CN118616850A - Argon arc welding processing method of nozzle assembly and nozzle assembly - Google Patents

Abstract

The invention discloses an argon arc welding processing method of a nozzle assembly and the nozzle assembly, wherein a fuel guide pipe is welded with a fuel flow divider; then welding a fuel spray rod on the outer side wall of the fuel flow divider; further welding an air conduit at one end of the fuel splitter and welding a fuel conduit assembly at the other end; finally, the nozzle mounting end plate is welded on the outer side wall of the fuel conduit assembly, the sequence of each workpiece in the nozzle assembly in the welding processing process is newly adjusted, the welding quality of each step can be detected while processing in the processing process, when unqualified occurs, the whole part can be repaired in time, the scrapping of the whole part is avoided, the welding defects such as hot cracks or air holes and the like in the later stage are reduced, the interference of the parts in the welding process is avoided, the concentration of welding stress is avoided, the superposition of welding deformation is avoided, and the welding quality is improved.

Description

Argon arc welding processing method for nozzle assembly and nozzle assembly

Technical Field

The invention belongs to the technical field of industrial gas engine fuel gas nozzle processing, and relates to an argon arc welding processing method of a nozzle assembly and the nozzle assembly.

Background Art

A certain type of industrial gas turbine nozzle assembly is a welded assembly, including a pre-combustion stage nozzle and a main combustion stage fuel nozzle, and the pre-combustion stage nozzle and the main combustion stage fuel nozzle share a fuel inlet, wherein the pre-combustion stage nozzle includes six circumferentially evenly distributed fuel spray rods. The specific structure is shown in Figure 1, and argon arc welding is required.

Since the nozzle assembly has a compact structure, complex flow channel structure design, dense nozzles, narrow space structure, and a large number of concentrated welds, it involves welding of dissimilar materials, and the specific heat capacity and linear expansion coefficient of the materials differ greatly. Welding defects such as thermal cracks and pores are prone to occur in the welds and heat-affected zones. Due to the narrow space, welding stress is concentrated, welding deformation is superimposed, and it is directly connected to the flow channel, which can easily cause ablation or blockage of the gas flow channel. Therefore, during welding, high requirements are placed on welding quality, strict requirements on size and position, and the sealing performance is irreversible. The processing cost and difficulty of the nozzle assembly are high.

Summary of the invention

The purpose of the present invention is to solve the problems in the prior art of compact nozzle assembly structure, complex flow channel structure design, dense nozzles, narrow spatial structure, large and concentrated weld distribution, resulting in concentrated welding stress, superposition of welding deformation, and easy occurrence of welding defects such as thermal cracks and pores in the weld and heat affected zone. A method for argon arc welding of a nozzle assembly and a nozzle assembly are provided.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for processing a nozzle assembly using argon arc welding, comprising the following steps:

Weld the fuel pipe to the fuel manifold;

Welding a fuel spray rod to the outer side wall of the fuel distributor;

Weld the air conduit to one end of the fuel manifold and the fuel conduit assembly to the other end;

A nozzle mounting end plate is welded to the outer side wall of the fuel guide tube assembly.

A further improvement of the present invention is:

When the fuel pipe and the fuel diverter are welded, the welding current is 33-36A, the nozzle diameter is 10mm, and the argon gas flow rate ranges from 10-15L/min.

When the fuel spray rod is welded on the outer wall of the fuel distributor, the welding current is 45-49A, the nozzle diameter is 10mm, and the argon gas flow rate ranges from 10-15L/min.

When welding the air duct at one end of the fuel distributor, the welding current is 45-49A, the nozzle diameter is 10mm, and the argon gas flow rate ranges from 10-15L/min.

When welding the air conduit at one end of the fuel distributor, the method further comprises:

First, the base is laid by argon arc welding, and then the wire filling and covering welding are carried out in sections by argon arc welding.

When the argon arc welding is performed for base welding, the welding current is 42A.

During the filler wire cap welding, the penetration depth is 1.5 mm to 1.9 mm.

When welding the fuel conduit assembly at the other end of the fuel diverter, the welding current is 70-75A, the nozzle diameter is 10mm, and the argon gas flow rate ranges from 10-15L/min.

When welding the nozzle mounting end plate on the outer side wall of the fuel pipe assembly, the welding current is 70-75A, the nozzle diameter is 10mm, and the argon gas flow rate ranges from 10-15L/min.

A nozzle assembly is prepared according to any one of the argon arc welding processing methods of the present invention.

Compared with the prior art, the present invention has the following beneficial effects:

The invention discloses an argon arc welding processing method for a nozzle assembly. First, a fuel pipe is welded to a fuel diverter, and then a fuel spray rod is welded to the outer side wall of the fuel diverter. Further, an air pipe is welded to one end of the fuel diverter, and a fuel pipe assembly is welded to the other end. Finally, a nozzle mounting end plate is welded to the outer side wall of the fuel pipe assembly. The processing method makes a new adjustment to the sequence of welding processing of each workpiece in the nozzle assembly. During the processing, the welding quality of each step can be tested while processing. When welding failure occurs, timely repair can be carried out to avoid the scrapping of the entire part, reduce welding defects such as thermal cracks or pores in the nozzle at a later stage, and also avoid interference between parts during the welding process, avoid welding stress concentration, avoid welding deformation superposition, and improve welding quality.

Furthermore, in the present invention, different welding parameters are used for different parts during specific welding, and corresponding welding parameters are set according to different welding positions to avoid welding defects such as thermal cracks or pores, so that the welding quality is stable and the performance indicators are reliable.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

FIG1 is a structural diagram of a nozzle assembly to be processed according to an embodiment of the present invention;

FIG2 is a structural diagram of a fuel distributor in an embodiment of the present invention;

Fig. 3 is a cross-sectional view taken along the lines A-A and C-C of Fig. 2 of the present invention;

FIG4 is a cross-sectional view taken along the line B of FIG2 of the present invention;

FIG5 is a cross-sectional view taken along the line D of FIG2 of the present invention;

FIG6 is a structural diagram of a fuel spray bar according to an embodiment of the present invention;

Fig. 7 is a cross-sectional view taken along the line A-A of Fig. 6 of the present invention;

Fig. 8 is a cross-sectional view taken along the line B-B of Fig. 6 of the present invention.

Among them: 1- fuel pipe; 2- fuel distributor; 3- fuel spray rod; 4- air pipe; 5- fuel pipe assembly; 6- nozzle mounting end plate.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The present invention is further described in detail below in conjunction with the accompanying drawings:

The present invention discloses an argon arc welding processing method for a nozzle assembly, and the method is aimed at a compact structure, a complex flow channel structure design, dense nozzles, and a narrow space structure, see FIG1 .

The specific steps include:

Referring to FIGS. 1 to 8 , a method for processing a nozzle assembly by argon arc welding includes the following steps:

Step 1: Weld the fuel pipe 1 and the fuel distributor 2;

Specifically, the fuel pipe 1 is welded to one end of the fuel distributor 2 by argon arc welding, wherein the welding of the fuel pipe 1 and the fuel distributor 2 involves nickel-based high-temperature alloy and austenitic stainless steel, namely GH625+0Cr18Ni9;

During welding, the welding current is 33-36A, the power supply is DC positive connection, the nozzle diameter is 10mm, the argon gas flow range is 10-15L/min, and after welding, the position requirement of the fuel pipe 1 relative to the fuel diverter 2 is ensured by hammer correction, and non-destructive testing (fluorescence testing) and sealing performance tests are carried out.

Furthermore, when performing hammer correction, a wooden hammer or a rubber hammer is used, and cloth is wrapped around the surface of the wooden hammer or the rubber hammer.

Step 2: Weld the fuel spray rod 3 on the outer side wall of the fuel distributor 2;

Specifically, when the fuel spray rod 3 is welded on the outer wall of the fuel distributor 2, the welded fuel spray rod 3 is sleeved on the outer wall of the fuel distributor 2;

Furthermore, considering that the nozzles are densely packed, the spatial structure is narrow, and they are independent of each other, appropriate welding process parameters are selected, that is, the welding current is 45-49A, the power supply is DC positive connection, the nozzle diameter is 10mm, the argon flow range is 10-15L/min, the welding sequence is reasonably arranged, and a segmented and symmetrical welding process is adopted to balance the welding stress and ensure that the position of the jet hole 3 of the welding fuel spray rod is correct.

Step 3: Weld the air conduit 4 at one end of the fuel distributor 2, and weld the fuel conduit assembly 5 at the other end;

Specifically, the air conduit 4 and the fuel conduit 1 are both located at the same end of the fuel diverter 2, and the air conduit 4 is sleeved on the outside of the fuel conduit 1. When the fuel diverter 2 and the air conduit 4 are welded by argon arc welding, cobalt-based high-temperature alloy and austenitic stainless steel, namely GH188+0Cr18Ni9, are involved;

Furthermore, the welding current is 45-49A, the power supply is a direct current positive connection, the nozzle diameter is 10mm, and the argon gas flow range is 10-15L/min.

Furthermore, during welding, a reserved Y-shaped welding process groove is used, wherein the groove surface angle of the fuel diverter 2 is 60°, the groove surface angle of the air duct 4 is 45°, and the blunt edge thickness is 1±0.1 mm.

During welding, argon arc welding is used to prime the surface first, followed by segmented wire filling and covering welding. After welding, the entire part is heat treated to reduce residual stress after welding, and then non-destructive testing (fluorescence testing) and sealing performance tests are carried out.

Furthermore, when performing argon arc welding for base welding, the base welding current is 42A, and when performing wire filling and covering welding, the penetration depth is controlled to be 1.5 to 1.9 mm.

Furthermore, when the fuel diverter 2 and the fuel guide pipe assembly 5 are welded by argon arc welding, the welding current is 70-75A, the power supply is DC positive connection, the nozzle diameter is 10mm, the argon gas flow range is 10-15L/min, and it is rigidly fixed with the help of a welding fixture. A segmented and symmetrical welding process is adopted. After welding, a hammer is used for correction to ensure the length dimension and position requirements, and then non-destructive testing (fluorescence testing) and sealing performance tests are carried out.

Furthermore, when performing hammer correction, a wooden hammer or a rubber hammer is used, and cloth is wrapped around the surface of the wooden hammer or the rubber hammer.

Step 4: Weld the nozzle mounting end plate 6 to the outer side wall of the fuel pipe assembly 5 .

During welding, the welding current is 70-75A, the power supply is DC positive connection, the nozzle diameter is 10mm, the argon gas flow range is 10-15L/min, and it is rigidly fixed with the help of a welding fixture. A segmented and symmetrical welding process is adopted. After welding, a hammer is used for correction to ensure the length dimension and position requirements, and then non-destructive testing (fluorescence testing) and sealing performance tests are carried out.

Furthermore, when performing hammer correction, a wooden hammer or a rubber hammer is used, and cloth is wrapped around the surface of the wooden hammer or the rubber hammer.

In the welding method disclosed in the present invention, a new order of parts welding is proposed to solve the problems of dense nozzles and narrow spatial structure. The sequence data of each part is irreversible, and different process parameters are set according to the position and material characteristics of different workpieces. After each step of welding is completed, the welding quality and relative position between the two parts will be corrected and inspected to ensure that each step of welding is qualified and avoid welding stress concentration. When unqualified welding occurs, it can be repaired in time to avoid the scrapping of the entire workpiece. In addition, detection is carried out during the welding process, the welding quality is stable, the performance indicators are reliable, and the problems of welding defects such as thermal cracks and pores in the later stage are avoided. The process is safe and the economic benefits are considerable.

This embodiment also discloses a nozzle assembly, which is prepared according to the argon arc welding processing method disclosed in this embodiment. The obtained nozzle assembly has high welding quality and is free of welding defects such as thermal cracks and pores.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A method for processing a nozzle assembly using argon arc welding, characterized in that it comprises the following steps: Welding the fuel pipe (1) and the fuel distributor (2); Welding a fuel spray rod (3) on the outer side wall of the fuel distributor (2); An air conduit (4) is welded to one end of the fuel distributor (2), and a fuel conduit assembly (5) is welded to the other end; A nozzle mounting end plate (6) is welded to the outer side wall of the fuel pipe assembly (5). 2. The argon arc welding processing method of a nozzle assembly according to claim 1 is characterized in that when welding the fuel pipe (1) and the fuel diverter (2), the welding current is 33-36A, the nozzle diameter is 10mm, and the argon gas flow range is 10-15L/min. 3. The argon arc welding processing method of a nozzle assembly according to claim 1 is characterized in that when welding the fuel nozzle rod (3) on the outer wall of the fuel diverter (2), the welding current is 45-49A, the nozzle diameter is 10mm, and the argon gas flow range is 10-15L/min. 4. The argon arc welding processing method of a nozzle assembly according to claim 1 is characterized in that when welding the air duct (4) at one end of the fuel diverter (2), the welding current is 45-49A, the nozzle diameter is 10mm, and the argon gas flow range is 10-15L/min. 5. The argon arc welding method for a nozzle assembly according to claim 4, characterized in that when welding the air duct (4) at one end of the fuel diverter (2), it also includes: First, the base is laid by argon arc welding, and then the wire filling and covering welding are carried out in sections by argon arc welding. 6. The argon arc welding processing method of a nozzle assembly according to claim 5 is characterized in that the welding current is 42A during the argon arc welding primer. 7. The argon arc welding method for a nozzle assembly according to claim 5, characterized in that during the filler wire cap welding, the penetration depth is 1.5 mm to 1.9 mm. 8. The argon arc welding processing method of a nozzle assembly according to claim 1 is characterized in that when welding the fuel pipe assembly (5) at the other end of the fuel diverter (2), the welding current is 70-75A, the nozzle diameter is 10mm, and the argon gas flow range is 10-15L/min. 9. The argon arc welding processing method of a nozzle assembly according to claim 1 is characterized in that when welding the nozzle mounting end plate (6) on the outer wall of the fuel pipe assembly (5), the welding current is 70-75A, the nozzle diameter is 10mm, and the argon gas flow range is 10-15L/min. 10. A nozzle assembly, characterized in that it is prepared according to the argon arc welding processing method according to any one of claims 1-9.