A welding process for wide and ultra-thin high-temperature alloy strips for aircraft engines

Abstract

The present invention relates to the field of welding of high-temperature alloy strips and foils for manufacturing aircraft engines, and specifically to a welding process for wide and ultra-thin high-temperature alloy strips for aircraft engines, including selecting high-temperature alloy slabs, welding pre-treatment, welding process and welding post-treatment. The invention mainly ensures a low defect rate of high-temperature alloy plates during the welding process and significantly improves the mechanical properties and high-temperature resistance of welded joints by optimizing welding parameters, selecting special welding materials and innovating welding methods. The invention aims to solve the shortcomings of my country's high-end high-temperature alloy plate and strip welding technology, fill the technical gap and meet the stringent requirements of aircraft engines on material performance and reliability.

Description

Technical Field

[0001] The invention relates to the field of welding of high-temperature alloy strips and foils for manufacturing aircraft engines, and in particular to a welding process for wide and ultra-thin high-temperature alloy strips for aircraft engines. Background Art

[0002] High-temperature alloy strips have become an indispensable key material in the manufacture of aircraft engines due to their excellent high-temperature strength, outstanding oxidation resistance and thermal corrosion resistance, as well as excellent fatigue resistance and fracture toughness, and play a vital role in improving the overall performance of the engine. However, my country is relatively backward in the research and development of high-end high-temperature alloy plates and strips, and the production of high-end strips relies on imports. Once the import channels are blocked, it will seriously restrict the development and application of my country's aviation equipment.

[0003] In addition, domestic high-temperature alloy billets are mainly in the form of hot-rolled plates. Traditional strip production uses coils with a length of usually more than 10 meters for continuous rolling, while the length of hot-rolled plates of high-temperature alloys in my country is only about 1 meter, which cannot meet the needs of continuous production. In order to achieve mass production, hot-rolled plates must be connected into coils through welding processes.

[0004] For wide and ultra-thin strips with a thickness of 1.0 to 1.5 mm and a width of 600 to 620 mm, the wider the plate, the more difficult it is to weld, and the thickness and performance instability of the weld will be higher. The welding process using conventional hot-rolled plates will result in obvious welding areas, and the thickness, width and performance of these areas are different from those of the high-temperature alloy parent material; the thinner the strip, the more precisely the size of the weld and the depth of penetration must be controlled during welding, and the stability requirements of the welding machine are extremely high. In addition, precise control of heat input and a very delicate energy balance are required to avoid welding perforation, deformation, bending, and to ensure that the metal melts without significant vaporization and plasma.

[0005] Therefore, there is an urgent need to develop a new wide-width nickel-based corrosion-resistant alloy strip welding process to ensure that the welding area is consistent with the parent material in thickness, width and performance to ensure subsequent continuous production. Summary of the invention

[0006] The purpose of the present invention is to provide a welding process for wide and ultra-thin high-temperature alloy strips for aircraft engines, so as to ensure the welding stability of the wide and ultra-thin high-temperature alloy strips and fill the gap in the industry.

[0007] In order to achieve the above technical effects, the present invention discloses a welding process for wide and ultra-thin high-temperature alloy strips for aircraft engines.

[0008] A welding process for wide and ultra-thin high-temperature alloy strips for aircraft engines includes the following process steps:

[0009] S1. Select a high-temperature alloy slab that meets the requirements, with a slab thickness of 1.0-1.5 mm and a width of 600-620 mm;

[0010] S2. Pre-welding treatment: grinding the end face of the high-temperature alloy slab to remove burrs on the end face and cleaning the end face after beveling;

[0011] S3, welding;

[0012] 1) Welding method: wire feeding welding; the relationship between the size of the welding needle and the welding wire is: D = 2*d; where D is the diameter of the welding needle, in mm; d is the diameter of the welding wire, in mm; the welding shielding gas is argon;

[0013] 2) The welding wire should be high temperature alloy welding wire of the same grade;

[0014] 3) The selection of welding current and welding speed is as follows: I = 10*V + 147, where I is welding current, A; V is welding speed, mm / min;

[0015] 4) Welding gas flow: Q 正 =-Q 反 +17; among them, Q 正 Q is the argon gas flow rate at the welding front, L / min; 反 Argon gas flow rate on the reverse side of welding, L / min;

[0016] 5) The process parameters of wire feeding equipment during welding are as follows: V 送 =0.5*T-1.6*t+4, and T=0.8*t+0.6, where V 送 is the wire feeding speed, mm / min; T is the delayed wire feeding time, s; t is the retraction time, s; pulse frequency 1Hz;

[0017] S4. Post-welding treatment: Grind the weld surface.

[0018] As a preferred technical solution, the mass content of the chemical composition of the high-temperature alloy slab in S1 is as follows: C: 0.020-0.080%; Ni: 50.00-55.00%; Cr: 17.00-21.00%; Mo: 2.80-3.30%; Al: 0.30-0.70%; Ti: 0.75-1.15%; B: 0.002-0.006%; Nb: 4.80-5.50%; Mn: ≤0.35%; Si≤0.35%; S≤0.015%; P≤0.015%; Cu≤0.20%; Co≤1.0%; Ta≤0.10; Pb≤0.0010%; Ag≤0.0005%; Bi≤0.0001%; ​​Ca≤0.010%; Mg≤0.010; the balance is Fe.

[0019] As a preferred technical solution, the high-temperature alloy slab in S1 has a thickness of 1.0 to 1.5 mm, a width of 600 to 620 mm, and a length of 3900 mm.

[0020] As a preferred technical solution, the groove types in S2 include V-shaped, U-shaped and J-shaped.

[0021] As a preferred technical solution, the groove type in S2 is a V-shaped groove.

[0022] As a preferred technical solution, in S3, D is 2.0-2.4 mm; d is 1.0-1.2 mm.

[0023] As a preferred technical solution, the selection of the chemical composition mass content of the welding wire in S3 is as follows:

[0024] C: ≤0.08; Si: ≤0.30%; Mn: ≤0.35%; P: ≤0.015%; S: ≤0.015%; Al: 0.2~0.6%;

[0025] Ni: 50.0~55.0%; Mo: 2.8~3.3%; Cr: 17.0~21.0%; Ti: 0.65~1.15; Nb: 4.75~5.50%; the balance is Fe.

[0026] As a preferred technical solution, in S3, the welding current A is 167-172A, and the welding speed V is 2-2.5 mm / min.

[0027] As a preferred technical solution, the argon gas flow rate Q at the welding front in S3 正 The argon gas flow rate Q on the reverse side of welding is 10-12L / min. 反 5~7L / min.

[0028] As a preferred technical solution, the wire feeding speed V in S3 送 It is 1.9~3.1mm / mim, the delayed wire feeding time T is 1.4~2.2s, and the withdrawal time t is 1~2s.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides a detailed technical solution for the welding process of wide and ultra-thin high-temperature alloy strips for aircraft engines. By optimizing welding parameters, selecting special welding materials and innovating welding methods, the physical properties of the weld are good, the weld is well bonded with the parent material, there is no obvious fusion line, the grain size is above level 7, the grains are not obviously coarsened, and the heat-affected zone is the same as the weld structure, ensuring stable welding performance. This enables the welded high-temperature alloy plate to withstand extreme working environments and high-load operating conditions, meeting the stringent requirements of aircraft engines for material performance and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the metallographic structure image of the weld in Example 1;

[0032] Figure 2 is the metallographic structure image of the weld in Example 2;

[0033] Figure 3 This is the metallographic structure image of the heat affected zone in Example 1;

[0034] Figure 4 This is the metallographic structure image of the heat affected zone in Example 2. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0036] The present invention provides a welding process for a wide ultra-thin high-temperature alloy strip for an aircraft engine, comprising the following process steps:

[0037] S1. Select a high-temperature alloy slab that meets the requirements; specifically, a high-temperature alloy slab with a thickness of 1.0 to 1.5 mm, a width of 600 to 620 mm, and a length of 3900 mm;

[0038] Alloying of metal elements such as Cr and Ni in high-temperature alloys will have a certain impact on the welding performance of the alloy. Ti and Nb give it good welding performance. Among them, Ti is a strong deoxidizer in steel. It can make the internal structure of steel dense, refine the grains, reduce aging sensitivity and cold brittleness, and improve welding performance. Nb can refine the grains and reduce the overheating sensitivity and temper brittleness of steel, improve strength, but plasticity and toughness are reduced. Adding niobium to steel can improve resistance to atmospheric corrosion and resistance to hydrogen, nitrogen, and ammonia corrosion at high temperatures. Niobium can improve welding performance. Adding niobium to austenitic stainless steel can prevent intergranular corrosion. Therefore, it is necessary to strictly control the composition ratio of each alloy element. In the present invention, the mass content of the chemical composition of the high-temperature alloy slab is as follows: C: 0.020-0.080%; Ni: 50.00-55.00%; Cr: 17.00-21.00%; Mo: 2.80-3.30%; Al: 0.30-0.70%; Ti: 0.75-1.15%; B: 0.002-0.006%; Nb: 4.80-5.50%; Mn: ≤0.35%; Si≤0.35%; S≤0.015%; P≤0.015%; Cu≤0.20%; Co≤1.0%; Ta≤0.10; Pb≤0.0010%; Ag≤0.0005%; Bi≤0.0001%; ​​Ca≤0.010%; Mg≤0.010; the balance is Fe.

[0039] S2. Pre-welding treatment;

[0040] In the welding process of high-temperature alloy strips, the problem of large pores in the weld metal is easy to occur. In order to avoid this phenomenon, strict grinding and cleaning of the welding area should be done before welding to keep the welding area highly clean and ensure that the front and back of the welding area will not be polluted by the atmosphere. Specifically, use No. 80 sandpaper to grind the end face of the high-temperature alloy slab, remove the burrs on the end face, and make a "V"-shaped groove on the end face. After grinding, wipe the end face with alcohol to keep the welding area highly clean.

[0041] Groove design can help the weld fill metal better, ensure that the weld fully covers and penetrates into the interior of the weldment, thereby obtaining a stronger connection and reducing the possibility of defects such as lack of fusion and lack of penetration. At the same time, it increases the weld area and improves the load-bearing capacity of the welded joint. A larger weld area means higher connection strength and better structural integrity, and improves welding accessibility. Common groove types include V-shaped, U-shaped, and J-shaped. Among them, V-shaped grooves are more suitable for thin strips of 1.0-1.5mm. The angle of the V-shaped groove is moderate, which is convenient for welders to operate and can ensure welding quality. The design of the V-shaped groove enables the welding material to better fill the groove, reducing difficulties and defects in the welding process. Compared with other groove forms, the V-shaped groove has less filling metal under the same plate thickness, and has less welding stress and deformation.

[0042] S3, welding;

[0043] 1) Welding method: wire feeding welding;

[0044] At present, the commonly used welding methods are wire-filling welding and wire-feeding welding. The advantage of wire-filling welding is that the shape of the wire can be controlled, which is suitable for high-quality welding; the disadvantage is that the processing speed is slow. The advantage of wire-feeding equipment is that the processing speed is fast and it can complete automatic operation, but the feeding nozzle is a straight nozzle, which makes the welding wire and the slab have a certain angle, resulting in the welding wire easily colliding with the slab during wire-feeding welding, causing scratches on the surface of the weld and poor welding.

[0045] In order to take into account both welding speed and welding quality, the present invention changes the wire feeding nozzle on the traditional wire feeding equipment from a straight nozzle to a curved nozzle, so that the curved wire feeding nozzle remains parallel to the slab. When feeding the wire, the welding wire is parallel to the slab, ensuring smooth wire feeding.

[0046] The relationship between the welding needle and welding wire size is: D = 2*d;

[0047] Wherein, D is the diameter of the welding needle, mm, preferably 2.0-2.4 mm; d is the diameter of the welding wire, mm, preferably 1.0-1.2 mm; the welding shielding gas is argon;

[0048] The relationship between the wire diameter and the needle diameter is mainly reflected in the impact on arc stability and welding quality during welding. The wire diameter has a significant impact on arc stability, metal spatter and droplet transition during welding. As the wire diameter increases, the short circuit frequency and droplet falling speed will decrease, and vice versa. In order to maintain the stability of the arc, the needle diameter needs to be adjusted according to the wire diameter, and the two are proportional.

[0049] 2) The welding wire uses the same grade of high-temperature alloy to ensure that the welding point has the same properties and performance after welding. In addition, selecting welding materials that match the parent material can also improve the crack resistance and mechanical properties of the welded joint, ensuring the strength and reliability of the welded joint.

[0050] Specifically, the selection of the chemical composition mass content of the welding wire is as follows:

[0051] C: ≤0.08; Si: ≤0.30%; Mn: ≤0.35%; P: ≤0.015%; S: ≤0.015%; Al: 0.2~0.6%;

[0052] Ni: 50.0~55.0%; Mo: 2.8~3.3%; Cr: 17.0~21.0%; Ti: 0.65~1.15; Nb: 4.75~5.50%; the balance is Fe.

[0053] 3) The selection of welding current and welding speed is as follows: I = 10*V + 147, where I is welding current, A; V is welding speed, mm / min;

[0054] When welding high-temperature alloys, the selection of welding current and welding speed has an important influence on the welding quality. When the welding speed increases, the welding current will also increase accordingly, because a larger current can provide more heat and arc force, thereby accelerating the melting of the metal. The welding speed effectively avoids overheating and burn-through during welding. Usually, a moderate welding speed is selected to avoid cracks caused by rapid cooling. The size of the welding current directly affects the depth and width of the weld and the quality of the weld.

[0055] Therefore, the welding current A is preferably 167-172A, and the welding speed V is preferably 2-2.5 mm / min;

[0056] 4) Welding gas flow: Q 正 =-Q 反 +17; among them, Q 正 Q is the argon gas flow rate at the welding front, L / min; 反 Argon gas flow rate on the reverse side of welding, L / min;

[0057] Correct gas flow has an important impact on welding quality. If the gas flow is too large, the blowing force of the weld pool will increase, the cooling effect will be strengthened, turbulent airflow will be formed, gas protection will be destroyed, and pores will be generated in the weld. If the gas flow is too small, the protection ability of the molten pool will be weakened, and pores will be easily generated. Usually the gas flow is controlled at 5-10L / min. When welding high-temperature alloy strips, in order to ensure the welding quality on both sides, it is necessary to set the shielding gas on both sides. In order to ensure the quality of the plate shape and the surface quality of the weld after welding, the positive and negative gas flow rates are inversely proportional.

[0058] Therefore, the welding front argon gas flow rate Q 正 The preferred argon gas flow rate Q on the reverse side of welding is 10-12 L / min. 反 Preferably 5 to 7 L / min.

[0059] 5) The process parameters of wire feeding equipment during welding are as follows: V 送 =0.5*T-1.6*t+4, and T=0.8*t+0.6, where V 送 is the wire feeding speed, mm / min; T is the delayed wire feeding time, s; t is the retraction time, s; the pulse frequency is 1Hz.

[0060] The wire feed speed is affected by factors such as material thickness, welding type and welding requirements. For example, thicker materials require higher wire feed speeds to ensure the continuity and density of the weld, while thinner materials require lower wire feed speeds to avoid excessively thick and uneven welds.

[0061] The wire feeding delay time of the wire feeding device refers to the time that the wire feeding device delays wire feeding before welding. Reasonable delay time setting can ensure the continuity of welding, ensure the temperature stability and uniformity of the welding area, and thus improve the welding quality.

[0062] The retraction time refers to the delay time after welding, when the wire feeding device continues to feed wire for a period of time. Reasonable retraction time setting can ensure the integrity of the welding tail end, the strip shape and welding quality. The delayed wire feeding time is proportional to the retraction time, which can ensure good welding quality.

[0063] Furthermore, the wire feeding speed V 送 The preferred range is 1.9 to 3.1 mm / mim, the delayed wire feeding time T is preferably 1.4 to 2.2 s, and the withdrawal time t is preferably 1 to 2 s.

[0064] S4. Post-welding treatment:

[0065] The weld surface is ground with a grinding wheel with a grit of 24 and a linear speed of 70-72 m / s to ensure that the thickness of the weld and the high-temperature alloy base material remain consistent, facilitating subsequent rolling processing.

[0066] Since the height of the weld is higher than the plane of the strip, the weld surface needs to be polished with a grinding wheel after welding to ensure that the thickness of the weld is the same as that of the high-temperature alloy base material, which is convenient for subsequent continuous rolling processing.

[0067] The following three embodiments are used to describe the welding process of high temperature alloy strip foil in detail:

[0068] Embodiment 1:

[0069] (1) Incoming materials:

[0070] High temperature alloy slab with thickness of 1.5mm, width of 620mm and length of 3900mm.

[0071] Its chemical composition is as follows:

[0072]

[0073] (2) Pretreatment before welding

[0074] Use No. 80 sandpaper to grind the end face of the high-temperature alloy slab to remove the burrs on the end face and make a "V"-shaped groove on the end face. After grinding, wipe the end face with alcohol to keep the welding area highly clean.

[0075] (3) Welding

[0076] Welding method: Use the same grade of high-temperature alloy welding wire for wire feeding welding, the wire diameter is 1.0mm, the welding needle diameter is 2.0mm, and the welding shielding gas is argon;

[0077] The chemical composition of welding wire is as follows:

[0078]

[0079] Welding equipment parameters: welding current 167A, welding speed 2mm / min, welding front argon gas flow 10L / min, welding back argon gas flow 7L / min;

[0080] Wire feeding equipment parameters: wire feeding speed 1.9mm / mim, delayed wire feeding time 2.2s, retraction time 2s, pulse frequency 1Hz.

[0081] (4) Post-welding treatment

[0082] The weld surface is ground with a grinding wheel with a grit of 24 and a linear speed of 72 m / s to ensure that the thickness of the weld and the high-temperature alloy base material remain consistent, facilitating subsequent rolling processing.

[0083] Embodiment 2:

[0084] (1) Incoming materials:

[0085] The chemical composition of the high-temperature alloy slab with a thickness of 1.2 mm, a width of 600 mm, and a length of 3900 mm is as follows:

[0086]

[0087] (2) Pretreatment before welding

[0088] Use No. 80 sandpaper to grind the end face of the high-temperature alloy slab to remove the burrs on the end face and make a "V"-shaped groove on the end face. After grinding, wipe the end face with alcohol to keep the welding area highly clean.

[0089] (3) Welding

[0090] Welding method: Use the same grade of high-temperature alloy welding wire for wire feeding welding, the wire diameter is 1.1mm, the welding needle diameter is 2.2mm, and the welding shielding gas is argon;

[0091] The chemical composition of welding wire is as follows:

[0092]

[0093] Welding equipment parameters: welding current 169A, welding speed 2.2mm / min, welding front argon gas flow 11L / min, welding back argon gas flow 6L / min;

[0094] Wire feeding equipment parameters: wire feeding speed 2.5mm / mim, delayed wire feeding time 1.8s, retraction time 1.5s, pulse frequency 1Hz.

[0095] (4) Post-welding treatment

[0096] The weld surface is ground with a grinding wheel with a grit of 24 and a linear speed of 71 m / s to ensure that the thickness of the weld and the high-temperature alloy base material remain consistent, facilitating subsequent rolling processing.

[0097] Embodiment 3:

[0098] (1) Incoming materials:

[0099] High temperature alloy slab with thickness of 1.0mm, width of 615mm and length of 3900mm.

[0100] Its chemical composition is as follows:

[0101]

[0102] (2) Pretreatment before welding

[0103] Use No. 80 sandpaper to grind the end face of the high-temperature alloy slab to remove the burrs on the end face and make a "V"-shaped groove on the end face. After grinding, wipe the end face with alcohol to keep the welding area highly clean.

[0104] (3) Welding

[0105] Welding method: Use the same grade of high-temperature alloy welding wire for wire feeding welding, the wire diameter is 1.2mm, the welding needle diameter is 2.4mm, and the welding shielding gas is argon;

[0106] The chemical composition of welding wire is as follows:

[0107]

[0108] Welding equipment parameters: welding current 172A, welding speed 2.5mm / min, welding front argon gas flow 12L / min, welding back argon gas flow 5L / min;

[0109] Wire feeding equipment parameters: wire feeding speed 3.1mm / mim, delayed wire feeding time 1.4s, retraction time 1s, pulse frequency 1Hz.

[0110] (4) Post-welding treatment

[0111] The weld surface is ground with a grinding wheel with a grit of 24 and a linear speed of 70 m / s to ensure that the thickness of the weld and the high-temperature alloy base material remain consistent, facilitating subsequent rolling processing.

[0112] Detection Example

[0113] The strips after welding in Examples 1 and 2 were subjected to color flaw detection to detect whether there were gaps inside the weld. Figures 1 to 4 shown.

[0114] At the same time, tensile tests and metallographic tests were carried out on the welding parts of Examples 1 to 3, and the yield strength can reach 1036MPa, the tensile strength can reach 1244MPa, the elongation can reach 34.5, the metallographic structures of the weld and heat-affected parts are both austenite, and the grain size can reach level 7.

[0115] Through the above tests, it can be known that by using the welding process of the present invention, the weld has good physical properties, good bonding with the base material, no obvious fusion line, the grain size is above level 7, the grains are not obviously coarsened, and the heat-affected zone is the same as the weld structure, ensuring stable welding performance.

[0116] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding process for wide ultra-thin high-temperature alloy strips for aircraft engines, characterized in that: The process steps include: S1. Select a high-temperature alloy slab that meets the requirements, with a slab thickness of 1.0-1.5 mm and a width of 600-620 mm; S2. Pre-welding treatment: grinding the end face of the high-temperature alloy slab to remove burrs on the end face and cleaning the end face after beveling; S3, welding; 1) Welding method: wire feeding welding; the relationship between the welding needle and the welding wire size is: D = 2*d; where D is the welding needle diameter, unit mm; d is the welding wire diameter, unit mm; the welding shielding gas is argon; 2) The welding wire should be high temperature alloy welding wire of the same grade; 3) The selection of welding current and welding speed is as follows: I = 10*V + 147, where I is welding current, A; V is welding speed, mm / min; 4) Welding gas flow: Q 正 =-Q 反 +17; among them, Q 正 Q is the argon gas flow rate at the welding front, L / min; 反 Argon gas flow rate on the reverse side of welding, L / min; 5) The process parameters of wire feeding equipment during welding are as follows: V 送 =0.5*T-1.6*t+4, and T=0.8*t+0.6, where V 送 is the wire feeding speed, mm / min; T is the delayed wire feeding time, s; t is the retraction time, s; pulse frequency 1Hz; S4. Post-welding treatment: Grind the weld surface.

2. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines according to claim 1, characterized in that: The mass contents of the chemical composition of the S1 high temperature alloy slab are as follows: C: 0.020-0.080%; Ni: 50.00-55.00%; Cr: 17.00-21.00%; Mo: 2.80-3.30%; Al: 0.30-0.70%; Ti: 0.75~1.15%; B: 0.002~0.006%; Nb: 4.80~5.50%; Mn: ≤0.35%; Si≤0.35%; S≤0.015%; P≤0.015%; Cu≤0.20%; Co≤1.0%; Ta≤0.10; Pb≤0.0010%; Ag≤0.0005%; Bi≤0.0001%; ​​Ca≤0.010%; Mg≤0.010; the balance is Fe.

3. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: The S1 high temperature alloy slab has a thickness of 1.0-1.5 mm, a width of 600-620 mm, and a length of 3900 mm.

4. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: The groove types in S2 include V-shaped, U-shaped and J-shaped.

5. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 3, characterized in that: The groove type in S2 is V-groove.

6. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: In S3, D is 2.0~2.4mm; d is 1.0~1.2mm.

7. The welding process for wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: The selection of the chemical composition mass content of the welding wire in S3 is as follows: C: ≤0.08; Si: ≤0.30%; Mn: ≤0.35%; P: ≤0.015%; S: ≤0.015%; Al: 0.2~0.6%; Ni: 50.0~55.0%; Mo: 2.8~3.3%; Cr: 17.0~21.0%; Ti: 0.65~1.15%; Nb: 4.75~5.50%; the balance is Fe.

8. The welding process for wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: In S3, the welding current A is 167-172A, and the welding speed V is 2-2.5mm / min.

9. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: Argon gas flow rate Q for welding front side in S3 正 The argon gas flow rate Q on the reverse side of welding is 10-12L / min. 反 5~7L / min.

10. The welding process of wide ultra-thin high-temperature alloy strip for aircraft engines as claimed in claim 1, characterized in that: S3 wire feeding speed V 送 It is 1.9~3.1mm / mim, the delayed wire feeding time T is 1.4~2.2s, and the withdrawal time t is 1~2s.

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