CN113927193A - Novel combined large-penetration welding method for thick plate copper alloy - Google Patents
Novel combined large-penetration welding method for thick plate copper alloy Download PDFInfo
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- CN113927193A CN113927193A CN202111270311.6A CN202111270311A CN113927193A CN 113927193 A CN113927193 A CN 113927193A CN 202111270311 A CN202111270311 A CN 202111270311A CN 113927193 A CN113927193 A CN 113927193A
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- 238000003466 welding Methods 0.000 title claims abstract description 199
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000013543 active substance Substances 0.000 claims abstract description 40
- 230000035515 penetration Effects 0.000 claims abstract description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000011247 coating layer Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- BHHYHSUAOQUXJK-UHFFFAOYSA-L zinc fluoride Chemical compound F[Zn]F BHHYHSUAOQUXJK-UHFFFAOYSA-L 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 7
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
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- 239000011248 coating agent Substances 0.000 abstract description 6
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- 239000007769 metal material Substances 0.000 abstract description 2
- 230000004927 fusion Effects 0.000 description 7
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
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- 229910052751 metal Inorganic materials 0.000 description 2
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/12—Copper or alloys thereof
Abstract
The invention discloses a novel combined large-penetration welding method for thick plate copper alloy, and belongs to the technical field of metal material welding. The method comprises the steps of coating an active agent on a to-be-welded part of a copper alloy plate before welding, and realizing one-time penetration of a medium plate (the thickness of the plate is more than or equal to 3mm and less than 10 mm) by using a larger perforation welding current; a combined groove is designed for a copper alloy plate with the thickness of more than 10mm, and a welding mode combining one-time penetration and multi-layer and multi-channel melting is adopted, so that the welding method can improve the thick plate welding efficiency, guarantee high-quality deep melting welding of a welding seam, improve the welding quality, save welding seam filling materials, and effectively control the weight of a structural part and the welding deformation.
Description
Technical Field
The invention belongs to the technical field of metal material welding, and particularly relates to a novel combined large-penetration welding method for thick plate copper alloy.
Background
The copper alloy with excellent thermal conductivity, ductility and corrosion resistance is widely applied to the industrial fields of marine ships, petrochemical industry, aerospace, container manufacturing, nuclear power equipment and the like, and the welding requirement of the copper alloy thick plate is increasingly outstanding. On one hand, in a complex working condition environment, the requirements on the space and the weight of equipment are very strict, and a thick plate cannot be formed once to obtain a welding line with satisfactory quality by adopting a traditional TIG (non-consumable inert gas) welding method or a MIG (metal inert gas) welding method; on the other hand, in the fields of ships, ocean engineering, petrochemical engineering and the like, with the application of medium and heavy plates of large-sized components, TIG (tungsten inert gas) and MIG (metal-inert gas) welding methods are commonly used for copper alloys at present, the thick plates need multilayer multi-pass welding, the welding deformation is large due to large heat input, the defects such as air holes and the like are easy to occur in wire filling welding, the welding efficiency is low, the joint forming quality is reduced, and the product production progress is seriously influenced.
At present, the main difficulties of copper alloy welding are as follows: due to the high thermal conductivity of the copper alloy, the welding deformation is large, the heat conduction is fast in the welding process, the filler wire in the welding seam area cannot be fused with the base metal well, the defects of welding air holes, non-fusion and the like are easy to generate, the welding seam penetration achievable by the conventional welding method is limited, and the good forming of the welding of the medium plate is difficult to achieve.
Disclosure of Invention
The invention aims to provide a novel combined large-penetration welding method for thick plate copper alloy, which adopts a K-TIG (deep-penetration TIG welding) and A-TIG (activated TIG welding) large-penetration combined welding technology to realize efficient deep-fusion welding of the thick plate copper alloy, improve the welding quality, save the cost and control the weight and the welding deformation of a structural member.
In order to achieve the purpose, the invention adopts the technical scheme that: a novel combined large-penetration welding method for thick plate copper alloy comprises the following steps:
s1, groove machining is carried out on the copper alloy plate to be welded: when the thickness of the plate is more than or equal to 3mm and less than 10mm, an I-shaped straight-edge groove is adopted; when the thickness of the plate is not less than 10mm and not more than 15mm, a Y-shaped combined groove is adopted, and the truncated edge is 8-10 mm; when the plate thickness is more than 15mm and less than or equal to 20mm, an I-shaped straight edge and U-shaped combined groove is adopted, and the truncated edge is 8-10 mm;
s2, cleaning the area to be welded, and assembling and fixing the assembly;
s3, uniformly mixing an active agent suitable for A-TIG welding with acetone or absolute ethyl alcohol, uniformly brushing the active agent on the to-be-welded area cleaned in the step S2 by using a brush, and drying a coating layer;
s4, placing the copper alloy plate processed in the step S3 under a K-TIG welding gun for welding: the butt joint position of the I-shaped straight-edge groove and the blunt edge of the combined groove adopts self-fluxing welding, the welding current is 500-900A, and the welding speed is 200-400 mm/min; and the narrow gap positions of the Y-shaped combined groove and the U-shaped groove are deposited by adopting K-TIG.
Furthermore, a pointed tungsten electrode is adopted by the K-TIG welding gun, and a nozzle of the K-TIG welding gun is perpendicular to the butt welding seam position of the welded piece. In the step S4, the K-TIG cladding adopts high-current wire feeding filling, the heat input is large, the cladding quantity is large, and the narrow-gap welding efficiency is high.
Further, the active agent is mainly formed by mixing oxide and fluoride, and the preferable active agent component comprises SiO2、CaF2And ZnF2。
Further, when an I-shaped straight-edge groove is adopted, the technological parameters of K-TIG welding are as follows:
when the thickness of the plate is more than or equal to 3mm and less than 8mm, the welding current is 500-700A, and the welding speed is 300-400 mm/min;
when the thickness of the plate is more than or equal to 8mm and less than 10mm, the welding current is 600-900A, and the welding speed is 200-400 mm/min;
for the butt joint position of the truncated edge of the combined groove, the technological parameters of K-TIG welding are as follows:
the welding current is 700-900A, and the welding speed is 200-300 mm/min.
Further, the regions to be welded are mechanically cleaned in step S2, and the cleaning area: two end faces of the I-shaped straight edge groove and two sides of the welding seam; the blunt end face, the bevel edge region and both sides of the weld of the combined groove. The assembly gap is less than 1.5mm, and the misalignment is less than 1 mm. And spot welding or mechanical fixing is carried out after assembly.
Further, in step S3, the mixing ratio of the active agent to acetone or absolute ethyl alcohol is: 10-20 g of active agent is added to each 100ml of acetone or absolute ethyl alcohol. The thickness of the coating layer is 0.5-1.2 mm.
Further, the process parameters of K-TIG welding in step S4 are: the current is 300-400A, the deposition speed is 300-400 mm/min, and the diameter of the welding wire is 3.0 mm.
Furthermore, the protective gas in the welding process is high-purity argon, and the flow of the protective gas is 20-30L/min.
By adopting the technical scheme, the application can achieve the following beneficial effects: (1) the method adopts a K-TIG and A-TIG combined welding method to realize the high-efficiency deep fusion welding of the thick plate copper alloy; because the welding area is coated with the active agent, the welding energy and heat are expanded to the depth direction of the molten pool, the welding penetration is greatly improved, the fusion width difference of the welding line in the depth direction is reduced, and the welding deformation of the copper alloy component is reduced; the K-TIG and A-TIG welding can also effectively regulate and control the welding arc form and ensure the stability of the perforation.
(2) For a copper alloy plate with the thickness of not less than 3mm and less than 10mm, an active agent coating and K-TIG self-fluxing welding method is adopted, the welding heat is more concentrated by increasing the welding current, the large-fusion-depth one-time penetration of butt welding seams is realized, the welding efficiency of medium plates is effectively improved, the defect generation rate in the welding process is reduced, the weight of a structural part and the welding deformation are controlled, and the welding quality is improved; in addition, the copper alloy plate with the thickness less than 10mm is not provided with a welding gap and a welding wire, so that the cost is saved.
(3) For the copper alloy plate with the thickness of not less than 10mm and not more than 20mm, the high-quality and high-efficiency welding of the large and thick plate is realized by designing a joint form. The narrow gap position of the copper alloy plate combined groove is coated with an active agent and then subjected to K-TIG deposition, and a larger welding current is adopted, so that the single-pass deposition amount is larger than that of common TIG and MIG welding, and the side wall fusion is better; the form of the butt weld joint combined groove is designed, one-time penetration and multi-layer and multi-channel melting are combined in welding, so that the welding workload can be reduced, the welding efficiency is improved, and the problem that the process window of the qualified weld joint of the medium plate is narrow is solved.
(4) By the combined welding of K-TIG and A-TIG, the welding current and welding heat input adopted in the whole process are relatively small, and the cost is further reduced.
(5) Due to the decomposition effect of the active agent under the high temperature of the electric arc, the cleaning effect on non-pure substances in the weld metal is achieved, and the performance of a welding joint can be improved.
Drawings
FIG. 1 is a technical schematic view of a novel combined large penetration welding method for thick plate copper alloy according to the present application;
FIG. 2 is a schematic structural view of an I-shaped straight groove of the present application;
FIG. 3 is a schematic structural view of a Y-shaped combined groove of the present application;
FIG. 4 is a schematic structural view of a combined groove of a straight side and a U-shaped groove of the present application;
FIG. 5 is a topographical view of a copper alloy (8 mm) weld joint of example 1 of the present application;
FIG. 6 is a cross-sectional metallographic view of the weld of FIG. 5;
FIG. 7 is a topographical view of a copper alloy (15 mm) weld joint of example 3 of the present application.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The application provides a novel combined large-penetration welding method for thick plate copper alloy, which combines two welding methods and two welding processes based on K-TIG and A-TIG combined welding technologies, carries out welding aiming at copper alloy plates with different thicknesses, greatly reduces welding current on the whole, reduces welding heat input, improves perforation stability, widens a welding process window, reduces the welding workload and deformation of the thick plate, improves welding efficiency, controls the weight of a structural part, and realizes large-penetration good forming of the thick plate.
As shown in figure 1, an A-TIG active agent is coated on a to-be-welded area 1 of a to-be-welded copper alloy plate 2, a K-TIG welding gun is perpendicular to the upper side of a welding joint, the tip of a tungsten electrode of the welding gun is arranged right above a to-be-welded position and is 0.8-2 mm away from an active agent coating layer, and the medium and thick plate copper alloy is welded by adopting a K-TIG and A-TIG combined welding method.
Example 1
A novel combined large-penetration welding method for thick plate copper alloy comprises the following steps:
(1) selecting a B10 copper alloy welding test plate, wherein the size of the test plate is 150mm multiplied by 250mm multiplied by 8mm, and the joint adopts an I-shaped straight groove; and polishing the joint, cleaning oil stain by using acetone, and drying. The specific structure is shown in fig. 2.
(2) Aligning two prepared copper alloy welding test plates along the length direction of 250mm, and carrying out welding assembly to ensure that the assembly gap is less than or equal to 0.5mm and the misalignment is less than or equal to 0.2 mm; and spot welding is adopted for fixing.
(3) Mixing an active agent with absolute ethyl alcohol according to the mixing ratio: 10-20 g of active agent is added to each 100ml of absolute ethyl alcohol. The active agent comprises SiO as the main component2、CaF2、ZnF2. And uniformly coating the active agent on the surface of the part to be welded by using a clean brush. And (3) the thickness of the active agent coating layer is 0.5-1.2 mm, and welding is carried out after the coating layer is dried.
(4) And placing the treated copper alloy plate under a K-TIG welding gun to realize one-time fusion penetration of the copper alloy with the thickness of 8mm in combined welding. Selecting a welding process specification: the voltage is 18V, the current is 600A, the welding speed is 300mm/min, the welding gas and the back protective gas are both high-purity argon, and the front surface covering treatment is carried out after welding to ensure the formation of a welding seam. The welded joint topography is shown in FIG. 5, and the weld cross-section metallography is shown in FIG. 6.
In the embodiment, the large-penetration one-step penetration of the butt weld is realized by the combined welding of K-TIG and A-TIG, the welding efficiency of the medium plate is effectively improved, the weight of the structural part and the welding deformation can be controlled, and the welding quality is improved; no welding wire is added, and the cost is saved.
Example 2
A novel combined large-penetration welding method for thick plate copper alloy comprises the following steps:
(1) selecting a B10 copper alloy welding test plate, wherein the size of the test plate is 150mm multiplied by 200mm multiplied by 3mm, and the joint adopts an I-shaped straight groove; and polishing the joint, cleaning oil stain by using acetone, and drying.
(2) Aligning two prepared copper alloy welding test plates along the length direction of 200mm, and carrying out welding assembly to ensure that the assembly gap is less than or equal to 0.5mm and the misalignment is less than or equal to 0.2 mm; mechanical fixation is adopted.
(3) Mixing an active agent and acetone according to the following mixing ratio: 15g of active agent per 100ml of acetone was added. The active agent comprises SiO as the main component2、CaF2、ZnF2. And uniformly coating the active agent on the surface of the part to be welded by using a clean brush. And (3) the thickness of the active agent coating layer is 0.5-1.2 mm, and welding is carried out after the coating layer is dried.
(4) And (3) placing the treated copper alloy plate under a K-TIG welding gun, wherein the K-TIG welding gun is vertical to the upper part of the joint, and realizing one-time fusion penetration of the copper alloy with the thickness of 3mm in combined welding. Selecting a welding process specification: the voltage is 18V, the current is 500A, the welding speed is 400mm/min, the welding gas and the back protective gas are high-purity argon, and the front surface covering treatment is carried out after welding to ensure the formation of a welding seam.
Example 3
A novel combined large-penetration welding method for thick plate copper alloy comprises the following steps:
(1) a B10 copper alloy welding test plate is selected, and the size of the test plate is 150mm multiplied by 200mm multiplied by 15 mm. The joint adopts a Y-shaped combined groove; and polishing the joint, cleaning oil stain by using acetone, and drying. Wherein, the length of the truncated edge of the Y-shaped combined groove is 10 mm. The schematic diagram of the Y-shaped combined groove is shown in FIG. 3.
(2) Aligning two prepared copper alloy welding test plates along the length direction of 150mm, and carrying out welding assembly to ensure that the assembly gap is less than or equal to 0.5mm and the misalignment is less than or equal to 0.2 mm; and spot welding is adopted for fixing.
(3) Mixing an active agent and acetone according to the following mixing ratio: 10g of active agent per 100ml of acetone was added. The active agent comprises SiO as the main component2、CaF2、ZnF2. And uniformly coating the active agent on the surface of the part to be welded by using a clean brush. And (3) the thickness of the active agent coating layer is 0.5-1 mm, and welding is carried out after the coating layer is dried.
(4) And (3) placing the treated copper alloy plate under a K-TIG welding gun, wherein the K-TIG welding gun is vertical to the upper part of the joint, and the tip of a tungsten electrode of the welding gun is placed right above the butt joint position of the truncated edge and is 0.8-2 mm away from the active agent coating layer. The method realizes the combined welding of the copper alloy with the thickness of 15mm, and has the following welding process specifications: the voltage is 20V, the current is 800A, the speed is 220mm/min, the welding gas and the back protection gas are both high-purity argon, and the flow of the protection gas is 20-30L/min.
(5) And (4) cleaning the groove after welding the butt joint position of the truncated edges, and performing K-TIG narrow gap cladding. Selecting a welding process specification: voltage 15V, current 300A, deposition speed 300mm/min, welding wire number B30, welding wire diameter 3.0mm, and welding gas and back shielding gas are high-purity argon. The weld joint topography is shown in fig. 7.
Example 4
A novel combined large-penetration welding method for thick plate copper alloy comprises the following steps:
(1) a B10 copper alloy welding test plate is selected, and the size of the test plate is 150mm multiplied by 250mm multiplied by 18 mm. The joint adopts a combined groove of an I-shaped straight edge and a U-shaped groove, and the joint is polished, cleaned with acetone to remove oil stains and dried. The length of the truncated edge of the combined groove is 10mm, and the angle of the groove surface is 5-10 degrees. A schematic diagram of the combined groove of the I-shaped straight edge and the U-shaped groove is shown in FIG. 4.
(2) Aligning two prepared copper alloy welding test plates along the length direction of 250mm, and carrying out welding assembly to ensure that the assembly gap is less than or equal to 0.5mm and the misalignment is less than or equal to 0.2 mm; and spot welding is adopted for fixing.
(3) Mixing an active agent with absolute ethyl alcohol according to the mixing ratio: 20g of active agent per 100ml of absolute ethanol are added. The active agent comprises SiO as the main component2、CaF2、ZnF2. And uniformly coating the active agent on the surface of the part to be welded by using a clean brush. The thickness of the active agent coating layer is 1mm, and welding is carried out after the coating layer is dried.
(4) And (3) placing the treated copper alloy plate under a K-TIG welding gun, wherein the K-TIG welding gun is vertical to the upper part of the joint, and the tip of a tungsten electrode of the welding gun is placed right above the butt joint position of the truncated edge and is 0.8-2 mm away from the active agent coating layer. The copper alloy combination welding with the thickness of 18mm is realized, and the welding process is standard: the voltage is 20V, the current is 900A, the speed is 300mm/min, the welding gas and the back protection gas are both high-purity argon, and the flow of the protection gas is 20-30L/min.
(5) And (4) cleaning the groove after welding the butt joint position of the truncated edges, and performing K-TIG narrow gap cladding. Selecting a welding process specification: voltage 15V, current 400A, deposition speed 350mm/min, welding wire number B30, welding wire diameter 3.0mm, and welding gas and back shielding gas are high-purity argon.
In conclusion, the method for large-penetration combined welding of K-TIG and A-TIG can realize one-time penetration of the I-shaped butt joint (3-10 mm) without the groove. By designing a combined groove for a copper alloy thick plate larger than 10mm and adopting a welding mode combining one-time penetration and multi-layer and multi-channel deposition, the welding efficiency of the thick plate is improved, meanwhile, high-quality deep fusion welding of a welding seam is guaranteed, the probability of welding joint defects is reduced, the welding seam filling material is saved, and the weight and the welding deformation of a structural part are controlled. The welding method is an ideal choice for realizing high-quality and high-efficiency connection of the medium-thickness plate copper alloy in chemical engineering, aviation, ships, ocean engineering platforms and the like.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, improvement and the like made within the spirit of the present invention shall be included in the scope of the protection of the claims of the present invention.
Claims (8)
1. A novel combined large-penetration welding method for thick plate copper alloy is characterized by comprising the following steps:
s1, groove machining is carried out on the copper alloy plate to be welded: when the thickness of the plate is more than or equal to 3mm and less than 10mm, an I-shaped straight-edge groove is adopted; when the thickness of the plate is not less than 10mm and not more than 15mm, a Y-shaped combined groove is adopted, and the truncated edge is 8-10 mm; when the plate thickness is more than 15mm and less than or equal to 20mm, an I-shaped straight edge and U-shaped combined groove is adopted, and the truncated edge is 8-10 mm;
s2, cleaning the area to be welded, and assembling and fixing the assembly;
s3, uniformly mixing an active agent suitable for A-TIG welding with acetone or absolute ethyl alcohol, uniformly brushing the active agent on the to-be-welded area cleaned in the step S2 by using a brush, and drying a coating layer;
s4, placing the copper alloy plate processed in the step S3 under a K-TIG welding gun for welding: the butt joint position of the I-shaped straight-edge groove and the blunt edge of the combined groove adopts self-fluxing welding, the welding current is 500-900A, and the welding speed is 200-400 mm/min; and the narrow gap positions of the Y-shaped combined groove and the U-shaped groove are deposited by adopting K-TIG.
2. The method as claimed in claim 1, wherein the active agent comprises SiO2、CaF2And ZnF2。
3. The novel combined large penetration welding method for the thick plate copper alloy according to claim 2, wherein when an I-shaped straight groove is adopted, the technological parameters of K-TIG welding are as follows:
when the thickness of the plate is more than or equal to 3mm and less than 8mm, the welding current is 500-700A, and the welding speed is 300-400 mm/min;
when the thickness of the plate is more than or equal to 8mm and less than 10mm, the welding current is 600-900A, and the welding speed is 200-400 mm/min;
for the butt joint position of the truncated edge of the combined groove, the technological parameters of K-TIG welding are as follows:
the welding current is 700-900A, and the welding speed is 200-300 mm/min.
4. The novel joint large penetration welding method for thick plate copper alloy according to claim 3, wherein the group pairing gap in step S2 is less than 1.5mm, and the misalignment is less than 1 mm.
5. The novel combined large penetration welding method for the thick plate copper alloy according to claim 4, wherein the mixing ratio of the active agent to the acetone or the absolute ethyl alcohol in the step S3 is as follows: 10-20 g of active agent is added to each 100ml of acetone or absolute ethyl alcohol.
6. The novel combined large penetration welding method for thick plate copper alloy according to claim 5, wherein the thickness of the coating layer in step S3 is 0.5-1.2 mm.
7. The novel combined large penetration welding method for the thick plate copper alloy according to claim 1, wherein the process parameters of K-TIG cladding in the step S4 are as follows: the current is 300-400A, the deposition speed is 300-400 mm/min, and the diameter of the welding wire is 3.0 mm.
8. The novel combined large penetration welding method for the thick plate copper alloy according to claim 1, wherein a shielding gas is high-purity argon gas in a welding process, and the flow of the shielding gas is 20-30L/min.
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| CN115351391A (en) * | 2022-08-15 | 2022-11-18 | 金鲁鼎焊接(山东)有限公司 | Active argon arc automatic root welding method for stainless steel pipe butt joint |
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