CN105081517A - Excavating-out method for loose defect of large steel casting material - Google Patents
Excavating-out method for loose defect of large steel casting material Download PDFInfo
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- CN105081517A CN105081517A CN201510464216.8A CN201510464216A CN105081517A CN 105081517 A CN105081517 A CN 105081517A CN 201510464216 A CN201510464216 A CN 201510464216A CN 105081517 A CN105081517 A CN 105081517A
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- defect
- gouge
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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
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to an excavating-out method for defects of steel castings, in particular to an excavating-out method for a loose defect of a large steel casting material. The method includes the steps that in shrinkage porosity defect NDT detection, a three-dimensional plate method is adopted for identification, a whole casting is preheated, and the defect is excavated out in a gouging manner. The excavating-out method is unique, the defect is excavated out through the minimum soldering amount, the situation of lamellar tearing caused by welding is avoided, the repair pass percent is increased, and the repair frequency is decreased.
Description
Technical field
What the present invention relates to a kind of cast steel part defect excavates method, and what especially relate to that a kind of large-scale steel-casting material loosens class defect excavates method.
Background technology
In recent years, along with the production-scale expanding day of National Industrial, the demand of state key industry to large-scale steel-casting is increasing, and the weight of single foundry goods is more and more heavier, product quality and require also more and more higher.After large-scale steel-casting solidifies end, often there is gross segregation, coarse grains problem at the thick and large section of rising head root or foundry goods, be referred to as " material is loosened ", this kind of problem is particularly serious in thick and large section casting parts.
Material is loosened and is resulted from a coarse grains being formed in casting solidification process and with nonmetallic field trash, be often detected with shrinkage porosite, strip defective form, and its position produced generally is positioned at shrinkage defect, strip defect root or its both sides.Because this shortcoming belongs to non-broad perspectives defect, usually all cannot be detected by outward appearance detection, Magnetic testing or Liquid penetrant testing, can not be removed completely when defect processing.The routine method of excavating of this kind of defect in defect sign, digs scarce mode with gouge at normal temperatures to carry out, but after gouge, local produces extensibility crackle, and defect gouge amount often reaches 2 ~ 3 times of former sign volume, even larger, cause welding capacity to be multiplied, work on the spot amount significantly increases.
Also do not overcome the method for above-mentioned defect at present.
Summary of the invention
The object of the invention is the defect overcoming prior art, thering is provided a kind of method unique, excavate defect with minimum soldering amount, avoiding because welding the generation causing lamellar tearing situation, improve and reprocess qualification rate, that reduces that a kind of large-scale steel-casting material of number of rewelding loosens class defect excavates method.
The present invention realizes in the following way:
What large-scale steel-casting material loosened class defect excavates a method, it is characterized in that: the method is shrinkage defect NDT when detecting, and the method adopting 3 D stereo to mark on a map carries out identifying, then by overall for foundry goods preheating, finally adopting gouge mode to carry out defect and excavate;
Described for high alloy material, as depth of defect>=30mm and area>=50dm
2time, foundry goods entirety is preheated to 150 ~ 200 DEG C and carries out defect gouge, during gouge, interlayer temperature controls within 300 DEG C; For low-alloy and carbon steel, as depth of defect>=100mm and area>=500dm
2time, defect periphery 250mm scope entirety is preheated to 100 ~ 180 DEG C and carries out defect gouge, during gouge, interlayer temperature controls within 300 DEG C;
As depth of defect > 100mm, adopt layering gradation gouge mode to carry out defect and excavate, the defect employing diameter near cast(ing) surface 50mm is
carbon-point gouge; More than the defect of 50mm, then select different-diameter carbon-point gouge according to defect situation, if defect inside still exists macroscopic crackle, first select diameter to be
carbon-point gouge defect periphery, after making it to form crack arrest circle, re-using diameter is
carbon-point crack arrest circle internal fissure position gouge is excavated totally, gouge still carries out according to layering gradation principle, when gouge to be invisible to the naked eye defect time stop gouge immediately, and whether defect is removed totally to utilize the method for relief grinding iron adsorption crackle mouth to judge, if need to continue gouge, repeat said method, layering gradation gouge;
Described gouge amount every layer≤5mm, at every turn can only gouge 20 ~ 30mm.
The present invention has following effect:
1) method is unique: when method provided by the invention is shrinkage defect NDT detection, and the method adopting 3 D stereo to mark on a map carries out identifying, then by overall for foundry goods preheating, finally adopting gouge mode to carry out defect and excavate; Because shrinkage porosite position easily causes crack growth when being subject to high temperature instantaneously, therefore need when defect is dug out to carry out suitable preheating according to the factor such as size, material of defect, poor to reduce defect peripheral temperature, reduce slow cooling speed, reduce defect secondary cracking probability.For high alloy material, as depth of defect>=30mm and area>=50dm
2time, foundry goods entirety is preheated to 150 ~ 200 DEG C and carries out defect gouge.During gouge, interlayer temperature controls within 300 DEG C.For low-alloy and carbon steel, as depth of defect>=100mm and area>=500dm
2time, defect periphery 250mm scope entirety is preheated to 100 ~ 180 DEG C and carries out defect gouge.During gouge, interlayer temperature controls within 300 DEG C.
2) excavate defect with minimum soldering amount, avoid because welding causes the generation of lamellar tearing situation to be contracted: the UT location of method pine defect provided by the invention adopts three-dimensional graphic technique to indicate, the clear and definite defect shape of convenient operation person and size; Carry out digging scarce under various preheat temperature condition according to the factor such as size, material of defect, poor to reduce defect peripheral temperature, reduce slow cooling speed, reduce the probability of defect secondary cracking; By choose reasonable gouge carbon-point diameter and layering gradation gouge the most at last defect excavate totally.
3) in method actual production provided by the invention, by scheme provided by the invention, single rarefaction defect welding capacity can reduce about 20% ~ 30%, effectively reduces welding job amount, reduces castings production cost.
Detailed description of the invention
What large-scale steel-casting material loosened class defect excavates a method, comprises the steps:
1) defect UT location
When shrinkage defect NDT detects, the method adopting 3 D stereo to mark on a map identifies, and gouge personnel only need carry out gouge to identification division.
Because shrinkage porosite position easily causes crack growth when being subject to high temperature instantaneously, therefore need when defect is dug out to carry out suitable preheating according to the factor such as size, material of defect, poor to reduce defect peripheral temperature, reduce slow cooling speed, reduce defect secondary cracking probability.
For high alloy material, as depth of defect>=30mm and area>=50dm
2time, foundry goods entirety is preheated to 150 ~ 200 DEG C and carries out defect gouge.During gouge, interlayer temperature controls within 300 DEG C.
For low-alloy and carbon steel, as depth of defect>=100mm and area>=500dm
2time, defect periphery 250mm scope entirety is preheated to 100 ~ 180 DEG C and carries out defect gouge.During gouge, interlayer temperature controls within 300 DEG C.
2) defect is excavated
As depth of defect > 100mm, adopt layering gradation gouge mode to carry out defect and excavate.Defect employing diameter near cast(ing) surface 50mm is
carbon-point gouge; More than the defect of 50mm, then select different-diameter carbon-point gouge according to defect situation, if defect inside still exists macroscopic crackle, first select diameter to be
carbon-point gouge defect periphery, after making it to form crack arrest circle, re-using diameter is
carbon-point crack arrest circle internal fissure position gouge is excavated totally, gouge still carries out according to layering gradation principle.When gouge to be invisible to the naked eye defect time stop gouge immediately, and utilize the method for relief grinding iron adsorption crackle mouth judge defect whether remove totally.If need to continue gouge, repeat said method, layering gradation gouge.
Gouge amount every layer≤5mm, at every turn can only gouge 20 ~ 30mm, to reduce heat input, avoids the micro-crack caused because local temperature is too high to continue cracking, spread.
Claims (4)
1. what a large-scale steel-casting material loosened class defect excavates method, it is characterized in that: when the method is shrinkage defect NDT detection, the method adopting 3 D stereo to mark on a map carries out identifying, then by overall for foundry goods preheating, finally adopting gouge mode to carry out defect and excavate.
2. what a kind of large-scale steel-casting material as claimed in claim 1 loosened class defect excavates method, it is characterized in that: described for high alloy material, as depth of defect>=30mm and area>=50dm
2time, foundry goods entirety is preheated to 150 ~ 200 DEG C and carries out defect gouge, during gouge, interlayer temperature controls within 300 DEG C; For low-alloy and carbon steel, as depth of defect>=100mm and area>=500dm
2time, defect periphery 250mm scope entirety is preheated to 100 ~ 180 DEG C and carries out defect gouge, during gouge, interlayer temperature controls within 300 DEG C.
3. what a kind of large-scale steel-casting material as claimed in claim 1 loosened class defect excavates method, it is characterized in that: as depth of defect > 100mm, adopt layering gradation gouge mode to carry out defect to excavate, the defect employing diameter near cast(ing) surface 50mm is
carbon-point gouge; More than the defect of 50mm, then select different-diameter carbon-point gouge according to defect situation, if defect inside still exists macroscopic crackle, first select diameter to be
carbon-point gouge defect periphery, after making it to form crack arrest circle, re-using diameter is
carbon-point crack arrest circle internal fissure position gouge is excavated totally, gouge still carries out according to layering gradation principle, when gouge to be invisible to the naked eye defect time stop gouge immediately, and whether defect is removed totally to utilize the method for relief grinding iron adsorption crackle mouth to judge, if need to continue gouge, repeat said method, layering gradation gouge.
4. what a kind of large-scale steel-casting material as claimed in claim 3 loosened class defect excavates method, it is characterized in that: described gouge amount every layer≤5mm, at every turn can only gouge 20 ~ 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510464216.8A CN105081517A (en) | 2015-07-31 | 2015-07-31 | Excavating-out method for loose defect of large steel casting material |
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| CN201510464216.8A CN105081517A (en) | 2015-07-31 | 2015-07-31 | Excavating-out method for loose defect of large steel casting material |
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| CN201510464216.8A Pending CN105081517A (en) | 2015-07-31 | 2015-07-31 | Excavating-out method for loose defect of large steel casting material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10583490B2 (en) | 2017-07-20 | 2020-03-10 | General Electric Company | Methods for preparing a hybrid article |
| CN111922496A (en) * | 2020-08-11 | 2020-11-13 | 四川工程职业技术学院 | Workpiece defect eliminating method and system based on plasma air gouging |
| CN115502528A (en) * | 2022-10-21 | 2022-12-23 | 吴忠市黄河电焊机有限公司 | Plasma arc gouging device for efficiently removing wear-resistant layer of large-sized compression roller |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2771460B2 (en) * | 1994-09-16 | 1998-07-02 | 新日本製鐵株式会社 | How to care for billets |
| CN1576829A (en) * | 2003-07-09 | 2005-02-09 | 通用电气公司 | System and method for analyzing and identifying flaws in a manufactured part |
| CN1923444A (en) * | 2006-09-22 | 2007-03-07 | 四川东风电机厂有限公司 | Hydraulic turbine rotary wheel palm axle head defect handling method |
| CN103962791A (en) * | 2013-02-01 | 2014-08-06 | 哈尔滨建成集团有限公司 | Welding repair method for large-sized heat-resistant steel castings |
| CN104439876A (en) * | 2014-09-29 | 2015-03-25 | 宁夏共享铸钢有限公司 | Method for repairing defects of pipe orifice of high-alloy hollow valve shell casting |
| CN104515786A (en) * | 2015-01-08 | 2015-04-15 | 北京科技大学 | Method for detecting and analyzing internal defect evolution of metal casting in fatigue process |
-
2015
- 2015-07-31 CN CN201510464216.8A patent/CN105081517A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2771460B2 (en) * | 1994-09-16 | 1998-07-02 | 新日本製鐵株式会社 | How to care for billets |
| CN1576829A (en) * | 2003-07-09 | 2005-02-09 | 通用电气公司 | System and method for analyzing and identifying flaws in a manufactured part |
| CN1923444A (en) * | 2006-09-22 | 2007-03-07 | 四川东风电机厂有限公司 | Hydraulic turbine rotary wheel palm axle head defect handling method |
| CN103962791A (en) * | 2013-02-01 | 2014-08-06 | 哈尔滨建成集团有限公司 | Welding repair method for large-sized heat-resistant steel castings |
| CN104439876A (en) * | 2014-09-29 | 2015-03-25 | 宁夏共享铸钢有限公司 | Method for repairing defects of pipe orifice of high-alloy hollow valve shell casting |
| CN104515786A (en) * | 2015-01-08 | 2015-04-15 | 北京科技大学 | Method for detecting and analyzing internal defect evolution of metal casting in fatigue process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10583490B2 (en) | 2017-07-20 | 2020-03-10 | General Electric Company | Methods for preparing a hybrid article |
| CN111922496A (en) * | 2020-08-11 | 2020-11-13 | 四川工程职业技术学院 | Workpiece defect eliminating method and system based on plasma air gouging |
| CN115502528A (en) * | 2022-10-21 | 2022-12-23 | 吴忠市黄河电焊机有限公司 | Plasma arc gouging device for efficiently removing wear-resistant layer of large-sized compression roller |
| CN115502528B (en) * | 2022-10-21 | 2024-01-16 | 吴忠市黄河电焊机有限公司 | Plasma arc gouging device for efficiently removing wear-resistant layer of large-sized compression roller |
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