CN111283306A - Process for eliminating cracking tendency of argon arc welding seam of nickel-based stainless steel heat exchanger - Google Patents
Process for eliminating cracking tendency of argon arc welding seam of nickel-based stainless steel heat exchanger Download PDFInfo
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- CN111283306A CN111283306A CN202010172061.1A CN202010172061A CN111283306A CN 111283306 A CN111283306 A CN 111283306A CN 202010172061 A CN202010172061 A CN 202010172061A CN 111283306 A CN111283306 A CN 111283306A
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- nickel
- welded
- stainless steel
- argon arc
- arc welding
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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
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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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- 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
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses an argon arc welding seam cracking tendency eliminating process of a nickel-based stainless steel heat exchanger, which comprises the following steps of: 1) preheating a stainless steel workpiece to be welded; 2) coating brazing filler metal on the surface of a workpiece, and cleaning the workpiece to be welded before welding; 3) and products to be welded are welded by argon arc welding protection, an acrylic protective cover is adopted, and inert gas is continuously filled in the acrylic protective cover. The argon arc welding seam cracking tendency eliminating process for the nickel-based stainless steel heat exchanger reduces the welding temperature difference of the workpieces and prevents rapid cooling and rapid heating by preheating the stainless steel workpieces to be welded, enhances the welding seam strength and reduces the stress difference of the workpieces by cleaning and gas protection before welding the welded workpieces.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a process for eliminating cracking tendency of an argon arc welding seam of a nickel-based stainless steel heat exchanger.
Background
The stainless steel heat exchanger brazed by the nickel-based material has the advantages that the nickel-based material has certain characteristic change after high temperature, and more impurities are generated, so that a welding seam is easy to crack when a brazed core body and an end enclosure are welded, and finally, the product leakage is caused.
Disclosure of Invention
Aiming at the problems of the existing argon arc welding seam cracking tendency eliminating process of the nickel-based stainless steel heat exchanger, the invention provides an argon arc welding seam cracking tendency eliminating process of the nickel-based stainless steel heat exchanger.
In order to solve the technical problems, the invention adopts the technical scheme that:
an argon arc welding seam cracking tendency eliminating process for a nickel-based stainless steel heat exchanger, wherein the argon arc welding seam cracking tendency eliminating process comprises the following steps: the method comprises the following steps:
1) preheating a stainless steel workpiece to be welded;
2) coating brazing filler metal on the surface of a workpiece, and cleaning the workpiece to be welded before welding;
3) and products to be welded are welded by argon arc welding protection, an acrylic protective cover is adopted, and inert gas is continuously filled in the acrylic protective cover.
Preferably, the argon arc welding seam cracking tendency eliminating process for the nickel-based stainless steel heat exchanger is characterized in that the preheating temperature in the step 1) is 300-350 ℃.
Preferably, the argon arc welding seam cracking tendency eliminating process for the nickel-based stainless steel heat exchanger, wherein the cleaning before welding in the step 2) is specifically as follows: and grinding and polishing the part to be welded on the surface of the workpiece, and removing the residual impurities of the nickel-based brazing filler metal.
Preferably, the argon arc welding seam cracking tendency eliminating process of the nickel-based stainless steel heat exchanger is characterized in that the inert gas in the step 3) is argon, and the purity of the argon is more than or equal to 99.95%.
Preferably, the argon arc welding seam cracking tendency eliminating process of the nickel-based stainless steel heat exchanger is characterized in that brazing filler metal used for argon arc welding is nickel-based brazing filler metal, and the nickel-based brazing filler metal comprises the following components in parts by weight:
Ni 35.0～45.0；Cr 4.0～8.0；B 6.0～8.0；Mn 5.0～10.0；Si 5.0～10.0；Cu12.0～15.0；Fe 5.0～10.0；Mo 3.0～6.0；W 2.0～4.0；Co0.5～2.0。
has the advantages that:
the argon arc welding seam cracking tendency eliminating process for the nickel-based stainless steel heat exchanger reduces the welding temperature difference of the workpieces and prevents rapid cooling and rapid heating by preheating the stainless steel workpieces to be welded, enhances the welding seam strength and reduces the stress difference of the workpieces by cleaning and gas protection before welding the welded workpieces.
Detailed Description
The following examples further illustrate embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides an argon arc welding seam cracking tendency eliminating process of a nickel-based stainless steel heat exchanger, which comprises the following steps: the method comprises the following steps:
1) preheating a stainless steel workpiece to be welded; because the temperature of argon arc welding is as high as 1400 ℃, when the part is welded with normal temperature at the instant high temperature, the welding seam is easy to crack because of rapid cooling and rapid heating, so that the temperature difference caused by preheating the workpiece is reduced to crack; 2) coating brazing filler metal on the surface of a workpiece, and cleaning the workpiece to be welded before welding; particularly, the parts to be welded on the surface of the core workpiece are ground and polished, and the impurities remained in the nickel-based brazing filler metal are removed, so that a clean environment is provided for argon arc welding; 3) and products to be welded are welded by argon arc welding protection, an acrylic protective cover is adopted, and inert gas is continuously filled in the acrylic protective cover. The conventional argon arc welding is inert gas argon arc protection welding, so that the welding seam is prevented from being oxidized to cause low strength of the welding seam and cracking in the vibration process, and the stainless steel heat exchanger is also subjected to argon arc protection welding, but the content of argon gas sprayed by a conventional argon arc welding gun is extremely low, and the antioxidation effect of the surface welding seam cannot be met; therefore, the transparent acrylic protective cover is adopted, and inert gas argon is continuously filled into the transparent acrylic protective cover, so that a better atmosphere is provided for the welding line, the surface oxidation of the welding line is delayed, the strength of the welding line is enhanced, and the cracking is reduced.
As another embodiment of the present disclosure, the preheating temperature in step 1) is 300 to 350 ℃.
As another embodiment of the present disclosure, the pre-welding cleaning in step 2) specifically includes: and grinding and polishing the part to be welded on the surface of the workpiece, and removing the residual impurities of the nickel-based brazing filler metal.
As another embodiment of the scheme, the inert gas in the step 3) is argon, and the purity of the argon is more than or equal to 99.95%.
As another embodiment of the present disclosure, the brazing filler metal used in argon arc welding is a nickel-based brazing filler metal, and the nickel-based brazing filler metal comprises the following components in parts by weight:
Ni 35.0～45.0；Cr 4.0～8.0；B 6.0～8.0；Mn 5.0～10.0；Si 5.0～10.0；Cu12.0～15.0；Fe 5.0～10.0；Mo 3.0～6.0；W 2.0～4.0；Co0.5～2.0。
specific examples and comparative examples are listed below:
example 1:
1) preheating a stainless steel workpiece to be welded, wherein the preheating temperature is 300 ℃;
2) coating brazing filler metal on the surface of a workpiece, cleaning the workpiece to be welded before welding, grinding and polishing the part, needing to be welded, on the surface of the workpiece, and removing impurities remained in the nickel-based brazing filler metal;
3) and products to be welded are welded by argon arc welding protection, an acrylic protective cover is adopted, and inert gas is continuously filled in the acrylic protective cover.
And 3) taking argon as inert gas, wherein the purity of the argon is more than or equal to 99.95%, and taking nickel-based brazing filler metal as brazing filler metal used in argon arc welding, wherein the nickel-based brazing filler metal comprises the following components in parts by weight: ni 40.0; cr 5.0; b6.0; mn is 10.0; si10.0; 12.0 of Cu; fe5.0; mo 6.0; w4.0; and 2.0 of Co.
Example 2:
1) preheating a stainless steel workpiece to be welded, wherein the preheating temperature is 320 ℃;
2) coating the brazing filler metal on the surface of a workpiece, and performing pre-welding cleaning on the workpiece to be welded, wherein the pre-welding cleaning specifically comprises the following steps: grinding and polishing the part to be welded on the surface of the workpiece, and removing the residual impurities of the nickel-based brazing filler metal;
3) argon arc welding is adopted for products to be welded, an acrylic protective cover is adopted, inert gas is continuously filled into the product, the inert gas is argon, and the purity of the argon is more than or equal to 99.95 percent;
the brazing filler metal used for argon arc welding is nickel-based brazing filler metal, and the nickel-based brazing filler metal comprises the following components in parts by weight:
Ni 35.0；Cr 8.0；B 8.0；Mn 10.0；Si 8.0；Cu 13.0；Fe 8.0；Mo 6.0；W 2.0；Co2.0。
example 3:
1) preheating a stainless steel workpiece to be welded, wherein the preheating temperature is 350 ℃;
2) coating the brazing filler metal on the surface of a workpiece, and performing pre-welding cleaning on the workpiece to be welded, wherein the pre-welding cleaning specifically comprises the following steps: grinding and polishing the part to be welded on the surface of the workpiece, and removing the residual impurities of the nickel-based brazing filler metal;
3) argon arc welding is adopted for products to be welded, an acrylic protective cover is adopted, inert gas is continuously filled into the product, the inert gas is argon, and the purity of the argon is more than or equal to 99.95 percent;
the brazing filler metal used for argon arc welding is nickel-based brazing filler metal, and the nickel-based brazing filler metal comprises the following components in parts by weight:
Ni 45.0；Cr 4.0；B 7.0；Mn 6.0；Si 6.0；Cu 15.0；Fe 10.0；Mo 3.0；W3.0；Co1.0。
the invention reduces the welding temperature difference of the workpieces and prevents rapid cooling and rapid heating by preheating the stainless steel workpieces to be welded, enhances the strength of welding seams and reduces the stress difference of the workpieces by cleaning and gas protection before welding the welded workpieces.
The embodiments of the present invention have been described in detail with reference to the examples, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (5)
1. A technology for eliminating cracking tendency of an argon arc welding seam of a nickel-based stainless steel heat exchanger is characterized by comprising the following steps of: the method comprises the following steps:
1) preheating a stainless steel workpiece to be welded;
2) coating brazing filler metal on the surface of a workpiece, and cleaning the workpiece to be welded before welding;
3) and products to be welded are welded by argon arc welding protection, an acrylic protective cover is adopted, and inert gas is continuously filled in the acrylic protective cover.
2. The argon arc welding seam cracking tendency eliminating process for the nickel-based stainless steel heat exchanger according to claim 1, wherein the preheating temperature in the step 1) is 300-350 ℃.
3. The argon arc weld cracking tendency eliminating process for the nickel-based stainless steel heat exchanger according to claim 1, wherein the pre-welding cleaning in the step 2) is specifically as follows: and grinding and polishing the part to be welded on the surface of the workpiece, and removing the residual impurities of the brazing filler metal.
4. The argon arc welding seam cracking tendency eliminating process for the nickel-based stainless steel heat exchanger according to claim 1, wherein the inert gas in the step 3) is argon, and the purity of the argon is more than or equal to 99.95%.
5. The argon arc welding seam cracking tendency eliminating process of the nickel-based stainless steel heat exchanger according to claim 1, wherein the brazing filler metal used for argon arc welding is a nickel-based brazing filler metal, and the nickel-based brazing filler metal comprises the following components in parts by weight:
Ni 35.0～45.0；Cr 4.0～8.0；B 6.0～8.0；Mn 5.0～10.0；Si 5.0～10.0；Cu 12.0～15.0；Fe 5.0～10.0；Mo 3.0～6.0；W 2.0～4.0；Co 0.5～2.0。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010172061.1A CN111283306A (en) | 2020-03-12 | 2020-03-12 | Process for eliminating cracking tendency of argon arc welding seam of nickel-based stainless steel heat exchanger |
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| CN202010172061.1A CN111283306A (en) | 2020-03-12 | 2020-03-12 | Process for eliminating cracking tendency of argon arc welding seam of nickel-based stainless steel heat exchanger |
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Citations (8)
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|---|---|---|---|---|
| CN101774062A (en) * | 2009-12-30 | 2010-07-14 | 山东大学 | Lamination composite material and stainless steel argon arc melt-brazing method |
| CN103079752A (en) * | 2010-09-13 | 2013-05-01 | 福田金属箔粉工业株式会社 | Nickel-based hydrochloric acid corrosion resistant alloy for soldering |
| CN105189030A (en) * | 2014-04-11 | 2015-12-23 | 福田金属箔粉工业株式会社 | Nickel brazing filler metal having exceptional corrosion resistance |
| CN105397222A (en) * | 2015-12-16 | 2016-03-16 | 郑州机械研究所 | Flame preheating tungsten electrode argon arc brazing method |
| CN105750697A (en) * | 2014-12-15 | 2016-07-13 | 无锡市普尔换热器制造有限公司 | Titanium alloy heat exchanger argon arc welding technology |
| CN105817749A (en) * | 2016-05-27 | 2016-08-03 | 中国海洋石油总公司 | Automatic tungsten inert gas (TIG) argon arc welding process for stainless steel pipelines |
| CN107570843A (en) * | 2017-09-13 | 2018-01-12 | 无锡市普尔换热器制造有限公司 | A kind of repair welding for preventing weld cracking |
| CN107875707A (en) * | 2017-12-21 | 2018-04-06 | 新乡市天诚航空净化设备有限公司 | A kind of tank fluid path filter element and its welding method |
-
2020
- 2020-03-12 CN CN202010172061.1A patent/CN111283306A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774062A (en) * | 2009-12-30 | 2010-07-14 | 山东大学 | Lamination composite material and stainless steel argon arc melt-brazing method |
| CN103079752A (en) * | 2010-09-13 | 2013-05-01 | 福田金属箔粉工业株式会社 | Nickel-based hydrochloric acid corrosion resistant alloy for soldering |
| CN105189030A (en) * | 2014-04-11 | 2015-12-23 | 福田金属箔粉工业株式会社 | Nickel brazing filler metal having exceptional corrosion resistance |
| CN105750697A (en) * | 2014-12-15 | 2016-07-13 | 无锡市普尔换热器制造有限公司 | Titanium alloy heat exchanger argon arc welding technology |
| CN105397222A (en) * | 2015-12-16 | 2016-03-16 | 郑州机械研究所 | Flame preheating tungsten electrode argon arc brazing method |
| CN105817749A (en) * | 2016-05-27 | 2016-08-03 | 中国海洋石油总公司 | Automatic tungsten inert gas (TIG) argon arc welding process for stainless steel pipelines |
| CN107570843A (en) * | 2017-09-13 | 2018-01-12 | 无锡市普尔换热器制造有限公司 | A kind of repair welding for preventing weld cracking |
| CN107875707A (en) * | 2017-12-21 | 2018-04-06 | 新乡市天诚航空净化设备有限公司 | A kind of tank fluid path filter element and its welding method |
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Application publication date: 20200616 |