CN109483149A - A kind of restorative procedure of EQ51 ultra-high tensile steel welding crackle - Google Patents
A kind of restorative procedure of EQ51 ultra-high tensile steel welding crackle Download PDFInfo
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- CN109483149A CN109483149A CN201811274455.7A CN201811274455A CN109483149A CN 109483149 A CN109483149 A CN 109483149A CN 201811274455 A CN201811274455 A CN 201811274455A CN 109483149 A CN109483149 A CN 109483149A
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- Prior art keywords
- repair welding
- crackle
- weld seam
- welding
- gouge groove
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a kind of restorative procedures of EQ51 ultra-high tensile steel welding crackle, and in two sidetracking stop hole of crackle before repair welding, cracked extension and crackle orthogenesis in crack forming mechanism process and process of patch weld can be effectively prevented；And, the mode that the restorative procedure uses carbon arc air gouging and mechanical grinding to combine is purged crackle to form gouge groove, and gouge groove is detected in the way of Magnetic testing and whether surrounding crackle removes completion, the quality that may insure crack forming mechanism repair welding guarantees the successful of crack forming mechanism.
Description
Technical field
The present invention relates to traces to connect repairing for crack forming mechanism technical field more particularly to a kind of rigid weld crack of EQ51 superhigh intensity
Compound method.
Background technique
Lifting basis is the important load-carrying construction of self-elevating drilling platform, provides support for the fixation of platform leg, together
When be also platform leg oscilaltion transmitting power, the material of main load-carrying construction is the super guiding principle strength steel of EQ51, this be by
In EQ51 unimach intensity with higher, good low temperature impact properties, and welding node is mostly deep penetration welding or complete
Weld seam is penetrated, so that three-dimensional stress feature is presented in welding point stress, therefore, when welding process parameter controls improperly
It is easy the base material region surface near weld seam or weld seam and forms the welding defect of welding cold cracking, and weld seam is carried out in the later period
During crack forming mechanism, if renovation technique is unreasonable, crack propagation or crackle orthogenesis are easily caused, influencing connector makes
With performance, while increasing crack forming mechanism cost.
Summary of the invention
For overcome the deficiencies in the prior art, technical problem solved by the invention is to provide a kind of EQ51 unimach
The cracked expansion in weld crack repair process and process of patch weld not only can be effectively prevented in the restorative procedure of weld crack
Exhibition and crackle orthogenesis, it is ensured that the quality of crack forming mechanism repair welding guarantees the successful of crack forming mechanism.
In order to solve the above technical problems, the technical solution adopted in the present invention content is specific as follows:
A kind of restorative procedure of EQ51 ultra-high tensile steel welding crackle comprising following steps:
S1: detecting weld crack by the way of Magnetic testing, to determine crack position and crack length, and
Bore stop hole in crackle both ends；
S2: the mode for using carbon arc air gouging and mechanical grinding to combine is purged crackle to form gouge groove, and
Gouge groove is detected in the way of Magnetic testing and whether surrounding crackle removes completion；
S3: the pre-heat treatment is carried out to gouge groove, and the preheated zone of gouge groove is including at least gouge groove two
The region of side 75mm；
S4: hydrogen controlled electrode of the diameter for 3.2mm and yield strength not less than 500MPa is selected to mend gouge groove
Weldering forms repair welding weld seam.
S5: heat preservation slow cooling processing is carried out to repair welding weld seam；
S6: after repair welding weld seam is cooling, grinding process is carried out to repair welding weld seam by the way of mechanical grinding, to ensure to mend
Metal smooth transition around welding line and repair welding weld seam；
S7: detecting repair welding weld seam by the way of Magnetic testing, to ensure that repair welding weld seam does not have crackle.
Further, in step s 4, it before carrying out repair welding to gouge groove, needs to hydrogen controlled electrode at 350-400 DEG C
At a temperature of baked, baking time be 2 hours, be placed on after baking spare in insulation barrel.
Further, when carrying out repair welding to gouge groove, the striking position of hydrogen controlled electrode is before solder joint at 10mm
On gouge groove.
Further, in step s 4, welding current when carrying out repair welding to gouge groove is 110-150A, weldingvoltage
For 20-25V, temperature is more than or equal to the preheating temperature of gouge groove and is less than or equal to 200 DEG C between road.
Further, in step s 5, carrying out heat preservation slow cooling processing to repair welding weld seam is by the repair welding commissure
Place heat-preservation cotton.
Compared with prior art, the beneficial effects of the present invention are:
The restorative procedure of EQ51 ultra-high tensile steel welding crackle of the present invention stops before repair welding in two sidetracking of crackle
Cracked extension and crackle orthogenesis in crack forming mechanism process and process of patch weld can be effectively prevented in ceasma；The reparation
The mode that method uses carbon arc air gouging and mechanical grinding to combine is purged crackle to form gouge groove, and utilizes magnetic powder
The mode of detection detects gouge groove and whether surrounding crackle removes completion, it can be ensured that the quality of crack forming mechanism repair welding,
Guarantee the successful of crack forming mechanism.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the flow diagram of the restorative procedure of EQ51 ultra-high tensile steel welding crackle of the present invention.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to specific embodiment, structure, feature and its effect according to the present invention, detailed description are as follows:
The restorative procedure of EQ51 ultra-high tensile steel welding crackle of the present invention as shown in Fig. 1 comprising as follows
Step:
S1: detecting weld crack by the way of Magnetic testing, to determine crack position and crack length, and
Bore stop hole in crackle both ends；
It should be noted that boring stop hole at crackle both ends can be effectively prevented in crack forming mechanism process and process of patch weld
Cracked extension and crackle orthogenesis.
S2: the mode for using carbon arc air gouging and mechanical grinding to combine is purged crackle to form gouge groove, and
Gouge groove is detected in the way of Magnetic testing and whether surrounding crackle removes completion；
S3: the pre-heat treatment is carried out to gouge groove, and the preheated zone of gouge groove is including at least gouge groove two
The region of side 75mm；
It should be noted that in the present invention, preheating temperature when carrying out the pre-heat treatment to gouge groove refers to AWS
D1.1/D1.1M (Structural Welding Code-Steel) standard, specifically: when plate thickness is less than or equal to 20mm, in advance
Hot temperature is not less than 10 DEG C；When plate thickness is greater than 20mm and is less than or equal to 38mm, preheating temperature is not less than 65 DEG C；When plate thickness is greater than
38mm and be less than or equal to 65mm when, preheating temperature be not less than 110 DEG C；When plate thickness is greater than 65mm, preheating temperature is not less than 150
℃。
S4: hydrogen controlled electrode of the diameter for 3.2mm and yield strength not less than 500MPa is selected to mend gouge groove
Weldering forms repair welding weld seam, this is because yield strength >=500MPa of EQ51 unimach, tensile strength 610-770MPa,
Elongation >=16%, -40 DEG C of impact absorbing energy energy >=50J, and the yield strength and tensile strength of welding rod are wanted when being welded
Greater than or equal to the yield strength of EQ51 unimach, therefore, in the present invention, select diameter for 3.2mm and rank it is not low
Repair welding is carried out to gouge groove in the hydrogen controlled electrode of E9018M-H4R, and when repair welding by the way of multi-pass welding.
S5: heat preservation slow cooling processing is carried out to repair welding weld seam；
S6: after repair welding weld seam is cooling, grinding process is carried out to repair welding weld seam by the way of mechanical grinding, to ensure to mend
Metal smooth transition around welding line and repair welding weld seam；
S7: detecting repair welding weld seam by the way of Magnetic testing, to ensure that repair welding weld seam does not have crackle.
In step s 4, to gouge groove carry out repair welding before, need to hydrogen controlled electrode 350-400 DEG C at a temperature of into
Row bakes, and baking time is 2 hours, is placed on after baking spare in insulation barrel.
In the present invention, when carrying out repair welding to gouge groove, the striking position of hydrogen controlled electrode is the 10mm before playing solder joint
On the gouge groove at place, electric arc solder joint is moved on into then after stablizing electric arc and has been welded, this is because welding rod at arcing point
The welding defects such as the not sufficiently reactive stomata easy to form of coating, crackle, the striking outside gouge groove, not only unsightly, equally
Unavoidably it will appear welding defect, therefore, the striking at 10mm before playing solder joint, and electric arc has been moved on into weldering after stablizing electric arc
Point is welded, it is possible to prevente effectively from welding defect.
In step s 4, welding current when carrying out repair welding to gouge groove is 110-150A, weldingvoltage 20-25V,
Temperature is more than or equal to the preheating temperature of gouge groove and is less than or equal within the temperature range of 200 DEG C between road；As further preferred
Embodiment, welding current when carrying out repair welding to gouge groove is 113-144A, weldingvoltage 21-24V, temperature between road
More than or equal to gouge groove preheating temperature and be less than or equal to 200 DEG C within the temperature range of.
In the present embodiment, in order to illustrate temperature welds repair welding weld seam between welding current, weldingvoltage and road when repair welding
The influence of effect is connect, inventor has carried out qualification of welding procedure experiment, and experimentation is as follows:
1, choice experiment material:
(1) base material: EQ51 material is selected, with a thickness of 32mm.Its chemical component are as follows: C0.08%, Si0.13%,
Mn1.4%, P0.01%, S0.001%.Its yield strength is 671MPa (>=500MPa), and tensile strength is 680MPa (610-
770MPa), elongation is 20% (>=16%), -40 DEG C of impact absorbing energy energy 324J (>=50J).Its condition of delivery is quenching
Add-back fire.
(2) it selects welding rod: selecting the trade mark for the HOBALLOY 9018-M (E9018M-H4R of AWS A5.5/A5.5M standard
Model), the hydrogen controlled electrode of specification Φ 3.2mm, chemical component are as follows: C0.04%, Si0.20%, Mn0.89%,
P0.018%, S0.012%.Its deposited metal yield strength be 583MPa, tensile strength 672MPa, elongation 24% ,-
50 DEG C of impact absorbing energy energy 81J.
2, it for three kinds of horizontal position welding, vertical position welding and overhead welding welding positions, selects between different welding currents, weldingvoltage and road
Temperature carries out three group welding experiments, and specific experiment data are as shown in table 1:
Table 1
3, connector physical and chemical experiment is carried out to soldered repair welding weld seam, it should be noted that connector Physicochemical test result
It should meet claimed below:
(1) tension test: connector tensile strength should be not less than base material standard value 610MPa；
(2) bend test: banjo fixing butt jointing is bent 180 °, and the shortcoming greater than 3mm should not occur in specimen surface；
(3) low-temperature impact test: -40 DEG C of ballistic work average values of butt weld are not less than 33J.
(4) hardness test；Connector hardness is not more than 420HV10；
(5) low power metallographic test: connector cross section should not have the welding defects such as incomplete fusion, lack of penetration, stomata, crackle.
The results are shown in Table 2 for specific experiment:
Table 2
Remarks:
1. the serial number in serial number and table 1 in table 2 corresponds；
2. WM indicates that Weld pipe mill, FL indicate that fusion line position, FL+1 indicate the heat affected area of the outer 1mm of melt run, FL+2
Indicate the heat affected area of the outer 2mm of melt run, FL+5 indicates the heat affected area of the outer 5mm of melt run.
4, experiment conclusion
(1) strength of joint
Each group strength of joint is above base material standard value it can be seen from each group joint straight draw test result.
(2) connector plasticity
Lacking greater than 3mm is not present in its surface after 180 ° of sample bendings it can be seen from each group joint flex test result
It owes.
(3) impact flexibility
According to each group connector low-temperature impact test as a result, the average impact function of -40 DEG C of each group banjo fixing butt jointing is not less than
33J。
(4) hardness
Each group connector hardness test the result shows that, the hardness in each area of connector is below standard value 420HV10.
(5) macroscopical section
It is good to can be seen that the fusion of each group weld seam from welding point macroscopic view section acid etching sample, flawless, stomata, be mingled with,
The welding defects such as slag inclusion.
The result shows that three groups of welderings comment sample to be all satisfied AWS D1.1/D1.1M (Structural Welding Code-
Steel acceptance criteria requirement) when base material has impact to require, can cover EQ51 material of the plate thickness more than or equal to 16mm
SMAW all-position welding；When base material is required without impact, the SMAW all positon of EQ51 material of the plate thickness more than or equal to 3mm can be covered
Welding.
In conclusion when welding rod be diameter be 3.2mm, yield strength be not less than 500MPa hydrogen controlled electrode when, welding
Connecing electric current is 113-144A, weldingvoltage 21-24V, and temperature is more than or equal to the preheating temperature of gouge groove and is less than etc. between road
When being welded under 200 DEG C of welding condition, it can meet related request.
In step s 5, carrying out heat preservation slow cooling processing to repair welding weld seam is kept the temperature by placing in the repair welding commissure
Cotton.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (5)
1. a kind of restorative procedure of EQ51 ultra-high tensile steel welding crackle, which comprises the steps of:
S1: detecting weld crack by the way of Magnetic testing, to determine crack position and crack length, and in crackle
Bore stop hole in both ends；
S2: the mode for using carbon arc air gouging and mechanical grinding to combine is purged crackle to form gouge groove, and utilizes
The mode of Magnetic testing detects gouge groove and whether surrounding crackle removes completion；
S3: the pre-heat treatment is carried out to gouge groove, and the preheated zone of gouge groove is including at least gouge groove two sides
75mm；
S4: selecting diameter for 3.2mm and yield strength, the hydrogen controlled electrode not less than 500MPa carries out repair welding to gouge groove,
Form repair welding weld seam；
S5: heat preservation slow cooling processing is carried out to repair welding weld seam；
S6: after repair welding weld seam is cooling, carrying out grinding process to repair welding weld seam by the way of mechanical grinding, to ensure that repair welding is welded
Metal around seam and repair welding weld seam seamlessly transits；
S7: detecting repair welding weld seam by the way of Magnetic testing, to ensure that repair welding weld seam does not have crackle.
2. restorative procedure as described in claim 1, which is characterized in that in step s 4, before carrying out repair welding to gouge groove, need
Will to hydrogen controlled electrode 350-400 DEG C at a temperature of bake, baking time be 2 hours, insulation barrel is placed on after baking
In it is spare.
3. restorative procedure as described in claim 1, which is characterized in that when carrying out repair welding to gouge groove, hydrogen controlled electrode
Striking position is on the gouge groove before playing solder joint at 10mm.
4. restorative procedure as described in claim 1, which is characterized in that in step s 4, when to the progress repair welding of gouge groove
Welding current is 110-150A, weldingvoltage 20-25V, and temperature is more than or equal to the preheating temperature of gouge groove and is less than between road
Equal to 200 DEG C.
5. restorative procedure as described in claim 1, which is characterized in that in step s 5, carry out heat preservation slow cooling to repair welding weld seam
Processing is by placing heat-preservation cotton in the repair welding commissure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811274455.7A CN109483149A (en) | 2018-10-30 | 2018-10-30 | A kind of restorative procedure of EQ51 ultra-high tensile steel welding crackle |
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| CN201811274455.7A CN109483149A (en) | 2018-10-30 | 2018-10-30 | A kind of restorative procedure of EQ51 ultra-high tensile steel welding crackle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110814632A (en) * | 2019-09-29 | 2020-02-21 | 广州黄船海洋工程有限公司 | Surfacing process method for cast steel anchor lip line type repair |
| CN112355567A (en) * | 2020-11-11 | 2021-02-12 | 广西柳州钢铁集团有限公司 | Method for repairing cracks of bogie of metallurgical railway diesel locomotive |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1911583A (en) * | 2006-08-23 | 2007-02-14 | 四川东风电机厂有限公司 | Repairing welding method for crack of rotor support power generator |
| CN101890610A (en) * | 2010-08-09 | 2010-11-24 | 中信重工机械股份有限公司 | Field repairing method of welding cracks of feeding slip-ring body of large-sized slide mill |
| CN102632321A (en) * | 2012-04-23 | 2012-08-15 | 湖南华菱湘潭钢铁有限公司 | Process for welding and repairing cracks of roller end connector of rolling mill |
| CN104607827A (en) * | 2014-11-28 | 2015-05-13 | 沈阳大学 | Method for preventing cracks in cast steel and steel welding process |
-
2018
- 2018-10-30 CN CN201811274455.7A patent/CN109483149A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1911583A (en) * | 2006-08-23 | 2007-02-14 | 四川东风电机厂有限公司 | Repairing welding method for crack of rotor support power generator |
| CN101890610A (en) * | 2010-08-09 | 2010-11-24 | 中信重工机械股份有限公司 | Field repairing method of welding cracks of feeding slip-ring body of large-sized slide mill |
| CN102632321A (en) * | 2012-04-23 | 2012-08-15 | 湖南华菱湘潭钢铁有限公司 | Process for welding and repairing cracks of roller end connector of rolling mill |
| CN104607827A (en) * | 2014-11-28 | 2015-05-13 | 沈阳大学 | Method for preventing cracks in cast steel and steel welding process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110814632A (en) * | 2019-09-29 | 2020-02-21 | 广州黄船海洋工程有限公司 | Surfacing process method for cast steel anchor lip line type repair |
| CN110814632B (en) * | 2019-09-29 | 2021-10-26 | 广州黄船海洋工程有限公司 | Surfacing process method for cast steel anchor lip line type repair |
| CN112355567A (en) * | 2020-11-11 | 2021-02-12 | 广西柳州钢铁集团有限公司 | Method for repairing cracks of bogie of metallurgical railway diesel locomotive |
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