298results about How to "Improve welding efficiency" patented technology

The invention provides a method for welding a specially-thick high-strength bridge steel plate and belongs to the technical field of specially-thick plate welding. The test plate of the method adopts a symmetric narrow gap U-shaped groove form, is combinedly welded by using two efficient welding methods, namely gas shielded welding for priming and bottom filling, and double-wire submerged arc welding for continuous filling and finishing, so as to achieve the purposes of reducing filling level and giving full play to the efficient double-wire submerged arc welding and high automation degree. The method has strong operability, greatly improves the welding efficiency of the specially-thick bridge steel plate, and significantly reduces manpower cost. Furthermore, by selecting a proper welding sequence, the method solves the problem that the welding deformation of the specially-thick steel plate is hard to control.

The invention discloses a full-automatic laser welding device for battery production. A clamping jig arranged on a rack is provided with a clip, a first locating device, a second locating device and a gland, wherein the clip is used for fixedly installing a battery and the first locating device and the second locating device are arranged on a PCB. A product feeding device can place the clip on the first locating device. A feeding device on the PCB can place the PCB on the second locating device. Laser beams of the laser welding device can just be projected on the welding spot needed to be welded of the battery and the PCB. An unloading device can place the welded products on a designated location. A controller controls the actions of the product feeding device, the feeding device on the PCB, the clamping jig, the laser welding device and the unloading device. The full-automatic laser welding device realizes full-automatic feeding, welding and detection of nickel and aluminum sheets of the positive and negative electrodes of a cell phone battery, is fast in welding speed and good in quality, avoids the damage to the battery and the PCB, and can ensure that all the welded batteries are qualified products through scanning of battery bar codes by a bar-code scanner before welding.

The invention relates to a submerged-arc welding process of a large-size cylinder body, comprising the following steps of: firstly laying a standard operation platform at a construction field, erecting a submerged-arc welding bracket and installing an electric rotator on the standard operation platform, and arranging an automatic welding operation platform on the submerged-arc welding bracket; then horizontally placing the cylinder body to be welded on the electric rotator, wherein the electric rotator drives the cylinder body to rotate during rotation; installing a travelable submerged-arc welding trolley at the lower part of an inner ring welding line when the inner ring welding line is welded, wherein the traveling speed of the submerged-arc welding trolley is equal to the rotating speed of the electric rotator, and the submerged-arc welding trolley and the electric rotator are inversed in motion directions so that the submerged-arc welding trolley is positioned on the welding line position of a starting point of the lower part of the cylinder body all the time; and placing the submerged-arc welding trolley on the automatic welding operation platform when an outer ring welding line is welded, wherein the electric rotator drives the cylinder body to rotate, and the submerged-arc welding trolley is in a static state. The invention realizes the purpose of automatic welding through the rotation of the cylinder body and the coordination of the submerged-arc welding trolley, greatly reduces the labor intensity of welders, also enhances the welding efficiency and the welding quality and has very high practical value.

The invention discloses a laser-MAG (Metal-Active-Gas) compound welding method used for welding and splicing high-strength or ultrahigh-strength steel of a thick plate. The method aims at high-strength or ultrahigh-strength steel thick plates and utilizes a laser-MAG compound heat source to carry out single-side single-channel, single-layer and double-face molding welding; a welding part is an I-shaped groove; laser or oxyacetylene torch is adopted to pre-heat a work-piece before welding; and the temperature is kept for 20 min to 1 hour after the welding. The welding technical parameters are that the spot diameter of the laser is 0.3-1 mm, the laser power is 4-10 KW, the arc current is 200-300 A, and the arc voltage is 25.2-30 V. By improving the form of the groove of the work-piece and reserving an assembling distance and optimized welding parameters during the splicing, the splicing and welding of the ultrahigh-strength steel plate is realized; the welded joint performance is satisfied with and better than that of regular TIG (Tungsten-Inert-Gas) welding, the welding speed can be up to 60 m/h; and the welding efficiency is improved by 10 times than the regular TIG welding.

The invention provides a circuit board assembly method which comprises the following steps: conducting a surface mount process, namely setting a program for a SMT (Surface Mount Technology) machine according to an XY coordinate file of a PCB (Printed Circuit Board), printing tin paste on the PCB by a SMT tin paste template (namely a steel mesh), putting SMT components onto the machine, and performing the surface mount process on the SMT components to obtain a surface mount plate; inserting, namely inserting DIP (Double In-line Package) components into a jig, and inserting the surface mount plate into the jig and the DIP components of the jig to obtain a circuit board to be soldered; soldering, namely performing reflow soldering on the jig and the circuit board to be welded. Due to the adoption of the scheme, an existing wave soldering process of the through-hole DIP components is changed to a reflow soldering process, so that the assembly manpower is saved, the SMT and DIP component soldering efficiency is improved, and the product reject ratio in an automated production process is reduced; the circuit board assembly method has very high market application values.

The invention provides an ultrahigh-intensity all-austenite stainless steel welding wire, and relates to a stainless steel welding wire. The welding wire comprises the following chemical ingredients in percentage by mass: 0.05 to 0.3 percent of C, 0.50 to 1.20 percent of Si, 10 to 15.0 percent of Mn, 16.0 to 20.0 percent of Cr, 3.0 to 7.0 percent of Ni, 0.01 to 0.03 percent of Ti, 0.1 to 0.30 percent of N, 0.15 to 0.30 percent of V, at most 0.010 percent of S, at most 0.020 percent of P and the balance Fe. The ultrahigh-intensity all-austenite stainless steel welding wire is applicable to all-position welding, the welding quality is good, meanwhile, the welding efficiency is also greatly improved, multi-time performance tests prove that when the welding wire is adopted for welding Mn13 steel, the welding seam metal intensity reaches higher than 730 MPa, the toughs reaches about 100J, the performance index requirement is met, in addition, the preheating-free welding is realized, the heat treatment is not needed after the welding, and the welding process is simplified. Compared with a traditional welding wire with the same alloy content, the welding wire provided by the invention ahs the advantages that the intensity of melted metal is improved by 150MPa, in addition, the low-temperature impact is improved by 20J, the result shows that the weld metal integral performance of the welding wire is excellent, in addition, the cost is lower, and higher cost performance is realized.

The invention relates to a welding method for insertion nozzle and cylinder non-rectangular intersection connector, characterized in that saddle automatic submerged arc welding machine or deep and narrow groove welding torch is used; the groove shape is I-type, namely the angle of groove at two sides is O; the nozzle is set vertically and the cylinder is oblique; auxiliary tooling is used; the welding method from the lower part to middle part to upper part is adopted to achieve purposes of automatic submerged arc welding and control deformation. The merit of invention is that the influence of human factor to welding quality is decreased; the welding efficiency is improved greatly and the machining period is shortened; welding material can be saved notably; welding quality can be guaranteed in effect; and the machining cost is decreased greatly.

The invention discloses a method for fusion-welding iron-aluminum inter-metallic compounds and steel through pulses. The invention adopts Cr25Ni13Mo2Nb austenite steel welding wires as filling materials and inertia gas protection. The invention takes argon tungsten pulsed arc welding to weld the iron-aluminum inter-metallic compounds and carbon steel or stainless steel. The diameter of the austenite steel welding wires is 1.6-3.0 mm, the inertia gas protection is argon, the processing parameters of the argon tungsten pulsed arc welding are that base current is 70A-180A, pulse current is 100A-250A, pulse duration is 0.15s-0.60s, welding voltage is 12V-18V, argon flow is 10L/min-16L/min, the argon flow of back protecting gas is 2L/min-5L/min, and distance between a jet of a welding torch and a component is 6mm-12mm. The invention can weld the iron-aluminum inter-metallic compounds and the dissimilar materials of the steel to obtain welding connectors with non-cracks and non brittle phases under the condition of non-heating. The invention has the advantages of strong applicability, convenient operation, the invention is convenient for popularization and application, the invention is in particular suitable for welding the iron-aluminum inter-metallic compounds and the carbon steel or the stainless steel, and applied to weld the iron-aluminum inter-metallic compounds and other low-alloy structural steel and heat resistant steel.

The invention discloses a welding working platform for a carriage of a garbage truck and belongs to the technical field of manufacturing the carriage of the garbage truck. The invention aims at solving the problem of providing a special device which has simple structure and can realize fast and accurate positioning assembly welding when assembling the large tank of an after-loading compression-typed garbage truck. The technical scheme adopted by the invention is that a fixed frame platform is fixed on the ground; the front side and the back side at the left end of the fixed frame platform are provided with a location bracket and a changeable location block; a swing frame platform is articulated with the changeable location block by a rotating shaft; the fixed end of a swing air cylinder is articulated with the location brackets; the telescopic end of the swing air cylinder is articulated with the swing frame platform by a pin shaft; a bottom board location seat is arranged in the middle position of the fixed frame platform; a side plate location seat is fixed at the lower part of the swing frame platform; a top plate location seat is fixed at the upper part of the swing frame platform; a hydraulic controller is fixed at the middle position of the right side of the fixed frame platform; the hydraulic controller is connected with the swing air cylinder by an oil pipe. The welding working platform of the invention can be broadly applied to the field of welding the carriage of various garbage trucks.

The invention relates to an automatic welding machine which comprises a base station, a clamp device, a first ball screw, a first servo motor, a first welding gun component and a second welding gun component. The clamp device is mounted on the base station, the first ball screw is penetratingly mounted in the clamp device and connected with the first servo motor which is fixedly mounted on the base station, the first servo motor drives the first ball screw to drive the clamp device to be in linear motion on the base station, the first welding gun component and the second welding gun component are positioned on two sides of the clamp device respectively, a first cylinder drives a first welding gun rack to adjust position of a first welding gun, and a second cylinder drives a second welding gun rack to adjust position of a second welding gun. The automatic welding machine has the advantages that welding needs on oil storage cylinders and dustproof covers of dampers diverse in structure can be met; the automatic welding machine can replace manual welding, so that welding efficiency is improved; the automatic welding machine can replace welding of a manipulator, so that welding quality is guaranteed while welding cost is lowered.

The embodiment of the invention discloses a control system for a lockhole effect TIG deep penetration welding welder. The control system comprises a main control circuit module, a man-machine interface, a welding power source control module, a control switch module, a high-frequency arcing module, a current balance module, a double-circuit drive module and a double-circuit IGBT module. The invention further discloses a control method adopting the control system for the lockhole effect TIG deep penetration welding welder. By the adoption of the control system and the control method, a specially-designed welding gun is driven and controlled to achieve lockhole effect deep penetration argon arc welding, and welding efficiency is greatly improved; and meanwhile beveling is not needed in the thick plate welding process, and no filler wire is needed or only a small number of filler wires are needed, so that welding cost is greatly reduced, and high industrial application value is achieved.

The invention provides a welding control method and device. The method includes the steps that a weld joint is scanned, the image characteristic points of the weld joint are extracted, and the image characteristic points of the weld joint comprise a characteristic point of a weld groove in the weld joint and a characteristic point of the trajectory of the weld joint; according to the image characteristic points of the weld joint, the three-dimensional configuration of the weld joint is constructed; and on the constructed three-dimensional configuration, corresponding welding process parameters are calculated along the trajectory of the weld joint at the interval of a preset step size and are output so that the welding control can be performed according to the calculated welding process parameters, and the preset step size is smaller than the length of the weld joint. Due to the application of the above scheme, the welding quality and the welding efficiency generated when the weld joint is long and the change of the weld groove is not uniform can be improved.

The invention relates to the technical field of welding equipment, particularly to a double-end automatic straight seam welding machine. The straight seam welding machine comprises a machine seat provided with a linear guide sliding table, a variable frequency motor,a cross frame and a positioning seat; the variable frequency motor is driven to be connected with the sliding table through a transmission mechanism, and the two ends of the cross frame extend to two sides of the machine seat and provided with welding devices respectively; and a material pressing cylinder and a material pressing plate are arranged on the outer side of the positioning seat, and an output end of the material pressing cylinder is connected with the material pressing plate. According to the straight seam welding machine, the material pressing cylinder is adopted to perform pneumatic positioning and material pressing clamping, clamping positioning is rapid, convenient and accurate, the left and right welding devices are equipped with a set of welding guns respectively, servo driving is performed through the variable frequency motor, the sliding table, the cross frame and the welding devices are controlled to move longitudinally for welding, the programmable logic controller (PLC) is used for controlling dimensions of welding seams and arc starting and suppression actions, double-end straight seam welding can be performed automatically, the welding efficiency is high, the quality of the welding seams is high, and the straight seam welding machine can be applied to mass produced products with straight welding seams.

The invention provides a welding method of an aluminum target assembly. The welding method comprises the steps that an aluminum target and an aluminum back plate are provided; a brazing filler metal wetting layer is formed on the surface, to be welded, of the aluminum target or the surface, to be welded, of the aluminum back plate; the aluminum back plate and the aluminum target with the formed brazing filler metal wetting layer are placed in a vacuum packaging sleeve, and the surface, to be welded, of the aluminum back plate makes contact with the brazing filler metal wetting layer, or, the aluminum target and the aluminum back plate with the formed brazing filler metal wetting layer are placed in the vacuum packaging sleeve, and the surface, to be welded, of the aluminum target makes contact with the brazing filler metal wetting layer; the aluminum target, the brazing filler metal wetting layer and the aluminum back plate are welded together through a hot isostatic pressing technology so as to form the aluminum target assembly; after welding is accomplished, the vacuum packaging sleeve is cooled and removed to obtain the aluminum target assembly. By means of the welding method, welding between the aluminum target and the aluminum back plate can be achieved, the welding efficiency is high, the formed aluminum target assembly is high in welding strength and low in deformation, and the demand of long-term stable production and usage of targets can be met.

The invention provides a welding method of a tungsten titanium target module. The welding method comprises the following steps: a tungsten titanium target, a copper back plate and a middle layer are provided; the tungsten titanium target, the middle layer and the copper back plate are positioned in a vacuum ladle, and the surfaces to be welded of the middle layer and the tungsten titanium target are bonded with the surface to be welded of the copper back plate; the tungsten titanium target, the middle layer and the copper back plate are welded to form the tungsten titanium target module by using a hot isostatic pressing process; and after the welding is finished, the vacuum ladle is cooled, and the vacuum ladle is removed to obtain the tungsten titanium target module. The welding method can realize welding between the tungsten titanium target and the copper back plate, and is higher in welding efficiency; and the formed tungsten titanium target module is higher in welding strength and low in deformation to satisfy the demands of long-time stable target production and use.

The invention provides an automatic welding connector device, comprising a work table, a first transmission assembly, a second transmission assembly and a welding assembly, wherein the first transmission assembly comprises two brackets, a rotary shaft connected to the two brackets, a transmission track connected to the rotary shaft and at least one vehicle slidably connected to the transmission track; the welding assembly comprises a rack arranged on the work table, a second servo motor arranged on the top end of the rack, a welding joint connected to the second servo motor and a connector welding block arranged on the rack; and the second transmission assembly comprises a first sliding cylinder arranged on the work table, a connector sliding block slidably connected to the first sliding cylinder, a first translation cylinder arranged on the bottom end of the first sliding cylinder and a second sliding cylinder connected to the connector welding block. The automatic welding connector device can implement the welding operation automatically and carry out a plurality of welding operations simultaneously, so that the welding efficiency is increased greatly, and the welding precision is higher.

The invention provides a blade welding clamp for an impeller assembly. The blade welding clamp can solve the problems of poor blade positioning precision, welding difficulty and low welding efficiency in the welding process of the blade and the impeller assembly shell in the past. The blade welding clamp comprises a clamp bottom plate, and a positioning core rod is fixed on the clamp bottom plate. The blade welding clamp is characterized in that: three blade positioning and clamping structures are arranged on the clamp bottom plate, and the three blade positioning and clamping structures are uniformly arranged on the clamp bottom plate in the rotating direction of a blade.

The invention provides a heat source system which comprises a heating system and a heat distribution system, wherein the heating system comprises a gas supply unit and a temperature control unit; the gas supply unit is used for supplying flow gas; the temperature control unit comprises a base plate, and a plurality of through holes are formed in the base plate so as to allow the flow gas to pass; a temperature regulation device is arranged aiming at least a part of the plurality of the through holes, and can regulate the temperature of the flow gas passing the corresponding through holes independently; and the heat distribution system comprises a partition device which divides the heat distribution system into a plurality of areas, so that the flow gas passing the plurality of through holes reaches to-be-heated objects in the plurality of areas. The heat source provided by the embodiment of the invention can provide non-uniform heating as required.

The invention discloses a welding method of a polyethylene (PE) gas valve. A first end pipe assembly, a second end pipe assembly, a valve upper seat assembly, and a valve body assembly conical surface corresponding end are welded at the same time. Mechanical limiting is adopted for fit hot melting of a hot mold conical surface and an assembly welding face to limit the linear movement distance of the hot melting. Compared with the prior art, the welding method of the PE gas valve has the advantages that three ends of the gas valve are welded at the same time, and welding efficiency is greatly improved; and the mechanical limiting is adopted to accurately control thickness of a welding layer in a welding process, quality of welding joints of the welded valve is guaranteed, size of the welded valve is controlled, and installation consistency of a matched bleeder is effectively guaranteed.

The invention discloses a circular seam welder for automobile wheels. The circular seam welder comprises a welder body, a workbench arranged in the welder body, a rotatable workpiece clamping device arranged on the workbench and at least two welding guns, wherein the welding guns are uniformly arranged on the workbench around workpieces. Because the at least two welding guns are arranged, the welding efficiency is greatly improved. In addition, due to the introduction of a workpiece compacting and swelling component, the deformation of the wheels in the welding process is also greatly reduced, and the welding effect is also remarkably improved.

The invention relates to the technical field of material welding and discloses a laser welding method for a reactor core wrapping tube. The method includes the following steps: machining I-shaped grooves at 8 portions to be welded on a workpiece of the reactor core wrapping tube, installing the workpiece on an inner supporting tool to form the reactor core wrapping tube with I-shaped welding gaps formed at the 8 portions to be welded of the workpiece, installing the inner supporting tool and an outer supporting tool on the reactor core wrapping tube, conducting manual argon arc welding and spot welding to fix the reactor core wrapping tube, conducting laser spot welding on the outer portions of the I-shaped welding gaps in a subsection mode, transversely arranging the reactor core wrapping tube on an idler wheel shelf, adjusting the I-shaped welding gaps to be welded, conducting laser welding on the I-shaped welding gaps to be welded on the reactor core wrapping tube, conducting welding penetration in the one-time welding in the welding process, rotating the reactor core wrapping tube and repeating the last step till the I-shaped welding gaps are all welded. By means of the method, a laser welder molds the welding gaps with thickness as 16mm in a one-time welding penetration mode, and welding efficiency is greatly improved. Due to the fact that the laser welding is small in deformation and even in welding, size accuracy of the welded workpiece is improved, and yield is improved.

The invention discloses a vertical weld tracking system and method capable of adaptively adjusting the inclination angle of a welding gun. The system mainly comprises a current sensor, a welding gun swinging and inclination angle adjuster, a welding gun inclination angle and current coordinative processor, a weld tracking processor, a crossed sliding frame, a welding trolley and assembly connection circuits, wherein the welding gun swinging and inclination angle adjuster is mounted on the welded crossed sliding frame; the current sensor is used for detecting a welding current signal; and under the combined control of the two processors, a vertical weld can be tracked, and the inclination angle of the welding gun can be adaptively adjusted. According to the vertical weld tracking system, processing of the welding current signal is converted into adaptive adjustment of the inclination angle of the welding gun, so that on the premise of guaranteeing the weld tracking precision, the shortcoming of a poor weld form of general pneumatic-electric vertical welding is overcome. Parameters can be adjusted conveniently and quickly, and the automation degree is increased.

The invention discloses a diaphragm seal weld joint welding machine for a heat exchanger and a welding method. The welding machine comprises a rack arranged at the end of a pipe box, an annular guide rail arranged on the rack and a welding device. Guide rail teeth are arranged on the annular guide rail. The welding device comprises a welding gun frame, a welding gun arranged on the welding gun frame, a wire feeding device and a guide rail gear arranged on the welding gun frame and matched with the guide rail teeth. Under the driving action of a power source, the welding gun rotates along the annular guide rail. Compared with the prior art, the welding efficiency of the welding machine is high, welding and sealing quality consistency is good, weld joints are uniform, the structure is simple, disassembly and assembly are convenient, and meanwhile the assembly quality of the end and an end cover of the pipe box can be improved. The welding method includes the steps that the welding machine is fastened to a threaded hole in the end of the pipe box through a stud nut of the pipe box of the heat exchanger, or the welding machine is fastened to the outer circle face of the end of the pipe box through a tightening bolt. The welding method is simple and easy to operate, can improve assembly and welding quality and is convenient to industrially popularize on a large scale.

The invention relates to the technical field of laser welding, in particular to a continuous pipe laser welding device. The continuous pipe laser welding device comprises a machine base platform, straightening conveying mechanisms, a continuous pipe fixing and clamping mechanism, a continuous pipe adjusting and clamping mechanism, an all-position welding ring rail mechanism and a laser head. The two straightening conveying mechanisms are arranged above the machine base platform. The continuous pipe fixing and clamping mechanism and the continuous pipe adjusting and clamping mechanism are fixedto the machine base platform, and the continuous pipe fixing and clamping mechanism and the continuous pipe adjusting and clamping mechanism are arranged between the two straightening conveying mechanisms. The all-position welding ring rail mechanism is fixed to the machine base platform, and the all-position welding ring rail mechanism is arranged between the continuous pipe fixing and clampingmechanism and the continuous pipe adjusting and clamping mechanism. The laser head is connected to the all-position welding ring rail mechanism. According to the continuous pipe laser welding device,the laser head can move in the circumferential direction on the all-position welding ring rail mechanism, and welds a weld seam of a continuous pipe at multiple angles, and the welding efficiency andwelding quality are improved.

The invention discloses a hydraulic support welding system and method. The hydraulic support welding system comprises at least one welding workstation, positioners, a logistics trolley, guide rails and a control system. Each welding workstation comprises two welding robots. The guide rails comprise the main guide rail and the auxiliary guide rails perpendicular to the main guide rail, the welding workstations are sequentially arrayed along the main guide rail, and the auxiliary guide rails are arranged between the positioners and the welding workstations. The welding workstations are provided with laser tracking sensors. The two welding robots of each welding workstation, the positioners and the logics trolley are connected with the control system. When the welding system and method are used for performing assembly welding on connecting rods, the model of the connecting rods is automatically recognized, so that the uniformity of welded joints is good.

The invention relates to a solder strip pulling device and method, and the device comprises a bottom plate, a first wire rail, and a first solder strip pulling apparatus. The first solder strip pulling apparatus and the first wire rail are respectively disposed on the bottom plate. The rear side of the first solder strip pulling apparatus is provided with a second solder strip pulling apparatus, and a guide solder strip apparatus is disposed between the first solder strip pulling apparatus and the second solder strip pulling apparatus. The first solder strip pulling apparatus comprises a first moving mechanism and a solder strip pressing mechanism, wherein the solder strip pressing mechanism can achieve the compression of a solder strip. The first moving mechanism can enable the solder strip pressing mechanism to move back and forth along the first wire rail, and is used for pulling the solder strip clamped by the solder strip pressing mechanism to a set position, or conveying the solder strip pressing mechanism to a solder strip grabbing position. The second solder strip pulling apparatus comprises a second moving mechanism and a clamping jaw mechanism, wherein the clamping jaw mechanism can achieve the clamping of the solder strip. The second moving mechanism can enable the clamping jaw mechanism to move back and forth along the first wire rail, and is used for conveying the clamping jaw mechanism to the position of the solder strip pressing mechanism and conveying the solder strip clamped by the solder strip pressing mechanism to the set position. The device is ingenious and reasonable in structure, is simple in structure, and can improve the pulling efficiency of the solder strip.

The invention relates to a method of laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel and belongs to the field of welding. The invention aims to solvethe technical problem that by adopting a welding method for low nickel nitrogen-containing austenitic stainless steel at present, the pore probability in a welded joint is relatively high and the stability is relatively poor. The method comprises the following steps of I, arranging a to-be-welded steel plate as a welded joint and processing a V-shaped groove; II, arranging hybrid welding protective gas as mixed gas of nitrogen and argon; and III, performing laser and MIG electric arc hybrid welding synchronously. By welding the low nickel nitrogen-containing austenitic stainless steel by adopting a laser-MIG electric arc hybrid welding process, the welding efficiency is high, the low nickel nitrogen-containing austenitic stainless steel is formed well, and the heat affected zone is small.In addition, compared with other protective gas mixing forms, laser-MIG electric arc hybrid welding of low nickel nitrogen-containing austenitic stainless steel adopting the protective gas of 98% Ar+2%N2is obvious in advantage: the pore probability in the welded joint is small, the welding penetration is large, the electric arc stability is good, the hardness distribution trend is gentle and a quench hardening tendency is avoided.

An argon arc welding back shielding gas device for a vertical welding seam comprises a guide rod and a clamping structure connected with the guide rod. A flexible sealing strip is fixed to the guide rod, and a connection head is installed on the bottom of the guide rod. The clamping structure comprises a pressing rod, a connection rod connected to the pressing rod in a pivoted mode and a torsion spring installed between the connection rod and the pressing rod. The pressing rod is connected with a handle in a pivoted mode. The connection rod comprises a base and a rectangular block arranged on the base. A square groove for an insertion piece to be inserted is formed in the side surface of the rectangular block, and a stud locking the insertion piece is arranged on the side surface of the rectangular block. The rectangular block is provided with an auxiliary handle, a supporting arm of the auxiliary handle is installed on the rectangular block, and the other supporting arm of the auxiliary handle is installed on the handle in a suspension mode and is clamped to or loosened from the handle to control lifting and pressing of the pressing rod. According to the argon arc welding back shielding gas device, one side welding and double side forming can be achieved, the polishing and sealing process on the back side can be eliminated, the welding efficiency of semi-automatic argon arc welding is improved, the labor intensity of operating personnel is lowered, and the engineering cost is lowered.

The invention provides a power transmission and transformation frame A pillar pairing and welding device. The power transmission and transformation frame A pillar pairing and welding device comprises sliding rails, and a pillar top component positioning mechanism and a bottom flange positioning mechanism which are mounted on the sliding rails and can move along the sliding rails, wherein the pillar top component positioning mechanism comprises a top flange positioning component, a baffle and a mounting platform; the baffle is arranged on the mounting platform; a mounting groove is formed in the baffle; the top flange positioning component comprises a top flange mounting plate for fixing a top flange workpiece and a base; the top flange mounting plate is rotatably arranged on the base; the base is mounted on the mounting platform and can longitudinally move relative to the baffle so as to assemble the top flange workpiece into the mounting groove; the bottom flange positioning mechanism comprises mounting bases and bottom flange positioning plates for fixing bottom flange workpieces; the bottom flange positioning plates are rotatably arranged on the mounting bases; the bottom flange positioning plates are matched with the baffle and are used for clamping the two ends of an A pillar workpiece. The power transmission and transformation frame A pillar pairing and welding device effectively simplifies the welding steps and improves the assembling efficiency.

The invention provides a printed circuit board device manufacture method. The method comprises the steps that a PCB hard board is acquired; a solder paste printer is used to coat solder paste on the pad of the PCB hard board; whether the solder paste coated on the pad by the solder paste printer is qualified is detected; a corresponding electronic component is surface-mounted on the qualified pad detected by an SPI solder paste detector; welding operation is carried out on the electronic component on the corresponding pad; defect detection is carried out on the PCB hard board on which the electronic component is welded; an automatic glue sprayer is used to glue and cover the welding area of the electronic component and the pad on the PCB hard board whose defect detection is qualified; high temperature curing is carried out on the glued and covered PCB hard board; an FPC soft board is acquired, and a soft and hard board assembly fixture is used to assemble the PCB hard board after high temperature curing and the FPC soft board; and the PCB hard board and the FPC soft board on the soft and hard board assembly fixture are welded to form a printed circuit board device.