolling is carried out by a 5000 mm rolling mill; (9) straightening is carried out; and (10) plasma cutting and sheet separating are carried out. According to the production process of the laminated-rolled wide sheet, limitation on a roll gap of a 5m rolling mill in producing wide sheets with the thickness of 6 mm or below by using the CVC technology can be solved, and meanwhile, the problems that a wide sheet with the thickness of 8 mm or below is high in curvature and large in plate projection degree are solved.

A welding method for a vertically spliced super-thick steel plate is a welding method for a super-thick steel plate with the thickness ranging from 60mm to 120mm. The method is characterized by including: hoisting a primarily spliced super-thick steel plate onto a special jig frame for horizontal welding, fixing the super-thick steel plate with a waler of the jig frame by welding prior to fastening the super-thick steel plate with a ground abutting floor stand by the aid of a wedge, then using carbon dioxide arc welding for sequential symmetry horizontal welding on the front side and the back side of the super-thick steel plate respectively by even welders until spliced plate welding is finished, and finally performing postheat treatment to prevent cracks. The method has the advantages that welding deformation of the spliced super-thick steel plate can be well controlled, welding deformation correction is avoided, welding cracks are prevented, welding quality is improved, and construction requirements are met. The carbon arc air gouging process for back gouging is omitted, welding procedure is simplified, turnover times of the super-thick steel plate are decreased, workload is reduced, labor intensity is relieved, and production efficiency is improved.

The invention provides a non-preheating gas protection welding method for an EH36 high-strength steel thick plate. The non-preheating gas protection welding method comprises the following steps that aV-shaped welding slope is machined at the welding place of the EH36 high-strength steel thick plate, assembling is conducted on a welding plate by a clamping stacking, the clamping stacking is assembled on the back face side of the V-shaped welding slope, and a ceramic liner is arranged on the back face side of the V-shaped welding slope; and a run-on plate and a run-off plate are respectively welded to the two ends of the V-shaped welding slope through a semi-automatic CO2 gas protection welding manner, a flux cored wire with the diameter of 1.2mm is selected to conduct welding on the welding plate, the inter-channel temperature maintains below 230 DEG C in the welding process, and after each welding seam welding is finished, the slag cleaning work is conducted. By means of the non-preheating gas protection welding method, the generation of the welding cracks can be effectively avoided so that the welding quality is ensured, meanwhile, the input of pre-welding preheating equipment, energy, labor and the like is reduced, the production costs are reduced, and the production cycle is shortened.

The invention discloses a process for manufacturing a spoke plate of a wheel type construction machinery vehicle and a special vertical winding machine therefor, and belongs to the technical field of construction machinery. The process comprises the following working procedures: heating, wherein strips are heated to be between 650 and 750 DEG C to form heating strips; winding, wherein the heating strips are fed into the vertical winding machine and the strips are wound into vertical spiral blanks; cutting, wherein the spiral blanks are cut into separate blanks according to the specification of a prefabricated spoke plate; pressing spots, wherein cuts of the separate blanks are aligned for spot welding; welding, wherein the separate blanks after the spot welding are welded to form a spoke plate blank; finishing, wherein the dimensional precision of the welded blank is finished to form the spoke plate blank; and machining, wherein the spoke plate blank is machined to manufacture a spoke plate finished product. The invention is suitable for manufacturing the spoke plate of the wheel type construction machinery vehicle.

The invention provides a superlow-hydrogen, high-strength and high-toughness alloy tool steel welding electrode with outstanding anticracking performance, which comprises a core wire and a welding electrode covering composition, wherein the electrode covering composition comprises the following components in percentage by weight: 35 to 45 percent of marble, 20 to 30 percent of fluorite, 2 to 4 percent of titanium white, 8 to 13 percent of ferrotitanium, 0.5 to 1.5 percent of alkali, 3 to 6 percent of metal chromium, 4 to 8 percent of metal manganese, 4 to 8 percent of nickel powder, 3 to 6 percent of ferromolybdenum, 2 to 6 percent of rare earth silicon, 2 to 6 percent of quartz and 2 to 6 percent of feldspar. The core wire is made of H08A steel or H08E steel, and potassium sodium mixed water glass is used as a bonder. The alloy tool steel welding electrode can be used as a superlarge-section alloy tool steel (5CrNiMo) structure welding electrode which used to lack and can be used for welding other high-strength alloy steel structure products. The welding electrode has an excellent welding process property, high welding strength, rigidity, plasticity and ductility.

The invention discloses a dissimilar metal welding method of titanium alloy and austenitic stainless steel, comprising the following steps of: carrying out grinding and assembling before welding; and carrying out welding by using a method of filler wire pulsed TIG welding. With the dissimilar metal welding method of the titanium alloy and the austenitic stainless steel of the invention, by welding parameter adjustment, preheating before the welding, thermal insulation and slow cooling after the welding and control of melting and solidification conditions of a titanium alloy and stainless steel welding pool, a welding joint which has nice weld formation, and has no defects of cracks and air holes is obtained. The welding method of the invention has high welding efficiency, low cost, convenient and flexible operation, and can meet requirement of the welding joint of welding the dissimilar metals of the titanium alloy and the austenitic stainless steel.

The invention relates to a heat exchanger for distillation. The technical scheme is that: the heat exchanger consists of a shell pass and a tube pass, wherein in the shell pass, an upper cylinder body of the shell pass and a lower cylinder body of the shell pass are connected into one body by an expansion joint, both ends of the shell pass are connected with an upper tube plate and a lower tube plate, a heat exchange tube and a central tube pass a baffle plate, both ends of the heat exchange tube and the central tube are connected with the upper tube plate and the lower tube plate, the central tube is arranged on the axis of the upper tube plate and the lower tube plate, a baffle plate is fixed by a distance tube, a lower cylinder of the shell pass is provided with an exhaust and a steam outlet of the shell pass, an upper cylinder of the shell pass is provided with a steam exhaust and a steam inlet of the shell and a shock proof plate is arranged in the upper cylinder body of the shell pass; and in the tube pass, both ends of a lower tube pass cylinder body are connected with a lower tube pass flat cover and the lower tube plate by flanges, and the lower tube pass is provided with a tube pass exhaust and a material charge port; both ends of an upper tube pass cylinder body are connected with an upper flat cover and the upper tube plate by flanges, and the upper tube pass is provided with a material discharge port and a fixed gas discharge port; and the pads are arranged between the upper tube pass flanges and the upper tube plate and between the lower tube pass flanges and the lower tube plate. The heat exchanger is high in gasification rate and good in heat exchange effect.

The present invention relates to steel rail welding and is especially the welding process of steel rail for portal crane. The welding process includes selecting welding rod for high carbon manganese steel rail; regulating the assembly interval between two rails to 15-25 mm, fixing with arched fixture and backing with copper cushion; welding single side of the copper cushion via manual arc welding and right-angle bevel butt welding. The welding process has preheating temperature not lower than 300 deg.c, interlayer temperature not lower than 200 deg.c and after-welding heating temperature not lower than 600 deg.c with the temperature being measured in the point away from the welding seam center by 100 mm. All the welding seams are inspected via magnetic powder flaw detection for welding crack and other flaws.

The invention discloses a welding wire special for 7XXX series aluminum alloy and a manufacturing method thereof. The special welding wire is composed of, by mass, 2.0%-6.0% of Ni, 0-5.0% of Mg, 0.1%-0.3% of Zr, 0.1%-0.3% of Ti, 0.1%-0.3% of Cr, 0-0.1% of Fe, 0-0.1% of Si, and the balance Al. The manufacturing steps comprise burdening, smelting, sampling analysis, semicontinuous casting, homogenizing heat treatment, extruding, wire drawing, surface treatment, cleaning, drying and packaging. According to the welding wire, the element Ni which can be subjected to the eutectic reaction with the Al is selected, so that the hot tearing tendency of welds is reduced by forming eutectic structures. The welding wire is suitable for all 7XXX series aluminum alloy and is mainly specific to welding of the high-strength 7XXX series aluminum alloy with poor welding performance. By adopting the welding wire for fusion welding of the 7XXX series aluminum alloy, welding cracks can be effectively avoided, and the weldability of the high-strength 7XXX series aluminum alloy is improved. Through proper heat treatment of welding joints, the strength of the welds is not lower than 260 MPa, and elongation is not lower than 3%.

The invention belongs to the technical field of ferrite stainless steel steel-strip connecting, and particularly discloses a welding method for connecting ferrite stainless steel steel-strip with a thickness of 3-6 mm. The welding method comprises the following steps: shearing two steel strip heads to be welded, pressing a steel strip, and enabling the two steel strip heads to align to form a seam with a trapezoidal cross section; filling nickel-based welding material into the welding seam, and using a welding wire with the diameter of 1.2mm to weld along one end of the welding seam; and carrying out stress-relief annealing on the welding seam after the welding is completed. The welding method adopts a laser welding process to connect the ferrite stainless steel steel-strip, the welding seam is flat, free of the defects of welding pores, welding flash and the like, degree of welding seam heat effect on structure grain coarsening degree is controlled to be lower than level 2, annealing treatment is carried out on the welding seam, welding residual stress on the welding seam is eliminated, and joint mechanical properties of the welding seam is improved.

The invention discloses an aluminum alloy piece welding method. The aluminum alloy piece welding method comprises the following steps that firstly, bottoming welding is conducted on a welding line of aluminum alloy base metal through an ER5356 welding stick in a TIG welding manner, and a bottoming welding flux layer is formed on the welding line of the aluminum alloy base metal; secondly, filling welding is conducted on the bottoming welding flux layer through an ER4043 welding stick in a TIG welding manner, and a filling welding flux layer is formed on the bottoming welding flux layer; and thirdly, capping welding is conducted on the filling welding flux layer through an ER5356 welding stick in a TIG welding manner. According to the aluminum alloy piece welding method, the filling welding flux layer is formed in the manner that the ER4043 welding stick is welded to the bottoming welding flux layer with the ER5356 welding stick, the characteristic that the tenacity of the welding flux layer formed through welding of the ER4043 welding stick is good is utilized, the tenacity of the whole welding line is improved, the problem that welding cracks occur in the position of the welding line after the aluminum alloy base metal is cooled is avoided, and accordingly the pass percent of a welded finished product of the aluminum alloy base metal is increased.

The invention belongs to the technical field of AP1000 nuclear power, and particularly relates to an AP1000 main steam pipeline welding method. In order to solve the problems that an air filling protection device is difficult to install and potential safety hazards exist in the good health of operators when a conventional air filling protection device is used for auxiliary welding of an AP1000 main steam pipeline, the AP1000 main steam pipeline welding method is disclosed. The welding method particularly includes the following several steps of S1, chamfering; S2, welding assembly; S3, weld preheating; S4, welded connection; and S5, postweld heat treatment. When the welding method is used for welding the AP1000 main steam pipeline, through adjustment matching of the groove dimensions and welding parameters, welded joints formed in the welding process can still achieve a continuous and uniform forming effect without the supporting action of backing gas, and therefore installation of the air filling protection device is omitted and the influence on the good health of the operators by protective gas is avoided.

The invention belongs to the technical field of welding, and relates to an argon arc welding method suitable for a TiAl-based alloy and a titanium alloy material. The method comprises the following steps of: (1) selecting a titanium alloy welding wire of TA0-1 or TC4 or the same brand as a welded titanium alloy base material as a welding filling material; (2) performing pre-welding thermal treatment on the TiAl-based alloy to be welded, wherein the thermal treatment temperature is 1,310 to 1,350 DEG C; (3) preheating a test piece to be welded or a part to be welded in an argon filled box by adopting an induction coil, and measuring the temperature of the welded TiAl-based alloy at the position within 20 millimeters far from a seam, wherein the preheating temperature is between 500 and 800 DEG C; (4) performing argon tungsten-arc welding in the argon filled box; and (5) performing annealing thermal treatment on the welded piece after welding, wherein the full stress removal annealing temperature of the welded titanium alloy is selected as the thermal treatment temperature. The room temperature tensile strength of an obtained joint is 400 to 490MPa, and achieves 80 to 95 percent of that of the TiAl base material.

The invention discloses a technique for preventing defects of a surfacing wear-resistant layer of a part. By the technique, the surfacing quality of parts such as pistons is improved, the number of rework is reduced, the one-step delivery-check qualified rate of the parts is improved, and the production cost is reduced. According to the technical scheme, the technique comprises the following steps of (1) roughly turning outlines of a piston part to obtain a part with a cylindrical boss structure and forming an annular groove with the inverted-isosceles-trapezoid-shaped section in a cambered surface of a large end of the part; (2) surfacing a nickel-base superalloy auxiliary layer in the annular groove, performing crossing symmetrical welding, transversely welding the annular groove along the axial direction, sequentially welding the annular groove until surfacing on the whole annular groove of the part is finished and machining the auxiliary layer; (3) surfacing an aluminum bronze layer on the auxiliary layer and performing crossing symmetric welding; and (4) sequentially performing destressing treatment and finish machining on the piston part after the piston part is subjected to surfacing so as to obtain a finished product of a piston.

The invention discloses a high-manganese high-chromium self-shielded welding wire and a production technique thereof. The high-manganese high-chromium self-shielded welding wire comprises a steel strip and an alloy powder core, wherein the steel strip is wrapped on the alloy powder core. The alloy powder core comprises the following components in percentage by mass: 0-0.2% of C, 6-20% of Cr, 10-20% of Mn, 0-5% of Ni, 0-2% of Si, 0-3% of Mo and 0-3% of V. The high-chromium high-manganese self-shielded welding wire disclosed by the invention has the advantages of high welding efficiency and favorable cracking resistance, can be used for overlay welding of different alloy mother metals, and can be used as a precoating or transitional material for welding dissimilar steel. Meanwhile, the alloy has favorable working hardenability, can be designed as a surface strengthening material, and has shock resistance and wear resistance.

The invention provides a non-preheating submerged-arc welding method of an EH36 high strength steel thick plate. The non-preheating submerged-arc welding method includes the following steps of processing an X-shaped welding groove in the welding point of the EH36 high strength steel thick plate; completing positioned welding at the X-shaped welding groove through semi-automatic CO2 gas shielded welding; welding a starting weld tab and a run-off tab at both ends of the X-shaped welding groove through the method of semi-automatic CO2 gas shielded welding correspondingly; and selecting solderingflux and a welding wire with the diameter being 5mm to weld a welding plate at the positioned weld joint. The interpass temperature is kept at 230 DEG C or below in the welding process and slag removal work is carried out after each weld joint is welded; and the groove root is cleaned after welding filling of a front groove is completed through carbon arc air gouging matched with mechanical grinding,and then the back weld joint is filled filling. According to the non-preheating submerged-arc welding method of the EH36 high strength steel thick plate, generation of a welding crackcan beeffectively avoided to ensurethe quality of the weld joints. At the same time, input of preheating equipment, energy, labor and the like before weldingis reduced, the production cost is reduced, and a production cycle is shortened.

The invention discloses a one-site automatic welding device and welding method for large pipelines. The automatic welding device comprises a welding supporting frame, wherein two horizontal supportingplates are placed on one side of the welding supporting frame, flush electric pushing rods are installed at the two ends of the top surfaces of the two horizontal supporting plates correspondingly, the four flush electric pushing rods are installed at the four corners of the bottom surface of a flush supporting frame correspondingly, material supporting rods are installed in the two ends of the top surface of the flush supporting frame in an embedded mode, supporting rolling wheels are installed at the bottom ends of the material supporting rods, the bottom surfaces of the supporting rollingwheels make contact with the top surface of the flush supporting frame, lead screw installing grooves are formed in the middles of the top surfaces of the material supporting rods, rotating motors areinstalled in the middles of one ends of the material supporting rods, friction wheels are movably installed at the top ends of sliding frames, and a movable supporting plate is installed at one end of the outer side of the fixing supporting frame in an embedded mode. Through the cooperative use of the flush electric pushing rods, an inclined rolling wheel frame, a welding positioner and a corresponding electric pushing rod, the center lines of the two pipelines are located on the same straight line conveniently, the pipelines can be adjusted and supported, and the working efficiency is improved.

The invention relates to a method for testing the performance of a high strength steel fillet welding joint. The method comprises the following steps: 1), test plates of a T-shaped fillet weld are in butt joint with each other, and a single V-shaped groove is formed in the position of the fillet welding joint; 2), the surface of the groove is cleaned up through mechanical treatment before welding; 3), Ar plus CO2 mixed gas shielded arc welding or CO2 gas shielded arc welding is adopted; 4), multi-layer and multi-pass welding is carried out by utilizing solid welding wires, and the welding proceeds without interruption; 5), curved samples are cut off, the lateral surfaces of the samples are leveled through mechanical workout and are bent at an angle of 120 DEG; and 6), the fillet welding areas of the bent samples are subjected to macroscopic or microscopic detection. Compared with the conventional method for detecting the welding joint, the invention can achieve the effects of reliably testing the suitable groove angle of a high strength steel fillet welding joint with the tensile strength of 600-800 MPa, the matching level of welding wires and the crack resistance of the welding joint, avoiding unnecessary multi-layer and multi-pass welding, and greatly reducing the welding cost. The invention has the characteristics of simple operation and superior applicability, and facilitates popularization and application as well as improvement of the production efficiency.

The invention provides a repair welding method of an austenite stainless steel casted nuclear pump shell. The repair welding method comprises the specific steps of defect detection and treatment; welding slot treatment; welding rod treatment: baking a welding rod at the temperature of 150 DEG C, and keeping the temperature for standby application; preheating of a to-be-welded zone; repair welding of the to-be-welded zone: carrying out repair welding layer by layer and pass by pass; confirmation of the repair welding effect: carrying out flaw detection on a repair welding zone of a pump body through rays, confirming the repair welding effect, and guaranteeing that the repair welding zone does not have weld defects; and solution treatment: carrying out solution treatment on workpieces subjected to repair welding. According to the repair welding method, samples do not have relatively large welding deformation through adoption of symmetrical arc-shaped welding slots, pre-welding preheating and postwelding thermal treatment; stress after repair welding is reasonably distributed through requirements on shape and radian of the welding slots and pre-welding thermal treatment; the content of impurity elements can be controlled and weld joints do not have obvious defects through surface roughness control and cleaning for the welding slots, and baking treatment for the welding rod; and intergranular corrosion resistance of austenite of the repair welding zone of a nuclear pump can be improved through postwelding solution treatment for a corresponding zone of the nuclear pump body.

The invention discloses a welding method of maritime work high-strength steel plates. An asymmetric X-shaped or K-shaped groove is formed in the welded position. A gap of 2+ / -1 mm is reserved in the root portion of the groove. When the asymmetric X-shaped groove is adopted, the angle of the groove is 40+ / -5 degrees, and CO2 protects multi-layer and multi-pass welding of flux-cored wires. When the K-shaped groove is adopted, the angle of the groove is 45+ / -5 degrees, and CO2 protects multi-layer and multi-pass welding of flux-cored wires. Besides, the welding thickness on the two sides is set in the mode that the plate thickness is D mm, the distances between the section, parallel to the plane of each steel plate, of the root portion of the groove and the two planes of the steel plate are T1 and T2, the groove portion on the T1 side is shallow, the groove portion on the T2 side is deep, T1 is smaller than T2, T1 is equal to 1 / 2D-3 mm, and T2 is equal to 1 / 2D+3mm. By the adoption of the welding method, the welding workload can be lightened, heat energy dissipation is reduced, unexpected welding deformation and welding cracks of welded components are avoided, the welding stress is rapidly eliminated, and a welded structure meets expected requirements.

The invention discloses a thick plate laser arc composite double-sided synchronous horizontal welding method and device. The horizontal welding method comprises the following steps that 1, a welding workpiece is prepared; 2, two laser arc devices are arranged on the two sides of the welding workpiece correspondingly, and the positions are adjusted; 3, welding process parameters are set, a laser arc device is started, and a base layer is welded; and 4, welding process parameters are adjusted, a laser arc device is started, and filling layer welding is performed. The method reduces the porosity of the weld joint, solves the problems of incomplete penetration of the weld joint, incomplete fusion of the side wall, weld joint cracks and the like, and ensures the quality of the weld joint and the welding stability. The horizontal welding device comprises a TIG welding gun, a first laser device, a second laser device, a GMAW welding gun and an air injection assembly.

The invention discloses a reinforced high-pressure GIS (gas insulated switchgear) shell. The reinforced high-pressure GIS shell comprises a barrel and flanges at two ends of the barrel. An inner seam allowance is arranged on the end face of one side of an inner hole of each flange; an inner groove is arranged in the orifice of an inner hole at each of two ends of the barrel; the inner seam allowances sleeve the barrel at intervals and are fixedly connected with the same by welding; the depth L1 of each female end is 0.9-1 times of the wall thickness of the barrel; the upper end face of each inner seam allowance is provided with a chamfer 45 degrees to 55 degrees in angle alpha, and the depth L2 of the chamfer is 0.4-0.5 times of the wall thickness of the barrel; the lower end face of each inner seam allowance is provided with another chamfer 35 degrees to 40 degrees in angle beta, and the depth L3 of the chamfer is 0.5-0.7 times of the wall thickness of the barrel; the length L4 of the truncated edge of each inner groove is 0.2 to times of the wall thickness of the barrel; further, gaps are reserved between the end face of the barrel and the lower end faces of the inner seam allowances. The reinforced high-pressure GIS shell is convenient to clean before welding, small in welding stress and welding deformation and small in allowance of secondary machining of the flanges.

The invention discloses a steel tube welding system and technology. The side wall of a preheating installation groove of a grinding and preheating assembly is fixedly connected with a detection motor.An output shaft of the detection motor is fixedly connected with a rotating column located in the preheating installation groove. The upper end of the rotating column provided with a sliding space isprovided with an opening, and a pressing column is arranged in the rotating column. The bottom end of the pressing column is fixedly connected with the bottom wall of the sliding space through a reset spring. The bottom wall of the sliding space is fixedly connected with a contact type pressure sensor. The two sides of the pressing column are fixedly connected with positioning columns. The positioning columns slide in sliding grooves formed on the pressing column. The bottom end of a steel wire plate is fixedly connected with a convex block. The side wall of the preheating installation grooveis fixedly connected with a single-chip microcomputer controller and an indicator light. The single-chip microcomputer controller receives the signal of the contact pressure sensor, and controls thedetection motor and indicator light to act.

The invention discloses a processing method for a roller sleeve of a roller press, which comprises the following steps: forging, first time heat treatment, first time machining, second time heat treatment, second time machining and the like. According to the invention, the method effectively avoids welding cracks caused by build-up welding, and has the characteristics of good wearing resistance, long service life, ensured rolling efficiency and effect, simple structure, easiness in processing and fabrication, low cost, convenience in replacement and the like.