CN112372109B

CN112372109B - Simulation welding working frame and method for water wall tube of boiler for training

Info

Publication number: CN112372109B
Application number: CN202011086345.5A
Authority: CN
Inventors: 王志红; 刘群; 赵进忠; 刘松善; 周桂萍; 韩旸
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: 2020-10-12
Filing date: 2020-10-12
Publication date: 2022-08-05
Anticipated expiration: 2040-10-12
Also published as: CN112372109A

Abstract

The invention provides a simulation welding working frame and a simulation welding working method for water wall tubes of a boiler for training, which relate to the field of welding teaching aids and comprise a tube bank structure formed by a plurality of branch tubes which are sequentially arranged at intervals, wherein a first branch tube and a last branch tube of the tube bank structure are respectively connected with a frame through revolute pairs, in the branch tube between the first branch tube and the last branch tube, at least one branch pipe is cut, the cut branch pipe forms two sections which are arranged at intervals, the end part of the branch pipe corresponding to the cutting position is provided with a clamp, a working frame special for simulation welding of the water wall pipe is built, the angle of the position to be operated can be adjusted, the cutting position is arranged, the clamp is arranged to clamp a butt joint pipe for simulation welding, through the actual welding scene of centre gripping butt joint pipe simulation, only need change the butt joint pipe alright reach reuse work frame and carry out the operation of repeated water wall pipe simulated welding, operation proficiency when effectively improving the welding water wall pipe.

Description

Simulation welding working frame and method for water wall tube of boiler for training

Technical Field

The disclosure relates to the field of welding teaching aids, in particular to a simulated welding working frame and a simulated welding working method 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 utility model discloses an aim at the defect that prior art exists, a boiler water wall pipe simulation welding work frame and method for training is provided, build and be exclusively used in water wall pipe simulation welding's work frame, can adjust the angle of treating the operating position, 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 reach and carry out the operation of repetition water wall pipe simulation welding with reaching reuse work frame, operation proficiency when effectively improving the welding water wall pipe.

The first purpose of the present disclosure is to provide a simulation welding work frame for training boiler water wall tubes, which adopts the following technical scheme:

the pipe-row structure formed by a plurality of branch pipes arranged at intervals in sequence is included, a first branch pipe and a last branch pipe of the pipe-row structure are respectively connected with the rack through revolute pairs, at least one branch pipe is cut in the branch pipe between the first branch pipe and the last branch pipe, the cut branch pipe forms two sections arranged at intervals, and a clamp is arranged at the end part of the branch pipe corresponding to the cutting position.

Furthermore, the two ends of the branch pipes are aligned, one end of each branch pipe is connected with the same support plate, the other end of each branch pipe is connected with the other support plate, and a pipe row structure is formed jointly.

Furthermore, an uncut branch pipe is arranged between two adjacent cutting positions at intervals, and the cutting parts are respectively positioned at different axial positions of the branch pipe.

Further, the fixture comprises a semicircular pipe and a lead screw nut mechanism, the semicircular pipe is attached to the side wall of the branch pipe and extends out of the end portion of the branch pipe, a nut of the lead screw nut mechanism is installed on a fixing block located in the branch pipe, a lead screw is matched with the nut, and one end of the lead screw and one section of the semicircular pipe extending out of the end portion of the branch pipe form a clamping space.

Furthermore, a pipe array structure is connected to one end of the revolute pair, the other end of the revolute pair is connected with the rack, the pipe array structure rotates relative to the rack through the revolute pair and is used for changing an 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.

The second purpose of the present disclosure is to provide a simulated welding method for water wall tubes of a training boiler, which utilizes the simulated welding work frame for water wall tubes of a training boiler as described above, and comprises the following steps:

adjusting the relative position of the tube bank structure and the frame, and processing grooves on the butt ends of the two butt pipes respectively;

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 backing welding, 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 a filling layer for welding on the basis of the backing weld, performing segmented arc welding along the annular direction, and forming a continuous closed weld by bypassing the barrier pipe in the welding process;

and (3) applying cover surface welding, applying single-layer two-pass welding, performing segmented arc welding along the annular direction for each pass of welding, and forming a continuous closed welding seam by bypassing the barrier pipe in the welding process.

Further, the relative position of the tube bank structure and the frame is adjusted so that the branch tubes of the tube bank structure are in a vertical direction or a horizontal direction and locked, and the welding process is applied.

Furthermore, the length of the butt joint pipe is adapted to the space size at the cutting position, the grooves of the two butt joint pipes are opposite, and the axes of the two butt joint pipes are collinear.

Further, single-layer single-pass backing welding is applied, and a left welding method is adopted and welding is carried out along the clockwise direction; applying single-layer single-pass filling welding, adopting a right-hand welding method and welding along the counterclockwise direction; and (4) applying cover surface welding, and adopting a right-hand welding method to weld along the anticlockwise direction.

Further, after the cover surface is welded, the tube bank structure is rotated, the vertically arranged tube bank is adjusted to be in a horizontal state, and butt joint tube welding at the next cutting position is carried out.

Compared with the prior art, the utility model 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 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 the 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 included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.

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

embodiments

1 and 2 of the present disclosure;

fig. 2 is a schematic structural view of a pipe joint at a pipe joint groove in

embodiments

1 and 2 of the present disclosure;

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

embodiments

1 and 2 of the present disclosure;

FIG. 4 is a sectional welding schematic diagram of backing welding in the

embodiments

1 and 2 of the present disclosure;

FIG. 5 is a schematic illustration of the relative positions of the welding wire, workpiece and welding gun in

embodiments

1, 2 of the disclosure;

FIG. 6 is a schematic sectional weld view of a fill weld in

embodiments

1, 2 of the present disclosure;

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

embodiments

1 and 2 of the disclosure;

fig. 8 is a schematic diagram of relative positions of a welding structure and an arc ignition point in

embodiments

1 and 2 of the present disclosure;

FIG. 9 is a schematic welding diagram of a cover welding in

embodiments

1 and 2 of the present disclosure;

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 disclosure;

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

embodiments

1 and 2 of the present disclosure.

Wherein: 1. column, 2, tube bank structure, 3, revolute pair, 4, base.

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 disclosure 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 disclosure. As used herein, the singular forms "a", "an", and "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 disclosure, 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 the present disclosure.

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 disclosure provides a simulation welding working frame and a simulation welding working method for a water wall tube of a boiler for training.

Example 1

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

The working frame comprises a frame, a tube bank structure 2 and a revolute pair 3, the tube bank structure comprises a plurality of branch tubes which are sequentially arranged at intervals, a first branch tube and a last branch tube of the tube bank structure are respectively connected with the frame through the revolute pair, at least one branch tube is cut in the branch tubes between the first branch tube and the last branch tube, the cut branch tubes form two sections which are arranged at intervals, and clamps are arranged at the end parts of the branch tubes 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 pipe row structure;

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 for the manufacturing materials of the frame and the tube bank, other specifications can be selected, for example, the length, the diameter and the tube wall thickness of the branch tube are adjusted, and the same specification as that of the water wall tube in the simulated scene is selected to construct the tube bank structure 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.

The clamp comprises a semicircular pipe and a lead screw nut mechanism, the semicircular pipe is pasted on the side wall of the branch pipe and extends out of the end part of the branch pipe, a nut of the lead screw nut mechanism is arranged on a fixed block positioned in the branch pipe, a lead screw is matched with the nut, and one end of the lead screw and a section of the semicircular pipe extending out of the end part of the branch pipe 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 250mm steel pipe is cut upwards at a position 400mm from the bottom to the top of the 4 th pipe on the left side, the mouth of the upper steel pipe and the lower steel pipe are required to be flat after cutting, and a semicircular pipe is buckled on the back of the upper end of the steel pipe and 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 pipe row structure is adopted to simulate an actual water wall pipe, the branch pipes are cut to form cutting parts, replaceable butt joint pipes are configured to carry out simulation operation, the branch pipes on the two sides of the butt joint pipes simulate the water wall pipes on the two sides of a welding position in an actual scene, and the operation is trained when barrier pipes are arranged on the two sides of the welding position in the actual scene, so that the proficiency of welding the water wall pipes 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 pipe row structure, the other end of the revolute pair is connected with the rack, the pipe row structure rotates relative to the rack through the revolute pair and is used for changing an 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 nut.

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 1500mm) on two sides, and 90 degrees are formed with the steel channels on two sides, so that the water wall simulation welding fixture is formed;

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.

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 disclosure, as shown in fig. 1 to 11, a simulated welding 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 related examination rules, after the combined welding is completed, a single manual argon tungsten-arc welding and shielded electrode arc welding can be replaced, two welding operations can be learned, and after one examination, the qualification of the two welding operations can be obtained, so that after the combined welding examination, the application range of the welding skill 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;

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 is multiplied by 5 is multiplied by 100mm, 2;

welding material grade and specification: welding wire T IG-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.

The arc striking adopts scratch arc striking (contact arc striking). As shown in fig. 4, arc striking is performed from the 9 o 'clock position, welding is performed in the clockwise direction, and arc closing is performed until the 3 o' clock 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 the welding point to a molten state, adding the wire to swing in a zigzag manner, and observing the good melting condition of the 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 3-5mm, 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 positions of the two weld seams are 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 disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. The utility model provides a training is with boiler water wall pipe simulation welding work frame, a serial communication port, including the bank of tubes structure that many spinal branchs pipe that interval set up in proper order formed, the first spinal branch pipe of bank of tubes structure and last spinal branch pipe are respectively through revolute pair connection frame, in the branch pipe between first spinal branch pipe and the last spinal branch pipe, at least a spinal branch pipe cuts, the branch pipe after cutting forms two sections that the interval set up, the branch pipe tip that the position corresponds of cutting is equipped with anchor clamps, two adjacent cutting position intermediate intervals have the branch pipe that does not cut, and cut the part and be located the different axial position of branch pipe respectively, the training is with boiler water wall pipe simulation welding method and includes following content: adjusting the relative position of the tube bank structure and the frame, and processing grooves on the butt ends of the two butt pipes respectively; butt-jointing V-shaped grooves, wherein the angle of the grooves is 60 degrees +/-2 degrees,

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 backing welding, 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 a filling layer for welding on the basis of the backing weld, performing segmented arc welding along the annular direction, and forming a continuous closed weld by bypassing the barrier pipe in the welding process; the swing mode of the welding rod in the welding process is sawtooth swing, the arc length is 3-5mm, the welding speed is 125-135mm/min,

applying cover welding, applying single-layer two-pass welding, wherein the cover welding line is divided into two welding lines, namely a first welding line:

the welding rod starts an arc from the obstacle of the pipe fitting to ensure a proper welding rod inclination angle and arc length, the arc conveying mode is that the welding rod swings at a constant speed in a sawtooth shape, the welding rod forms 70-80 degrees with the tangent line of the pipe fitting all the time, in the first welding seam welding process, the arc swings downwards until the edge of a descending notch slightly stays to fill the groove and upwards, then swings to the height of two thirds of the section of a filling welding seam, and the welding seam is welded to an arc closing point to close the arc;

the welding gun starts arc welding from an arc-closing point to an arc-starting point, when in joint, a welding rod starts arc at a position 1cm away from an arc pit, quickly pulls the arc pit to fill the arc pit after the arc is stably combusted, and swings in a sawtooth manner; when the arc-closing joint is in arc-closing, the molten iron is drawn to the upper part of the welding line to close the arc after the arc-starting position of the last welding is completely melted,

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, the welding speed is 175 plus 185mm/min, each welding process is performed with segmented electric arc welding along the annular direction, and a continuous closed welding seam is formed by bypassing the obstacle pipe in the welding process.

2. The simulated welding work frame for the water wall tubes of the training boiler as claimed in claim 1, wherein the two ends of the branch tubes are aligned, one end of each branch tube is connected with the same support plate, and the other end of each branch tube is connected with the other support plate, so that the two support plates form a tube bank structure together.

3. The simulated welding worktable for water wall pipes of training boilers as claimed in claim 1, wherein the jig comprises a semicircular pipe and a lead screw and nut mechanism, the semicircular pipe is attached to the side wall of the branch pipe and extends out of the end portion of the branch pipe, a nut of the lead screw and nut mechanism is mounted on a fixed block located in the branch pipe, the lead screw is engaged with the nut, and one end of the lead screw and a section of the semicircular pipe extending out of the end portion of the branch pipe form a clamping space.

4. The simulated welding workbench for water wall tubes of training boilers as claimed in claim 1, wherein one end of said revolute pair is connected to the tube bank structure, and the other end is connected to the frame, the tube bank structure is rotated relative to the frame by the revolute pair for changing the angle between the axis of the branch tube and the horizontal plane, and the revolute pair is fitted with a locking mechanism for locking or unlocking the relative angle between the revolute pair and the frame.

5. The simulated welding work frame for water wall tubes of training boilers as claimed in claim 1, wherein the relative position of the tube bank structure and the frame is adjusted so that the branch tubes of the tube bank structure are in a vertical direction or a horizontal direction and locked to apply the welding process.

6. The simulated welding work frame for the water wall pipes of the training boiler as recited in claim 1, wherein the length of the butt joint pipes is adapted to the size of the space at the cutting position, the grooves of the two butt joint pipes are opposite, and the axes of the two butt joint pipes are collinear.

7. The simulated welding work frame for the water wall pipes of the training boiler as recited in claim 1, wherein a single layer single pass backing weld is applied, and the welding is performed in a left side welding method and in a clockwise direction; applying single-layer single-pass filling welding, adopting a right-hand welding method and welding along the counterclockwise direction; and (4) applying cover surface welding, and adopting a right-hand welding method to weld along the anticlockwise direction.

8. The simulated welding work frame for the water wall tubes of the training boiler as recited in claim 1, wherein after the cover surface is welded, the tube bank structure is rotated to adjust the vertically arranged tube bank to a horizontal state, and butt-joint tube welding at the next cutting position is performed.