CN103464873B - Electric-arc welding process for Ti alloy and nickel-base high-temperature alloy - Google Patents
Electric-arc welding process for Ti alloy and nickel-base high-temperature alloy Download PDFInfo
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- CN103464873B CN103464873B CN201310451772.2A CN201310451772A CN103464873B CN 103464873 B CN103464873 B CN 103464873B CN 201310451772 A CN201310451772 A CN 201310451772A CN 103464873 B CN103464873 B CN 103464873B
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Abstract
The invention discloses an electric-arc welding process for Ti alloy and nickel-base high-temperature alloy. The process comprises the steps of (1) cleaning faces of the Ti alloy and the nickel-base alloy; (2) grooving; (3) preheating before welding and introducing inert gas for protecting; (4) welding by adopting an inversion direct current electric-arc welding machine, and performing welding spot fixing on the Ti alloy and the nickel-base alloy before welding, wherein the welding electric arc in the welding process is deviated to one side of the nickel alloy, the fusing ratio of the Ti alloy base material is reduced, the brittle intermetallic compounds in welding seams are reduced, the anti-cracking performance of a welding joint is improved, the whole welding process is performed in the protection of inert gas and argon is introduced for protecting the back face of the joint. According to the electric-arc welding process for the Ti alloy and nickel-base high-temperature alloy, an alkaline low-hydrogen Cr25-Ni13-Mo system welding rod is adopted as a filling metal, and the fusing connecting between the Ti alloy and the nickel-base high-temperature alloy is realized by strict temperature control before and after the welding and the better inert gas protecting in the whole welding process. The welding process has the characteristics of simple operation, convenience, flexibility, low cost and the like.
Description
Technical field
The present invention relates to a kind of welding method of dissimilar metal, particularly relate to the welding rod arc soldering method of a kind of titanium alloy and high temperature nickel alloy, belong to material welding technology field.
Background technology
The specific strength of titanium or titanium alloy is very high, and be the strong material of good heat, the application in recent years in structural timber receives the concern of people day by day.Nickel base superalloy has higher intensity and good non-oxidizability and resistance to corrosion 650 ~ 1000 DEG C of scopes, is used widely at industrial departments such as the energy, power, petrochemical industries.Realize titanium alloy to weld with the reliable of nickel base superalloy dissimilar metal, by promotion titanium alloy and the extensive use of nickel-base alloy composite construction in fields such as aviation, the energy, power.
The welding technology difficulty realizing titanium alloy and nickel base superalloy is very large.Titanium alloy differs more than one times with the linear expansion coefficient of nickel base superalloy, and expanding with heat and contract with cold during melting welding makes joint produce very large welding stress; Titanium alloy inhales hydrogen in a large number more than 400 DEG C, can cause embrittlement, and therefore titanium alloy and nickel-base alloy melting welding very easily cause weld cracking.Vacuum diffusion welding, soldering and electric resistance welding is mainly adopted at present to realize welding of titanium alloy and nickel base superalloy.But titanium alloy and the nickel-base alloy strength of joint of this several method acquisition are lower, and be difficult to the technical requirement meeting product, application is subject to certain restrictions.If titanium alloy can be obtained by easier welding method be connected with the reliable of nickel base superalloy, have good application prospect.
Summary of the invention
The object of the invention is the deficiency for existing titanium alloy and nickel base superalloy welding technology; as connector area is brittle, tensile strength is low; the welding rod arc soldering method of a kind of simple and easy to do titanium alloy and nickel base superalloy is proposed; this technology adopts alkaline low-hydrogen type Cr25-Ni13-Mo system welding rod as filling metal; by controlling with postwelding temperature before strict weldering; and good inert gas shielding in whole welding process, realize being connected with the melting welding of nickel base superalloy titanium alloy.This welding procedure have simple, convenient flexibly, the feature such as cost is low.
The fusion welding method of the titanium alloy that the present invention proposes and nickel base superalloy dissimilar metal, is realized by following technical step:
(1) titanium alloy and nickel-base alloy removing surface; Remove titanium alloy, the greasy dirt on nickel-base alloy surface and oxide-film before weldering, make its surface bright and clean as far as possible and without any impurity, and clean dry.
(2) groove process; The sheet material Butt Joint square groove of below thickness 5mm; The sheet material Butt Joint place of more than thickness 6mm opens one side 50 ° ~ 60 ° grooves, stays root face 2mm.
(3) weld preheating also logical inert gas shielding; Carry out preheating to titanium alloy to be welded and nickel-base alloy before weldering, preheat temperature is 150 DEG C ~ 250 DEG C; Titanium alloy after preheating and nickel base superalloy workpiece are placed in protective cover, drag logical inert gas Ar gas shielded in cover; Environment temperature more than 25 DEG C.
(4) adopt inversion direct current arc welder to weld, welding condition is: DC reverse connection, welding current 60A ~ 120A, weldingvoltage 24V ~ 25V, thermal weld stress 4kJ/cm ~ 10kJ/cm.First carry out tack welding to titanium alloy and nickel-base alloy joint before welding, tack welding parameter used is identical with when formally welding.
(5) alkaline low-hydrogen type Cr25-Ni13-Mo welding rod (welding rod model E309Mo-15) is adopted, core diameter 2.5mm or 3.2mm; Dry through 350 DEG C × 2h before welding.
(6) Key Points of Welding Technology: the welding arc deflection nickel alloy side in welding process, reduces titanium alloy mother metal penetration ratio, reduces the brittle intermetallic thing in weld seam, improve welding point cracking resistance; Whole welding process is dragged in cover in Ar inert gas shielding and is carried out, and the applying argon gas protection simultaneously of the joint back side, gas flow is 12L/min ~ 20L/min.
(7) after having welded, immediately welded part is placed on temperature and has remained in the chamber oven of 300 DEG C, close baking oven power supply, make welding work pieces with oven temperature Slow cooling, to prevent weld crack.
(8) be cooled to after room temperature until welded part, workpiece can be taken out from baking oven.
In described step (1), the method for cleaning on titanium alloy and nickel-base alloy surface is: with sand paper, titanium alloy and nickel-base alloy surface finish is clean, makes it expose metallic luster; Or workpiece to be welded is placed in pickle soaks 15min ~ 20min, then will treat that surface of the work is cleaned with clear water; Described pickle refers to the dilute sulfuric acid (concentrated sulfuric acid of volume fraction 98% and water dilute with the ratio of 1:4) of normal concentration, or the watery hydrochloric acid of normal concentration (hydrochloric acid of volume fraction 36% and water dilute with the ratio of 1:3), or the two mixed solution mixed mutually with the ratio of volume ratio 1: 2.
The sheet material Butt Joint place of more than the thickness 6mm in described step (2) opens one side 50 ° ~ 60 ° grooves, refers to that titanium alloy sheet and nickel-base alloy plate connector open one side 20 ° ~ 30 ° grooves respectively.
Preheating in described step (3) adopts chamber oven to carry out preheating to workpiece; Titanium alloy after preheating and nickel-base alloy workpiece are placed in special protective cover; logical inert gas Ar gas shielded; be be that the pure Ar gas of 12L/min ~ 20L/min passes in protective cover by flow, to prevent the oxygen in air, nitrogen etc., brittle illeffects produced to titanium alloy and Nickel-based Alloy Welding joint.
The deposited metals chemical composition of the alkaline low-hydrogen type welding rod in described step (5) is: C0.08% ~ 0.14%, Cr22% ~ 25%, Ni12% ~ 14%, Mn0.5% ~ 2.5%, Si0.5% ~ 0.8%, Mo2.0% ~ 3.0%, Cu0.35% ~ 0.65%, remaining is Fe, by percentage to the quality.
In described step (6) Key Points of Welding Technology, the argon shield of weld zone is absolutely necessary.Because titanium alloy has very strong affinity to the oxygen in air, nitrogen, hydrogen, therefore must take good safeguard measure in weld zone, to guarantee heat affected area more than 350 DEG C of welding pool and temperature and air exclusion; The length of protective cover is 300mm ~ 500mm, width 200mm ~ 300mm, and concrete size can be determined according to weldment shape, thickness of slab etc., but the welding region that temperature will be made to be in more than 350 DEG C is protected fully.Rounding off is answered in the corner of protective cover, reduces dead angle as far as possible.
In described step (6) Key Points of Welding Technology, also will there be argon shield at titanium alloy and the nickel-base alloy joint back side, and butt plates welding adopts the joint back side with the red copper backing plate of logical argon gas groove, and protection back of weld is not by the infringement of air.
The titanium alloy adopting the present invention to propose and the welding rod arc soldering method of nickel base superalloy dissimilar metal, can realize titanium alloy and be connected with the reliable of nickel base superalloy, obtain the welding point not having the defect such as pore, crackle, joint quality is stablized.The welding method of the titanium alloy that the present invention proposes and nickel base superalloy has the advantages such as technique is simple, cost is low, easy to utilize, can meet the requirement of titanium alloy and nickel base superalloy dissimilar metal structure Welded Joints quality.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
The SMAW of TC4 titanium alloy (Ti-6Al-4V alloy) sheet material and GH3030 nickel base superalloy.TC4 titanium alloy sheet is of a size of 200mm × 120mm, and thickness is 4mm; GH3030 nickel alloy test plate (panel) is of a size of 200mm × 120mm, and thickness is 4mm, two plate butt welding.
The processing step of concrete titanium alloy and nickel alloy sheet material SMAW is as follows:
(1) by TC4 titanium alloy and the place's sand papering of GH3030 nickel alloy banjo fixing butt jointing, head surface to be welded is made to expose metallic luster.
(2) employing diameter is the Cr25-Ni13-Mo welding rod (welding rod model E309Mo-15) of 2.5mm, and the chemical composition of welding rod used is by percentage to the quality: C0.08%, Cr24.5%, Ni13.5%, Mn1.4%, Si0.6%%, Mo2.2%, Cu0.45%, and remaining is Fe; First carry out preheating 350 DEG C × 2h to welding rod before weldering to dry.
(3) first carry out preheating to welded titanium alloy and nickel alloy before weldering, preheat temperature is about 150 DEG C.
(4) be placed in the protective cover of logical Ar gas by the TC4 titanium alloy after preheating, GH3030 nickel alloy, the joint back side adopts the red copper backing plate applying argon gas protection simultaneously with vent cap, and gas flow is 15L/min; Tack welding.
(5) adopt inversion direct current arc welder to weld, welding condition is: DC reverse connection, and weldingvoltage is 24V, and welding current is 65 ~ 75A, thermal weld stress 4 ~ 6kJ/cm; In welding process, make welding arc be partial to nickel alloy side, joint both sides mother metal is heated evenly.
(6) after having welded, immediately welded part is placed in the chamber oven of 300 DEG C, closes baking oven power supply, make welding work pieces with oven temperature Slow cooling, be cooled to after room temperature until baking oven and take out.
TC4 titanium alloy and the GH3030 nickel alloy welding joint shaping of the acquisition of employing said welding method are good.Do not find the microdefect such as crackle, pore through visual examination of weld and metallography microscope sem observation, meet the instructions for use of connected piece.
Embodiment 2:
TA15 titanium alloy welds with the angle joint of Inconel625 nickel-base alloy sheet material, and the thickness of TA15 titanium alloy and Inconel625 nickel-base alloy is 6mm, and size is respectively 160mm × 160mm.Adopt and add the SMAW that pure Ar gas drags cover to protect and weld.
The processing step of TA15 titanium alloy and Inconel625 nickel base alloy covered electrode arc welding is as follows:
(1) to TA15 titanium alloy and the place's sand papering of Inconel625 nickel-base alloy angle joint, head surface to be welded is made to expose metallic luster, titanium alloy and nickel-based alloy pipe angle joint place grinder buffing 1mm chamfering.
(2) employing diameter is the Cr25-Ni13-Mo welding rod (welding rod model E309Mo-15) of 3.2mm, and the chemical composition of welding rod used is by percentage to the quality: C0.08%, Cr25.0%, Ni13.6%, Mn1.4%, Si0.5%%, Mo2.45%, Cu0.35%, and remaining is Fe; First carry out preheating 350 DEG C × 2h to welding rod before weldering to dry.
(3) first carry out preheating to welded TA15 titanium alloy and Inconel625 nickel-base alloy sheet material before weldering, preheat temperature is about 180 DEG C.
(4) the TA15 titanium alloy after preheating and Inconel625 nickel-base alloy are filled angle joint at an angle of 90 by ship shape set of locations, do not stay gap, be positioned over by workpiece in the protective cover of logical Ar gas, the applying argon gas protection simultaneously of angle joint front and back, gas flow is 20L/min; Tack welding.
(5) adopt inversion direct current arc welder to weld, welding condition is: DC reverse connection, and weldingvoltage is 24V, and welding current is 90 ~ 110A, thermal weld stress 7 ~ 9kJ/cm; In welding process, make welding arc slightly be partial to nickel-base alloy side, angle joint both sides mother metal is heated evenly.
(6) after having welded, immediately welded part is placed in the chamber oven of 300 DEG C, closes baking oven power supply, make angle joint workpiece with oven temperature Slow cooling, be cooled to after room temperature until baking oven and take out weldment.
The TA15 titanium alloy adopting said welding method to be welded and Inconel625 nickel-base alloy angle joint are shaped well.Do not find the defect such as crackle, pore through visual examination of weld and metallography microscope sem observation, meet the instructions for use of connected piece.
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (7)
1. a technology of arc welding for titanium alloy and nickel base superalloy, is characterized in that, comprises the steps:
(1) titanium alloy and nickel-base alloy surface is cleared up;
(2) groove process, the sheet material Butt Joint place of more than thickness 6mm opens one side 50 ° ~ 60 ° grooves;
(3) weld preheating also logical inert gas shielding;
(4) adopt inversion direct current arc welder to weld, welding condition is: DC reverse connection, welding current 60A ~ 120A, weldingvoltage 24V ~ 25V, thermal weld stress 4kJ/cm ~ 10kJ/cm; First carry out tack welding to titanium alloy and nickel-base alloy joint before welding, tack welding parameter used is identical with when formally welding;
Adopt alkaline low-hydrogen type Cr25-Ni13-Mo welding rod;
Welding arc deflection nickel alloy side in welding process, reduces titanium alloy mother metal penetration ratio, reduces the brittle intermetallic thing in weld seam, improve welding point cracking resistance; Whole welding process is carried out in inert gas shielding, the applying argon gas protection simultaneously of the joint back side;
(5), after having welded, welded part is placed on temperature and remains in the chamber oven of 300 DEG C, Slow cooling.
2. the technology of arc welding of titanium alloy as claimed in claim 1 and nickel base superalloy, it is characterized in that, in described step (1), the method for cleaning on titanium alloy and nickel-base alloy surface is: with sand paper, titanium alloy and nickel-base alloy surface finish is clean, makes it expose metallic luster; Or workpiece to be welded is placed in pickle soaks 15min ~ 20min, then will treat that surface of the work is cleaned with clear water; Described pickle refers to the dilute sulfuric acid of normal concentration, or the watery hydrochloric acid of normal concentration, or the two mixed solution mixed mutually with the ratio of volume ratio 1: 2; The dilute sulfuric acid of described normal concentration is that the concentrated sulfuric acid of volume fraction 98% mixes with 1:4 volume ratio with water, and the watery hydrochloric acid of described normal concentration is that the hydrochloric acid of volume fraction 36% mixes with the volume ratio of 1:3 with water.
3. the technology of arc welding of titanium alloy as claimed in claim 1 and nickel base superalloy, it is characterized in that, the sheet material Butt Joint place of more than the thickness 6mm in described step (2) opens one side 50 ° ~ 60 ° grooves, refers to that titanium alloy sheet and nickel-base alloy plate connector open one side 20 ° ~ 30 ° grooves respectively.
4. the technology of arc welding of titanium alloy as claimed in claim 1 and nickel base superalloy, is characterized in that, the preheating in described step (3) adopts chamber oven to carry out preheating to workpiece; Being placed in protective cover by the titanium alloy after preheating and nickel-base alloy workpiece, logical inert gas Ar gas shielded, is be that the pure Ar gas of 12L/min ~ 20L/min passes in protective cover by flow.
5. the technology of arc welding of titanium alloy as claimed in claim 1 and nickel base superalloy, it is characterized in that, in described step (4), the deposited metals chemical composition of described alkaline low-hydrogen type Cr25-Ni13-Mo welding rod is: C0.08% ~ 0.14%, Cr 22% ~ 25%, Ni 12% ~ 14%, Mn 0.5% ~ 2.5%, Si 0.5% ~ 0.8%, Mo 2.0% ~ 3.0%, Cu 0.35% ~ 0.65%, remaining is Fe, by percentage to the quality.
6. the technology of arc welding of titanium alloy as claimed in claim 1 and nickel base superalloy; it is characterized in that; in described step (4); welding process is dragged in cover in Ar inert gas shielding and is carried out; the length of protective cover is 300mm ~ 500mm; width 200mm ~ 300mm, the corner rounding off of protective cover.
7. the technology of arc welding of titanium alloy as claimed in claim 1 and nickel base superalloy, is characterized in that, in described step (4), adopts the joint back side with the red copper backing plate of logical argon gas groove.
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| CN201310451772.2A CN103464873B (en) | 2013-09-27 | 2013-09-27 | Electric-arc welding process for Ti alloy and nickel-base high-temperature alloy |
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| CN201310451772.2A CN103464873B (en) | 2013-09-27 | 2013-09-27 | Electric-arc welding process for Ti alloy and nickel-base high-temperature alloy |
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| CN103464873B true CN103464873B (en) | 2015-06-17 |
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Families Citing this family (7)
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| CN103878470B (en) * | 2014-03-31 | 2016-08-17 | 山东大学 | A kind of titanium alloy and the argon tungsten arc process of nickel alloy foreign material |
| CN103862147B (en) * | 2014-03-31 | 2015-12-09 | 山东大学 | The silk filling pulsed tungsten argon arc weld(ing) technique of molybdenum-copper and nickel base superalloy |
| CN104625345B (en) * | 2014-12-30 | 2016-11-30 | 上海锅炉厂有限公司 | C-HRA-3 high-temperature nickel-base alloy welding procedure |
| CN107699832A (en) * | 2017-10-17 | 2018-02-16 | 宝鸡市铭坤有色金属有限公司 | A kind of preparation method of titanium alloy plate |
| CN107931840B (en) * | 2017-11-22 | 2020-04-28 | 宝鸡文理学院 | Laser-induced monotectic and homogeneous reaction welding method for titanium-nickel heterojunction |
| CN114561529B (en) * | 2022-03-09 | 2023-06-30 | 西部金属材料股份有限公司 | Preparation method of Ti-Ni-Cr high-hardness titanium alloy plate |
| CN115922141A (en) * | 2022-12-05 | 2023-04-07 | 北京工业大学 | Metal-cored welding wire for GH3030 high-temperature alloy with high cracking resistance |
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| GB2228217B (en) * | 1989-02-07 | 1993-01-27 | Mtu Muenchen Gmbh | A method for connecting turbine wheel discs |
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| JP2006187786A (en) * | 2005-01-06 | 2006-07-20 | Hitachi Cable Ltd | Method for connecting titanium thin sheet and connected member connected by using the same |
| CN102728937A (en) * | 2012-07-06 | 2012-10-17 | 山东大学 | Dissimilar metal welding method of titanium alloy and austenitic stainless steel |
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- 2013-09-27 CN CN201310451772.2A patent/CN103464873B/en not_active Expired - Fee Related
Patent Citations (5)
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|---|---|---|---|---|
| GB2228217B (en) * | 1989-02-07 | 1993-01-27 | Mtu Muenchen Gmbh | A method for connecting turbine wheel discs |
| CN1346725A (en) * | 2001-10-08 | 2002-05-01 | 北京航空航天大学 | Superplastic diffusion process for joining different alloys and its application |
| JP2006187786A (en) * | 2005-01-06 | 2006-07-20 | Hitachi Cable Ltd | Method for connecting titanium thin sheet and connected member connected by using the same |
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| CN102744502A (en) * | 2012-07-11 | 2012-10-24 | 山东大学 | Wire filling tungsten electrode argon-arc welding process for TA15 titanium alloy and austenitic stainless steel |
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