CN113275712A - Sealing welding process for composite plate tube plate and titanium alloy heat exchange tube - Google Patents
Sealing welding process for composite plate tube plate and titanium alloy heat exchange tube Download PDFInfo
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- CN113275712A CN113275712A CN202110525306.9A CN202110525306A CN113275712A CN 113275712 A CN113275712 A CN 113275712A CN 202110525306 A CN202110525306 A CN 202110525306A CN 113275712 A CN113275712 A CN 113275712A
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- 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
- 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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- 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
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a sealing welding process of a composite plate tube plate and a titanium alloy heat exchange tube, which comprises the following steps: A) preparing: processing pipe holes and grooves on the pipe plate, wherein the grooves comprise V-shaped grooves and sunken steps positioned at the tops of the V-shaped grooves; cleaning; B) backing welding: assembling the titanium alloy heat exchange tube with the composite plate tube plate, keeping the welding gun close to the groove and the inter-channel temperature at 60-130 ℃, and performing first-layer backing welding and idle welding for one circle; C) welding the middle layer: keeping the temperature between the roads at 60-130 ℃ at intervals, moving a welding gun to perform wire filling and argon arc welding until the welding gun is welded to be level with the bottom surface of the step; D) cover surface welding: keeping the temperature between the channels at 60-130 ℃ at intervals, and performing wire filling and argon arc welding; the invention can prevent oxygen, nitrogen and hydrogen from entering the titanium alloy, improve the space of gas protection and welding gun rotation, ensure the welding tightness and the strength and fatigue resistance of the welding seam, and comprehensively improve the welding quality.
Description
Technical Field
The invention relates to a sealing welding process suitable for a composite plate tube plate and a titanium alloy heat exchange tube.
Background
The titanium alloy has excellent corrosion resistance, mechanical property and processing property, and is widely applied to various fields of national economy. Especially in chemical production, titanium alloy is used to replace stainless steel, nickel base alloy and other rare metals as corrosion resistant material, which is very important to increase yield, improve product quality, prolong service life of equipment, reduce consumption, reduce energy consumption, reduce cost, prevent pollution, improve labor condition and increase labor productivity. At present, in the process of welding a composite plate tube plate and a titanium alloy heat exchange tube seal, a joint form that a tube plate is provided with a groove and a heat exchange tube extends out of the surface of the tube plate or is flush with the surface of the tube plate is adopted; the traditional welding method is multilayer welding, because the interval time of each layer is too short, the titanium alloy is easy to exceed the temperature, the temperature is too high, oxygen, nitrogen and hydrogen in the air are easy to enter the titanium alloy, and gaps are easy to be dissolved in the titanium, so that the titanium lattice distortion, the deformation resistance and the strength and the hardness are increased, and the plasticity and the toughness are reduced, thereby seriously affecting the welding quality; and the common groove form is a V-shaped groove, the gas protection is carried out during welding, the rotating space of a welding gun is limited, the middle layer is difficult to cover, and the welding tightness, the strength of a welding seam and the fatigue resistance are affected.
Disclosure of Invention
The invention aims to provide a sealing welding process of a composite plate tube plate and a titanium alloy heat exchange tube, aiming at the defects in the prior art, which can prevent oxygen, nitrogen and hydrogen from entering the titanium alloy, improve the space of gas protection and welding gun rotation, ensure the welding tightness and the strength and fatigue resistance of a welding seam, and comprehensively improve the welding quality.
In order to achieve the purpose, the seal welding process of the composite plate tube plate and the titanium alloy heat exchange tube comprises the following steps of: A) preparing: processing pipe holes and grooves of the pipe plate, and cleaning the surfaces and the grooves of the pipe holes; the method is characterized in that: the groove comprises a V-shaped groove and a sunken step positioned at the top of the V shape; b) Backing welding: assembling the titanium alloy heat exchange tube with the composite plate tube plate, keeping the welding gun close to the groove and the inter-channel temperature at 60-130 ℃, and performing first-layer backing welding and idle welding for one circle; C) welding the middle layer: keeping the temperature between the roads at 60-130 ℃ at intervals, moving a welding gun to perform wire filling and argon arc welding until the welding gun is level to the bottom surface of the step; d) Cover surface welding: keeping the temperature between the tracks at 60-130 ℃ at intervals, moving a welding gun to perform wire filling and argon arc welding until the steps are fully filled and the fillet weld of the heat exchange tube is higher;
in the step B), the welding current is 100-200A, and the voltage is 10-20V; in the step C) and the step B), the welding current is 110-210A, the voltage is 12-22V, and the argon flow is 10-22L/min;
the invention adopts layered welding, the time difference between layers is kept, the temperature between channels is controlled at 60-130 ℃, oxygen, nitrogen and hydrogen can be prevented from entering the titanium alloy, the distortion and deformation resistance of titanium crystal lattice are prevented from increasing, and the plasticity and toughness of the welding area are ensured; the sunken steps are arranged at the top of the V-shaped groove, so that gas protection can be better performed, the area around the pipe hole is increased, a sufficient rotating space can be provided for a welding gun, the welding area is also increased, the welding seam is full, the strength of the welding seam is increased, the fatigue resistance of the welding seam is improved, the welding strength and tightness are ensured, and the middle layer can be better covered during cover surface welding, so that the protection effect is achieved, and the welding quality is comprehensively improved;
as a further improvement of the invention, in the step B), before welding, a titanium alloy welding activator is sprinkled in the groove; the titanium alloy welding activator not only obviously reduces air holes, but also exponentially increases the penetration;
as a further improvement of the invention, in the step B), a glass cover is added on the welding gun head; the protection effect of the argon can be improved;
as a further improvement of the invention, the welding gun adopts a lanthanum-tungsten electrode welding gun; the lanthanum tungsten electrode has the advantages of easier arc striking and stable electric arc;
in conclusion, the invention can prevent oxygen, nitrogen and hydrogen from entering the titanium alloy, improve the space of gas protection and welding gun rotation, ensure the welding tightness and the strength and the fatigue resistance of a welding seam, and comprehensively improve the welding quality.
Drawings
FIG. 1 is a front view of a bevel in an embodiment of the present invention.
Fig. 2 is a schematic view of a welding process according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The seal welding process of the composite plate tube plate and the titanium alloy heat exchange tube comprises the following steps: A) preparing: processing a pipe hole and a groove of a pipe plate, wherein the groove comprises a V-shaped groove 1 and a sunken step 2 positioned at the top of the V shape, the width of the step surface is 0.8-1mm, and cleaning agent is poured on clean cloth to clean the surface and the groove of the pipe hole; b) Backing welding: as shown in fig. 2, the titanium alloy heat exchange tube 3 is assembled with the composite plate tube plate 4, and a titanium alloy welding active agent, such as a titanium alloy a-TIG active agent, is uniformly scattered in the groove; a lanthanum-tungsten electrode welding gun 5 is close to the groove, a glass cover 6 is arranged on the gun head, the temperature between the channels is kept at 60-130 ℃, the first layer of backing welding is carried out, the welding current is 100-200A, the voltage is 10-20V, and a circle of welding is carried out in an empty welding mode for 7; C) welding the middle layer: keeping the temperature between the two paths at 60-130 ℃ at intervals, moving a lanthanum-tungsten electrode welding gun 5 to perform wire filling and argon arc welding, wherein the welding current is 110-210A, the voltage is 12-22V, and the argon flow is 10-22L/min until the welding is parallel to the bottom surface of the step, and obtaining an intermediate layer 8; d) Cover surface welding: keeping the temperature between the channels at 60-130 ℃ at intervals, moving a lanthanum tungsten electrode welding gun to perform wire filling and argon arc welding, wherein the welding current is 110-210A, the voltage is 12-22V, the argon flow is 10-22L/min until the steps are fully filled and the residual height of the fillet weld of the heat exchange tube is obtained, and obtaining a cover surface layer 9;
in each layer of welding, the welding current is determined according to the parameters of the heat exchange tube 3 and the composite plate tube plate 4 and is kept in a reasonable interval; when the welding current is too small, the arc striking is difficult, the electric arc is unstable, the defects of incomplete penetration, slag inclusion and the like can be caused, and molten drops of metal can be accumulated on the surface due to insufficient heat, so that the welding seam is not attractive in shape; the welding current is too large, so that the penetration is large, the defects of burning through, undercut and the like are easily generated, the alloy elements are too much burnt, the welding seam is overheated, the grains of a heat affected zone of the joint are large, the mechanical property of the welding seam is influenced, and pores are generated;
the invention adopts layered welding, the time difference between layers is kept, the inter-channel temperature is controlled at 60-130 ℃, oxygen, nitrogen and hydrogen can be prevented from entering titanium alloy and being dissolved in titanium, the distortion and deformation resistance of titanium crystal lattice can be prevented from increasing, and the plasticity and toughness of a welding area can be ensured; the sunken steps 2 are arranged at the top of the V-shaped groove 1, so that gas protection can be better performed, the area around the pipe hole is increased, a sufficient rotating space can be provided for a welding gun, the welding area is also increased, the welding seam is full, the strength of the welding seam is increased, the fatigue resistance of the welding seam is improved, the welding strength and tightness are ensured, and the middle layer can be better covered during cover surface welding, so that the protection effect is achieved, and the welding quality is comprehensively improved; the titanium alloy welding activator not only obviously reduces the air holes, but also exponentially increases the penetration, and the glass cover can improve the protection effect of argon gas, so that the lanthanum-tungsten electrode has the advantages of easier arc striking and stable electric arc, and further improves the quality of welding seams.
Claims (5)
1. A sealing welding process for a composite plate tube plate and a titanium alloy heat exchange tube comprises the following steps: A) preparing: processing pipe holes and grooves of the pipe plate, and cleaning the surfaces and the grooves of the pipe holes; the method is characterized in that: the groove comprises a V-shaped groove and a sunken step positioned at the top of the V shape; b) Backing welding: assembling the titanium alloy heat exchange tube with the composite plate tube plate, keeping the welding gun close to the groove and the inter-channel temperature at 60-130 ℃, and performing first-layer backing welding and idle welding for one circle; C) welding the middle layer: keeping the temperature between the roads at 60-130 ℃ at intervals, moving a welding gun to perform wire filling and argon arc welding until the welding gun is level to the bottom surface of the step; d) Cover surface welding: and (3) keeping the temperature between the tracks at 60-130 ℃ at intervals, moving a welding gun to perform wire filling and argon arc welding until the steps are fully filled and the fillet weld of the heat exchange tube is higher.
2. The seal welding process of the composite plate tube plate and the titanium alloy heat exchange tube according to claim 1, characterized in that: in the step B), the welding current is 100-200A, and the voltage is 10-20V; in the step C) and the step B), the welding current is 110-210A, the voltage is 12-22V, and the argon flow is 10-22L/min.
3. The seal welding process of the composite plate tube plate and the titanium alloy heat exchange tube according to claim 1 or 2, characterized in that: and in the step B), before welding, spraying a titanium alloy welding active agent in the groove.
4. The seal welding process of the composite plate tube plate and the titanium alloy heat exchange tube according to claim 3, characterized in that: in the step B), a glass cover is added on the welding gun head.
5. The seal welding process of the composite plate tube plate and the titanium alloy heat exchange tube according to claim 4, characterized in that: the welding gun adopts a lanthanum tungsten electrode welding gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110525306.9A CN113275712A (en) | 2021-05-14 | 2021-05-14 | Sealing welding process for composite plate tube plate and titanium alloy heat exchange tube |
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| CN202110525306.9A CN113275712A (en) | 2021-05-14 | 2021-05-14 | Sealing welding process for composite plate tube plate and titanium alloy heat exchange tube |
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| CN202110525306.9A Pending CN113275712A (en) | 2021-05-14 | 2021-05-14 | Sealing welding process for composite plate tube plate and titanium alloy heat exchange tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814529A (en) * | 2021-08-31 | 2021-12-21 | 东方电气集团东方锅炉股份有限公司 | Welding method for sealing welding between zirconium alloy pipes and plates |
| CN114054899A (en) * | 2021-11-09 | 2022-02-18 | 江苏双良锅炉有限公司 | Welding process of smoke tube and boiler shell of boiler shell boiler |
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Application publication date: 20210820 |