阅读说明：本技术 一种管状结构端部过渡层堆焊焊接方法 (Surfacing welding method for transition layer at end part of tubular structure ) 是由 王刚 于杰 陈曦 康胜 晏桂珍 李英杰 于 2021-09-16 设计创作，主要内容包括：本发明涉及一种管状结构端部过渡层堆焊焊接方法,在待堆焊的管状结构端部内侧面固定环状的垫板,垫板的一端与管状结构端部固定,另一端安装环板,管状结构和环板相对端面与垫板外侧面构成用于承托过渡层的空间,将管状结构水平设置并绕自身轴线转动,对管状结构端部进行堆焊形成过渡层,采用本发明的方法工作效率高,安全性好。(The invention relates to a surfacing welding method for a transition layer at the end part of a tubular structure, wherein an annular base plate is fixed on the inner side surface of the end part of the tubular structure to be surfaced welded, one end of the base plate is fixed with the end part of the tubular structure, a ring plate is arranged at the other end of the base plate, the opposite end surfaces of the tubular structure and the ring plate and the outer side surface of the base plate form a space for supporting the transition layer, the tubular structure is horizontally arranged and rotates around the axis of the tubular structure, and the end part of the tubular structure is surfaced to form the transition layer.)

1. The utility model provides a tubular structure tip transition layer build-up welding method which characterized in that, fixes annular backing plate at the tubular structure tip medial surface of treating the build-up welding, and the one end and the tubular structure end fixing of backing plate, other end installation crown plate, the relative terminal surface of tubular structure and crown plate and backing plate lateral surface constitute the space that is used for bearing the transition layer, set up the tubular structure level and revolve round self axis and rotate, build-up welding formation transition layer to the tubular structure tip.

2. The surfacing welding method for the end transition layer of the tubular structure according to claim 1, wherein the cross section of the backing plate is L-shaped and comprises a first backing plate part and a second backing plate part which are vertically arranged, one end of the first backing plate part is fixed with one end of the second backing plate part, the other end of the first backing plate part is fixed with the inner side surface of the end part of the seal head, and the other end of the second backing plate part can be fixed with the annular plate.

3. The surfacing welding method for the end transition layer of the tubular structure according to claim 2, wherein the length of the joint part of the second gasket part and the end of the tubular structure along the axial direction of the seal head is not less than 20 mm.

4. A method of weld-overlay of an end transition layer of a tubular structure according to claim 1, wherein the difference between the outside diameter and the inside diameter of the annular plate is greater than the wall thickness of the tubular structure.

5. A surfacing welding method for an end transition layer of a tubular structure according to claim 1, wherein the ring plate is sleeved on the periphery of the end of the backing plate and is welded and fixed with the backing plate.

6. The surfacing welding method for the transition layer at the end part of the tubular structure according to claim 1, wherein the backing plate is formed by integrally rolling steel plate strips or by rolling the steel plate strips in sections and then splicing the steel plate strips.

7. The surfacing welding method for the transition layer at the end part of the tubular structure according to claim 1, wherein the backing plate is welded and fixed with the inner side surface of the end part of the tubular structure by a positioning welding method.

8. The surfacing welding method for the transition layer at the end part of the tubular structure according to claim 1, wherein after the axis of the seal head is horizontally arranged, after the axis of the tubular structure is horizontally arranged, the tubular structure is placed on a roller of a roller frame, and the roller frame is used for driving the tubular structure to rotate around the axis of the tubular structure.

9. A method of weld-overlaying an end transition layer of a tubular structure according to claim 1, wherein the weld-overlaying is performed by submerged arc welding using a submerged arc welding apparatus.

10. A method of weld-overlay of an end transition layer of a tubular structure according to claim 1, wherein the tubular structure is preheated before the weld-overlay until the temperature of the tubular structure reaches a set temperature.

Technical Field

The invention relates to the technical field of welding, in particular to a surfacing welding method for a transition layer at the end part of a tubular structure.

Background

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

At present, part of industries need to weld a transition layer on the end part of a tubular structure in a surfacing mode, for example, a mechanical penetrating piece with an end socket of a nuclear power plant is a device penetrating through a steel containment and a shielding workshop, the sealing performance of the containment is guaranteed together with an expansion joint, the mechanical penetrating piece with the end socket of the nuclear power plant is of a tubular structure, the transition layer needs to be welded on the end socket side of the penetrating piece with the end socket of the nuclear power plant, the end socket 1 is vertically placed in a conventional surfacing mode, an inner backing plate 2 and an outer backing plate 2 (shown in figure 1) are adopted, manual welding rod arc welding is used for completing the surfacing welding, and no relevant welding experience exists in automatic welding equipment and submerged arc welding processes for reference. The inventor finds that when the conventional mode is adopted for surfacing, the welding period of a single piece is 5-6 days per person, the welding efficiency is low, the requirement on the skills of personnel is high, and the labor input cost is high; the seal head is positioned at a vertical position during surfacing, and potential safety hazards exist in the operation process; the inner backing plate and the outer backing plate are used, so that the machining workload is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a surfacing welding method for the end transition layer of the tubular structure, which has high welding efficiency and good safety.

In order to achieve the purpose, the invention adopts the following technical scheme:

the embodiment of the invention provides a surfacing welding method for a transition layer at the end part of a tubular structure.

Optionally, the cross-section of backing plate is the L type, including perpendicular first backing plate portion and the second backing plate portion that sets up, the one end of first backing plate portion is fixed with the one end of second backing plate portion, and the other end is fixed with tubular structure's tip medial surface, and the other end of second backing plate portion can be fixed with the crown plate.

Optionally, the length of the second pad part and the end part joint part of the tubular structure along the axis direction of the tubular structure is not less than 20 mm.

Optionally, the difference between the outer diameter and the inner diameter of the ring plate is greater than the wall thickness of the tubular structure.

Optionally, the ring plate is sleeved on the periphery of the end part of the backing plate and is welded and fixed with the backing plate.

Optionally, the base plate is formed by integrally rolling steel plate strips or formed by rolling steel plate strips in a segmented mode and then splicing the steel plate strips.

Optionally, the backing plate is welded and fixed to the inner side face of the end portion of the tubular structure by a tack welding method.

Optionally, after the axis of the tubular structure is horizontally arranged, the tubular structure is placed on a roller of a roller frame, and the roller frame is used for driving the tubular structure to rotate around the axis of the tubular structure.

Optionally, submerged arc surfacing is performed by submerged arc welding equipment for surfacing.

Optionally, before surfacing, preheating the tubular structure until the temperature of the tubular structure reaches a set temperature.

The beneficial effects of the invention are as follows:

1. according to the method, the base plate is arranged on the inner side face of the end part of the tubular structure, and the axis of the tubular structure is horizontally arranged for surfacing, so that compared with the conventional surfacing method for the end part of the tubular structure, the method saves the workload of installing and removing nearly half of the base plate, and the tubular structure is improved from vertical erection to horizontal rotation on the roller frame, so that the tubular structure is always in a safe flat welding position, and the safety risk in the operation process is effectively reduced.

2. According to the method, the roller carrier drives the tubular structure to rotate around the axis of the tubular structure, the base plate is matched, the application of the submerged arc automatic welding process in pipe end surfacing is realized, only one welding operator is needed, the welding efficiency is improved, and meanwhile, the requirement on the skills of the welding operator is reduced.

3. According to the method, the section of the base plate is in the L shape, so that the dilution of the base metal of the liner to the weld metal is reduced, the base plate can be completely removed on the basis of meeting the thickness requirement, and the quality of the weld is guaranteed.

4. According to the method, the ring plate is arranged at the end part of the base plate, so that the ray detection length can be compensated, the surfacing quantity is reduced, and the labor and material costs are saved.

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 view of a prior art seal end transition layer weld;

FIG. 2 is a schematic sectional view of a backing plate used in the welding method of embodiment 1 of the present invention;

FIG. 3 is a front view of a ring plate used in the welding method of embodiment 1 of the present invention;

FIG. 4 is a side view of a ring plate used in the welding method of embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of a method for welding a transition layer of a sealing end portion according to embodiment 1 of the present invention;

fig. 6 is a partial schematic view of a weld head end transition layer overlay welding according to embodiment 1 of the present invention;

the device comprises a shell, a base plate, a first cushion plate portion, a second cushion plate portion, a roller frame, a shell processing pipeline, a ring plate and a transition layer, wherein the shell comprises 1. an end enclosure, 2. the base plate, 2-1. the first cushion plate portion, 2-2. the second cushion plate portion, 3. the roller frame, 4. the end enclosure processing pipeline, 5. the ring plate and 6. the transition layer.

Detailed Description

Example 1

The embodiment provides an axial overlaying welding method for the end part of a tubular structure. The tubular structure is a seal head with a penetrating piece in the center and is used for surfacing the end face of the open end of the seal head, the penetrating piece is arranged in the center of the seal head, and the penetrating piece is a seal head process pipeline.

The equipment and accessories used in the embodiment comprise a roller carrier 3, the roller carrier is matched with a seal head process pipeline 4, and the seal head process pipeline can be placed between rollers on two sides of the roller carrier and used for supporting the seal head and the seal head process pipeline and driving the seal head to rotate around the axis of the seal head process pipeline.

The roller frame drives the circular weldment to rotate by means of the friction force between the weldment and the driving roller so as to complete the welding of the annular welding seam. The welding speed can be adjusted by the rotating speed of the driving roller on the roller frame. The rollers should be always kept on the same axis, so that the workpiece is not easy to deform and slip when rotating.

The used tool further comprises a backing plate 2, as shown in fig. 2, the backing plate is of an annular structure and can be fixed on the inner side surface of the open end of the seal head.

Furthermore, in order to reduce the dilution of the base material of the gasket on the weld metal and ensure that the base material of the base plate can be completely removed on the basis of meeting the thickness requirement, the quality of the weld is ensured, steps are formed on the groove side of the base plate, namely the cross section of the base plate is in an L shape, the base plate comprises a first base plate part 2-1 and a second base plate part 2-2 which are vertically arranged, the first base plate part is integrally connected with one end of the second base plate part, and the other end of the first base plate part can be fixed with the inner side surface of the end sealing part.

In the embodiment, the backing plate is made of a lath, in one embodiment, a lath with a set width is cut on a steel plate with a set thickness, and further, in order to ensure the bearing capacity of the backing plate on the weld metal, the thickness T1 of the steel plate is not less than 20mm, and the width L2 of the lath is not less than 80 mm. The size of the backing plate can be set by those skilled in the art according to actual needs.

The step with the set depth H is milled by machining, the set depth is not less than 3mm, a section of length which is fixedly attached to the inner wall of the seal head is reserved, and the length L1 is not less than 20mm in order to guarantee the fixing strength of the cushion plate and the seal head.

After the lath is processed, the lath is integrally rolled into a circular base plate by using a plate rolling machine, and in another embodiment, after the lath is processed, the base plate is formed by adopting a sectional rolling and splicing mode.

Further, in order to reduce the length of the overlay welding layer increased by the radiographic inspection, the used fitting further comprises a ring plate 5, as shown in fig. 3-4, the ring plate is in a ring structure and can be sleeved on the periphery of the second pad portion, and the inner side surface of the ring plate is in contact with the outer side surface of the second pad portion and is welded and fixed.

And determining the inner diameter dimension PhiD of the annular plate according to the outer diameter dimension of the second cushion plate part, wherein the processing method comprises the step of cutting a steel plate with a set thickness for shift change from the steel plate with the set thickness, the thickness W of the steel plate is not less than 25mm, the connection strength between the steel plate and the cushion plate is ensured, and the difference S between the outer diameter and the inner diameter of the annular plate is greater than the wall thickness of the seal head.

The used equipment also comprises a submerged arc welding machine which can realize automatic submerged arc surfacing.

As shown in fig. 5 to 6, the overlay welding method includes the steps of:

step 1: the seal head 1 is hung on the roller carrier by using hoisting equipment, so that the rollers on the two sides of the roller carrier support the seal head process pipeline of the seal head, and the gravity centers of the seal head and the seal head process pipeline 4 are positioned in the middle of the rollers on the two sides of the roller carrier, thereby ensuring that the seal head rotates stably around the axis of the seal head during the welding process and ensuring the welding quality.

The seal head is improved from vertical erection to horizontal rotation on the roller carrier, so that the seal head is always in a safe flat welding position, and the safety risk in the operation process is effectively reduced.

Step 2: the end part of the first cushion plate part of the cushion plate is fixed on the inner side surface of the end part of the opening end of the seal head, so that the fixing is convenient, the time is saved, and the cushion plate and the inner side surface of the end part of the seal head are fixed by adopting a positioning welding method. After the backing plate is fixed at the inside surface of the end part of the sealing head, the backing plate is sleeved on the periphery of the end part of the second backing plate and clamped and fixed.

And by adopting the inner single-side base plate, compared with the conventional surfacing mode, the mounting and removing workload of nearly half of the base plate is saved.

And step 3: adjusting the position of the submerged arc welding machine, rotating the roller carrier, determining the position of a lens of the submerged arc welding machine and the welding track, and preheating the end socket by using an electric heating or flame preheating method through the outer side surface of the end socket, so that the temperature of the end socket reaches the set temperature, and the requirements of WPS (welding process procedures) are met.

And 4, step 4: the roller carrier drives the seal head to rotate around the axis of the roller carrier, the submerged arc welding machine starts arc to carry out submerged arc surfacing, the maximum inter-channel temperature is controlled to finish subsequent welding work, and weld metal is utilized to form a transition layer 6 in the space between the outer side surface of the base plate, the seal head and the opposite end surface of the ring plate. The submerged arc surfacing method is adopted, so that the welding quality is stable, the welding productivity is high, and no arc light and little smoke dust exist.

It is understood that other types of weld overlay methods may be used by those skilled in the art to weld the transition layer.

The method of the embodiment realizes the application of the submerged arc automatic welding process in pipe end surfacing, only one welding operator is needed, the welding efficiency is improved, and meanwhile, the requirement on the skills of the welder is reduced.

After the end socket surfacing is finished, the end socket which is subjected to the transition layer surfacing is taken down from the roller carrier, local postweld heat treatment is carried out, the backing plate is removed, the ring plate and weld metal are integrated during surfacing and retained, then 100% RT (reverse transcription) detection is carried out on the transition layer, and the qualified rate is 100%.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.