1233results about How to "Simple welding process" patented technology

This invention provides methods of treatment for work products of materials such as steel, bronze, plastic, etc. and particularly welded steel bodies by pulse impact energy, preferably ultrasonic, to relax fatigue and aging and extend expectant life. The treatment may occur (a) at original production, (b) during the active life period for maintenance or (c) after failure in a repair stage. The ultrasonic treatment improves the work product strength. In welded products residual stress patterns near the weld sites are relaxed and micro-stress defects such as voids and unusual grain boundaries are reduced. The basic method steps are non-destructive in nature, inducing interior pulse compression waves with ultrasonic transducers and accessory tools impacting an external product surface with enough impulse energy to heat and temporarily plasticize the metal interior and relax stresses. The nature of the work product interior structure being treated is determined by sensing the mechanical movement at the impact surface of the work body to produce feedback frequency and phase signals responsive to input impact signals. These signals automatically conform driving pulse energy frequency and phase to the input transducers to match the mechanical resonance frequency of the working transducers and increase efficiency of energy transfer. Such feedback signals also are available for automated procedures which can improve product quality and consistency.

The invention discloses a cutting-stirring friction welding composite processing device for a floating double-shaft-shoulder double-stirring needle and a manufacture method thereof, and particularly relates to a combined or composite processing device capable of simultaneously carrying out milling or cutting processing and stirring friction welding processing and a method thereof. The cutting-stirring friction welding composite processing device for the floating double-shaft-shoulder double-stirring needle integrates a cutting system or a milling system, a stirring friction welding system, a forced cooling system, a gas protection system, a temperature sensing system, a pressure induction system, a milling liquid supply system and a sensing-free system. The cutting-stirring friction welding composite processing device has functions of temperature control, gas protection, pressure detection, cooling liquid protection, milling head replacing and floating double-shaft-shoulder self-supporting stirring friction welding. The method for carrying out cutting-stirring friction welding composite processing on workpieces can meet strength requirements of mechanical processing of ferrous light metal materials, carbon steel materials and alloy steel materials. The cutting-stirring friction welding composite processing device for a floating double-shaft-shoulder double-stirring needle and the manufacture method of the cutting-stirring friction welding composite processing device reduce manufacture procedures, save processing cost, have the advantages of being high in efficiency, excellent in quality, high in stability and saving in energy, break through limitation of conventional machining technology, form a new method and a new thought for machinery processing, and have wide application prospects in industries of heating, air conditioners, ice manufacture, freshness keeping, medicine preparation, construction, aquatic products and foods.

The invention discloses an excellent 100 kg-grade quenched and tempered steel plate with strong toughness and plasticity, and a manufacturing method thereof. The excellent 100 kg-grade quenched and tempered steel plate with strong toughness and plasticity comprises: by weight, 0.09 to 0.15% of C, less than or equal to 0.10% of Si, 0.70 to 1.10% of Mn, less than or equal to 0.013% of P, less than or equal to 0.0030% of S, 0.20 to 0.45% of Cu, 1.30 to 2.00% of Ni, 0.45 to 0.85% of Cr, 0.45 to 0.75% of Mo, 0.045 to 0.070% of Als, 0.008 to 0.025% of Nb, 0.030 to 0.060% of V, 0.004 to 0.010% of Ti, less than or equal to 0.0060% of N, 0.001 to 0.005% of Ca, 0.0006 to 0.0014% of B, and the balance Fe and unavoidable impurities. Through a technology (RQ+RQ+T) combining optimally controlled rolling and offline special conditioning, the excellent 100 kg-grade quenched and tempered steel plate with strong toughness and plasticity forms a microstructure composed of a fine tempered lower bainite and a tempered martensite, wherein an average size of druses is below 20 micrometers; tensile strength is great than or equal to 980MPa; yield strength is great than or equal to 890MPa; and single transverse Charpy impact energy (-60 DEG C) is great than or equal to 47J. Therefore, the excellent 100 kg-grade quenched and tempered steel plate with strong toughness and plasticity has excellent weldability and can solve the problem of over-quenching of a surface of a steel plate with ultra-high strength.

Prior to welding together two overlapped plated steel sheets 4 and 5 by laser lap welding that irradiates parts of the plated steel sheets (4, 5) extending on a weld line (Lw), slits (4b) are formed intermittently in the upper plated steel sheet (4) with a laser beam (L). Subsequently, a welding head (1) is moved along the weld line (Lw) while the upper plated steel sheet (4) is pressed against the lower plated steel sheet (5) by pressure rollers. Parts of the upper plated steel sheet (4) extending on the weld line (Lw) and not provided with the slits (4b) are irradiated with the laser beam to laser-weld the plated steel sheets (4, 5) together. A vapor of the component of the coating layers coating the joining surfaces (4a, 5a) of the plated steel sheets (4, 5) produced from the coating layers by the heat produced by the laser beam is discharged through the slits (4b). After thus laser-welding together the plated steel sheets (4, 5), the slits (4b) of the upper plated steel sheet (4) are stopped with a molten metal produced by melting a filler with the laser beam.

An electric arc welder for depositing weld metal along a groove between two edges of a metal workpiece where the welder comprises a first electrode driven by a first wire feeder toward a point in said groove, a second electrode driven by a second wire feeder toward the point and a main power source with a first output terminal connected to the first electrode and a second output terminal connected both to the second electrode and directly or indirectly to the metal workpiece to create a second electrode path and a workpiece path. The power source includes a high speed switching output stage for creating current with a selected AC waveform between the first and second output terminals where the waveform of the main power source is generated by a waveform generator controlling a pulse width modulator circuit to determine the current operation of the output stage.

A MIG welder and method of controlling a MIG welder which includes a wire speed selector that is used to generate a control signal which controls both the wire feed speed of a consumable electrode and the output current level of the power supply.

The invention discloses a method for welding composited tube at the bonding interface of carbon steel/stainless steel machinery, comprising the following steps: 1. welding groove treatment as follows:removing a section of stainless steel lined tube; processing the interior of the carbon steel parent tube exposed outside after removing the stainless steel lined tube into an inclined plane inclinedinwards from exterior to interior; using a tungsten electrode argon arc welding machine to carry out bead weld on the inclined plane from interior to exterior and forming multiple stainless steel bead weld layers; processing the weld surface of the carbon steel parent tube into a V-shaped groove; 2. backing weld: when fitting up the stainless steel bead weld layers before backing weld, adopting the tungsten electrode argon arc welding machine to carry out fitting-up and fixing in a manner of spot welding; 3. transition weld; and 4. carbon steel parent tube weld. The invention features simpleprocedure steps, less used weld materials, high weld pass percentage, good welding line mechanical property, high weld quality and improved production efficiency simultaneously.

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.

A design of a copper welding electrode is disclosed. The electrode can be used in successive spot welding operations on assembled aluminum alloy sheet parts of widely varying thicknesses, e.g., from 0.9 to 4⁺ mm. The electrode has a round body terminating in a truncated cone with a crowned face. The face has a diameter of about eleven millimeters up to the diameter of the body and the radius of the crowned face is about twenty to thirty five millimeters. The dimensions and shape of the electrode provide robust welding performances despite varying part thicknesses and off angle electrode positioning, and the textured surface provides good electrical contact.

The invention discloses a super-thick quenched-tempered steel plate with 60kg-grade tensile strength and a production method of the super-thick quenched-tempered steel plate. The production method includes the means as follows: adopting a component system of low C-Mn-(Ti plus Nb plus V plus B) micro-alloy steel as base, appropriately improving the content of acid solution Als which is greater than or equal to (Mn equivalent/C) * (Ntotal minus 0.0292Ti); controlling (Mn equivalent)/C to be greater than or equal to 15, alloying (Cu plus Ni plus Mo plus Cr); controlling Ni equivalent to be greater than or equal to 0.90%, Mo equivalent to be greater than or equal to 0.25%, and Nb/Ti to be between 1.0 and 2.5; conducting Ca treatment, and controlling the ratio of Ca/S to be between 0.80 and 3.00, (Ca)*(S)0.18 to be less than or equal to 2.5*10 minus 3, and F*DI index to be greater than or equal to 0.65* thickness of a finished steel plate. Optimization control rolling plus an off-line special quenching-tempering technology enable the microstructural of the finished steel plate to be tiny tempering bainite plus tempered martensite, the average colony size is below 25 Mum, excellent matching of strong toughness/strong plasticity is obtained and the mechanical property along the direction of the thickness of the plate is uniform; the super-thick quenched-tempered steel plate with 60kg-grade tensile strength is specially applicable to large-sized steel structures and equipment such as water-electricity penstocks, volutes, ocean platforms, large-sized engineering machinery and can realize low-cost industrial production in stable batches.

The invention discloses a high-alkalinity high-tenacity low-hydrogen agglomerated flux, which comprises the following components by weight: 18-21.5% of MgO, 33-35% of CaF2, 15-20% of Al2O3, 17-21% of SiO2, 3.5-8% of CaO, 1-5% of MnO, 2-5% of BaCO3, and less than or equal to 3% of FeO, wherein the total weight of the components is 100%. The invention further discloses a preparation method of the high-alkalinity high-tenacity low-hydrogen agglomerated flux, which comprises the steps of: mixing the raw materials and performing dry agitation, adding sodium silicate that accounts for 20wt% of the mixed powder, performing wet agitation, sending the materials to a pelletizer to pelletize, entering into a drying furnace after being dried by hot wind, drying at 180-230 DEG C, screening after discharge and then entering into a sintering furnace, sintering in the sintering furnace at 830-860 DEG C and discharging, and finally, screening and cooling to obtain the high-alkalinity high-tenacity low-hydrogen agglomerated flux. The flux provided by the invention solves the problems that a current flux is poor in toughness of weld metal and high in diffusible hydrogen content in deposited metal.

The invention provides low welding crack sensitivity steel with tensile strength at a 700MPa level and a production method thereof. The steel comprises the following two or more chemical components inpercentage by weight: C: 0.08-0.12, Si: 0.15-0.40, Mn: 1.00-2.00, P: smaller than or equal to 0.015, S: smaller than or equal to 0.006, Ni: 0.25-0.55, Mo: 0.15-0.28, V: 0.02-0.10, Cu: 0.18-0.30, Cr:0.15-0.30, Ti: 0.008-0.020 and B: 0.0007-0.0027 as well as the balance of Fe and inevitable impurities and also satisfies that Pcm is smaller than or equal to 0.24 percent and satisfies an equation: Pcm=C+Si/30+Mn/20+Cu/20+Cr/20+Ni/60+Mo/15+V/10+5B (percent). The invention adopts a deep molten iron desulphurization technology, a converter top and bottom converting, vacuum treatment and continuouscasting processes and carries out rolling and hardening, tempering and thermal treatment production according to a general clean steel process.

The invention discloses a 80Kg grade steel plate with ultrahigh toughness and extreme thickness and a manufacturing method of the steel plate. The steel plate comprises the following components in percentage by weight: 0.08-0.13% of C, Si smaller than or equal to 0.10%, 0.80-1.20% of Mn, P smaller than or equal to 0.013%, S smaller than or equal to 0.0030%, 0.20-0.45% of Cu, 1.00-1.60% of Ni, 0.35-0.65% of Cr, 0.30-0.60% of Mo, 0.040-0.070% of Als, 0.010-0.030% of Nb, 0.030-0.060% of V, 0.004-0.010% of Ti, N smaller than or equal to 0.0050%, 0.001-0.004% of Ca, 0.0008-0.0016% of B, and balance of Fe. According to the manufacturing method, a component system of low C-ultralow Si-medium Mn-(Ti+V+Nb+B) microalloyed steel is used as a basis, special rolling control and offline gradient tempering technology (QQ+T) are optimized, so that microstructures of the produced steel plate are small tempered bainite+ tempered martensite, the average crystal colony size is less than 20 microns, excellent obdurability and plasticity match is obtained, and mechanical performance in the direction of the thickness of the steel plate is uniform.

The invention discloses a method for girth welding for double-phase stainless steel bimetal composite tubes. The method comprises the following steps of: firstly, groove processing: the double-phase stainless steel bimetal composite tube consists of a double-phase stainless steel lining tube and a carbon steel base tube, the welding surface of the base tube is processed into a V-shaped groove at an angle of 45-55 degree, and the lining tube is 2-3 mm longer than the base tube; secondly, caulk welding: the connection ports between the base tube and the lining tube are welded through argon tungsten-arc welding, double-phase stainless steel welding wires are adopted, and the welding current is 65-80 A; thirdly, backing welding: the connection ports of lining tube are welded through argon tungsten-arc welding, double-phase stainless steel welding wires are adopted, and the welding current is 60-90 A; fourthly, base tube welding: the connection ports of the base tube are welded through arc welding, and double-phase stainless steel welding wires are adopted. The procedures and the steps are simple, the used welding material is in a small amount, the welding qualification rate is high, the welding defect can be reduced or avoided, and the production efficiency can be greatly improved.

The invention discloses a low-temperature steel flux cored wire. Flux core of the flux cored wire comprises the following raw materials by weight percentage: 28 to 33 percent of rutile, 1 to 3 percent of aedelforsite, 14 to 18 percent of silicon-manganese alloy, 16 to 21 percent of ferrous powder, 2 to 4 percent of nickel powder, 1 to 2 percent of cryolite, 5 to 7 percent of feldspar, 1.5 to 2.5 percent of ferrotitanium, 0.5 to 1 percent of ferroboron, 5 to 6 percent of mid-carbon ferromanganese, 2.5 to 4 percent of magnesite, 4 to 6 percent of quartz and 1.5 to 3.5 percent of fluorite. Compared with the similar product of the prior art, the flux cored wire belongs to the meta-acid slag series, and has the advantages of good electric arc stability, less splash, easy slag removal, good low-temperature impact ductility, good low-temperature crack resisting performance, high efficiency and low cost.

The invention relates to nickel-free high-toughness 80kg-grade high-strength steel and a manufacturing method thereof. A component system of ultralow C, ultralow Si, medium Mn and Ti, V and B microalloy steel is used as a basis; the acid-soluble Als content in steel is properly improved, the Als is not less than 10*[(%Ntotal)-0.292(%Ti)], Mn/C is not less than 12, (%C)*(%Si) is not more than 0.01, and [(%Cr)+1.3(%Mo)]*[(%V)+(%C)] is not less than 0.087; Ca treatment is carried out, the Ca/S ratio is 1.00-3.00, and (%Ca)*(%S)<0.18> is not more than 2.5*10<-3>; F*DI index number * zeta is not less than 2.0* finished steel plate thickness, wherein zeta is on-line DQ (direct quenching) hardenability contribution factor, and F is B element hardenability contribution factor; DQ (thermo mechanical control process: TMCP) and off-line tempering process (T) are optimized; the microscopic structure of the steel plate is fine low-carbon tempered martensite and tempered lower bainite; the steel has the average colony size below 20 mu m, has excellent strength and plasticity and strong toughness, and is particularly suitable for hydroelectric pressure water pipes, steel branch pipes, scrolls, ocean platforms, large-sized engineering machines and other large-sized steel structures and equipment.

The invention relates to a sintered flux for stainless steel surfacing with band electrode. One technical scheme of the sintered flux for stainless steel surfacing with band electrode includes that the sintered flux is formed by sintering the following components and the proportioned raw materials or materials, including 15-30 parts of CaF2, 20-50 parts of MgO, 1-10 parts of Al2O3, 15-30 parts of CaO, 25-50 parts of SiO2, and 1-5 parts of alloy powder. The another technical scheme includes that the sintered flux for stainless steel surfacing with band electrode comprises the following components and the proportioned raw materials or materials including 60-80 parts of CaF2,20-40 parts of Al2O3, 1-5 parts of CaO, 1-5 parts of SiO2, and 1-5 parts of alloy powder. The sintered flux has excellent performance and can meet the service requirements completely.

An HT 960 steel plate with excellent plasticity and toughness and a manufacture method thereof. The HT 960 steel plate comprises, by weight, 0.07%-0.12% of C, Si no mare than 0.15%, 0.80% -1.20% of Mn, P no mare than 0.012%, S no more than 0.0030%, 0.30%-0.60% of Cr, 0.30%-0.60% of Mo, 1.00%-1.60% of Ni, 0.15%-0.45% of Cu, 0.0008%-0.0016% of B, 0.006%-0.014% of Ti, 0.010%-0.030% of Nb, 0.025%-0.060% of Als, 0.030%-0.060% of V, N no more than 0.0060%, O no more than 0.0040%, 0.001%-0.004% of Ca, residual Fe and unavoidable inclusions. A TMCP + tempering thermal treatment process is employed to obtain super high strong steel plate with tensile strength no less than 960 MPa, yield strength no less than 900 MPa, Charpy transverse impact work (separate value) no less than 47J at -60 DEG C, fracture elongation percentage delta 5 no less than 15%, uniform elongation percentage Ag no less than 6% and excellent weldability.

A nitrogen alloyed welding wire with hard surface and alloy core for repairing on manufacturing rolling roller, mine machinery and large digger features that its core powder is prepared from alloy powder and mineral powder through mixing, and contains rutile, high-carbon ferrochromium, low-carbon ferrochromium, Si Al-Mg alloy, Mn, ferromolybdenum, ferrovanadium, ferrotictanium, Ni, chromium nitride and Fe. The nitrogen is used to replace part of carbon for alloying, so improving anticracking performance.