47 results about "Faying surface" patented technology

A method is provided for forming a large metallic component using a friction stir welded blank. A first and second metallic plate are positioned in an abutting arrangement with corresponding faying surfaces. A backing plate is attached across the abutment. The plates are friction stir welded along the faying surfaces, the friction stir weld including a weld root that terminates in the backing plate. After welding, the backing plate is removed, including the weld root, to create a welded blank. The blank is then formed into a desired component shape, heat treated and aged to produce the final large metallic component. The resulting friction stir weld has a stable microstructure with minimal or no abnormal grain growth during high-temperature forming, heat treatment, or aging.

To provide a lifting fixture and a lifting method capable of safely lifting an installed article horizontally without tilting it.SOLUTION: A lifting fixture 30 for stably lifting an installed article which is detachably installed on the upper surface of a structure and in which the geometrical center of a joined surface joined to the upper surface and the intersection point of a perpendicular line passing through the gravity center of the installed article and the joined surface do not align with each other comprises: a band clamp 31 (31A, 31B) that surrounds and holds the installed article from the outside along the outer periphery of a horizontal surface crossing the installed article; a first lifting part 32 that extends in a vertical direction from the edge (31A) of the band clamp 31 (31A, 31B) and has a hook provided at the end; and a second lifting part 33 that is provided at the edge (31B) of the band clamp 31 (31A, 31B). The position of the first lifting part 32 is adjusted so that the gravity center position of the installed article can be set on a line connecting the first and second lifting parts 32 and 33 in a plan view.SELECTED DRAWING: Figure 3

The application discloses a metal base surface treatment process for realizing metal-glass laser welding, which comprises the following steps: S1: first, metal and glass are cleaned with deionized water for 5-10 minutes, and then cleaned with alcohol for 5-10 minutes; S2: the cleaned materials are dried in a drying box; S3: the metal is subjected to surface treatment to modify the metal surface; S4: the glass and the metal are overlapped together, a light beam generated by a laser is focused on a joint surface of the glass and the metal to perform laser welding, the laser is absorbed by the underlying metal after penetrating through the glass, a heat action zone is formed, the metal and the glass are melted in the heat action zone, and the two are diffused to form a welded joint, and the welding is completed. The metal surface is modified by means of laser surface cleaning or metal surface coating before laser welding, the welding strength between the glass and the metal is effectively improved, the two surface treatment modes can be selectively used or simultaneously used, and the organic adhesive connection is avoided.

The present invention provides a method for manufacturing a reactor and a reactor that firmly joins the molded core and molded coil, and prevents damage to the welded joints of the busbar and lead wires. [Solution] The method for manufacturing the reactor includes an adhesive bonding step of joining molded cores 1a, 1b and molded coil 5 with an adhesive, and a welding step of connecting the lead wires of the coil 6 and the busbar fixed to the molded core 1a by welding. The coil 6 is mounted on the leg portion 23. The adhesive bonding step includes applying adhesive 8 to the joint surface 231 of the leg portion 23 of the core member and the inner circumferential surface 241 of the yoke portion 24, pressing the applied adhesive 8 to spread it out, and a curing step for the adhesive. In the pressing step, the adhesive 8 applied to the joint surface 231 is pressed out, causing it to overflow onto at least one of the upper and lower surfaces of the leg portion 23, and at least one of the inner side surface 236 and outer side surface 237 of the leg portion 23, and to adhere to the molded coil 5.

The utility model discloses a fixed ultrasonic welding machine for a reinforcing band of a plastic composite pipe, and belongs to the technical field of plastic base pipe forming. The center of the mounting plate is provided with a through hole for a base pipe to pass through, and a reinforcing belt is wound on the surface of the base pipe; the at least three ultrasonic welding mechanisms are evenly distributed on the mounting plate, each ultrasonic welding mechanism comprises a welding head, the welding heads are used for making contact with reinforcing belts on the surface of the base tube and applying pressure, and friction heat is generated on the joint faces between the reinforcing belts and the base tube or between the adjacent reinforcing belts for welding through high-frequency vibration of the welding heads; the sum of the contact perimeters of the welding heads and the base tube is larger than or equal to the perimeter of the base tube. As the reinforcing belt and the base pipe do not need to be preheated, the problem that gaps between adjacent belts are changed after winding due to the fact that the preheated reinforcing belt is heated and stretched under the action of tension is avoided, the problem that the base pipe is stretched and deformed due to heating in the forward traction process is also avoided, and the quality of the formed composite pipe is guaranteed.

The article is a metal fitting for fastening an object to be fixed, such as an angle bar that supports a support object, such as a cable rack or an earthquake-resistant frame, to a structure such as an H-beam, and comprises a clamping member formed in a substantially triangular shape in plan view and a substantially L-shaped shape in side view, a hexagon socket head bolt with a pointed tip that is threaded into a screw hole provided in the clamping member and attached so as to protrude toward the structure, an adjustment bolt with a recessed tip that is threaded into a screw hole provided in the clamping member and can advance and retreat relative to the structure, a locking nut that is threaded onto the adjustment bolt between the head of the adjustment bolt and the clamping member, a complete screw that passes through an insertion hole provided in the clamping member, and a break groove on the outer periphery that threads into one side of the complete screw and breaks when a predetermined tightening torque value is applied to a tightening operation section, and the break groove and a torque management nut characterized in that, when the clamping member breaks, the tightening operation portion is removed from the breaking groove, leaving the other side of the tightening operation portion behind; a clamping nut that is screwed onto the other side of the complete screw by a protrusion provided on the upper surface of the clamping member in a state where it does not rotate relative to the complete screw; and a washer that is attached to the complete screw and presses the object to be fixed from below together with the torque management nut, wherein the protruding portion of the hexagon socket head bolt is abutted against the upper surface of the flange of the structure, the complete screw is inserted into an insertion hole provided in the object to be fixed, and the structure and the object to be fixed are clamped and fixed together by tightening the torque management nut with the clamping member and the washer in this state. As shown in Reference Figures 1 to 3, which show the state of use, the length of protrusion of the adjustment bolt from the underside of the clamping bracket is adjusted according to the flange thickness of the H-shaped steel structure, and the height of the clamping bracket relative to the angle bar, which is the object to be fixed, thereby making it possible to maintain a state in which all the screws are approximately perpendicular to the joint surface between the H-shaped steel and the angle bar, and the product is attached to the angle bar by inserting all the screws into the insertion holes of the angle bar.The product is then placed so that the flange of the H-shaped steel is clamped between the protruding portion of the hexagon socket bolt of the clamping bracket and the angle bar, and the tightening operating portion is tightened until the breaking groove of the torque management nut breaks, thereby tightening it to the appropriate tightening torque value and clamping and joining it with the tip of the hexagon socket bolt embedded in the flange of the H-shaped steel and the adjustment bolt embedded in the angle bar.

The invention discloses an aluminum / steel dissimilar metal friction stir welding process, and belongs to the technical field of friction stir welding. The method comprises the following steps: step 1, polishing the surfaces of an aluminum base material and a steel base material, washing and drying; 2, the 5083 aluminum alloy and the SS400 steel are placed on a friction stir welding machine tool workbench, the joint faces are tightly attached, the butt joint mode is that the steel is placed on the advancing side, the aluminum is placed on the retreating side, and a W-15% Re conical unthreaded stirring needle serves as a used stirring head; and 3, welding parameters are set, specifically, the rotating speed ranges from 270 rpm / min to 750 rpm / min, the welding speed ranges from 50 mm / min to 120 mm / min, the offset ranges from 0.02 mm to 0.2 mm, the dip angle ranges from 1.5 degrees, and the pressing amount ranges from 0.05 mm to 0.1 mm, and welding is conducted. According to the method, other welding parameters except the rotating speed and the welding speed are fixed, the heat input is adjusted only by adjusting the rotating speed and the welding speed, the welding process is simple, the welding time is short, and the efficiency is high.

Aspects of the disclosure include a joining strategy for resistance spot welding and components manufactured therein. An exemplary vehicle comprises a welded component with two or more layers. The welded component comprises a first metal layer with a first conductivity and a second metal layer with a second conductivity. The first and second metal layers are joined at a joint surface of a resistance spot weld. The resistance spot weld comprises a continuous intermetallic layer at the joint surface directly between the first and second metal layers, as well as a pair of laser welds arranged on opposite sides of the continuous intermetallic layer. The two laser welds penetrate the second metal layer and terminate in the first metal layer.The two laser welds extend into the first metal layer across the uppermost surface of the continuous intermetallic layer.

The utility model aims at providing an electroslag welding slag leakage prevention assembly which is characterized by comprising a partition plate, a first baffle and a second baffle, the first baffle and the second baffle are fixedly connected to the two sides of the partition plate respectively and extend out of the edge of the same side of the partition plate, and the side end face, located between the first baffle and the second baffle, of the partition plate is a welding face. The welding surface and two opposite side surfaces of the first baffle plate and the second baffle plate form a melting groove; the first baffle and the second baffle each comprise a joint face parallel to the welding face and in the same direction, and a plurality of containing through grooves which are different in depth and penetrate in the length directions of the containing through grooves are formed in the two joint faces. The slag leakage prevention assembly further comprises filler which is made of flexible fireproof materials and can be placed in the containing groove, and the top of the filler is higher than the joint face after the filler is placed. By means of the mode that the containing through grooves with the different depths are formed in the joint face of the baffle and matched with the filler, the assembling gaps with the variable sizes are filled, and therefore slag leakage is avoided, and meanwhile the welding effect can be improved.

The application discloses a double-track flaw detection vehicle intelligent water spraying device, which comprises a water tank, a constant pressure pump, three flow meters, three electromagnetic valves, three spray heads, connecting pipelines and a controller. The water tank is connected with the constant pressure pump, the constant pressure pump is connected with the three spray heads through the connecting pipelines, one flow meter and one electromagnetic valve are arranged on the pipeline of each of the three spray heads. The constant pressure pump provides constant water pressure, and the controller controls the opening and closing of each electromagnetic valve to control water spraying or stopping. The first spray head among the three spray heads is perpendicular to the surface of the steel rail and plays a role of pre-wetting the steel rail. The second spray head is opposite to the surface of the wheel type probe and plays a role of wetting the wheel type probe. The third spray head is opposite to the joint surface of the steel rail and the wheel type probe and directly fills the small gap between the steel rail and the wheel type probe. The application has reasonable structure layout and good coupling effect.

A welding method is executed by a welding system in which identification signs are arranged on a plurality of original workpieces to be used in a welding process, respectively. On the identification signs, identifiers of the respective original workpieces are readable. The welding method includes executing the welding process such that a part or an entire of the identification signs is hidden in a joint surface on which the plurality of original workpieces are joined in the welding process.

The present invention relates to a susceptor and a method for manufacturing the same, in a method for manufacturing a base body of the susceptor of the present invention, the base body comprises: a lower plate and an upper plate, each of which is made of a respective material; and a bonding surface between the lower plate and the upper plate, the substrate manufacturing method may include: a step of sequentially laminating a first active metal layer and a first aluminum layer on the bonding surface of the upper plate; a step of sequentially laminating a second active metal layer and a second aluminum layer on the bonding surface of the lower plate; and a step of sandwiching a brazing filler layer between the first aluminum layer of the upper plate and the second aluminum layer of the lower plate, and converting the brazing filler layer, the first aluminum layer, and the second aluminum layer into a brazing bonding layer by heat treatment to braze-bond the lower plate and the upper plate.

A method for manufacturing a hollow vehicle frame part includes: removing material from a first side of a first billet to create a first inner shape of a target vehicle frame such a substantially angled faying surface remains adjacent to the first inner shape; removing material from a first side of a second billet to create a second inner shape, such that a substantially angled faying surface is left on the first side of the second billet adjacent to the second inner shape; bonding the first and second billets together at the faying surfaces such that the first and second inner shapes face each other and such that the angled faying surfaces together form a bevel-type joint; after bonding, removing material by machining from the second sides of the first and second billets to create target outer shape of the vehicle frame part.

The invention discloses a blue light welding and stress control composite process for a cathode bar. Belongs to the technical field of cathode bar processing, and can realize efficient melting of a copper material by adopting blue laser with a specific wavelength, and synchronously apply an external physical field to a welding area for dynamic regulation and control, so that high-quality metallurgical connection of a copper core and a stainless steel sleeve is realized, and welding stress and deformation are synchronously controlled. According to the blue light welding and stress control composite process for the cathode bar, the cathode bar is composed of an internal copper core and an external wrapping stainless steel sleeve, and the blue light welding and stress control composite process is characterized by comprising the following steps that S1, joint face pretreatment is conducted, specifically, the end face of the copper core and the corresponding end face of the stainless steel sleeve are cleaned; s2, blue laser welding, wherein blue laser with the wavelength of 440 nm to 460 nm is adopted, and scanning welding is conducted on an annular end face joint between the copper core and the stainless steel sleeve; and S3, synchronous stress regulation and control are conducted, specifically, in the welding process of the step S2 and the initial solidification stage of a molten pool, an external physical field is synchronously applied to a welding area so as to dynamically release welding stress.

The invention discloses a post-cast strip structure and heat preservation integrated forming construction method, and belongs to the technical field of constructional engineering construction.The method includes the steps that floating dust and sundries in a post-cast strip groove and on pre-cast concrete connecting faces on the two sides are cleaned, the connecting faces are subjected to roughening treatment, and steel bars exposed in the area are derusted; then a continuously-through steel reinforcement framework is bound in the post-cast strip groove; connecting pieces are installed on the heat preservation composite board, and a metal net is laid on the outer side and firmly fixed to the connecting pieces through binding steel wires; the inner formwork and the heat preservation composite board are oppositely pulled and fixed through a plurality of sets of split bolts, a closed pouring space is formed, and the connecting piece partially extends into the space; then concrete is poured and vibrated to be compact, and maintenance is conducted till the design strength is achieved; and after the strength of the concrete meets the requirement, the inner formwork and the split bolts are removed, and bolt remaining holes are blocked. According to the method, post-cast strip structure construction and heat preservation construction can be completed synchronously, and the construction efficiency, the building thermal performance and the structure durability are improved.

This article is a metal fitting for fastening an object to be fixed, such as an angle bar that supports a supported object, such as a cable rack or earthquake-resistant frame, to a structure such as an H-shaped steel beam, and is made up of a clamping bracket that is formed in a roughly triangular shape in plan view and a roughly L-shaped shape in side view, a hexagon socket head bolt with a pointed tip that is screwed into a screw hole provided in the clamping bracket and attached so as to protrude towards the structure, an adjustment bolt with a recessed tip that is screwed into a screw hole provided in the clamping bracket and can advance and retreat relative to the structure, and a connection between the head of the adjustment bolt and the clamping bracket. and a locking nut threaded onto the adjustment bolt between the clamping bracket and the hexagon socket head bolt, the protruding portion of the hexagon socket head bolt being abutted against the upper surface of the flange of the structure, a clamping bolt inserted into an insertion hole of the fixed object being inserted into an insertion hole of the clamping bracket and a clamping nut being threaded onto the upper surface of the clamping bracket, the fixed object being disposed between the clamping bracket and the head of the clamping bolt, and the structure and the fixed object being clamped together by tightening the clamping bolt. As shown in Reference Figures 1 to 3 showing a usage state, the length of protrusion of the adjustment bolt from the underside of the clamping bracket is adjusted according to the flange thickness of the H-shaped steel structure, and the height of the clamping bracket relative to the angle iron being the fixed object is adjusted, thereby maintaining the clamping bolt approximately perpendicular to the joint surface between the H-shaped steel and the angle iron, and the clamping bolt is inserted into the insertion hole of the angle iron to attach the article to the angle iron. The tightening bolts in the reference diagrams showing the state of use are fully threaded with torque control nuts attached to the heads of the tightening bolts. The product is then positioned so that the flange of the H-beam is clamped between the protruding portion of the hexagon socket head bolt of the clamping bracket and the angle bar, and the tightening bolt is then tightened, clamping and fixing the end of the hexagon socket head bolt to the flange of the H-beam and the adjustment bolt to the angle bar.

The utility model provides a joint structure. The joint structure comprises a lower welding pad, an upper welding pad in contact with the lower welding pad, and a dielectric layer wrapping the lower welding pad and the upper welding pad, a plurality of holes are formed in the lower welding pad and / or the upper welding pad; the interior of at least one hole close to the joint face of the lower welding pad and the upper welding pad is not provided with a dielectric material used for forming the dielectric layer. In the bonding structure, the hole close to the bonding surface of the lower bonding pad and the upper bonding pad is hollow, and no dielectric material exists, so that the bonding yield can be improved.

A manifold includes a first housing forming a first opening portion and a second housing forming a second opening portion. Each joint surface of the first opening portion and the second opening portion is welded to each other, thereby integrating the first housing and the second housing with each other and forming a housing including a fluid space inside. The housing includes a rib formed on at least one of an outer peripheral side of an opening edge of the first opening portion and an outer peripheral side of an opening edge of the second opening portion. The rib protrudes outward along a surface parallel to the joint surface.

The invention relates to a welding method for producing a weld seam 1 having at least one pinhole 2 during a welding process 200 of two welding partners 3, 4 in order to form a weld group 5, the welding partners 3, 4 each having a joining surface 6, 7, the welding partners 3, 4 being arranged adjacent to and / or in contact with the joining surfaces 6, 7 during the welding process 200 in order to form a joint 8, wherein, before the welding process 100, at least one of the joining surfaces 6, 7 is contaminated 100 by a contamination medium 10 in a contamination region 11, and wherein, during the welding process 200, at least one pinhole 2 is formed in the weld seam 1 at the joint 8.

The invention relates to the technical field of gas cylinder welding, machining and manufacturing, and discloses an automatic welding device for a vehicle gas cylinder, which comprises a bottom frame body and side frame bodies welded on two sides of the bottom frame body, and a cylinder body clamping assembly for positioning and feeding a cylinder body of the gas cylinder is arranged at the top of the bottom frame body and located in the middle position; bottle end cover clamping assemblies for positioning and feeding gas cylinder end covers are mounted at the two ends of the top of the bottom frame body through bottle end cover displacement driving modules. Two groups of correction assemblies are arranged at the top of the bottom frame body; full-process automation is achieved through cooperation of multiple modules and multiple parts, multiple stations and actions such as feeding, correcting, positioning, clamping and welding are integrated, continuous automatic production from parts to finished products is achieved through sequential control over the driving modules and the air cylinders, the manual operation intensity and the skill requirement are reduced, and the production efficiency is improved. And the shape precision and the position precision of the joint face of the to-be-welded workpiece are effectively guaranteed, and the welding consistency is high.

A system and method for fusing at least two thermoplastic composite components together may include placing faying surfaces of the thermoplastic composite components in contact with each other, placing a separation layer over and against one of the thermoplastic composite components, and placing a multi-layer composite pressure pad over and in contact with the separation layer. The method may also include placing an activated inductor against the multi-layer composite pressure pad for induction welding the two thermoplastic composite components to each other. The thermoplastic composite components may comprise conductive fibers while the multi-layer composite pressure pad may comprise a first layer and a second layer with non-conductive fibers. The first layer may at least partially melt during induction welding of the two thermoplastic composite components while the second layer may remain rigid throughout this welding.

The present application belongs to the technical field of wind tunnel equipment manufacturing, and discloses a manufacturing method of a large low-temperature equipment contraction section outlet flange. The manufacturing method comprises the following steps: preparing a contraction section shell bevel; splitting the outlet flange; assembling the outlet flange; welding the outlet flange; and polishing the weld. The manufacturing method prepares the bevel while cutting the contraction section shell surplus, greatly reducing the cutting deformation; by using different bevel forms at the upper wall, lower wall, left side wall, right side wall and round corner, the problem of difficult preparation of the bevel angle of the contraction section shell outlet end face caused by the change of the included angle between the contraction section shell outlet end face and the outlet flange is solved. By adopting the method of plasma cutting the outlet flange to manufacture the extension curved surface of the inner wall surface of the outlet flange, the smooth transition of the joint surface is achieved by polishing, mechanical processing is avoided, and cost is saved. By installing a deformation prevention support at the outlet of the contraction section shell, the welding deformation is controlled, the contraction section profile precision is improved, and the method has engineering practical value.

This article is a metal fitting for fastening an object to be fixed, such as an angle bar that supports a supported object, such as a cable rack or earthquake-resistant frame, to a structure such as an H-shaped steel beam, and is made up of a clamping bracket that is formed in a roughly triangular shape in plan view and a roughly L-shaped shape in side view, a hexagon socket head bolt with a pointed tip that is screwed into a screw hole provided in the clamping bracket and attached so as to protrude towards the structure, an adjustment bolt with a recessed tip that is screwed into a screw hole provided in the clamping bracket and can advance and retreat relative to the structure, and a connection between the head of the adjustment bolt and the clamping bracket. and a locking nut threaded onto the adjustment bolt between the clamping bracket and the hexagon socket head bolt, the protruding portion of the hexagon socket head bolt being abutted against the upper surface of the flange of the structure, a clamping bolt inserted into an insertion hole of the fixed object being inserted into an insertion hole of the clamping bracket and a clamping nut being threaded onto the upper surface of the clamping bracket, the fixed object being disposed between the clamping bracket and the head of the clamping bolt, and the structure and the fixed object being clamped together by tightening the clamping bolt. As shown in Reference Figures 1 to 3 showing a usage state, the length of protrusion of the adjustment bolt from the underside of the clamping bracket is adjusted according to the flange thickness of the H-shaped steel structure, and the height of the clamping bracket relative to the angle iron being the fixed object is adjusted, thereby maintaining the clamping bolt approximately perpendicular to the joint surface between the H-shaped steel and the angle iron, and the clamping bolt is inserted into the insertion hole of the angle iron to attach the article to the angle iron. The tightening bolts in the reference diagrams showing the state of use are fully threaded with torque control nuts attached to the heads of the tightening bolts. The product is then positioned so that the flange of the H-beam is clamped between the protruding portion of the hexagon socket head bolt of the clamping bracket and the angle bar, and the tightening bolt is then tightened, clamping and fixing the end of the hexagon socket head bolt to the flange of the H-beam and the adjustment bolt to the angle bar.

The purpose of the present invention is to provide: a resistance spot welded joint; a method for manufacturing the same; and a method for evaluating the peel strength of the welded joint. The present invention is a resistance spot welded joint having a nugget formed on a steel plate mating surface in a plate set in which a plurality of steel plates including at least one high-strength steel plate are stacked, a corona bond, and a heat-affected zone, wherein: the high-strength steel plate has a tensile strength of 980 MPa or greater; the decarburized layer thickness d (µm) of a surface layer of the high-strength steel plate and the C content X (mass%) at a position of 10 µm in the plate thickness direction from a steel plate surface of the high-strength steel plate satisfy formula (1); and the average hardness in a region from the corona bond to 30 µm in the plate thickness direction is lower than the average hardness of a base material steel plate by 10% or more. (1): 10 < d(1−X) < 300

The invention provides a method for calculating and analyzing a corner static stiffness model of a cradle turntable, and relates to the technical field of precision machine tools. Firstly, the absolute linear displacement and the corner displacement of each key deformation position of a rotary table in the coordinate axis direction of a fixed coordinate system are assumed, and the absolute displacement difference of two parts in contact is the contact deformation of the parts; three-dimensional coordinate system transformation is adopted, force in a fixed coordinate system is transformed into a rotating coordinate system through a rotating matrix, and key parts such as a part combination surface and a rotating table bearing of the C shaft of the rotating table are analyzed under the rotating coordinate system; each roller of the bearing is sliced, and then a contact deformation model between the rollers and a raceway is established; the contact rigidity of the joint surface is calculated by adopting an MB parting principle aiming at analysis of the joint surface of the parts. Deformation among the workbench, the bearing, the swing frame, the mandrel, the bearing and the shell is comprehensively overlaid on the workbench surface, and the corner static rigidity of the cradle rotary table under the action of cutting force is constructed.

The present disclosure provides an assembly for suspending a material. The assembly for suspending a material includes a base fixture and a material coupling. The basic fixing part comprises a first joint surface and a second joint surface, the first joint surface extends in the first direction and forms a first joint structure, and the first joint surface is fixed to the bearing body through the first joint structure; the second joint surface extends along a second direction and forms a second joint structure. A material coupling connected to the base fixture, the material coupling comprising a first portion and a second portion, the first portion being at least partially positioned within the material; the second portion extends along the second direction and forms a third joint structure. According to the assembly for hanging the material, welding operation is not needed in the construction process, the construction efficiency is improved, the integrity of a building is enhanced, the attractiveness is improved, the distance between the material and the bearing body can be adjusted through the adjustable connecting mode of the material coupling piece and the foundation fixing piece, and the assembly is suitable for different construction scenes.

Methods for resistance welding, resistance-welded assemblies, and vehicles including resistance-welded assemblies are provided. The method includes providing a workpiece stack-up including first and second workpieces and an intermediate material located between the faying surfaces thereof. At least one of the first workpiece and the second workpiece is formed of a first metal alloy with a first concentration of an alloying element, and the intermediate material is formed of a second metal alloy of the first metal and a second concentration of the alloying element that is less than the first concentration. The method includes bringing electrodes into contact with the workpieces, passing an electrical current therebetween to form a molten weld pool, and cooling the molten weld pool into a weld nugget that forms all or part of a weld joint between the workpieces and has a composition that is a mixture of the workpieces and the intermediate material.

The utility model provides riveting equipment for a safety belt retractor connecting plate, and belongs to the technical field of automobile safety belt retractor production equipment. According to the riveting equipment, the gap between the retractor and the binding face of the connecting plate is eliminated through the flattening module, the position of the connecting plate can be adjusted in the horizontal direction and the vertical direction through the connecting plate harness, and the height of a riveted rivet is detected through the displacement sensor; the problems that in the prior art, defective products are prone to occurring in riveting equipment, and all workpieces are difficult to detect are solved. The riveting equipment comprises a flattening module which is used for pressing the retractor and the connecting plate which are well placed and eliminating a gap between the faying surfaces of the retractor and the connecting plate; the displacement sensor is used for detecting the height of the rivet after the retractor and the connecting plate are riveted together; the connecting plate harness can adjust the position of the connecting plate in the horizontal direction and the vertical direction.

A thick steel plate assembly welded by laser welding and a laser welding method thereof are disclosed. The thick steel plate assembly comprises two steel plates and a filler region. A joint face of the steel plates extends along a joint line. At least one portion of the joint face of one of the thick plate steels is formed with a groove along a grooving line. The filler region is formed by feeding a filler into the groove and using a laser to weld the joint face having the groove through the filler. After the filler region is cooled and solidified, the thick steel plates are combined with each other. A thickness of each filler layer in the filler region is between 4 and 6 mm. Thus, the process can be simplified greatly and the cost can be reduced.