CN113547188A - Welding process of high-temperature alloy with high Al and Ti contents - Google Patents
Welding process of high-temperature alloy with high Al and Ti contents Download PDFInfo
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- CN113547188A CN113547188A CN202110916450.5A CN202110916450A CN113547188A CN 113547188 A CN113547188 A CN 113547188A CN 202110916450 A CN202110916450 A CN 202110916450A CN 113547188 A CN113547188 A CN 113547188A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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Abstract
The project provides a welding process of high-temperature alloy with high Al and Ti contents. The high Al and Ti content high temperature alloy has poor weldability, and cracks are easy to generate during welding, so that the performance is low. This patent adopts tungsten electrode argon arc welding (TIG) to weld high Al, Ti superalloy, and welding process is: the method is characterized in that the welding wire is made of HGH3113 materials with the diameter of 1.6mm, the pre-welding treatment is overaging for three times, the heat preservation is carried out for 8 hours at 850 ℃, the preheating temperature is 500-800 ℃, the welding current is 30-50A, the argon flow is 12-16L/min, and the solution treatment of heat preservation at 1150 ℃ for 2 hours and the aging treatment of heat preservation at 850 ℃ for 24 hours are carried out after welding. After welding, the hardness of the welding seam area can reach 442.15 HV. The method has simple process, excellent performance after welding and no crack, and provides a new direction for the welding research and the application of the high-temperature alloy material with high Al and Ti content.
Description
Technical Field
The invention belongs to the welding category, relates to a welding process, and particularly relates to a welding process of a high-temperature alloy with high Al and Ti contents.
Background
The welding process is a coupling mode for generating mutual diffusion on an atomic layer surface between two welding objects so as to form metallurgical bonding, and is mainly realized by heating, pressurizing or the combination of the heating and the pressurizing. Welding is the mainstream mode of high-temperature alloy defect repair at present, and by selecting a proper welding process and a pre-welding and post-welding heat treatment mode and adjusting welding parameters, the repaired structure can reach the required performance, so that the casting can be put into use again. Now more and more scientists have realized the importance of developing the repair technology of high-temperature alloy defects, and a large number of researchers have experimented on the process parameters of different welding processes, the selection of welding flux and the like and studied the influence of the different welding processes on the microstructure and the mechanical property of a welding joint so as to recover the service performance and prolong the service life of the welding joint. However, the existing high Al and Ti content high temperature alloy has poor weldability, and cracks are easily generated during welding, namely solidification cracks, liquefaction cracks and strain aging cracks, so that the performance of the alloy is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the high Al and Ti content high temperature alloy has poor weldability, and cracks are easy to generate during welding, so that the performance of the alloy is low.
In order to solve the problems, the technical scheme of the invention is that a welding process of high-Al and Ti content high-temperature alloy adopts Tungsten Inert Gas (TIG) welding to weld the high-Al and Ti high-temperature alloy, and the welding process comprises the following steps: the method is characterized in that the welding wire is made of HGH3113 materials with the diameter of 1.6mm, the pre-welding treatment is overaging for three times, the temperature is 850 ℃ and the heat preservation is 8 hours, the preheating temperature is 500-800 ℃, the welding current is 30-50A, the argon flow is 12-16L/min, and after welding, the solution treatment of heat preservation at 1150 ℃ for 2 hours and the aging treatment of heat preservation at 850 ℃ for 24 hours are carried out.
The invention provides a welding process of a high-temperature alloy with high Al and Ti contents. The HGH3113 with the diameter of 1.6mm is selected as the welding wire, because the invention takes the high-temperature alloy with high Al and Ti contents as an example, the Al and Ti contents of the welding wire are very small, and the gamma' phase can not be separated out in the solidification and cooling processes, thereby eliminating the shrinkage strain generated when the solder is solidified.
The invention provides a welding process of a high-Al and Ti content high-temperature alloy, after the welding process is carried out on the high-Al and Ti content high-temperature alloy, the hardness of a welding seam area can reach 442.15HV, the repaired structure can reach the required performance, and a casting can be put into use again. The method has simple process, excellent performance after welding and no crack, and provides a new direction for the welding research and the application of the high-temperature alloy material with high Al and Ti content.
The welding process flow diagram is shown in fig. 1. The structure of each region after weld repair, the appearance after weld, and the flaw detection results were excellent in structure properties and free from cracks, as shown in fig. 2 and 3.
Drawings
Fig. 1 is a flow chart of a welding process of embodiment 1 of the present invention.
Fig. 2 is a structure diagram of each region after weld repair in example 1 of the present invention.
FIG. 3 is a graph showing the appearance and flaw detection results of the test specimens of example 1 of the present invention after welding.
Detailed Description
Example 1
K438 high-temperature alloy is used as a base material for experiments. The specific process comprises the following steps: the K438 high-temperature alloy is welded by adopting argon tungsten-arc welding (TIG), the HGH3113 material with the diameter of 1.6mm is selected as the welding wire, the Al and Ti contents of the welding wire are very low, and a gamma' phase cannot be separated out in the solidification and cooling processes, so that the shrinkage strain generated by the solidification of the welding flux is eliminated. Before welding, overaging treatment is carried out for three times, and the temperature is kept at 850 ℃ for 8 hours, so that the weldability of the alloy is improved. Preheating temperature is 700 ℃, welding current is 50A, argon flow is 15L/min, solid solution treatment of heat preservation for 2 hours at 1150 ℃ and aging treatment of heat preservation for 24 hours at 850 ℃ are carried out after welding, and stress release of the sample is facilitated.
After the welding of the sample 1 is completed, the hardness of the welded joint is tested to obtain the hardness values of different areas of the welded joint, as shown in table 1. A flow chart of the welding process, as shown in fig. 1. The structure of each region after weld repair, base material region (SZ), Heat Affected Zone (HAZ), fusion zone (PMZ), and repair Region (RZ), is shown in fig. 2. The appearance and flaw detection results of the test pieces after welding were shown in FIG. 3, showing no cracks.
Table 1 sample 1 different weld zone hardness values
Example 2
K438 high-temperature alloy is used as a base material for experiments. The specific process comprises the following steps: the K438 high-temperature alloy is welded by adopting argon tungsten-arc welding (TIG), the HGH3113 material with the diameter of 1.6mm is selected as the welding wire, the Al and Ti contents of the welding wire are very low, and a gamma' phase cannot be separated out in the solidification and cooling processes, so that the shrinkage strain generated by the solidification of the welding flux is eliminated. Before welding, overaging treatment is carried out for three times, and the temperature is kept at 850 ℃ for 8 hours, so that the weldability of the alloy is improved. Preheating temperature is 700 ℃, welding current is 40A, argon flow is 15L/min, solid solution treatment of heat preservation for 2 hours at 1150 ℃ and aging treatment of heat preservation for 24 hours at 850 ℃ are carried out after welding, and stress release of the sample is facilitated.
After the welding of the sample 2 is completed, the hardness of the welded joint is tested to obtain the hardness values of different areas of the welded joint, as shown in table 2.
Table 2 hardness values for different weld zones of sample 2
Embodiment 3
K438 high-temperature alloy is used as a base material for experiments. The specific process comprises the following steps: the K438 high-temperature alloy is welded by adopting argon tungsten-arc welding (TIG), the HGH3113 material with the diameter of 1.6mm is selected as the welding wire, the Al and Ti contents of the welding wire are very low, and a gamma' phase cannot be separated out in the solidification and cooling processes, so that the shrinkage strain generated by the solidification of the welding flux is eliminated. Before welding, overaging treatment is carried out for three times, and the temperature is kept at 850 ℃ for 8 hours, so that the weldability of the alloy is improved. Preheating temperature is 600 ℃, welding current is 40A, argon flow is 15L/min, solid solution treatment of heat preservation for 2 hours at 1150 ℃ and aging treatment of heat preservation for 24 hours at 850 ℃ are carried out after welding, and stress release of the sample is facilitated.
After the welding of the sample 3 is completed, the hardness of the welded joint is tested to obtain the hardness values of different areas of the welded joint, as shown in table 3.
Table 3 sample 3 different weld zone hardness values
The welding process of this patent does: the method is characterized in that the welding wire is made of HGH3113 materials with the diameter of 1.6mm, the pre-welding treatment is overaging for three times, the temperature is 850 ℃ and the heat preservation is 8 hours, the preheating temperature is 500-800 ℃, the welding current is 30-50A, the argon flow is 12-16L/min, and after welding, the solution treatment of heat preservation at 1150 ℃ for 2 hours and the aging treatment of heat preservation at 850 ℃ for 24 hours are carried out. After welding is finished, no crack is generated, the performance of the welding rod reaches the generation requirement, and the hardness of the welding seam area can reach 442.15 HV. Provides a new direction for the welding research and the application of the high-Al and Ti high-temperature alloy material.
Claims (5)
1. A welding process for high-temp alloy with high Al and Ti contents features that before welding, it is overaged three times and then insulated at 850 deg.C for 8 hr.
2. The welding process of claim 1, wherein the preheating temperature is 500-800 ℃, the welding current is 30-50A, and the argon flow is 12-16L/min.
3. A process for welding a high Al, Ti content superalloy as in claim 1 or 2, wherein the wire is selected from the group consisting of HGH3113 with a diameter of 1.6 mm.
4. A welding process of high Al, Ti content high temperature alloy as claimed in claim 1, 2 or 3, characterized in that after welding, solution treatment of 1150 ℃ for 2 hours and aging treatment of 850 ℃ for 24 hours are carried out.
5. The welding process of the high Al and Ti content superalloy as in claim 1, 2, 3 or 4, wherein after the high Al and Ti content superalloy is welded, the hardness of a weld zone can reach 442.15 HV.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5509980A (en) * | 1994-08-17 | 1996-04-23 | National University Of Singapore | Cyclic overageing heat treatment for ductility and weldability improvement of nickel-based superalloys |
| WO2015010200A1 (en) * | 2013-07-24 | 2015-01-29 | University Of Manitoba | Pre-weld heat treatment of y' precipitation strengthened nickel-based superalloys |
| CN105026581A (en) * | 2013-02-22 | 2015-11-04 | 西门子股份公司 | Pre-weld heat treatment for a nickel based superalloy |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5509980A (en) * | 1994-08-17 | 1996-04-23 | National University Of Singapore | Cyclic overageing heat treatment for ductility and weldability improvement of nickel-based superalloys |
| CN105026581A (en) * | 2013-02-22 | 2015-11-04 | 西门子股份公司 | Pre-weld heat treatment for a nickel based superalloy |
| WO2015010200A1 (en) * | 2013-07-24 | 2015-01-29 | University Of Manitoba | Pre-weld heat treatment of y' precipitation strengthened nickel-based superalloys |
Non-Patent Citations (6)
| Title |
|---|
| 《工程材料实用手册》编辑委员会: "《工程材料实用手册 第2卷 变形高温合金 铸造高温合金 第2版》", 31 August 2002, 中国标准出版社 * |
| 宋文清等: "K4104合金涡轮导向叶片的补焊技术", 《焊接技术》 * |
| 机械工程手册编辑委员会: "《机械工程手册 第二版 机械制造工艺及设备卷（一）》", 31 August 1996, 机械工业出版社 * |
| 王广生 等: "《金属热处理缺陷分析及案例》", 31 December 1997, 机械工业出版社 * |
| 王运会 等: "高温合金材料电子束焊应变时效裂纹问题研究及其热处理工艺改进", 《第十届全国典型零件热处理学术及技术交流会暨第七届全国热处理学会物理冶金学术交流会论文集》 * |
| 雷廷权 等: "《金属热处理工艺方法500种》", 30 September 1998, 机械工业出版社 * |
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