CN110405375A - The method of double transition zone REPAIR WELDING residual crackles - Google Patents
The method of double transition zone REPAIR WELDING residual crackles Download PDFInfo
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- CN110405375A CN110405375A CN201910721746.4A CN201910721746A CN110405375A CN 110405375 A CN110405375 A CN 110405375A CN 201910721746 A CN201910721746 A CN 201910721746A CN 110405375 A CN110405375 A CN 110405375A
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- transition zone
- welding
- crackle
- residual
- crackles
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Classifications
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
Abstract
The invention discloses a kind of methods of double transition zone REPAIR WELDING residual crackles, it is related to the crackle Welding Repair Technology field of steel systeming equipment part generation, the crackle that the technical issues of solution is to provide the generation of a kind of pair of steel systeming equipment part can not remove the method that clean weld seam carries out REPAIR WELDING.The technical solution adopted by the present invention is that: the method for double transition zone REPAIR WELDING residual crackles, comprising the following steps: S1 removes weld groove face and two sides；S2 keeps the temperature high nickel electrode (nickel mass fraction >=90%) with austenitic electrode spare；S3 preheats groove and two sides；S4 selects high nickel electrode having cracks to weld nickelic transition zone, the reselection intensity austenitic electrode higher than nickelic transition zone and base material reinforcement of weld layer on nickelic transition zone；S5 postheating is simultaneously kept the temperature；After S6 weld seam is cooled to room temperature, the fusion of polishing welding seams and base material.The present invention, which is suitable for the crackle that all steel systeming equipment parts generate, can not remove clean weld seam progress REPAIR WELDING.
Description
Technical field
The present invention relates to the crackle Welding Repair Technology fields that steel systeming equipment part generates, and specifically a kind of pair of crackle can not be clear
The method for carrying out REPAIR WELDING except clean weld seam.
Background technique
The material of 1250 tons of brick machine bodies is 35 cast steels, and since long-term excess load dynamic load uses, hydraulic cylinder side is generated
The fatigue crack of 320mm long, cannot be used continuously, and must repair to crackle.It is lacked with carbon arc air gouging and electric angle grinder cleaning
There are also crack defect presence when sunken depth to the depths 120mm, due to cannot closely continue very much to remove crack defect apart from hydraulic cylinder.Such as
Fruit crackle, which does not clean up, just carries out normal welding to weld seam, has remaining crack defect in weld seam, if equipment operation makes
With, it, may be less than a few houres or several days under the action of load, remaining crackle will extend up to fracture, cause equipment scrapping
With biggish economic loss.Currently, taking the tow sides in cracks in the case where such as meeting and can not removing crack defect more
Install backboard additional, and drilling is riveted or worn the mode of bolt fastening to solve.Since the brick machine body cracks back side is hydraulic
Cylinder, and front surface has irregular radian, cannot take the method for installing backboard additional, thus can only by new welding manner come into
Row crack forming mechanism.
In welding procedure, has the method for double transition zone welding, this method is welded primarily directed to different metal materials
When, prevent in weld seam generate metal between frangible compounds and crackle.
" TA1/X80 the composite plate bis- transition zone melting welding banjo fixing butt jointing tissues of TiNi/NiCrMo and performance " (Wu Wei just etc.,
" investigation of materials journal " the 5th phase of volume 30 in 2016) text is related to double transition zones welding researchs, the mistake in TiA1/X80 composite plate
When crossing layer welding, the thermophysical property of Ti and Fe differ greatly, and a large amount of hard crisp intermetallic compounds, low are easily formed in weld seam
Melting eutectic and carbide, this makes its weld seam that embrittlement easily occur.From fusion welding non-uniform temperature field, dissect
The problems such as titanium-steel metallurgical bonding is difficult, compound board interface adaptation and bad Organization Matching, uses TiNi and NiCrMo for transition zone
Welding material carries out titanium-steel composite board melting welding docking experiment, and each layer seam organization of analysis welding point develops, composition transfer is special
Point has dissected the object phase of transition zone weld seam, has obtained the composite plate welding point with preferable mechanical property.The paper studies table
Bright: main problem when welding to titanium with steel is analyzed, and is taken TiNi and NiCrMo respectively as double transition zones are welded and is welded
Material so that transition zone weld seam mutually fuses well, and is not likely to produce frangible compounds etc. between metal, it is ensured that titanium-steel is compound
The weldquality of plate and the mechanical property of welding point.
" high manganese steel frog and rail double layered transition flash butt weld(ing) " (fourth big etc., " welding journal " in December, 1999) is another
When outer one paper about the welding of double transition zones, Article analysis potassium steel and rail use electric arc welding, Yi Gao Meng
Steel heat affected area generates the defects of liquation crack, Carbide Precipitation and rail heat affected area generate martensite.If first in height
Manganese steel rail side forced shaping arc welding, using two kinds of welding material welding transition layers: being welded with high manganese welding electrode the bottom of rail
It connects, after double transition zones of the web of the rail and rail head welded by self-shielded flux cord wire, then carries out potassium steel rail and rail progress butt welding,
The quiet curved test value of connector increases.And it uses the transition zone welding material developed to combine and forming technology of arc welding is forced first to exist
High manganese steel frog side built-up welding transition zone, then weld and test with track bond, the quiet curved test value of connector also increases, comprehensive
It can increase.So taking first when high manganese steel frog and rail welding in two kinds of transition zone welding materials of side built-up welding
Method can prevent welding point from generating liquation crack, Carbide Precipitation and the defects of martensitic structure, can make the quiet curved examination of connector
Value etc. is tested to increase.
" research of ferrosteel roll Bead weld repair " (Wu Yangao, University Of Tianjin's master thesis, in December, 2002) document point
Having analysed ferrosteel roll is a kind of material between steel and iron, and phosphorus content is high, therefore the maximum technical problem of Bead weld repair is just
It is crack problem.The excellent toughness of research and utilization stainless steel designs stainless flux-cored wire 02# built-up welding First Transition layer, then benefit
With low-carbon and with YD404L-4 flux-cored wire the second transition zone of built-up welding with the consistent alloy system of working lining welding wire, thoroughly have
The crack problem of the solution welding high-carbon half steel of effect.The research is using the preferable stainless flux-cored wire of plasticity on ferrosteel roll
Built-up welding First Transition layer makes the first built-up welding transition zone have good toughness；Then again on the basis of First Transition layer built-up welding with
The identical second transition zone flux-cored wire of working lining alloy system, avoidable built-up welding is consistent with working lining directly on ferrosteel roll
Alloy welding wire and the problem of crack.
According to above-mentioned analysis it is found that existing double transition zone weldings including above-mentioned document are in the selection of welding material,
And the double transition zones of built-up welding effect and purpose be unsuitable for carrying out the defect that can not neatly remove crackle welding repairing
It is multiple.
Summary of the invention
The crackle generated technical problem to be solved by the invention is to provide a kind of pair of steel systeming equipment part can not be removed completely
Weld seam carry out REPAIR WELDING double transition zone welding repair methods.
The technical solution adopted by the present invention to solve the technical problems is: the side of double transition zone REPAIR WELDING residual crackles
Method cracks steel equipment parts, can not remove clean weld seam progress REPAIR WELDING again, comprising the following steps:
S1, weld groove face and two sides are removed；It is specific: in step S1, to remove weld groove face and 10~15mm of two sides
Interior water, rust, oily impurity.
It is S2, the heat preservation of the high nickel electrode and austenitic electrode of nickel mass fraction >=90% is spare；It is specific: step S2
In, the holding temperature of high nickel electrode is 100~150 DEG C.
S3, groove and two sides are preheated；It is specific:, will be within the scope of 200~300mm of groove and two sides in step S3
Uniformly 200~250 DEG C of preheating.
S4, the high nickel electrode of selection are having cracks to weld nickelic transition zone, and reselection intensity is than nickelic transition zone and base material
High austenitic electrode reinforcement of weld layer on nickelic transition zone；
Specific: in step S4, nickelic transition zone and reinforcing layer are all made of the welding sequence welding of backstep sequence, and every section
Length is controlled in 60~100mm, and joint should be staggered at least 20mm；
Further, in nickelic transition zone and reinforcing layer welding process, being often soldered an electrode, immediately in step S4
Welding bead hammering is carried out with the hammer with round end, first hammers among welding bead, then hammer the fusion of welding bead and base material, makes welding bead surface
It is covered with point.
Moreover: in step S4, filling and the welding of capping layer should control interlayer temperature not less than preheating temperature.
It is specific: in step S4, nickelic transition zone with a thickness of 4~6mm, reinforcing layer is with a thickness of 5~7mm.
S5, postheating are simultaneously kept the temperature；Specific: in step S5, postwelding is immediately heated to 300~350 DEG C, keeps the temperature 1~2h.
After S6, weld seam are cooled to room temperature, the fusion of polishing welding seams and base material.It is specific: in step S6, to use angular grinding wheel
The fusion of weld seam and base material is ground in machine maintenance, makes fusion rounding off；Or welding seam grinding is flushed at base material.
The method of double transition zone REPAIR WELDING residual crackles is not removing the clean nickelic transition zone of cracks built-up welding respectively
And reinforcing layer, double transition zones are formed, nickelic transition zone is conducive to improve the plasticity and toughness for having residual cracks weld seam, reduces steel
To the sensibility of notch, the solubility of hydrogen in deposited metal is improved, the also absorbable more stress for there are cracks reduces stress collection
In.Reinforcing layer plays the role of reinforcing to nickelic transition zone, and nickelic transition zone can be prevented because by larger external force or action of pulling stress
And by drawing crack.The extension for controlling crackle of reinforcing layer simultaneously prevents new crackle.
The beneficial effect of the method for transition zone REPAIR WELDINGs residual crackles of the invention double is: device therefor of the present invention, equipment
Simply, convenient for study, it is easy to grasp, the stress and stress that can efficiently reduce residual cracks are concentrated, and prevent from being answered by drawing
Power and the extension for remaining crackle occur.The present invention, which can be ensured, to be born load there are also the weld seam of remaining crackle in the root of weld and resists tired
The ability of labor prevents residual crack growth and generates new crackle again, so that it is guaranteed that the performance and requirement of commissure, are filled up
The country is not in the case where crackle cleans up, the direct technical problem of progress REPAIR WELDING.The present invention is suitable for all
The crackle that steel systeming equipment part generates can not remove clean weld seam and carry out REPAIR WELDING, and application prospect is extensive.
Detailed description of the invention
Fig. 1 is the positional diagram of crackle in the present invention, transition zone and reinforcing layer.
Appended drawing reference: crackle 1, nickelic transition zone 2, reinforcing layer 3.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
With reference to Fig. 1, the method for double transition zone REPAIR WELDING residual crackles cracks 1 to steel equipment parts, can not remove again
Clean weld seam carries out REPAIR WELDING, comprising the following steps:
The impurity such as weld groove face and water, rust, oil in 10~15mm of two sides are removed before S1, weldering.
S2, drying is carried out in accordance with regulations in high nickel electrode and austenitic electrode, and be placed in 100~150 DEG C of insulation barrel
It is spare.Wherein high nickel electrode refers to the welding rod of nickel mass fraction >=90%.
S3, groove and two sides are preheated.Such as 200 will will be uniformly preheated within the scope of 200~300mm of groove and two sides
~250 DEG C, the purpose of preheating is to reduce welding point cooling velocity, prevents solidification cracking or hardened structure.
S4, the high nickel electrode of selection are having the nickelic transition zone 2 of welding at crackle 1, obtain First Transition layer；Reselection intensity ratio
Nickelic transition zone 2 and the high austenitic electrode of base material the reinforcement of weld layer 3 on nickelic transition zone 2, obtain the second transition zone, such as scheme
Shown in 1.Nickelic transition zone 2 can absorb the more stress at crackle 1, reduces steel to the sensibility of notch, deposition gold also can be improved
The solubility of hydrogen in category.Specifically, transition region thickness control is in 4~6mm, for example, 5mm.Reinforcing layer 3 is to upper one layer, i.e., to height
Nickel transition zone 2 plays the role of reinforcing, prevents nickelic 2 because of metal of transition zone by larger external force or tensile stress and by drawing crack.Specifically
, 3 thickness control of reinforcing layer is in 5~7mm, for example, 6mm.
The welding process of nickelic transition zone 2 and reinforcing layer 3 should take the welding sequence of backstep sequence, every segment length control
Within the scope of 60~100mm, stress and keep stress distribution more uniform to reduce, midway joint should be staggered at least 20mm.It is nickelic
In 3 welding process of transition zone 2 and reinforcing layer, it is often soldered an electrode, carries out welding bead hammering with the hammer with round end immediately, such as
Hammer weight 0.5kg, round end diameter R=5mm, first hammer among welding bead, then hammer the fusion of welding bead and base material, make welding bead surface
Until being covered with point, keep welding bead surface microstructure broken, to eliminate part stress and change tensile stress as compression.Filling and capping layer
Welding should control interlayer temperature and be equal to or slightly higher than preheating temperature, reduce weld seam to prevent the coarse tissue of the excessively high generation of temperature
Plasticity and toughness.
The present invention is different from general double transition zone welding, below from the selection of welding material and the work of double transition zones
It is illustrated in terms of with purpose two.On the one hand, in the selection of welding material, existing double transition zone weldering selection welding materials
Principle is: can fuse together well with the metal of two kinds of different performances, transition interlayer also answers good fusion, and energy
Guarantee the performance requirement of junction weld seam.Welding to two different each metalloid materials, selected double buffer layer materials are equal
It is different.The welding material that the present invention selects is high nickel electrode and austenitic electrode, is split for what is generated for steel equipment parts
Line carries out REPAIR WELDING, and the welding material of selection is fixed.On the other hand, existing in the effect and purpose of the double transition zones of built-up welding
The weldering of double transition zones is using the effect of double transition zones: avoid two kinds of biggish metal alloyings of performance difference together when the gold that generates
Between category compound make the plasticity of weld metal, toughness degradation and become fragile, or crack surfacing layer metal.Xenogenesis gold
The purpose for belonging to transition is to fuse welding material and base material good to allow the metal material on both sides closer to base material, allows deposition
Intermetallic compound is not generated between metal；Namely by double transition zones between weld seam, make two kinds of biggish gold of performance difference
Belong to and being combined together by centre connection transition layer method, meet the mechanical property requirements of weld seam, prevents weld seam or overlay cladding from producing
Raw crackle.The present invention is using the effect of double transition zones: selecting nickelic welding rod welding first layer (nickelic transition zone 2), is conducive to
The plasticity and toughness for having residual cracks weld seam are improved, reduces steel to the sensibility of notch, improves the dissolution of hydrogen in deposited metal
Degree, the also absorbable more stress for having cracks, increases the plasticity of overlay cladding, reduces stress and concentrates；But nickelic transition zone 2
Intensity it is lower.The second layer (reinforcing layer 3) is welded than base material and in the high austenitic electrode of nickelic transition zone 2 using intensity, it is right
First layer (nickelic transition zone 2) plays the role of reinforcing, can prevent due to by larger external force or action of pulling stress by drawing crack.Its mesh
Be control crackle extension and prevent new crackle.
S5, postheating are simultaneously kept the temperature.Especially to the steel equipment parts for having tendency of hardenability, it should be noted that at the rear heat of postwelding
Reason keeps the temperature the rear heat treatment of 1~2h for example, being immediately heated the steel equipment parts postwelding for having tendency of hardenability to 300~350 DEG C.Afterwards
Heat treatment can reduce portion of residual stress and eliminate the hydrogen content in welding point, prevent cold crack.
After S6, weld seam are cooled to room temperature, the fusion of polishing welding seams and base material.After weld seam is cooled to room temperature, with angular sand
The fusion of turbine reconditioning weld seam and base material makes fusion rounding off；If bear dynamic loading, should by welding seam grinding at mother
Material flushes, and prevents stress and concentrates and generate fatigue crack.
By carrying out REPAIR WELDING practice in 1250 tons of brick machine bodies (35 cast steel of material) cracks, the weldering of weld seam is demonstrated
It connects quality and service performance meets the requirements, and the equipment that the method for double transition zone REPAIR WELDINGs residual crackle uses is simple,
Flexible and convenient operation is easy to grasp, and is suitable for promoting.
Claims (10)
1. steel equipment parts are cracked (1), can not remove clean weldering again by the method for pair transition zone REPAIR WELDING residual crackle
Seam carries out REPAIR WELDING, it is characterised in that: the following steps are included:
S1, weld groove face and two sides are removed；
It is S2, the heat preservation of the high nickel electrode and austenitic electrode of nickel mass fraction >=90% is spare；
S3, groove and two sides are preheated；
S4, the high nickel electrode of selection weld nickelic transition zone (2) having at crackle (1), reselection intensity than nickelic transition zone (2) and
The high austenitic electrode of base material reinforcement of weld layer (3) on nickelic transition zone (2)；
S5, postheating are simultaneously kept the temperature；
After S6, weld seam are cooled to room temperature, the fusion of polishing welding seams and base material.
2. the method for double transition zone REPAIR WELDING residual crackles as described in claim 1, it is characterised in that: in step S1, clearly
Except water, rust, the oily impurity in 10~15mm of weld groove face and two sides.
3. the method for double transition zone REPAIR WELDING residual crackles as described in claim 1, it is characterised in that: high in step S2
The holding temperature of nickel electrode is 100~150 DEG C.
4. the method for double transition zone REPAIR WELDING residual crackles as described in claim 1, it is characterised in that:, will in step S3
200~250 DEG C are uniformly preheated within the scope of 200~300mm of groove and two sides.
5. the method for double transition zone REPAIR WELDINGs residual crackle as described in Claims 1 to 4 any claim, feature exist
In: in step S4, nickelic transition zone (2) and reinforcing layer (3) are all made of the welding sequence welding of backstep sequence, every segment length control
In 60~100mm, joint should be staggered at least 20mm system.
6. the method for double transition zone REPAIR WELDING residual crackles as claimed in claim 5, it is characterised in that: high in step S4
In nickel transition zone (2) and reinforcing layer (3) welding process, it is often soldered an electrode, carries out welding bead hammer with the hammer with round end immediately
It hits, first hammers among welding bead, then hammer the fusion of welding bead and base material, welding bead surface is made to be covered with point.
7. the method for double transition zone REPAIR WELDING residual crackles as claimed in claim 6, it is characterised in that: in step S4, fill out
Interlayer temperature should be controlled not less than preheating temperature with the welding of capping layer by filling.
8. the method for double transition zone REPAIR WELDING residual crackles as claimed in claim 5, it is characterised in that: high in step S4
Nickel transition zone (2) with a thickness of 4~6mm, reinforcing layer (3) is with a thickness of 5~7mm.
9. the method for double transition zone REPAIR WELDINGs residual crackle as described in Claims 1 to 4 any claim, feature exist
In: in step S5, postwelding is immediately heated to 300~350 DEG C, keeps the temperature 1~2h.
10. the method for double transition zone REPAIR WELDINGs residual crackle as described in Claims 1 to 4 any claim, feature
It is: in step S6, with the fusion of electric angle grinder reconditioning weld seam and base material, makes fusion rounding off；Or by weld seam
It is grinding into and is flushed with base material.
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Cited By (3)
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| CN112008172A (en) * | 2020-08-14 | 2020-12-01 | 山东蓬翔汽车有限公司 | Method for repairing superficial defects of iron casting |
| CN113953712A (en) * | 2021-10-11 | 2022-01-21 | 西安理工大学 | Material for butt welding of TA1-Q235 composite plates and welding method |
| CN114559206A (en) * | 2022-04-06 | 2022-05-31 | 天津市英源焊接技术有限公司 | Repairing method for repairing, welding and reinforcing cracks of engine room chassis of wind generating set |
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| CN114559206A (en) * | 2022-04-06 | 2022-05-31 | 天津市英源焊接技术有限公司 | Repairing method for repairing, welding and reinforcing cracks of engine room chassis of wind generating set |
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| CN110405375B (en) | 2021-08-24 |
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