CN213458535U

CN213458535U - Training is with boiler water wall pipe simulation welding work frame

Info

Publication number: CN213458535U
Application number: CN202022715545.4U
Authority: CN
Inventors: 王志红; 刘松善; 刘群; 周桂萍; 贾芊; 华玉荣; 赵培鲁
Original assignee: State Grid Corp of China SGCC; State Grid of China Technology College; Shandong Electric Power College
Current assignee: State Grid Corp of China SGCC; State Grid of China Technology College; Shandong Electric Power College
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-06-15
Anticipated expiration: 2030-11-20

Abstract

The application provides a simulation welding working frame of a boiler water wall pipe for training, which relates to the field of welding teaching aids and comprises a first pipe bank and a second pipe bank which are connected, wherein the first pipe bank comprises a first branch pipe and a rectangular frame type first support, a plurality of first branch pipes are sequentially arranged in the first support at intervals and in parallel, the second pipe bank comprises a second branch pipe and a rectangular frame type second support, a plurality of second branch pipes are sequentially arranged in the second support at intervals and in parallel, at least one first branch pipe and at least one second branch pipe are cut, each cut branch pipe forms two sections which are arranged at intervals, the first pipe bank and the second pipe bank are jointly rotatably arranged on a rack, the simulation welding working frame of the water wall pipe can be specially used for adjusting the angle of a position to be operated, the scene of arranging a transverse pipe and a vertical pipe, and setting a cutting position to arrange a clamp to clamp a butt joint pipe which is simulated to be welded, the actual welding scene is simulated through the clamping butt joint pipe, and the operation proficiency in the process of welding the water wall pipe is effectively improved.

Description

Training is with boiler water wall pipe simulation welding work frame

Technical Field

The application relates to the field of welding teaching aids, in particular to a simulated welding work frame for a water wall pipe of a training boiler.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

When welder training is carried out, welding operation is carried out on the corresponding position according to regulation requirements, when the pipe fittings are welded, welding operation training is carried out in a mode that two pipe fittings are independently butted, and the welding operation in the training process and the field welding operation are different greatly.

The inventor finds that the existing boiler water wall tube is of a tube bank structure with a plurality of parallel pipelines, the number of the tubes is large, the tube diameter is small, the distance between every two adjacent tubes is small, and compared with the tube welding operation in the training and training process, the existing boiler water wall tube is not suitable for the water wall tube welding operation in the actual scene, so that the boiler water wall tube has poor welding quality and low qualification rate; the welding training equipment in the training process cannot simulate the on-site pipe distribution condition of the water wall pipe, so that the training efficiency of the welding operation for the boiler water wall pipe is low, and reasonable and effective simulation welding training cannot be carried out; in addition, in the training process, the training equipment for building the simulation water wall pipe can only realize the simulation welding at a single angle, and the trend of the water wall pipe in the actual scene is in different directions, so that the existing training equipment for simulating the water wall pipe cannot meet the requirement of welding training.

Disclosure of Invention

The purpose of this application is to the defect that prior art exists, a boiler water wall pipe simulation welding work frame is used in training is provided, build and be exclusively used in water wall pipe simulation welding work frame, can adjust the angle of treating the operating position, the scene that violently manage and the standpipe distributes is managed in the configuration, and set up and cut the position and arrange anchor clamps centre gripping simulation welded butt joint pipe, through the actual welding scene of centre gripping butt joint pipe simulation, only need change butt joint pipe alright carry out the operation of repeated water wall pipe simulation welding in order to reach reuse work frame, operation proficiency when effectively improving the welding water wall pipe.

In order to realize the purpose, the following technical scheme is adopted:

the utility model provides a training is with boiler water wall pipe simulation welding work frame, including continuous first bank of tubes and second bank of tubes, first bank of tubes includes first branch pipe and the first support of rectangle frame-type, many first branch pipes interval and parallel arrangement are in proper order in first support, the second bank of tubes includes second branch pipe and rectangle frame-type second support, many second branch pipes interval and parallel arrangement are in proper order in the second support, first branch pipe and second branch pipe axis are perpendicular and coplane, at least one first branch pipe and at least one second branch pipe cut, every branch pipe that cuts all forms two sections that the interval set up, first bank of tubes and second bank of tubes rotate jointly and install in the frame.

Furthermore, one end of the first branch pipe is connected with one frame of the first support, the other end of the first branch pipe is connected with the other frame of the first support, and the first branch pipes connected with the first support are arranged at equal intervals.

Furthermore, one end of the second branch pipe is connected with one frame of the second support, the other end of the second branch pipe is connected with the other frame of the second support, and the second branch pipes connected with the second support are arranged at equal intervals.

Further, one frame of the first support is shared with one frame of the second support, and the first support and the second support are arranged in a coplanar mode.

Furthermore, a clamp is installed at the free end of the branch pipe formed by cutting the first branch pipe and the second branch pipe.

Further, anchor clamps include elastic ring and at least three clamping jaw, and the clamping jaw is along the hoop evenly connected elastic ring outer lane, and the elastic ring can overlap and establish on the branch pipe, and the clamping jaw stretches out and forms the clamping part outside the branch pipe.

Furthermore, the two ends of the connecting position of the first tube bank and the second tube bank are respectively connected with the rack through revolute pairs, and the rotation axes of the two revolute pairs are arranged in a collinear manner.

Furthermore, the rack comprises two oppositely arranged support rods, one support rod is connected with one revolute pair to form a rotary connection, and the other support rod is connected with the other revolute pair to form a rotary connection.

Furthermore, the side surface of the supporting rod is connected with a revolute pair, and the bottom end of the supporting rod is connected with a base.

Furthermore, the revolute pair is matched with a locking mechanism for locking or unlocking a relative included angle between the tube bank and the rack.

Compared with the prior art, the application has the advantages and positive effects that:

(1) the special working frame for the simulated welding of the water wall pipe is built, the angle of the position to be operated can be adjusted, the cutting position arrangement fixture is arranged to clamp the butt joint pipe in the simulated welding, the actual welding scene is simulated by clamping the butt joint pipe, the repeated simulated welding operation of the water wall pipe by using the working frame can be achieved by only replacing the butt joint pipe, and the operation proficiency in the welding of the water wall pipe is effectively improved;

(2) the method comprises the following steps of determining to set up a working frame for simulation operation according to the scene and actual conditions, performing simulation welding practice examination on corresponding test pieces on a simulation welding working frame for the boiler water-cooled wall after the examination of a welder in a training workshop is qualified, and obviously improving the welding quality of the boiler water-cooled wall pipe fittings welded on the scene after the practice examination is qualified, so that the welding work efficiency is improved, the times of weld joint repair and excavation are reduced, and the safe operation of a unit is guaranteed;

(3) the method comprises the following steps of simulating an actual water wall pipe by adopting a pipe row structure, cutting branch pipes to form a cutting part, configuring replaceable joint pipes for simulation operation, simulating the water wall pipes on two sides of a welding position under an actual scene by using the branch pipes on two sides of the joint pipes, and training operation when barrier pipes are arranged on two sides of the welding position under the actual scene, so that the proficiency of welding the water wall pipes is improved;

(4) the cutting parts are positioned at different axial positions of the branch pipe, different welding positions and welding height scenes in an actual scene are simulated, and an operation scene of the actual scene can be simulated by matching with the working frame which can rotate to change the direction of the branch pipe, so that the actual training requirement is met;

(5) the electric arc welding operation is adopted for the scenes without the need of performing shielded welding on the middle filling layer and the cover surface layer, and compared with the existing argon arc welding operation, the operation difficulty of the segmented welding is reduced on the basis of ensuring that the strength and the sealing property of a welding line meet the requirements, the labor efficiency can be improved, and the production cost can be reduced;

(6) the selection of the welding direction in the welding process not only facilitates the operation of a welder, but also can reduce the stress of the welding seam and ensure the quality of the welding seam.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic structural diagram of a tungsten electrode after polishing in

embodiments

1 and 2 of the present application;

FIG. 2 is a schematic structural diagram of a pipe butt joint groove in

embodiments

1 and 2 of the present application;

FIG. 3 is a schematic view of a welding spot for positioning a butt pipe in

embodiments

1 and 2 of the present application;

FIG. 4 is a sectional view of the backing weld in examples 1 and 2 of the present application;

FIG. 5 is a schematic view showing the relative positions of the welding wire, the workpiece and the welding gun in examples 1 and 2 of the present application;

FIG. 6 is a schematic sectional view of a filling weld in examples 1 and 2 of the present application;

FIG. 7 is a schematic view showing the relative positions of the welding torch and the workpiece in

embodiments

1 and 2 of the present application;

FIG. 8 is a schematic diagram of the relative positions of the welding structure and the arc striking point in

embodiments

1 and 2 of the present application;

FIG. 9 is a schematic view of the welding of the cover welding in examples 1 and 2 of the present application;

FIG. 10 is a schematic view showing the positions of two weld seams of the cap weld in examples 1 and 2 of the present application;

fig. 11 is a schematic structural view of a work frame in

embodiments

1 and 2 of the present application.

Wherein: 1. the device comprises a stand column, 2, a first pipe row, 3, a revolute pair, 4, a base, 5 and a second pipe row.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting in this application.

As introduced in the background art, in the prior art, welding operation training is performed in a mode that two pipe fittings are independently butted, so that the welding operation in the training process is greatly different from the field welding operation, and the training equipment for building the simulated water wall pipe can only realize simulated welding at a single angle, while the water wall pipe in the actual scene moves in different directions, so that the existing training equipment for simulating the water wall pipe cannot meet the requirement of welding training; aiming at the problems, the application provides a simulation welding working frame for a water wall tube of a boiler for training and a corresponding working method.

Example 1

In an exemplary embodiment of the present application, a simulated welding rig for water wall tubes of a training boiler is provided, as shown in fig. 1-11.

The working frame comprises a rack, a pipe row structure and a revolute pair 3, the pipe row structure comprises a first pipe row 2 and a second pipe row 5, the first pipe row comprises first branch pipes and first supports, a plurality of first branch pipes are sequentially arranged in the first supports at intervals in parallel, the second pipe row comprises second branch pipes and second supports, and a plurality of second branch pipes are sequentially arranged in the second supports at intervals in parallel;

when the whole tube bank structure is in a vertical state, the first branch tube is in a vertical state, the second branch tube is in a horizontal state, and the water wall tubes in the vertical state and the water wall tubes in the horizontal state are simulated respectively;

the axes of the first branch pipe and the second branch pipe are vertical and coplanar, one frame of the first support is shared with one frame of the second support, and the first support and the second support are arranged in a coplanar manner.

One end of the first branch pipe is connected with one frame of the first support, the other end of the first branch pipe is connected with the other frame of the first support, and the first branch pipes connected with the first support are arranged at equal intervals;

one end of the second branch pipe is connected with one frame of the second support, the other end of the second branch pipe is connected with the other frame of the second support, and the second branch pipes connected with the second support are arranged at equal intervals.

At least one first branch pipe and at least one second branch pipe are cut, each cut branch pipe forms two sections arranged at intervals, and the first pipe row and the second pipe row are installed on the rack in a rotating mode together.

In this embodiment, only the first tube row structure is taken as an example, and the detailed structure thereof is described:

the first pipe row comprises a plurality of branch pipes which are sequentially arranged at intervals, a first branch pipe and a last branch pipe of the first pipe row are respectively connected with the rack through revolute pairs, at least one branch pipe is cut in the branch pipes between the first branch pipe and the last branch pipe, the cut branch pipes form two sections which are arranged at intervals, and clamps are arranged at the end parts of the branch pipes corresponding to the cutting positions;

build the work frame that is exclusively used in water wall pipe analogue welding, can adjust the angle of treating the operating position to the setting cuts the position and arranges anchor clamps centre gripping analogue welding's butt joint pipe, through the actual welding scene of centre gripping butt joint pipe simulation, only need change butt joint pipe alright carry out the operation of repeated water wall pipe analogue welding with reaching reuse work frame, operation proficiency when effectively improving the welding water wall pipe.

For the frame, in the embodiment, the frame comprises a base 4 and a column 1 installed on the base, wherein the base is fixed on the ground by using a 400 × 400 × 12mm steel plate and using expansion screws; the upright posts are welded on a steel plate base with the thickness of 400 multiplied by 12mm by 150mm channel steel.

Two ends of the branch pipes are aligned, one end of each branch pipe is connected with the same support plate, and the other end of each branch pipe is connected with the other support plate to form a first pipe row together;

in this embodiment, 10 phi 60 × 5 × 1700mm steel pipes can be used, arranged on a steel plate or a flat cement ground, and arranged side by side in order, two ends of which are sealed by 60 × 5 × 870mm angle steel, and the space between the steel pipes is respectively filled with 3 30 × 50 × 12mm iron blocks in the length direction, wherein two of the steel pipes are respectively placed at the positions 350mm away from the two ends of the steel pipe, and the other steel pipe is placed at the middle position of the length of the steel pipe;

and sequentially performing spot welding on three pipe plugs from right to left until spot welding of 10 steel pipes is completed, performing spot welding on angle steel at two ends and each steel pipe, and welding after adjusting the size and the flatness of 10 pipe banks.

Of course, it can be understood that other specifications can be selected for the manufacturing materials of the frame and the tube bank, such as adjusting the length, diameter and wall thickness of the branch tube, and the first tube bank is constructed by selecting the same specification as that of the water wall tube in the simulated scene based on the specification of the simulated actual water wall tube;

the specification of the frame is not particularly limited as long as it can stably support the tube bank.

A clamp is arranged at the free end of the branch pipe formed after the branch pipe is cut;

in this embodiment, anchor clamps include elastic ring and at least three clamping jaw, and the clamping jaw is along the hoop evenly connected elastic ring outer lane, and the elastic ring can overlap and establish on the branch pipe, and the clamping jaw stretches out and forms the clamping part outside the branch pipe.

In other embodiments, the clamp may also adopt other structures, for example, the clamp includes a semicircular tube and a lead screw nut mechanism, the semicircular tube is attached to the side wall of the branch tube and extends out of the end portion of the branch tube, a nut of the lead screw nut mechanism is mounted on a fixed block located in the branch tube, the lead screw is matched with the nut, and one end of the lead screw and a section of the semicircular tube extending out of the end portion of the branch tube form a clamping space;

in the embodiment, two steel pipes are cut to form a cutting area, a simulated welding operation space is established, and the simulated welding operation is carried out on the butt joint pipes in a matching manner;

specifically, a steel pipe with the length of 250mm is cut upwards at the position 400mm from the lower part to the upper part of the 4 th pipe on the left side, the mouth of the upper steel pipe and the lower steel pipe are leveled after the steel pipe is cut off, and a semicircular pipe is buckled on the back surface of the upper end of the steel pipe and is welded;

welding a nut at one end of an iron block with the thickness of 50 multiplied by 20 multiplied by 12mm, then welding the iron block at the center of the upper surface of the steel pipe, matching the nut with a lead screw to form a lead screw nut structure, and adjusting the relative position of the nut and the lead screw by rotating so as to adjust the size of a clamping space for fixing a butt joint pipe;

cutting a 250mm steel pipe downwards at a position 400mm from top to bottom of the 4 th pipe on the right side, flattening the mouth of the upper and lower steel pipes after cutting, and buckling a semicircular pipe on the back of the upper end of the steel pipe for welding;

the nut is welded at one end of a 50X 20X 12mm iron block, then the iron block is welded at the center of the upper surface of the steel pipe, the nut is matched with a lead screw to form a lead screw nut structure, and the relative position of the nut and the lead screw is adjusted through rotation, so that the size of a clamping space is adjusted and the nut is used for fixing the butt joint pipe.

The first tube bank is adopted to simulate an actual water wall tube, the branch tubes are cut to form a cutting part, replaceable butt tubes are configured to carry out simulation operation, the branch tubes on two sides of the butt tubes simulate the water wall tubes on two sides of a welding position in an actual scene, and the operation is trained when barrier tubes are arranged on two sides of the welding position in the actual scene, so that the proficiency of welding the water wall tubes is improved.

It can be understood that different clamps can be configured in the cutting area according to different butting conditions, the clamp can be configured on one section of steel pipe, or the clamps can be configured on two opposite sections of steel pipes to respectively clamp the butting pipes, so that a state simulating the butting of the water wall pipes is formed.

One end of the revolute pair is connected with the first pipe row, the other end of the revolute pair is connected with the rack, the first pipe row rotates relative to the rack through the revolute pair and is used for changing the included angle between the axis of the branch pipe and the horizontal plane, and the revolute pair is matched with a locking mechanism and is used for locking or unlocking the relative included angle between the revolute pair and the rack;

specifically, for the manufacturing of the revolute pair, in this embodiment, the revolute pair is formed by using sleeved steel pipes, two steel pipes with the diameter of phi 60 × 5 × 8mm are respectively repaired into a tee joint, and then one side of the tee joint is welded at the center position of two sides of the assembled water wall (the center of the water wall with the thickness of 850 mm) and the height of the two sides of the assembled water wall is the same, so as to be repaired into a rotating shaft;

a steel pipe with the diameter of 158 multiplied by 8 multiplied by 1500mm is erected at the center position of a channel steel with the diameter of 200 multiplied by 8 multiplied by 1500mm for welding, two steel pipes with the diameter of 76 multiplied by 6 multiplied by 10mm are respectively repaired into a tee joint and are welded at the position with the height of 900mm with the diameter of 158 multiplied by 8 multiplied by 1500mm (the left and right are fixed the same), and the center and the right side (90 degrees) above the two steel pipes with the diameter of 76 multiplied by 6 multiplied by 10mm are respectively rotated with the diameter of 14mm, and are welded on the hole by a.

When assembling the working frame, assembling: the welding fixture is characterized in that a steel pipe with the diameter of 159 multiplied by 8 multiplied by 150mm is welded on a frame with the diameter of 200 multiplied by 8 multiplied by 1500mm to be erected, steel pipes with the diameter of 76 multiplied by 6 multiplied by 10mm are welded on the left and the right, the steel pipes with the diameter of 76 multiplied by 6 multiplied by 10mm are horizontally aligned inwards, rotating shafts on two sides of the center of the water wall are inserted into the pipes with the diameter of 76 multiplied by 6 multiplied by 10mm, the steel channels with the diameter of 150 multiplied by 6 multiplied by 1050mm are welded on the center of the steel channels (200 multiplied by 8 multiplied by;

when the welding vertical fixation welds, weld the water-cooling wall upright, when the welding horizontal fixation welds, lay the water-cooling wall flat, fixed both sides screw, accomplished the horizontal fixation.

It will of course be appreciated that the second bank is similar in construction to the first bank and as shown differs from the second bank in that the direction of the axes of the legs of the second bank is perpendicular to the direction of the axes of the legs of the first bank;

therefore, when the device is used, the trend of the branch pipe can be adjusted by rotating the pipe row structure, so that the mode of welding operation is adjusted, and the simulation training of various pipe row arrangement modes is facilitated.

The condition that training exercise and actual site work are inconsistent is solved, the welding of two positions can be adjusted according to the welding condition to new work frame, and horizontal fixed welding and vertical fixed welding are promptly guaranteed welding quality, improve welding work efficiency.

Example 2

In another exemplary embodiment of the application, as shown in fig. 1 to 11, a simulated welding working method for a water-cooled wall of a training boiler is provided, the welding method adopts a combined welding method of backing electrode arc welding and filling cap surface by manual argon tungsten-arc welding, according to relevant examination rules, after the combined welding is completed, a single manual argon tungsten-arc welding and single electrode arc welding can be replaced, two welding operations can be learned, and after one examination is passed, the qualifications of the two welding operations can be obtained, so that after the combined welding examination, the welding skill application range of a welder is wider, and the cost is saved for the welder examination.

Utilizing the training boiler water wall tube simulated welding work frame as described in example 1, comprising the steps of:

adjusting the relative position of the tube bank structure and the rack to enable the branch tubes of the tube bank structure to be in the vertical direction or the horizontal direction and locked, and respectively processing grooves at the butt joint ends of the two butt joint tubes; the length of the butt joint pipe is adapted to the size of a space at a cutting position, the grooves of the two butt joint pipes are opposite, and the axes of the grooves are collinear;

matching the non-bevel end of one butt joint pipe with a clamp on one section of branch pipe corresponding to the cutting position, coaxially clamping, matching the non-bevel end of the other butt joint pipe with a clamp on the other section of branch pipe corresponding to the cutting position, coaxially clamping, adjusting the groove positions of the two butt joint pipes, and applying tack welding;

applying single-layer single-pass backing welding, adopting a left welding method and welding along the clockwise direction, performing segmented argon arc welding along the annular direction, and forming a continuous closed welding line by bypassing the barrier pipe in the welding process;

applying single-pass filling layer welding on the basis of the backing weld, adopting a right-hand welding method and welding along the anticlockwise direction, carrying out segmented arc welding along the annular direction, and forming a continuous closed weld seam by bypassing the barrier pipe in the welding process;

and (4) applying cover surface welding, applying single-layer two-pass welding, and adopting a right-hand welding method and welding along the anticlockwise direction. And each welding is subjected to segmented arc welding along the annular direction, and a continuous closed welding seam is formed by bypassing the barrier pipe in the welding process.

In this embodiment, the welding process is described in detail with reference to the accompanying drawings:

1. preparation before welding

Steel grade: 20, specification phi 60 multiplied by 5 multiplied by 100mm, 2;

welding material grade and specification: welding wire TIG-J50, phi 2.5 mm; welding rod E5015, phi 2.5 mm; a tungsten electrode WCe-20 mm, 2.5mm in diameter, and the shape and size of the ground part before use are as shown in figure 1;

groove type: butting the V-shaped grooves, wherein the angle of the groove is 60 +/-2 degrees, as shown in figure 2;

welding positions: vertically fixing;

the welding material ensures no rust and oil stain; and grinding the groove of the test piece and the two sides of the inner wall and the outer wall within the range of 10mm to obtain metallic luster.

The welding rod is baked for two hours at 300-350 ℃ in a drying box before use, and is taken out and then put into a heat-preserving barrel at 100 ℃ for use.

Welding equipment: ZX 7-400.

2. Butt welding with fixed position

In the cutting position of a welding working frame, two pipes with the diameter of 60 multiplied by 5 multiplied by 100mm are respectively butted above and below the cutting position, the groove of the upper pipe faces downwards, the groove of the lower pipe faces upwards, the butt gap between the two pipes is about 2.5mm, a welding rod is placed right and right, and then a screw rod is screwed down to respectively fix the pipes.

And (3) directly fixing any position in a groove of manual Gas Tungsten Arc Welding (GTAW), positioning one point, wherein the length of the positioning point is 10-20 mm, as shown in figure 3, and polishing the positioning welding point to ensure that a joint is good, and a welding line cannot have shrinkage cavities or other welding defects. The welding specification parameters are as follows:

3. root layer backing welding

Manual tungsten argon arc welding (GTAW) was used. The welding bead is single-layer single-pass welding. The welding direction is left welding.

Striking is performed by scratching (contact striking). As shown in fig. 4, arc striking is performed from the 9-point position, welding is performed in the clockwise direction, and arc striking is performed until the 3-point position, and welding is stopped. And (4) bypassing the barrier pipe, starting arc from the position 1cm in front of the 3 points, connecting the original 3 arc-closing points, welding until the position of 9 points is well fused with the original arc-closing points, closing the arc, and stopping welding.

The thickness of the root layer welding seam is controlled to be about 2 mm.

The method comprises the following specific operations: scratching, arcing, preheating an initial welding point to a molten state, adding wires to swing in a zigzag manner, and observing the good melting condition of a molten pool at any time. The angle between the welding wire and the workpiece and the welding gun is shown in figure 5.

The jointing method comprises the following steps: preheating the original welding line to a melting state, slowly filling the welding wire into a melting hole, and performing sawtooth swing; the jointing method comprises the following steps: when the welding is carried out to the position which is about 1mm away from the arc-closing position, the original welding seam is preheated until the welding seam is melted, and then the welding wire is slowly added into a melting hole to carry out sawtooth-shaped swing;

the arc-closing method comprises the following steps: after the arc-closing joint is finished, the welding gun pulls the electric arc to the edge of the groove from slow to fast to close the arc, thereby preventing the generation of shrinkage cavity.

The welding parameters were as follows:

4. intermediate filler layer welding

The welding method is Shielded Metal Arc Welding (SMAW). The welding bead is single-layer single-pass welding. The welding direction adopts a right-hand welding method for short-arc continuous welding.

The angle of the welding rod is shown in the attached figure 7, the middle layer is divided into two parts and is shown in the attached figure 8, arc welding is introduced at the 9 point to the 3 point for arc closing, after the welding rod bypasses the barrier tube, arc starting is carried out from about 1cm before the 3 point, welding is started after the original arc closing point is connected, and after the 9 point and the starting welding point are well fused, the arc closing is stopped for welding.

The swing mode of the welding rod is zigzag swing in the welding process, the length of an electric arc is 3-5 mm, the welding rod is scratched in a welding bead during arc striking, the arc is swung zigzag after being stably combusted, the arc is struck at the position 1cm away from the front end of an arc pit of the last welding receiving arc during welding of a joint, the arc is quickly pulled to the arc pit after being stably combusted, and the arc pit is filled with the arc, and then the welding rod is normally welded in zigzag swing, and the welding process is shown in the attached figure 8; and when the arc-closing joint is in arc-closing, after the arc-starting part of the last welding is completely melted, the molten iron is pulled to the upper part of the welding line to close the arc.

The welding parameters were as follows:

5. and (3) welding a cover layer:

the welding method is Shielded Metal Arc Welding (SMAW). The welding bead is a single-layer two-pass welding. The welding direction adopts a right-hand welding method for short-arc continuous welding.

The angles and the arrangement method of the welding rods are shown in figures 9 and 10. The weld of the cover surface layer is divided into two weld seams, each weld seam is completed in two parts, and the position of the two weld seams is schematically shown in figure 10.

A first welding seam:

first, the electrode is started from the pipe obstruction to ensure proper electrode dip and arc length. The arc conveying mode is sawtooth-shaped uniform-speed swing, the welding rod forms 70-80 degrees with the tangent line of the pipe fitting from beginning to end, in the first welding seam welding process, the arc swings downwards until the edge of the descending notch slightly stays, the groove is filled up and the arc swings upwards until the height of two thirds of the section of the filled welding seam is proper, and the welding seam is welded to the arc-closing point to close the arc;

secondly, the welding gun starts arc welding from an arc-closing point to an arc-starting point, when the welding rod is connected, the welding rod starts arc at a position 1cm away from an arc pit, the arc is quickly pulled to the arc pit to be filled after the arc is stably combusted, sawtooth swing is carried out (the welding method and the requirements are the same as above), when the arc-starting position of the last welding is completely melted, molten iron is pulled to the upper part of a welding line to be closed.

And (3) second welding seam:

in the second welding seam welding process, the electric arc swings upwards to slightly stay at the edge of the upper groove to fill the groove and swings downwards to the highest point of the first welding seam section of the cover surface layer. Welding parameters, operating parameters and joint methods are equivalent to the first weld.

The welding parameters were as follows:

and rotating the turntable of the working frame to enable the transverse support to be parallel to the ground, and completing the welding operation at the other position according to the operation.

The cutting parts are positioned at different axial positions of the branch pipe, different welding positions and welding height scenes in an actual scene are simulated, and an operation scene of the actual scene can be simulated by matching with the working frame which can rotate to change the direction of the branch pipe, so that the actual training requirement is met;

the electric arc welding operation is adopted for the scenes that the middle filling layer and the cover surface layer do not need to be subjected to shielded welding, compared with the existing argon arc welding operation, the method can meet the quality requirement of the bottom welding seam at the root part, reduces the operation difficulty of the segmented welding on the basis of ensuring that the strength and the tightness of the welding seam meet the requirements, improves the labor efficiency, reduces the production cost, and is popularized and applied in the field welding of the power station.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a training is with boiler water wall pipe simulation welding work frame, a serial communication port, including continuous first bank of tubes and second bank of tubes, first bank of tubes includes first branch pipe and the first support of rectangle frame-type, many first branch pipes interval in proper order and parallel arrangement are in first support, the second bank of tubes includes second branch pipe and rectangle frame-type second support, many second branch pipes interval in proper order and parallel arrangement are in the second support, first branch pipe and second branch pipe axis are perpendicular and coplane, at least one first branch pipe and at least one second branch pipe cut, every branch pipe that cuts all forms two sections that the interval set up, first bank of tubes and second bank of tubes rotate jointly and install in the frame.

2. The simulated welding work frame for the water wall tubes of the training boiler as claimed in claim 1, wherein one end of the first branch tube is connected with one frame of the first support, the other end of the first branch tube is connected with the other frame of the first support, and the first branch tubes connected with the first support are arranged at equal intervals.

3. The simulated welding work frame for the water wall pipe of the training boiler as claimed in claim 1, wherein one end of the second branch pipe is connected with one frame of the second support, the other end of the second branch pipe is connected with the other frame of the second support, and the second branch pipes connected with the second support are arranged at equal intervals.

4. The simulated welding work frame for the water wall tube of the training boiler as recited in claim 1, wherein one frame of the first support is shared with one frame of the second support, and the first support and the second support are arranged in a coplanar manner.

5. The simulated welding work frame for the water wall pipe of the training boiler as claimed in claim 1, wherein a clamp is mounted at a free end of a branch pipe formed by cutting the first branch pipe and the second branch pipe.

6. The simulated welding workbench for the water wall pipe of the training boiler as recited in claim 5, wherein said fixture comprises an elastic ring and at least three clamping jaws, the clamping jaws are uniformly connected with the outer ring of the elastic ring along the circumferential direction, the elastic ring can be sleeved on the branch pipe, and the clamping jaws extend out of the branch pipe to form a clamping part.

7. The simulated welding worktable for water wall tubes of a training boiler as claimed in claim 1, wherein the two ends of the connecting position of the first tube bank and the second tube bank are respectively connected with the frame through revolute pairs, and the rotation axes of the two revolute pairs are arranged in a collinear manner.

8. The simulated welding work frame for the water wall tube of the training boiler as recited in claim 7, wherein the frame comprises two opposite support rods, one support rod is connected with one rotating pair to form a rotating connection, and the other support rod is connected with the other rotating pair to form a rotating connection.

9. The simulated welding work frame for the water wall pipe of the training boiler as recited in claim 8, wherein the side of the supporting rod is connected with a rotating pair, and the bottom end of the supporting rod is connected with a base.

10. The simulated welding workbench for water wall tubes of training boilers as claimed in any one of claims 7-9, wherein said revolute pair is fitted with a locking mechanism for locking or unlocking the relative angle of tube row and frame.