阅读说明：本技术 一种电子束焊接返修喷注器的方法 (Method for repairing injector by electron beam welding ) 是由 王英杰 胡海刚 王未有 张勤练 薄佑锋 李双吉 于 2021-06-30 设计创作，主要内容包括：本发明涉及一种电子束焊接返修喷注器的方法,步骤包括：(1)确认喷注器的喷嘴和中底钎焊缝气密试验出现渗漏的位置,并核实钎焊缝出现渗漏的喷嘴数量,加工相应数量的铜环；(2)在钎焊缝存在渗漏的喷嘴与中底连接部位加工出环槽；(3)采用真空电子束焊的方式对中铜环进行焊接,以通过熔化的铜环连接喷嘴和中底；(4)对电子束焊接返修后的喷注器进行气密试验检查,检查中底和喷嘴焊缝是否存在渗漏。采用本发明的技术返修气密试验渗漏的钎焊缝合格率达97％以上。(The invention relates to a method for repairing an injector by electron beam welding, which comprises the following steps: (1) confirming the position of leakage in an air-tight test of a nozzle of an injector and a middle sole brazing seam, checking the number of the nozzles with leakage in the brazing seam, and processing copper rings with corresponding number; (2) processing a ring groove at the connection part of the nozzle with leakage in the brazing seam and the middle sole; (3) welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the insole through the melted copper ring; (4) and (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and checking whether the welding seam of the insole and the nozzle leaks or not. The qualification rate of the leaked brazing seam of the air-tight test repaired by adopting the technology of the invention reaches more than 97 percent.)

1. A method of electron beam welding rework of an injector, comprising the steps of:

(1) confirming the position of leakage in an air-tight test of a nozzle of an injector and a middle sole brazing seam, checking the number of the nozzles with leakage in the brazing seam, and processing copper rings with corresponding number;

(2) processing a ring groove at the connection part of the nozzle with leakage in the brazing seam and the middle sole;

(3) welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the insole through the melted copper ring;

(4) and (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and checking whether the welding seam of the insole and the nozzle leaks or not.

2. The method of electron beam welding rework of injectors of claim 1,the diameter of the injector in the step (1) isThe number of nozzles isAnd (4) respectively.

3. An electron beam welding repair injector method according to claim 1, wherein the material of the bottom of the injector is stainless steel and the material of the nozzle is chrome bronze or red copper.

4. The electron beam welding repair injector method according to claim 1, wherein the copper ring in step (1) has an axial length ofRadial width of copper ring The copper ring material is chromium bronze or red copper.

5. The method for repairing the injector by electron beam welding as claimed in claim 1, wherein the size of the ring groove in the step (2) is matched with that of the copper ring, so that after the copper ring is placed in the ring groove, the butt joint clearance and the dislocation between the copper ring and the middle sole and between the copper ring and the nozzle are not more than 0.1 mm.

6. The electron beam welding repair injector method according to claim 1, wherein the distance b of the electron beam welding position from the inner surface of the copper ring in the step (3) is set to be equal to

7. The method for electron beam welding rework of injector as claimed in claim 1, wherein in step (3) the electron beam current is

8. The method of electron beam welding rework injector of claim 7, wherein the focusing current isThe acceleration voltage was 60 KV.

9. The electron beam welding repair injector method according to claim 1, wherein the gas tightness test pressure in the step (4) is

10. The method for electron beam welding rework of injectors as claimed in claim 1, wherein the welding speed in the step (3) is a speed of welding

Technical Field

The invention relates to a method for repairing an injector by electron beam welding, in particular to a method for repairing an injector by adopting a vacuum electron beam welding mode.

Background

In the past, if leakage occurs in an airtight test of a soldering seam between a midsole and a nozzle of the injector, the leakage is repaired by adopting a repeated soldering mode, but after repeated soldering, the probability of the leakage part of the soldering seam between the midsole and the nozzle is high, and the repair cost of the repeated soldering is high. If after repeated brazing, leakage still exists, the whole injector is scrapped, the production progress is seriously influenced, and meanwhile, great economic loss is caused.

Disclosure of Invention

The technical problem solved by the invention is as follows: the method for repairing the injector by electron beam welding overcomes the defects in the prior art, realizes effective connection of the insole and the nozzle by adopting a preset copper ring and electron beam welding mode, and solves the problem of leakage of an airtight test at a brazing seam part of the insole and the nozzle.

The technical scheme of the invention is as follows:

a method of electron beam welding rework of injectors comprising the steps of:

(1) confirming the position of leakage in an air-tight test of a nozzle of an injector and a middle sole brazing seam, checking the number of the nozzles with leakage in the brazing seam, and processing copper rings with corresponding number;

(2) processing a ring groove at the connection part of the nozzle with leakage in the brazing seam and the middle sole;

(3) welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the insole through the melted copper ring;

(4) and (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and checking whether the welding seam of the insole and the nozzle leaks or not.

Further, the diameter of the injector in the step (1) isThe number of nozzles isAnd (4) respectively.

Further, the bottom material of the injector is stainless steel, and the nozzle material is chrome bronze or red copper.

Further, the axial length of the copper ring in the step (1) isRadial width of copper ringThe copper ring material is chromium bronze or red copper.

Furthermore, the size of the ring groove in the step (2) is matched with that of the copper ring, so that after the copper ring is placed in the ring groove, the butt joint gaps and the dislocation between the copper ring and the insole and between the copper ring and the nozzle are not more than 0.1 mm.

Further, the distance b between the electron beam welding position and the inner surface of the copper ring in the step (3) is

Further, the electron beam current in the step (3) is

Further, the focusing current isThe acceleration voltage was 60 KV.

Further, the pressure of the gas tightness test in the step (4) is

Further, the welding speed in the step (3) is

Compared with the prior art, the invention has the beneficial effects that:

(1) compared with the original repeated brazing repair mode, the qualification rate is greatly improved, the connection strength and compactness of the insole and the nozzle are greatly improved due to the adoption of the preset copper ring and electron beam welding mode, and the qualification rate of the brazing seam leaked in the air-tight test repaired by adopting the technology of the invention reaches more than 97 percent;

(2) the invention saves mass production cost, because the diameter of the injector is relatively large, the number of the nozzles is large, the temperature rise rate and the temperature difference of each nozzle and the middle-bottom connecting part are large, and the quality of all the nozzles and the middle-bottom brazing seams is difficult to ensure in the brazing process, therefore, each injector can cause the leakage problem of the individual nozzle and the middle-bottom brazing seam in the airtight test.

Drawings

FIG. 1 is a schematic view of the injector prior to rework of the present invention;

fig. 2 is a schematic structural view of the pre-copper ring repair injector of the present invention.

Detailed Description

The invention is further illustrated by the following examples.

As shown in fig. 1 and 2, the injector related to the invention consists of a middle sole 1, brazing solder 2, a nozzle 3, an inner sole 4 and a copper ring 5.

A method of electron beam welding rework of injectors comprising the steps of:

(1) confirming the positions of the nozzles of the injector and the leakage positions of the middle-sole brazing seams in the airtight test, verifying the number of the nozzles with the leakage of the brazing seams, and processing the corresponding number of copper rings.

(2) And processing a ring groove at the connecting part of the nozzle with the leaked brazing seam and the middle sole.

(3) And welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the middle sole through the melted copper ring.

(4) And (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and inspecting whether the welding seams of the insole and the nozzle leak or not by manufacturing a special airtight test tool.

The diameter of the injector in the step (1) isThe number of nozzles isThe material of the middle bottom of the injector is stainless steel. The nozzle material is chromium bronze or red copper.

The axial length of the copper ring in the step (1) isRadial width of copper ring The copper ring material is chromium bronze or red copper.

And (3) matching the size of the middle ring groove in the step (2) with the size of the copper ring, and ensuring that the butt joint gaps and the malpositions of the copper ring and the insole and the copper ring and the nozzle are not more than 0.1mm after the copper ring is placed in the ring groove.

The distance b from the electron beam welding position to the inner surface of the copper ring in the step (3) is The electron beam current isThe welding speed isA focusing current ofThe acceleration voltage was 60 KV.

The pressure of the air-tight test in the step (4) is

Example 1

(1) Confirming the positions of the nozzles of the injector and the leakage positions of the middle-sole brazing seams in the airtight test, verifying the number of the nozzles with the leakage of the brazing seams, and processing the corresponding number of copper rings. The diameter of the injector is 500mm, the number of the nozzles is 360, and the bottom material of the injector is stainless steel. The nozzle material is chromium bronze or red copper. The axial length of the processed copper ring is 3mm, and the radial width of the copper ring is 0.8 mm. The copper ring material is chromium bronze or red copper.

(2) And processing a ring groove at the connecting part of the nozzle with the leaked brazing seam and the middle sole. The size of the ring groove is matched with that of the copper ring, and after the copper ring is placed in the ring groove, the butt joint gaps and the dislocation between the copper ring and the insole and between the copper ring and the nozzle are not larger than 0.1 mm.

(3) And welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the middle sole through the melted copper ring. The distance b between the welding position of the electron beam and the inner surface of the copper ring is 0.3mm, and the electron beam current is 40 mA; the welding speed is 400mm/min, and the focusing current is 2100 mA; the acceleration voltage was 60 KV.

(4) And (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and inspecting whether leakage exists at the connection part of the insole and the nozzle or not by manufacturing a special airtight test tool. The airtightness test pressure was 1.8 MPa.

Example 2

(1) Confirming the positions of the nozzles of the injector and the leakage positions of the middle-sole brazing seams in the airtight test, verifying the number of the nozzles with the leakage of the brazing seams, and processing the corresponding number of copper rings. The diameter of the injector is 450mm, the number of the nozzles is 260, and the bottom material of the injector is stainless steel. The nozzle material is chromium bronze or red copper. The axial length of the processed copper ring is 4mm, and the radial width of the copper ring is 1.0 mm. The copper ring material is chromium bronze or red copper.

(2) And processing a ring groove at the connecting part of the nozzle with the leaked brazing seam and the middle sole. The size of the ring groove is matched with that of the copper ring, and after the copper ring is placed in the ring groove, the butt joint gaps and the dislocation between the copper ring and the insole and between the copper ring and the nozzle are not larger than 0.1 mm.

(3) And welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the middle sole through the melted copper ring. The distance b between the welding position of the electron beam and the inner surface of the copper ring is 0.5mm, and the electron beam current is 50 mA; the welding speed is 500mm/min, and the focusing current is 2150 mA; the acceleration voltage was 60 KV.

(4) And (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and inspecting whether leakage exists at the connection part of the insole and the nozzle or not by manufacturing a special airtight test tool. The airtightness test pressure was 2.0 MPa.

Example 3

(1) Confirming the positions of the nozzles of the injector and the leakage positions of the middle-sole brazing seams in the airtight test, verifying the number of the nozzles with the leakage of the brazing seams, and processing the corresponding number of copper rings. The diameter of the injector is 480mm, the number of the nozzles is 300, and the bottom material of the injector is stainless steel. The nozzle material is chromium bronze or red copper. The axial length of the processed copper ring is 3.5mm, and the radial width of the copper ring is 0.9 mm. The copper ring material is chromium bronze or red copper.

(2) And processing a ring groove at the connecting part of the nozzle with the leaked brazing seam and the middle sole. The size of the ring groove is matched with that of the copper ring, and after the copper ring is placed in the ring groove, the butt joint gaps and the dislocation between the copper ring and the insole and between the copper ring and the nozzle are not larger than 0.1 mm.

(3) And welding the centering copper ring by adopting a vacuum electron beam welding mode so as to connect the nozzle and the middle sole through the melted copper ring. The distance b between the welding position of the electron beam and the inner surface of the copper ring is 0.4mm, and the electron beam current is 45 mA; the welding speed is 450mm/min, and the focusing current is 2130 mA; the acceleration voltage was 60 KV.

(4) And (4) carrying out airtight test inspection on the injector subjected to electron beam welding repair, and inspecting whether leakage exists at the connection part of the insole and the nozzle or not by manufacturing a special airtight test tool. The airtightness test pressure was 1.9 MPa.

To the injector of brazing the structure, it is not fine and close enough when insole and nozzle brazing seam, when airtight test inspection exists the seepage, through processing the copper ring, and reprocess insole and nozzle connection position, guarantee that the copper ring can put into smoothly between insole and the nozzle, adopt electron beam welded mode, suitable position welds on the copper ring, both realized the effective connection in copper ring and insole, the effective connection of copper ring and nozzle has been realized again, make insole and nozzle connection position airtight test qualified. The invention effectively improves the qualification rate of leakage repair of the brazing seam of the insole and the nozzle, leads the air-tight test of the injector to be qualified, avoids the rejection of the whole injector due to the leakage of the individual nozzle and the brazing seam of the insole, greatly saves the production cost and improves the production benefit.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.