Welding deformation control method for high-temperature alloy ring type flame tube wall

Abstract

The invention provides a welding deformation control method for a high-temperature alloy ring type flame tube wall. The welding deformation control method comprises the following steps: S1, determining a welding seam form; s2, testing the welding deformation of the annular heating wire argon arc automatic welding; s3, the pre-deformation pressure of the flame tube wall is detected; s4, the pre-deformation amount is set; s5, welding pre-deformation is carried out; s6, flame tube wall hot wire argon arc automatic welding; and S7, flame tube wall measurement. According to a welding deformation generation principle, welding deformation is quantified and reasonable deformation compensation is set by exploring and testing a hot wire argon arc automatic welding deformation rule and deformation, so that hot wire argon arc automatic welding deformation prevention control of a thin plate flame tube wall is realized; on one hand, the problems that deformation cannot be controlled after constraint is released, residual stress is large and possibly generated stress cracks are caused by a rigid limiting method are avoided, on the other hand, deformation control can be carried out on parts which cannot be subjected to square limiting, and the machining quality of the thin plate welding flame tube wall is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature alloy welding technology, and in particular relates to a high-temperature alloy ring-type flame tube wall welding deformation control method. Background Art

[0002] The annular flame tube wall is a flame tube wall structure widely used in gas turbine combustion chambers. It has both process feasibility and cost advantages. However, due to the weak rigidity of the thin plate flame tube wall, a large number of welding processes will produce large deformation and residual stress, especially for the flame tube wall that cannot be processed. It is difficult to ensure the size by reserving processing allowance. For the repair process, the thin-walled flame tube wall has reached the final size, and the requirements for deformation control are higher, which is difficult to meet the requirements of high precision and high reliability. At present, the deformation control process of thin-walled welded flame tube walls conventionally adopts manual argon arc welding with rigid fixed limit tooling. Although it can reduce deformation to a certain extent, it often leads to large residual stress and uncontrollable deformation, and the risk of repair and manufacturing is relatively high.

[0003] Hot wire argon arc automatic welding is a process in which a tungsten electrode is used as an electrode end in the air, argon gas is used to protect the metal welding material, an arc is formed at the tungsten electrode end through a high current, the welding wire is heated and then fed into the arc, and the welding wire and the metal are melted into a liquid state and a molten pool is formed under the action of the arc, thereby completing the welding process. Hot wire argon arc automatic welding has the advantages of concentrated and stable welding heat input, small single-point heat input, beautiful welding appearance, can be used for welding of large-sized ring components, and can also be used for welding components that have been heat-treated. It has advantages and special functions that are difficult to match with traditional fusion welding methods, such as consistent weld formation, small welding heat-affected zone, small deformation, good organizational performance, easy to realize computer control, good welding parameter repeatability and stability, strong adaptability, and can weld thin plates, etc., so it has been rapidly promoted and applied to the fields of precision technology and aerospace and other mechanical manufacturing industries. The present invention utilizes the advantages of good stability and consistency of the welding process of hot wire argon arc automatic welding, and compensates for welding deformation through precise control of assembly gap, welding parameters and pre-deformation, thereby realizing precise control of welding deformation of thin-walled flame tube wall.

[0004] High temperature alloy ring flame tube wall structure Figure 1 As shown in the figure, the main welding parts include welding structures such as rings, shells, shells, column rings and rings. There are a large number of welds. The manual argon arc automatic welding process with a small deformation is adopted, and the accumulated welding deformation is also large. The welding deformation is mainly due to the expansion during the local heating and melting process and the contraction deformation during the cooling and solidification process. The contraction is greater than the expansion, which eventually manifests as welding contraction deformation. The original welding process uses manual argon arc welding, which has uneven energy input, large heat-affected zone and large welding deformation, many human factors, poor process stability and consistency, and it is difficult to achieve precise control through welding process and pre-deformation. Summary of the invention

[0005] The purpose of the present invention is to provide a method for controlling welding deformation of a high-temperature alloy ring flame tube wall, which realizes precise control of deformation through hot wire argon arc automatic welding, and ensures that the dimensional accuracy requirements of the flame tube wall of the welded structure are met after new product guidance and repair.

[0006] A method for controlling welding deformation of a high-temperature alloy ring-type flame tube wall comprises the following steps:

[0007] S1, determine the weld form: the structural weld form of the flame tube wall is a single-sided groove and double-sided forming form, and the groove form adopts a Y-shaped groove;

[0008] S2, test the deformation of the hot wire argon arc automatic welding: design a hot wire argon arc automatic welding test piece, determine the hot wire argon arc automatic welding parameters, apply the same amount of preload force to both ends of the hot wire argon arc automatic welding test piece and the inner side of the test piece, detect the shrinkage of the hot wire argon arc automatic welding, and record the shrinkage data;

[0009] S3, testing the pre-deformation pressure of the flame tube wall: using a pressure testing instrument to measure the pressure of different expansion amounts at the repair position of the flame tube wall, and record the pressure data;

[0010] S4, setting of pre-deformation: comprehensively analyzing the deformation, pressure and shrinkage data of flame tube wall, determining the welding shrinkage through preload test, and setting the welding pre-deformation at the hot wire argon arc welding position of flame tube wall;

[0011] S5, welding pre-deformation: according to the welding pre-deformation amount set in S4, the size of the flame tube wall tooling assembly position is measured and adjusted to ensure that the flame tube wall assembly position is larger than the theoretical assembly position, and the flame tube wall is assembled to the flame tube wall tooling to achieve welding pre-deformation;

[0012] S6, hot wire argon arc automatic welding of the flame tube wall: hot wire argon arc automatic welding parameters determined in S2 are used to perform hot wire argon arc welding on the flame tube wall;

[0013] S7, flame tube wall measurement: measure the dimensional parameters of the flame tube wall and compare them with the measured dimensions before welding. If the welding deformation does not exceed 0.3mm, the flame tube wall welding deformation control requirements are met.

[0014] Furthermore, the preload force applied to both ends of the hot wire argon arc automatic welding test piece in S2 is in the range of 1-2 KN.

[0015] Furthermore, the welding deformation amount in S4 is less than or equal to the difference between the flame tube wall assembly position and the theoretical assembly position.

[0016] Furthermore, the assembly position of the flame tube wall in S5 is larger than the theoretical assembly position by a pre-deformation amount.

[0017] The beneficial effects of the present invention are:

[0018] The present invention is based on the principle of welding deformation, through exploration and testing of the deformation law and deformation amount of hot wire argon arc automatic welding, quantifies the welding deformation, sets reasonable deformation compensation, and realizes the hot wire argon arc automatic welding prevention and deformation control of the thin plate flame tube wall. On the one hand, it avoids the uncontrollable deformation after releasing the constraint, large residual stress and possible stress cracks caused by the rigid limiting method. On the other hand, it can realize the deformation control of the parts that cannot be square limited, thereby improving the processing quality of the thin plate welding flame tube wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the flame tube wall structure provided by the present invention;

[0020] Figure 2 A schematic diagram of the flame tube wall welding tooling provided by the present invention;

[0021] Figure 3 This is a schematic diagram of a hot wire argon arc automatic welding test piece provided by the present invention.

[0022] In the figure: 1, ring, 2, shell, 3, outer shell, 4, row ring, 5, ring. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings.

[0025] like Figure 1-Figure 3 As shown, a method for controlling deformation of high-temperature alloy ring flame tube wall welding comprises the following steps:

[0026] S1, determine the weld form: the structural weld form of the flame tube wall is a single-sided groove and double-sided forming form, and the groove form adopts a Y-shaped groove;

[0027] S2, test the deformation of the hot wire argon arc automatic welding: design a hot wire argon arc automatic welding test piece, determine the hot wire argon arc automatic welding parameters, apply the same amount of preload force to both ends of the hot wire argon arc automatic welding test piece and the inner side of the test piece, detect the shrinkage of the hot wire argon arc automatic welding, and record the shrinkage data;

[0028] According to the process plan of hot wire argon arc automatic welding of flame tube wall, the design is as follows Figure 3The welding test piece shown in the figure is used to determine the welding parameters. The hot wire argon arc automatic welding parameters in this embodiment are shown in Table 1. The welding shrinkage is detected under the conditions of applied preload of 0 KN, 0.1 KN, 0.5 KN, and 1 KN, respectively. The welding shrinkage is shown in Table 2.

[0029]

[0030] Table 1

[0031] Preload 0KN 0.1KN 0.5KN 1.0KN Shrinkage 2mm 1.8mm 1.1mm 1.1mm

[0032] Table 2

[0033] S3, testing the pre-deformation pressure of the flame tube wall: using a pressure testing instrument to measure the pressure of different expansion amounts at the repair position of the flame tube wall, and record the pressure data;

[0034] like Figure 2 As shown, a pressure tester is used to test the pressure of different expansion amounts at the flame tube wall repair position, and the pressure data is recorded. The pressure data is shown in Table 3.

[0035] Pre-deformation 0.1mm 0.5mm 1.0mm 1.5mm pressure 0.05KN 0.2KN 0.3KN 0.5KN

[0036] Table 3

[0037] S4, setting of pre-deformation: comprehensively analyzing the deformation, pressure and shrinkage data of flame tube wall, determining the welding shrinkage through preload test, and setting the welding pre-deformation at the hot wire argon arc welding position of flame tube wall;

[0038] The deformation, pressure and welding shrinkage data of the flame tube wall were comprehensively analyzed, and the unit welding shrinkage deformation was determined through the preload test. Under the condition that the preload did not exceed 1KN, the welding shrinkage was basically stabilized at 1.1mm / weld. The flame tube wall needed to complete three welds of hot wire argon arc automatic welding, and the pre-deformation was set to 3.3mm.

[0039] S5, welding pre-deformation: according to the welding pre-deformation amount set in S4, the size of the flame tube wall tooling assembly position is measured and adjusted to ensure that the flame tube wall assembly position is larger than the theoretical assembly position, and the flame tube wall is assembled to the flame tube wall tooling to achieve welding pre-deformation;

[0040] The dimensions of the flame tube wall welding part are measured and repaired. Considering that the ring 4 has good rigidity and is not easy to deform, the shell 3 is pre-deformed separately, and the ring 1 and shell 2 are pre-deformed normally, and then Figure 1 Sequential assembly to Figure 2 To achieve welding pre-deformation.

[0041] S6, hot wire argon arc automatic welding of the flame tube wall: Use the ring hot wire argon arc automatic welding parameters determined in S2 to perform hot wire argon arc welding on the flame tube wall; after inspection, the weld quality meets the standard requirements.

[0042] S7, flame tube wall measurement: Dimensional measurement of the flame tube wall ring 1, shell 2, outer shell 3 and row ring 4 is performed. Comparing the measured dimensions before welding, the welding deformation does not exceed 0.3mm. The pre-deformation can well compensate for the welding shrinkage and meet the flame tube wall welding deformation control requirements.

[0043] The above description is only a preferred embodiment of the present invention and is 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

1. A method for controlling welding deformation of a high-temperature alloy ring flame tube wall, characterized in that: The following steps are involved: S1, determine the weld form: the structural weld form of the flame tube wall is a single-sided groove and double-sided forming form, and the groove form adopts a Y-shaped groove; S2, test the deformation of the hot wire argon arc automatic welding: design a hot wire argon arc automatic welding test piece, determine the hot wire argon arc automatic welding parameters, apply the same amount of preload force to both ends of the hot wire argon arc automatic welding test piece and the inner side of the test piece, detect the shrinkage of the hot wire argon arc automatic welding, and record the shrinkage data; S3, testing the pre-deformation pressure of the flame tube wall: using a pressure testing instrument to measure the pressure of different expansion amounts at the repair position of the flame tube wall, and record the pressure data; S4, setting of pre-deformation: comprehensively analyzing the deformation, pressure and shrinkage data of flame tube wall, determining the welding shrinkage through preload test, and setting the welding pre-deformation at the hot wire argon arc welding position of flame tube wall; S5, welding pre-deformation: according to the welding pre-deformation amount set in S4, the size of the flame tube wall tooling assembly position is measured and adjusted to ensure that the flame tube wall assembly position is larger than the theoretical assembly position, and the flame tube wall is assembled to the flame tube wall tooling to achieve welding pre-deformation; S6, hot wire argon arc automatic welding of the flame tube wall: hot wire argon arc automatic welding parameters determined in S2 are used to perform hot wire argon arc welding on the flame tube wall; S7, flame tube wall measurement: measure the dimensional parameters of the flame tube wall and compare them with the measured dimensions before welding. If the welding deformation does not exceed 0.3mm, the flame tube wall welding deformation control requirements are met.

2. A method for controlling deformation of high temperature alloy ring flame tube wall welding according to claim 1, characterized in that: The preload force applied at both ends of the hot wire argon arc automatic welding test piece in S2 is in the range of 1-2KN.

3. A method for controlling deformation of high temperature alloy ring flame tube wall welding according to claim 1, characterized in that: The welding deformation amount in S4 is less than or equal to the difference between the assembly position of the flame tube wall and the theoretical assembly position.

4. A method for controlling deformation of high temperature alloy ring flame tube wall welding according to claim 1, characterized in that: The flame tube wall assembly position in S5 is larger than the theoretical assembly position by a pre-deformation amount.

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