2074 results about "Submerged arc welding" patented technology

The automatic argon arc welding and narrow gas submerged arc welding process for circular pipe header seam features the first horizontal and vertical welding with immobile workpiece and using automatic cold welding TIG wire until completing over one third of circle; the subsequent welding in the other two thirds of circle with automatically rotating welding roller frame; and the performing in the identical site of the annular seam assembling and the welding. The welding apparatus for the said technological process consists of roller device and welding frame bogie, and the welding frame bogie on some tracks parallel to roller frame tracks is movable. The present invention has the advantages of automatic operation, raised welding quality, etc.

The invention belongs to the field of welding, in particular to a process method applicable to marine engineering large thick steel plate submerged arc welding in low-temperature environment, which comprises a welding method, welding material selection, a welding order, a welding process and the selection and control of various welding process parameters. The method renders with carbon dioxide gas protection welding, and fills and faces through an automatic submerged arc welding; stops welding when the welding reaches more than two thirds of the thickness of a large groove during the welding process, clears chips on the back side and completes the welding of the other side; finally completes the welding of the first side; strictly controls all relevant process parameters of the welding during the welding process, and solves the problems of poorer anti-crack toughness of welding seams and heat affected zones caused by too high cooling speed of the welding seams and too high temperature; can ensure good anti-crack toughness of a welding seam connector without heat treatment after welding; and can meet the requirements of welding of an E36 plate with the thickness of 35 to 77mm under the working environment at the temperature of above -30DEG C, simplifies the production process, shortens the production cycle and reduces the cost.

The invention discloses a girth welding technology for a vacuum container, which comprises the following steps: processing beveled edges, assembling and welding. In the step of processing the beveled edges, a 14mm thick 0Cr18Ni9 austenitic stainless steel material is selected as a cylinder base material, X-shaped beveled edges are adopted, an inside beveled edge is processed for 10mm with a single-side angle of 32.5 degrees, an outside beveled edge is processed for 4mm with a single-side angle of 35 degrees, and no truncated edge is left. In the step of assembling, reserved clearances of 2.0-2.5mm are assembled, argon tungsten-arc welding is adopted to position, a positioning welding length is 10-15mm, an interval is 200mm, and then a 'strut having a shape of Chinese character 'mi' which is used for adjusting the roundness of a cylinder is welded in the cylinder. In the step of welding, an argon arc welding double-gun butt-welding method is used for bottoming the interior of the cylinder, two layers are filled in an inner welding bead of the cylinder in the manner of manual arc welding, an external welding bead is covered in the manner of submerged-arc welding, and finally, the inner welding bead is covered in the manner of manual arc welding. The girth welding technology can be used for controlling the welding deformation and has the advantages that the method is simple and is easy to realize.

The self-protective high chromium cast iron cored build-up welding wire has metal powder core comprising nickel powder 6-8 wt%, middle carbon manganese iron 8-10 wt%, No. 45 ferrosilicon 9-12 wt%, high carbon ferrochromium 65-75 wt%, metal Cr powder 18-21 wt%, ferromolybdenum 5-7 wt% and Al-Mg powder 1.5-2.5 wt%, and with one welding wire filling amount of 0.49-0.53. The present invention makes it possible to use the welding wire in submerged arc welding without needing added flux and protecting gas, results in raised comprehensive welding performance and raised welding quality, and may be applied widely in build-up welding field requiring high antiwear, anticorrosive and anticracking performance.

The present invention relates to the high intensity pipeline steel burying arc solder. It solutes the question that because of the Cu's deposition, it leads to separate out Cu easily and ossify the steel in the smelting and the disposal of the heat and contains too many microelements so that it has disbennifits to the smelting technical control. The technical steps are that the weight percent of the chymic component is C 0.04~0.12,Si 0.005~0.10,Mn 1.20~2.00,Ni 0.10~0.60,Cr 0.10~0.60,Mo 0.10~0.50,Ti 0.04~0.15,B 0.002~0.012,P<=0.015,S<=0.01, and the allowance is Fe. The invention solders matchingly with the alkalescence sinter flux. The resist drawing intensity of the welding line is higher than 650MPa.The intensity of the welding line of the jointing X80 pipe line steel reaches 740MPa, and the -20 Deg. C concussion power is higher than 120J.Then the content of the welding line S and P is low and the degree of purity is high. It applies to the burying arc jointing of the X80 high intensity pipeline steel and the other corresponding intensity low levels' alloy which resisted drawing intensity is between 620 and 740MPa.

The invention relates to a submerged arc welding wire used on a pipeline steel, which is applied in the submerged arc welding of an X80 high steel grade pipeline steel plate used on high-pressure oil and high-pressure gas conveying pipelines. The chemical components comprise (according to weight percent): C 0.02-0.07; Si 0.10-0.30; Mn 1.80-2.50; P is less than 0.010; S is less than 0.010; Cr 0.10- 0.50; Ti 0.05-0.08; Mo 0.20-0.50; B 0.003-0.004; and the rest is Fe. The welding wire is matched with BGSJ101-G flux and other special flux for pipeline steel welding , and then the best strength and toughness of welding seam can be obtained; the tensile strength ob of welded seam metal is more than or equal to 700MPa. Impact energy AkV of the welded seam metal in the minus 20 DEG C is more than or equal to 150J. And thus, the invention is suitable for the submerged arc welding of the X80 high steel grade pipeline steel plate.

The invention relates to a butt joint submerged-arc welding method of bridge steel with tensile strength more than 690Mpa grade, overcoming the defects that at the present, bridge steel and other engineering structural steel which are in 690Mpa strength grade needs preheating before welding and heat treatment after welding and has severe welding environment and the like during manual and gas protective welding. The butt joint submerged-arc welding method comprises the following steps: adopting steel with tensile strength Rm of between 690Mpa and 745Mpa, the yield strength ReL of between 550 and 690Mpa, the extension rate A of between 19 percent and 21 percent, KV2 ballistic work of between 165J and 180J at 40 DEG C below zero and the thickness of 40mmm, and adopting same-thickness butting;adopting matched welding wires with the tensile strength more than 690Mpa and diameter phi of 4.0mm, and using CHF105 as a welding flux; adopting a double-sided X-type asymmetrical submerged-arc welding groove with the angle of 60 degrees and the truncated edge of 5mm; continuously welding until welding seams are full, and under the conditions that the welding current is 570A, the voltage is 31V,the speed is 35cm/min and the linear energy is 30kj/cm; baking the welding flux for 1 hour at 350DEG C and keeping the temperature of welding layers between 100 DEG C and 150DEG C.

The invention discloses a welding method for Q345qDNH weather-resisting steel for a bridge. According to the welding method provided by the invention, specific to the special chemical components, suitable technical conditions and different slab thickness of the Q345qDNH weather-resisting steel for the bridge, a welded joint is jointed in a butt-jointed or T-shaped corner jointed form. According to the welding method, submerged-arc welding, drug core CO2 gas shielding semi-automatic welding or shielded metal arc welding is adopted and the weld preheating temperature is confirmed according to the different slab thickness. According to the welding method provided by the invention, the joint form and the thickness size of a bridge structure are completely covered; the technical scheme is simple and the applicability is strong; the implementing effect meets the technical demands of the present related standard for the construction of the bridge steel and the bridge structure; and the welding method can be practically applied to the welding of the Q345qDNH weather-resisting steel bridge structure.

The invention provides a vacuum milling method for a metal compound plate, which relates to a compound plate production method and comprises the following steps that: 1, circumference lead angle beveled edges are processed on the circumference of the single side of a base plate, and the circumference dimension of a stainless steel plate is smaller than the dimension of the circumference lead angle beveled edges; 2, a right-angle hole is drilled between the lead angle beveled edges; 3, the stainless steel plate is flatly paved on the lead angle beveled edges side of the base plate, in addition, a soldering flux layer is flatly paved between the stainless steel plate and the base plate, and the circumference sealing welding is carried out on a pressure platform; 4, the vacuum pumping is carried out through the right-angle hole of the base plate, and the sealing and plugging is carried out after the vacuum pumping; 5, the two prepositive blank stainless steel surfaces are combined, in addition, a high-temperature adhesion-prevention agent layer is flatly paved between the two prepositive blank stainless steel surfaces, then, separation plates with the same circumference lengths are in dot welding on the circumference, and next, submerged arc welding sealing welding is carried out between the two lead angle beveled edges and the separation plates; 6, a plurality of vent holes are drilled on a sealing and welding ring frame and the separation plates, 7, the hot milling is carried out; and 8, the edge milling separation is carried out. The vacuum milling method has the advantages that the prepositive blank processing and the vacuum pumping are firstly carried out, then, air holes are drilled, excessive air can be exhausted during the milling, and the plate material quality is ensured.

A method for manufacturing double metal composite wear-resistant metallurgical rollers includes steps of roller core processing, preheating, surfacing of a composite layer, finish machining and thermal treatment. The roller core processing step includes subjecting steel good in tensile strength, yield strength and impact resistance to forging, pressing and tempering, manufacturing roller core blanks, subjecting the roller core blanks to rough machining to reserve size for a surfaced composite layer. The preheating step includes preheating the roller cores to the optimum surfacing temperature of 380 DEG C +/- 5 DEG C. The surfacing step of the composite layer includes surfacing and filling the reserved surfaced composite layer by flux-cored wires on the surface of the preheated roller cores by means of submerged-arc welding process. The finish machining step includes processing the surfaced double metal composite wear-resistant metallurgical roller blanks into design size. The thermal treatment step includes quenching and tempering the double metal composite wear-resistant metallurgical rollers subjected to finish machining, so that the surfaces of the double metal composite wear-resistant metallurgical rollers can meet the requirements for good anti-sticking abrasion, grain abrading resistance, red hardness, resistance to cold and hot fatigue, and peeling resistance.

The invention discloses a submerged arc welding method of plank boards and jointing boards, which is characterized in that through steps of reasonable welding material selection, strict pre-welding preparation, scientific pre-welding preheating, welding process and welding technology, the welding quality of submerged arc automatic welding of plank boards with the thickness of 25mm to 45mm is controlled. The pass rate of welding seams by shooting once reaches 100 percent, and welding distortion is controlled ideally. The mechanical property of a welding joint meets standard requirements, and ensures the quality of products.

The invention discloses a longitudinal seam red copper liner welding process of a steel sheet pressure vessel. The longitudinal seam red copper liner welding process sequentially comprises the steps of (a), aligning and splicing a longitudinal seam of a machined cylinder and carrying out point welding fixation; (b), placing the inner longitudinal seam of the machined cylinder on a red copper liner; (c), aligning the longitudinal seam of the machined cylinder to the center line of a welding groove of the red copper liner, fixing the machined cylinder and the red copper liner through an air cylinder, and guiding water into a cooling water pipe of the red copper liner; (d), carrying out welding; (e), disassembling the machined cylinder after the longitudinal seam of the machined cylinder is welded. The welding process has the advantages that automatic submerged arc welding of one-side welding and two-side forming is achieved, the RT flaw detection qualification rate is high, welding flux is saved, the manufacturing quality of the steel sheet pressure vessel is improved, and the production cost is lowered.

The invention discloses a stainless steel compound welding steel pipe and a manufacturing method thereof. The stainless steel compound welding steel pipe is formed by welding stainless steel compound hotly-rolled rolling plates through a welding line, wherein the welding line is formed by a stainless steel compound welding line and a carbon steel welding line. The manufacturing method comprises the following steps of: milling an edge and arranging a groove; when putting a stainless steel compound layer on the inner layer, firstly utilizing gas shield welding to weld a middle layer; then, utilizing a stainless steel welding strip to weld a stainless steel compound layer welding line in an argon arc welding manner; then, utilizing a carbon steel welding strip to weld the carbon steel welding line by a submerged-arc welding manner; when the stainless steel layer is less than 0.9 mm, directly welding a stainless steel welding line by submerged-arc welding; and when the stainless steel compound layer is located at the outer layer, firstly welding the carbon steel welding line by adopting the carbon steel welding strip and the submerged-arc welding, and adopting the stainless steel welding strip and the argon arc welding manner to weld the stainless steel compound layer welding line. According to the stainless steel compound welding steel pipe and the manufacturing method thereof, the manufactured stainless steel compound welding steel pipe has high structural strength and strong corrosion resistance; and the bonding strength of an inner pipe and an outer pipe is not less than 200 MPa.

The invention provides a method for welding Q500qE ultralow-carbon bainite steel for a bridge. The method is excellent in joint mechanical performance and high in welding efficiency and specifically includes that aiming at specific chemical components, applicable technical conditions and different plate thicknesses of the Q500qE ultralow-carbon bainite steel for the bridge, preheating temperature before welding, groove types and welding process parameters are determined; a welding joint type adopts butt joint, penetration angle joint or ship position T-shaped angle joint; a welding method adopts submerged arc welding, CO2 gas shielded semiautomatic welding or shielded metal arc welding. By the welding method, the joint type and thickness specifications of a bridge structure are comprehensively covered, the technical scheme is simple, convenient and high in adaptivity, all implementing effects meet technical requirements of standards related to building of bridge steel and the bridge structure, and the method is of great significance in promoting upgrading of the bridge steel and development of large-span steel bridge building technology. The method can be applied to building of the bridge structure, can also be applied to welding of other ultrathin-carbon bainite steel and is high in adaptivity.

The invention relates to the technical field of welding of H-shaped steel and particularly relates to a back-chipping-free full-penetration submerged-arc welding process method for welding H-shaped steel with a web plate more than 16mm thick. The process method comprises the steps of material selection, edge preparation, assemblage of the H-shaped steel, positioned welding, preparation before welding, welding and the like, wherein the assemblage is required to be zero assembling, and an assembling interval is less than or equal to 0.5mm; the angles of K-shaped symmetrical beveled edges are designed to be at 60+/-2 degrees, and the truncated edges of the beveled edges range from 1mm to 2mm; and the standard lengths of copper cushion blocks are designed to be 530mm and 130mm. The submerged-arc welding process method has the advantages of low cost, high efficiency, labor saving, reduction in environmental pollution and the like; and according to primary measurement and calculation, the welding process method can reduce the cost for welding the H-shaped steel with the web plate more than 16mm thick by 25%.

The invention discloses a technology for repairing surfacing of a piston rod of a super large marine diesel engine, and the technology can carry out the deep repair of the surface of the piston rod. The adopted surfacing process is as follows: flaw detection and straightening are carried out on the piston rod, turning machining is carried out on the surface of the piston rod to remove a defect layer, and individual deeper cracks are manually removed by grinding; fire whirl is used for heating the piston rod twice, the first heating is carried out till 200 DEG C-250 DEG C, the heating is stopped, the race rotation is carried out for 30 minutes, the second heating is further carried out after the temperature difference between the interior and the exterior is reduced, and a surfacing machine tool is rotated after reaching 250 DEG C-300 DEG C; submerged arc welding is used for rotating dual heads of the surfacing machine tool and a 2Cr13 flux-cored welding wire for carrying out the simultaneous surfacing, and asbestos cloth is used for wrapping and keeping the temperature during the welding process; the piston rod wrapped by the asbestos cloth for slow cooling after the surfacing achieves the size requirement, when the temperature is decreased to be lower than 100 DEG C, the piston rod wrapped by the asbestos cloth is vertically placed till the temperature is decreased to the room temperature, and then the temperature-keeping cloth is removed. The surface of the piston rod after the repair by employing the method has no weld defects, the piston rod fully meets the performance requirements, and the cost is only about one fifth of the cost for fabricating a new piston rod.

The invention relates to a welding technique, especially a combined welding process combining small bevel angle full-automatic CO2 gas shielded protection welding with unionmelt welding, comprising following steps: (1) opening a corresponding small angle bevel on the weldment with a bevel angle of 25+50DEG; (2) paring, ensuring welding space of 8+20mm; (3) grounding welding by using full-automatic CO2 gas shielded protection welding; (4) performing filling in and capping welding by using unionmelt welding. The advantages of the invention are: (1) small bevel angle welding, saving material and improving productivity; (2) grounding welding by using unionmelt welding, the electrical arc heat quantity is centralized, the heated area is small, the welding speed is quick, head affection range is contracted, and welding deformation is small; (3) crackle generation tendency is decreased; (4) bottom slag cleaning is avoided to prepare for narrow gap welding and welding efficiency is increased; (5) filling in and capping are performed by using unionmelt welding, so that welding speed and external appearance forming quality are assured.

The invention discloses a method for manufacturing X70 steel-level large deformation-resistant longitudinally submerged arc welding pipes, which is applied to the manufacture of special welding pipes for oil and gas transmission. In the method, a controllable rolled steel plate is used, wherein the controllable rolled steel plate has a ferrite-bainite double-phase metallurgical microstructure and contains the following chemical components: 0.04 to 0.07 percent of C, 1.60 to 1.85 percent of Mn, 0.15 to 0.30 percent of Si, not more than 0.003 percent of S, not more than 0.010 percent of P, 0.15 to 0.30 percent of Ni, not more than 0.020 percent of Ti, 0.015 to 0.040 percent of Al, 0.010 to 0.065 percent of Nb, not more than 0.006 percent of N, not more than 0.30 percent of Cu, 0.10 to 0.25 percent of Cr, and not more than 0.0005 percent of B. The method comprises the following steps: (1) milling edges of the steel plate; (2) pre-bending bended edges; (3) performing JCO forming; (4) pre-welding joint seams; and (5) performing finish-welding on the inner and the outer sides of the joint seams. The method is applied to the manufacture of large-deformation-resistant welding pipes which are used in seismic belts, frozen soil areas, landslide area and other areas with high risk of deformation. The method has the advantages as follows: in the JCO forming process, the local deformation amounts and straight edge sizes of the steel plate in different rolling passes are analytically acquired according to the width, thickness and strength of the steel plate and the size of a die so as to determine the rolling passes and ensure uniform deformation at all parts of the steel plate after forming; and in the diameter expansion process, the minimum diameter expansion amount is determined according to the size and shape of the formed steel pipe, so as to ensure the size, shape and physiochemical properties of the steel pipe after diameter expansion.

The invention relates to a super-thick steel plate welding method. According to the method, the fabrication weldability of super-thick steel can be effectively improved, and the construction efficiency and the weld inspection first-pass yield can be improved. The method comprises the following steps of 1, processing a welding groove; 2, preparing before welding; 3, preheating before welding; 4, welding. The method is simple; the improved design of the welding groove is reasonable and reliable, and the method is suitable for common domestic single wire submerged arc welding machines and is high in practicability; a combined welding process of taking super low hydrogen electrode arc welding as backing weld and adopting submerged arc welding for filling and cosmetic welding is adopted, and the welding advantages of the two processes are integrated; the fabrication weldability of the super-thick steel plate is greatly improved, the welding quality of the super-thick steel plate is controlled, the first-pass yield of super-thick steel plate butt weld inspection is improved, and the method can be widely applied to welding construction of low-alloy high-strength structural steel super-thick steel plates which are 60-300mm in thickness and has good technical, economic and social benefits.

The invention discloses a deposition forming manufacturing method of parts and molds, and belongs to the field of non-mold growing manufacturing and remanufacturing. The method comprises the following steps that S1, the three-dimensional CAD model of a workpiece to be formed is subjected to hierarchical slicing; S2, the CNC codes of all hierarchical slices are acquired; S3, deposition forming is conducted layer by layer according to the CNC codes of all the hierarchical slices, the fine portions of the workpiece are formed by laser, and one or more technologies in electric arc welding, electron beam welding, electroslag welding and submerged-arc welding is or are adopted to form the thick wall and the non-fine portions of the workpiece; or in the S3, a heat source which is compounded by laser beams and gas protection electric arcs or a heat source which is compounded by the laser beams and vacuum protection electronic beams is adopted for forming the thin wall and the fine portions of the workpiece, and the gas protection electric arcs or the vacuum protection electron beams are shut down. According to the deposition forming manufacturing method, direct deposition forming can be achieved to obtain parts and molds which are stable in structure property and high in manufacturing precision and are provided with thin walls or fine portions.