CN103464873A - 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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- CN103464873A CN103464873A CN2013104517722A CN201310451772A CN103464873A CN 103464873 A CN103464873 A CN 103464873A CN 2013104517722 A CN2013104517722 A CN 2013104517722A CN 201310451772 A CN201310451772 A CN 201310451772A CN 103464873 A CN103464873 A CN 103464873A
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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, relate in particular to the welding rod arc soldering method of a kind of titanium alloy and high temperature nickel alloy, belong to the material welding technology field.
Background technology
The specific strength of titanium or titanium alloy is very high, is the strong material of good heat, and the application in structural timber in recent years receives people's concern day by day.Nickel base superalloy has higher intensity and good non-oxidizability and resistance to corrosion 650～1000 ℃ of scopes, at industrial departments such as the energy, power, petrochemical industries, is used widely.Realize the reliable welding of titanium alloy and nickel base superalloy dissimilar metal, will promote the extensive use in fields such as aviation, the energy, power of titanium alloy and nickel-base alloy composite construction.
The welding technology difficulty that realizes titanium alloy and nickel base superalloy is very large.The linear expansion coefficient of titanium alloy and nickel base superalloy differs more than one times, and expanding with heat and contract with cold during melting welding makes joint produce very large welding stress; Titanium alloy, at a large amount of hydrogen of inhaling more than 400 ℃, can cause embrittlement, so titanium alloy and nickel-base alloy melting welding very easily cause weld cracking.At present be mainly to adopt vacuum diffusion welding, soldering and electric resistance welding to realize the welding of titanium alloy and nickel base superalloy.But titanium alloy and nickel-base alloy strength of joint that this several method obtains are lower, are difficult to meet the specification requirement of product, and application is subject to certain restrictions.Be connected with the reliable of nickel base superalloy if can obtain titanium alloy by easier welding method, have good application prospect.
Summary of the invention
The objective of the invention is the deficiency for existing titanium alloy and nickel base superalloy welding technology; as low as connector area embrittlement, tensile strength etc.; the welding rod arc soldering method of a kind of simple and easy to do titanium alloy and nickel base superalloy is proposed; it is that welding rod is as filling metal that this technology adopts alkaline low-hydrogen type Cr25-Ni13-Mo; by controlling with the postwelding temperature before strict weldering; and good inert gas shielding in whole welding process, realize titanium alloy is connected with the melting welding of nickel base superalloy.This welding procedure have simple, convenient flexibly, the characteristics such as cost is low.
The titanium alloy that the present invention proposes and the fusion welding method of nickel base superalloy dissimilar metal, by following technical step, realize:
(1) titanium alloy and nickel-base alloy removing surface; Remove greasy dirt and the oxide-film on titanium alloy, nickel-base alloy surface before weldering, make its surface bright and clean as far as possible and without any impurity, and clean drying.
(2) groove is processed; The sheet material Butt Joint square groove that thickness 5mm is following; Thickness 6mm opens 50 °～60 ° grooves of single face in above sheet material Butt Joint place, stays root face 2mm.
(3) weld preheating logical inert gas shielding; Before weldering, titanium alloy to be welded and nickel-base alloy are carried out to preheating, preheat temperature is 150 ℃～250 ℃; Titanium alloy after preheating and nickel base superalloy workpiece are placed in protective cover, drag logical inert gas Ar gas protection in cover; Environment temperature is more than 25 ℃.
(4) adopt the inversion direct current arc welder to be welded, welding condition is: DC reverse connection, welding current 60A～120A, weldingvoltage 24V～25V, sweating heat input 4kJ/cm～10kJ/cm.First titanium alloy and nickel-base alloy joint are carried out to tack welding before welding, tack welding parameter used is identical when formally welding.
(5) adopt alkaline low-hydrogen type Cr25-Ni13-Mo welding rod (welding rod model E309Mo-15), core diameter 2.5mm or 3.2mm; Before welding, through 350 ℃ * 2h, dry.
(6) Key Points of Welding Technology: welding arc deflection nickel alloy one side in welding process, reduce titanium alloy mother metal penetration ratio, reduce compound between the brittle metal in weld seam, improve the welding point cracking resistance; Whole welding process is carried out in cover is dragged in the Ar inert gas shielding, the applying argon gas protection simultaneously of the joint back side, and gas flow is 12L/min～20L/min.
(7) after having welded, immediately welded part is placed in the box baking oven that temperature remained on 300 ℃, closes the baking oven power supply, make welding work pieces with the oven temperature Slow cooling, to prevent weld crack.
(8), after welded part is cooled to room temperature, can from baking oven, take out workpiece.
In described step (1), the method for cleaning on titanium alloy and nickel-base alloy surface is: with sand paper, that titanium alloy and nickel-base alloy surface finish is clean, and make it expose metallic luster; Or workpiece to be welded is placed in to pickle soaks 15min～20min, then with clear water, will treat that surface of the work cleans; Described pickle refers to the dilute sulfuric acid (concentrated sulfuric acid of volume fraction 98% and water are diluted 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 are diluted with the ratio of 1:3), or the two mixed solution mixed mutually with the volume ratio ratio of 1: 2.
Thickness 6mm in described step (2) opens 50 °～60 ° grooves of single face in above sheet material Butt Joint place, refers to that titanium alloy sheet and nickel-base alloy plate connector open respectively 20 °～30 ° grooves of single face.
Preheating in described step (3) is to adopt box baking oven to carry out preheating to workpiece; Titanium alloy after preheating and nickel-base alloy workpiece are placed in special-purpose protective cover; logical inert gas Ar gas protection; be to be 12L/min～20L/min by flow pure Ar gas passes in protective cover, to prevent airborne oxygen, nitrogen etc., titanium alloy and Nickel-based Alloy Welding joint produced to the illeffects of embrittlement.
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 airborne oxygen, nitrogen, hydrogen, therefore must take in weld zone good safeguard measure, isolated to guarantee welding pool and temperature heat affected area and the air over 350 ℃; 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 will make temperature be protected fully in the welding region more than 350 ℃.Answer rounding off, reduce dead angle as far as possible for four jiaos of protective cover.
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 red copper backing plate of the joint back side with logical argon gas groove, and the protection back of weld is not subject to the infringement of air.
The titanium alloy that adopts the present invention to propose and the welding rod arc soldering method of nickel base superalloy dissimilar metal, can realize that titanium alloy is connected with the reliable of nickel base superalloy, obtains the welding point that there is no pore, defects i.e.cracks, and joint quality is stable.The titanium alloy that the present invention proposes and the welding method of nickel base superalloy have 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.
The specific embodiment
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.The 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, make head surface to be welded expose metallic luster.
(2) adopt the Cr25-Ni13-Mo welding rod (welding rod model E309Mo-15) that diameter is 2.5mm, the chemical composition of welding rod used is by percentage to the quality: C0.08%, and Cr24.5%, Ni13.5%, Mn1.4%, Si0.6%%, Mo2.2%, Cu0.45%, remaining is Fe; First welding rod being carried out to 350 ℃ * 2h of preheating before weldering dries.
(3) first welded titanium alloy and nickel alloy are carried out to preheating before the weldering, preheat temperature is about 150 ℃.
(4) the TC4 titanium alloy after preheating, GH3030 nickel alloy are placed in the protective cover of logical Ar gas, 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 the inversion direct current arc welder to be welded, welding condition is: DC reverse connection, and weldingvoltage is 24V, welding current is 65～75A, sweating heat input 4～6kJ/cm; In welding process, make welding arc deflection nickel alloy one side, joint both sides mother metal is heated evenly.
(6) after having welded, immediately welded part is placed in the box baking oven of 300 ℃, closes the baking oven power supply, make welding work pieces with the oven temperature Slow cooling, take out after baking oven is cooled to room temperature.
The TC4 titanium alloy and the GH3030 nickel alloy welding joint shaping that adopt said welding method to obtain are good.Do not find the microdefects such as crackle, pore through visual examination of weld and metallography microscope sem observation, meet the instructions for use of connected piece.
Embodiment 2:
The angle joint welding of TA15 titanium alloy and Inconel625 nickel-base alloy sheet material, the thickness of TA15 titanium alloy and Inconel625 nickel-base alloy is 6mm, size is respectively 160mm * 160mm.Employing adds pure Ar gas and drags the SMAW of cover protection to be welded.
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, make head surface to be welded expose metallic luster, grinder buffing 1mm chamfering for titanium alloy and nickel-based alloy pipe angle joint place.
(2) adopt the Cr25-Ni13-Mo welding rod (welding rod model E309Mo-15) that diameter is 3.2mm, the chemical composition of welding rod used is by percentage to the quality: C0.08%, and Cr25.0%, Ni13.6%, Mn1.4%, Si0.5%%, Mo2.45%, Cu0.35%, remaining is Fe; First welding rod being carried out to 350 ℃ * 2h of preheating before weldering dries.
(3) first welded TA15 titanium alloy and Inconel625 nickel-base alloy sheet material are carried out to preheating before the weldering, preheat temperature is about 180 ℃.
(4) the TA15 titanium alloy after preheating and Inconel625 nickel-base alloy are filled to angle joint at an angle of 90 by the ship shape set of locations, do not stay gap, workpiece is positioned 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 the inversion direct current arc welder to be welded, welding condition is: DC reverse connection, and weldingvoltage is 24V, welding current is 90～110A, sweating heat input 7～9kJ/cm; In welding process, make welding arc slightly be partial to nickel-base alloy one side, angle joint both sides mother metal is heated evenly.
(6) after having welded, immediately welded part is placed in the box baking oven of 300 ℃, closes the baking oven power supply, make the angle joint workpiece with the oven temperature Slow cooling, take out weldment after baking oven is cooled to room temperature.
The TA15 titanium alloy that adopts said welding method to be welded and Inconel625 nickel-base alloy angle joint are shaped good.Do not find the defects 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 be 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 modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (7)
1. the technology of arc welding of a titanium alloy and nickel base superalloy, is characterized in that, comprises the steps:
(1) cleaning titanium alloy and nickel-base alloy surface;
(2) groove is processed;
(3) weld preheating logical inert gas shielding;
(4) adopt the inversion direct current arc welder to be welded, welding condition is: DC reverse connection, welding current 60A～120A, weldingvoltage 24V～25V, sweating heat input 4kJ/cm～10kJ/cm; First titanium alloy and nickel-base alloy joint are carried out to tack welding before welding, tack welding parameter used is identical when formally welding;
Adopt alkaline low-hydrogen type Cr25-Ni13-Mo welding rod;
Welding arc deflection nickel alloy one side in welding process, reduce titanium alloy mother metal penetration ratio, reduces compound between the brittle metal in weld seam, improves the 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 in the box baking oven that temperature remains on 300 ℃ to 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, that titanium alloy and nickel-base alloy surface finish is clean, and make it expose metallic luster; Or workpiece to be welded is placed in to pickle soaks 15min～20min, then with clear water, will treat that surface of the work cleans; 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 volume ratio ratio of 1: 2; The concentrated sulfuric acid that the dilute sulfuric acid of described normal concentration is volume fraction 98% mixes with the 1:4 volume ratio with water, and the hydrochloric acid that the watery hydrochloric acid of described normal concentration is 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, thickness 6mm in described step (2) opens 50 °～60 ° grooves of single face in above sheet material Butt Joint place, refers to that titanium alloy sheet and nickel-base alloy plate connector open respectively 20 °～30 ° grooves of single face.
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) is to adopt box baking oven to carry out preheating to workpiece; Titanium alloy after preheating and nickel-base alloy workpiece are placed in protective cover, and logical inert gas Ar gas protection, be by flow, to be 12L/min～20L/min pure Ar gas passes in protective cover.
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 welding rod 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.
6. 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); Welding process is carried out in cover is dragged in the Ar inert gas shielding, and the length of protective cover is 300mm～500mm, width 200mm～300mm, four jiaos of rounding ofves 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 red copper backing plate of the joint back side with logical argon gas groove.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862147A (en) * | 2014-03-31 | 2014-06-18 | 山东大学 | Filler wire argon tungsten-arc welding process for molybdenum-copper alloy and nickel-base superalloy |
| CN103878470A (en) * | 2014-03-31 | 2014-06-25 | 山东大学 | Tungsten electrode argon arc welding process of dissimilar materials of titanium alloy and nickel alloy |
| CN104625345A (en) * | 2014-12-30 | 2015-05-20 | 上海锅炉厂有限公司 | C-HRA-3 high-temperature nickel-based alloy welding technology |
| 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 |
| CN107931840A (en) * | 2017-11-22 | 2018-04-20 | 宝鸡文理学院 | A kind of titanium nickel dissimilar welded joint induced with laser monotectic and uniform grain Reaction Welding method |
| CN114561529A (en) * | 2022-03-09 | 2022-05-31 | 西部金属材料股份有限公司 | Preparation method of Ti-Ni-Cr high-hardness titanium alloy plate |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862147A (en) * | 2014-03-31 | 2014-06-18 | 山东大学 | Filler wire argon tungsten-arc welding process for molybdenum-copper alloy and nickel-base superalloy |
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| CN107931840A (en) * | 2017-11-22 | 2018-04-20 | 宝鸡文理学院 | A kind of titanium nickel dissimilar welded joint induced with laser monotectic and uniform grain Reaction Welding method |
| 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 |
| CN114561529A (en) * | 2022-03-09 | 2022-05-31 | 西部金属材料股份有限公司 | Preparation method of Ti-Ni-Cr high-hardness titanium alloy plate |
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