CN106903404B - A kind of pre-treating method of austenitic stainless steel casting core pump case repair welding - Google Patents
A kind of pre-treating method of austenitic stainless steel casting core pump case repair welding Download PDFInfo
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- CN106903404B CN106903404B CN201710052949.XA CN201710052949A CN106903404B CN 106903404 B CN106903404 B CN 106903404B CN 201710052949 A CN201710052949 A CN 201710052949A CN 106903404 B CN106903404 B CN 106903404B
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- defect
- weld groove
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- repair welding
- polishing
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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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Abstract
The present invention provides a kind of pre-treating methods of austenitic stainless steel casting core pump case repair welding, specific steps include: defect determination, defect rough grinding, nondestructive inspection, asymmetric buff: defect is all after polishing, polishing by size more than or equal to the symmetrical position progress same degree of the defect of 15cm institute, forms symmetrical weld groove with defect；Refine after welding zone: the weld groove front after fine grinding is oval face, and the part within 30mm outside weld groove boundary is refined；Cleaning to welding zone: it removes to the polishing of 30mm internal cause, the remaining impurity of non-destructive testing, greasy dirt outside welding zone and weld groove boundary.Welding stress distribution is uniform after the method for the present invention ensures repair welding, and symmetrical residual stress can be with the generation of restrained deformation；On the other hand, the problem of the method for the present invention introduces less impurity element, repair welding area welding defect, welds so as to improve repair welding, avoids the generation of secondary defect, improves the success rate of austenitic stainless steel casting core pump case repair welding.
Description
Technical field
The present invention relates to the defect repair techniques field of core pump cast housing, in particular to a kind of austenitic stainless steel casting
The pre-treating method of core pump case repair welding.
Background technique
Austenitic stainless steel casting core pump case is bulky, structure is complicated, thereby increases and it is possible to can exist crackle, sand holes, be mingled with,
The casting flaws such as shrinkage cavity, loose, so the repair welding to rejected region will be inevitable；A kind of science is stringent and rationally effective difficult to understand
Family name's body stainless steel casting core pump case repair welding pre-treating method, is the important foundation of good casting flaw repair welding.
The pre-welding treatment of traditional repair welding to the segregation of this type austenitic stainless steel casting core pump case repair welding, incomplete fusion,
The elimination of the defects of not weld penetration, micro-crack is not comprehensive enough；The pretreatment mode of defect more than certain relative size is lacked
Mechanics is considered；It is not in place to stress direction after repair welding and distribution rationality guidance；Control to the impurity element that repair welding introduces
It is not efficient enough.
Summary of the invention
It is an object of the invention to solve above-mentioned technical problem, a kind of austenitic stainless steel casting core pump case repair welding is provided
Pre-treating method, can improve the austenitic stainless steel casting core pump case as caused by pre-treatment unreasonable before repair welding benefit
It post-weld stress direction and is unevenly distributed, introduces more impurity element, in the presence of the defect that ought especially have more than 15cm size
Processing mode.
In order to achieve the above objectives, the present invention provides a kind of pre-treatment sides of austenitic stainless steel casting core pump case repair welding
Method, the specific steps are as follows:
S1, defect determine: with the naked eye macroscopic view is a wide range of checks, marks to apparent defective locations；
The defect includes: crackle, sand holes, be mingled with, shrinkage cavity, loose etc.；The position for determining defect is pumped after guaranteeing repair welding
The primary place of body performance qualification.
S2, defect rough grinding: preliminary polishing removal processing is carried out to the fault location marked, is polished to and is invisible to the naked eye
Enter next step after obvious shortcoming；
S3, nondestructive inspection: to flaw detection is carried out non-destructive testing at the non-nuclear density gauge of surface, marking the fault location checked,
According to step S2 method, polish fault location；
S4, asymmetric buff: for defect all after polishing, the symmetrical position of defect institute by size more than or equal to 15cm carries out phase
With the polishing of degree, symmetrical weld groove is formed with the defect；
Since to pump each section symmetrical substantially centered on importing and exporting the plane of symmetry for core, so in order to preferably distribute welding
Stress is polished to the larger defect that the size having already appeared is more than 15cm using symmetrical, i.e., occurs biggish defect on one side, with
No matter its symmetrical another side corresponding position has zero defect that will be polished into symmetrical weld groove；
S5, refine to welding zone: by the defect or the smart polishing of defect symmetrical region progress by polishing, the weld groove after fine grinding is just
Face is oval face, and ellipse face minor axis length is the 1/3 of long axis length, and the weld groove boundary and former defect boundary are most
Small distance is 2~10mm, and the weld groove depth is more than or equal to depth of defect 2mm；By the portion within 30mm outside the weld groove boundary
Divide and refined, removes surface scale；
Refining stage of the present invention by treat the depth of welding zone, size, polishing radian make reasonable distribution, thus right
The distribution of weld seam during repair welding, the diffusion of welding heat, residual stress size there is one to efficiently control；
S6, the cleaning to welding zone: removing is polished to welding zone and its edge 30mm internal cause, non-destructive testing is remaining various miscellaneous
Matter, greasy dirt.
Further, in step S2, abrasive material uses diamond dust, aluminium oxide or diamond, and bruting process will successively be ground
It cuts, it is ensured that defect removal is clean；In general treatment process, the abrasive material of use needs to be new diamond dust, aluminium oxide, Buddha's warrior attendant
Stone material, or it is previously used for diamond dust, aluminium oxide, the diamond etc. of stainless steel or nickel-base material polishing.
Further, in step S3, the non-destructive testing selected area update strategy detects (PT), to guarantee surface cleaning before detection,
Such as find that small defect will be cut according to the layer-by-layer small range mill of step in S2, until no significant defect.
Further, in step S5, when flaw size is more than 15cm, the minimum on the weld groove boundary and former defect boundary
Distance is equal to 10mm；For larger defect, weld groove of polishing will execute the upper limit outside defect boundary, i.e. 10mm.Core pump size is very big,
But when defect that size is more than 15cm occur, opening the repair welding slot minimum dimension taken is 17cm, and the welding stress of direct repair welding can
It can cause core pump deformation；Need asymmetric buff repair welding to offset welding stress.
It further, is arc-shaped in the weld groove, radian is less than or equal to 120 degree, to be gently as far as possible in step S5
Good, the weld groove depth is less than or equal to weld groove short axleThe weld groove inner arc surface roughness is less than or equal to 12.5, with
Being not enough to hide is advisable into obvious greasy dirt or impurity.Weld groove should polish symmetrically, and appearance is preferably ellipse.
It further, will be to welding zone wiped clean with acetone in step S6.
Step S6 of the present invention is repeatedly wiped with the cloth impregnated in acetone
Only, the region within the entire oval weld groove region to be welded of cleaning and the outer 30mm in weld groove boundary, to remove the clast after polishing and residual
The greasy dirt stayed and other possible impurity.It, should before welding will be upper if having passed through 1h or more since having cleared up to welding
Region is stated to be cleaned with rag dipped in acetone again.
The present invention has the advantages that being provided a kind of for austenite stainless on the basis of common pre-welding treatment method
The pre-treating method of steel casting core pump case repair welding, motivated, rational and orderly, science are stringent and effective.Side of the present invention
Welding stress distribution is uniform after method ensures repair welding, when especially occurring more than the defect of 15cm, inputs sweating heat after direct repair welding
Excessive, residual stress is excessively high to be enough to influence core pump size, and after using the symmetrical repair welding of the method for the present invention, symmetrical residual stress can
With the generation of restrained deformation；On the other hand, the method for the present invention introduces less impurity element, repair welding area welding defect, to change
The problem of kind repair welding welding, the generation of secondary defect is avoided, austenitic stainless steel casting core pump case repair welding is improved
Success rate.
The present invention prevents from the minute inspection of defect to omit defect；Gradually polishing can prevent secondary defect for layering；
Cleaning can efficiently control the content of impurity element in weld seam；Arc weld groove can guarantee sweating heat be uniformly dispersed rationally, weld seam
It is readily formed；Symmetrical weld groove can improve the stress distribution after welding.By these effectively pre-treatments, repair welding weldering is improved
The problem of connecing, to improve the success rate of austenitic stainless steel casting core pump case repair welding.
Detailed description of the invention
Fig. 1 is core pump welding groove profile schematic three dimensional views；
Fig. 2 is the schematic top plan view of polishing weld groove；
Fig. 3 is the stereoscopic schematic diagram of polishing weld groove；
Fig. 4 is the practical photograph of comparative example 1；
Fig. 5 is the X-ray non-destructive testing figure of 1 weld seam of comparative example；
Fig. 6 is the scanning electron microscope (SEM) photograph of comparative example 1；
Fig. 7 is the practical photograph of 1 weld seam of embodiment；
Fig. 8 is the X-ray non-destructive testing figure of 1 weld seam of embodiment.
Specific embodiment
Combined with specific embodiments below to the pre-treating method of austenitic stainless steel casting core pump case repair welding of the invention
Technique is described further.
The pump housing of the size reduction of material of the same race casting technique of the same race is selected when experiment to simulate the repair welding of core pump case, is led to
Cross a batch welding procedure comparison welding result different from this standard test parameters.
Embodiment 1
The first step, defect determine: checking firstly, with the naked eye macroscopic view is a wide range of, check that apparent defective locations mark.
Defect rough grinding: second step carries out preliminary polishing removal processing to the fault location marked, is polished to naked eyes and sees
Until obvious shortcoming；Using diamond dust, aluminium oxide or diamond, bruting process will successively grind and cut, it is ensured that defect removal is dry
Only.
Nondestructive inspection: third step with Liquid penetrant testing (PT) method to flaw detection is carried out non-destructive testing at the non-nuclear density gauge of surface, is marked
Remember the fault location checked out, according to previous step method, polishes fault location.
4th step, asymmetric buff: to the biggish defect of appearance using symmetrical polishing, let it be, and that the plane of symmetry has is intact
Symmetrical weld groove will be polished by falling into.
Since to pump each section symmetrical substantially centered on importing and exporting the plane of symmetry for core, as shown in Figure 1, so in order to more preferable
Distribution welding stress, to the size having already appeared be more than 15cm larger defect using symmetrical polishing, i.e., one side occur compared with
Big defect, no matter there is zero defect that will be polished into symmetrical weld groove with its symmetrical another side corresponding position.
5th step is refined to welding zone: the fault location essence of rough grinding being polished, the depth, size, side of welding zone are mainly treated
Reasonable distribution is done to the radian of, polishing, and polishing pattern is as shown in Fig. 2, groove perspective view such as Fig. 3 of fine grinding is elliposoidal；Weldering
Slot front is oval face, and ellipse face minor axis length is the 1/3 of long axis length, weld groove outer boundary and defect
Actual boundary distance is more than or equal to 2mm, and the weld groove groove depth is more than or equal to depth of defect 2mm；By 30mm outside the weld groove boundary
Within part refined；It is arc-shaped in weld groove, radian is less than or equal to 120 degree, and preferably as far as possible gently, the weld groove is deep
Degree is less than or equal to 1/ √ 3 of weld groove short axle half, and the weld groove inner arc surface roughness is less than or equal to 12.5, until being not enough to hide into bright
Until aobvious greasy dirt or impurity.
The cleaning to welding zone: 6th step is removed to impurity, the greasy dirt etc. in welding zone and its edge at least 30mm.
Welding: 7th step is repaired these grooves using manual electric arc welding and is welded.
Comparative example 1
The sample of another part only polish defective place and to polishing and cleaning do not do obvious requirement, as a comparison
Example.
The weld seam slice of the sample welded respectively to embodiment 1, comparative example 1 carries out naked eyes macro -graph, and is scanned
Electronic Speculum detection, X-ray detection, are detected for convenience and observation has the defects of pore-free, impurity element, and welding is in strip herein.
Through detecting, there is stomata such as Fig. 4 and Fig. 5 institute in the sample weld seam that comparative example 1 is not cleared up strictly by this standard before welding
Show and there is impurity to be mixed into, Fig. 6 is the component distributing figure of 1 scanning electron microscope of comparative example detection, by element line distribution as can be seen that base
Element of volume and fault location gap are huge, illustrate have impurity element to be mixed into；What the unqualified embodiment 1 of sample was cleared up before welding according to standard
Sample, without stomata (as shown in Figure 7), also free from admixture element is mixed into, as shown in figure 8, finding weld seam through X-ray non-destructive testing
It is intact, welding defect, sample qualification.
The core of repair welding is pumped compared with former design size: change in size < 1cm is pumped using the sample core of asymmetric buff repair welding,
It substantially conforms to require, sample is qualified；The sample of asymmetric buff is not used, size > 3cm changes greatly, and sample is unqualified, knot
Fruit such as the following table 1:
The welding result that the different pretreatment mode of table 1 obtains
It follows that the pump case weldquality by the method for the present invention processing is good from the result of welding, welding is answered
Power is evenly distributed, and the postwelding pump housing does not find size distortion；There is gas hole defect in the pump housing weld seam of conventional pretreatment mode, sweeps
It describes with the presence of impurity element, and has the defect of omission, pump housing size has change compared with design size after large scale defect repair welding
Change, may be decreased the precision of pump, influences the use of pump.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of pre-treating method of austenitic stainless steel casting core pump case repair welding, which is characterized in that specific step is as follows:
S1, defect determine: with the naked eye macroscopic view is a wide range of checks, marks to apparent defective locations；
S2, defect rough grinding: preliminary polishing removal processing is carried out to the fault location marked, is polished to and is invisible to the naked eye obviously
Enter next step after defect；
S3, nondestructive inspection: to flaw detection is carried out non-destructive testing at the non-nuclear density gauge of surface, marking the fault location checked, according to
Step S2 method polishes to fault location；
S4, asymmetric buff: size all after polishing, centered on importing and exporting the plane of symmetry symmetrically, is more than or equal to 15cm's by defect
Defect symmetrical position carry out the polishing of same degree, form symmetrical weld groove with the defect；
S5, refine to welding zone: by the defect or the smart polishing of defect symmetrical region progress by polishing, the weld groove front after fine grinding is
Oval face, ellipse face minor axis length is the 1/3 of long axis length, the most narrow spacing on the weld groove boundary and former defect boundary
From for 2~10mm, the weld groove depth is more than or equal to depth of defect 2mm；By the part within 30mm outside the weld groove boundary into
Row fine grinding, removes surface scale；
S6, the cleaning to welding zone: it removes to the polishing of 30mm internal cause, the remaining impurity of non-destructive testing, oil outside welding zone and weld groove boundary
It is dirty.
2. the pre-treating method of austenitic stainless steel casting core pump case repair welding according to claim 1, which is characterized in that step
In rapid S2, abrasive material uses diamond dust, aluminium oxide or diamond；Bruting process will successively grind and cut.
3. the pre-treating method of austenitic stainless steel casting core pump case repair welding according to claim 1, which is characterized in that step
In rapid S3, the non-destructive testing selected area update strategy detection.
4. the pre-treating method of austenitic stainless steel casting core pump case repair welding according to claim 1, which is characterized in that step
In rapid S5, when flaw size is more than 15cm, the minimum range on the weld groove boundary and former defect boundary is 10mm.
5. the pre-treating method of austenitic stainless steel casting core pump case repair welding according to claim 1, which is characterized in that step
It is arc-shaped in the weld groove in rapid S5, radian is less than or equal to 120 degree, preferably as far as possible gently, the weld groove depth is less than etc.
In 1/2 √ 3 of weld groove short axle, the weld groove inner arc surface roughness is less than or equal to 12.5.
6. the pre-treating method of austenitic stainless steel casting core pump case repair welding according to claim 1, which is characterized in that step
It, will be to welding zone wiped clean with acetone in rapid S6.
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| CN201710052949.XA CN106903404B (en) | 2017-01-22 | 2017-01-22 | A kind of pre-treating method of austenitic stainless steel casting core pump case repair welding |
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| CN201710052949.XA CN106903404B (en) | 2017-01-22 | 2017-01-22 | A kind of pre-treating method of austenitic stainless steel casting core pump case repair welding |
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| CN110465728B (en) * | 2019-08-05 | 2021-01-19 | 大连理工大学 | Repeated welding process for high-power shielding type nuclear main pump C-shaped sealing structure component |
| CN112548382A (en) * | 2020-03-31 | 2021-03-26 | 中车青岛四方机车车辆股份有限公司 | Defect welding repair process for arc surface welding seam |
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| CN100544879C (en) * | 2007-12-03 | 2009-09-30 | 鞍钢重型机械有限责任公司金属结构厂 | Blanking of large torpedo jar and assembly welding method |
| CN103894702B (en) * | 2014-04-10 | 2016-04-06 | 大唐山东电力检修运营有限公司 | A kind of rotor web crackle welding repair method |
| CN103949757B (en) * | 2014-05-08 | 2016-03-02 | 中国航空工业集团公司北京航空材料研究院 | Argon arc welding is adopted to repair the process of Titanium Alloy Aircraft slide rail pit |
| CN105643182A (en) * | 2014-11-14 | 2016-06-08 | 重庆春顾机械制造有限公司 | Alloy pipeline repair process |
| CN104842118A (en) * | 2015-05-28 | 2015-08-19 | 南通市电站阀门有限公司 | Repair welding process for valves |
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