CN110039255A - Cast iron pump body repairs welding method - Google Patents
Cast iron pump body repairs welding method Download PDFInfo
- Publication number
- CN110039255A CN110039255A CN201910334773.6A CN201910334773A CN110039255A CN 110039255 A CN110039255 A CN 110039255A CN 201910334773 A CN201910334773 A CN 201910334773A CN 110039255 A CN110039255 A CN 110039255A
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- China
- Prior art keywords
- welding
- cast iron
- pump housing
- welding method
- pump body
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention provides a kind of cast iron pump body repairing welding method comprising following steps: S1: according to pump housing face crack quantity and size, removing crackle on the pump housing and concentrates position, prefabricated welding groove；S2: the size at position, prefabricated repairing insert are removed according to the pump housing；S3: the cleaning pump housing needs to repair the surface at position；S4: the prefabricated insert is installed on to the position for having removed cracking pump housing surface, carries out repairing welding.The generation that secondary cracks caused by stress is concentrated are generated due to being heated repeatedly is avoided that using insert repair welding method for more than the crackle and face to be reprocessed concentrated.And while saving material, the time is saved, while cost can also be reduced.
Description
Technical field
The present invention relates to welding field, in particular to a kind of cast iron pump body repairs welding method.
Background technique
Cargo ship in building course, usually due to install pump housing flange gathering pipe when, in piping flange and the pump housing
It is installed by force in the case where there is dislocation deviation between flange, causes there is a situation where that discontinuity, torsion are larger at the pump housing,
It is excessive due to being shaken when the pump housing works, it is be easy to cause cabin pump flange cracking, and crack number is more and more concentrates.
It is longer and expensive due to ordering the new pump time cycle again.If can repair, time while again is being saved
It can be with save the cost.Due to more than crackle and more concentrating, if taking weld line one by one, due to being heated repeatedly at repair welding, hold
Stress is also easy to produce to concentrate and crack again.
Summary of the invention
The technical problem to be solved by the present invention is to the drawbacks described above in order to overcome the prior art, a kind of cast iron pump body is provided and is repaired
Mend welding method.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of cast iron pump body repairing welding method, it is characterized in that, the cast iron pump body repairing welding method includes following
Step:
S1: it according to pump housing face crack quantity and size, removes crackle on the pump housing and concentrates position, prefabricated welding slope
Mouthful；
S2: the size at position, prefabricated repairing insert are removed according to the pump housing；
S3: the cleaning pump housing needs to repair the surface at position；
S4: the prefabricated insert is installed on to the position for having removed cracking pump housing surface, carries out repairing welding.
Preferably, in the step S1, removing the crackle on the pump housing using sander and concentrating position, and in the pump housing
One rectangular v notch v of upper formation, polishes to form the welding groove using abrasive machine along the rectangle gap edge, the weldering
The angle for connecing groove is 60 ± 5 degree.
Preferably, in the step S2, the material of the insert is low-alloy structural steel, the insert with a thickness of 8-
10mm, the shape and size of the insert are matched with the shape and size of the rectangular v notch v.
Preferably, in the step S3, the paint, iron rust and moisture for needing to repair surface are removed with sander and cutting torch
Equal impurity.If desired there are remaining iron rust, greasy dirt, moisture etc. in the surface repaired, stomata will be caused in weld seam, therefore weld
Before must be clean by these dirt removals.
Preferably, repairing welding uses multi-layer multi-pass welding method, and weld seam is divided into prime coat, fills out in the step S4
Fill layer and capping layer.Since pump housing wall thickness is thicker, through welding is easy using multi-pass welding, and multi-pass welding heat input is more single
Layer weldering is small, and temperature is high when reducing the welding of repairing position and the stress concentration that generates.
Preferably, the prime coat is welded using straight polarity direct current, prime coat selection of electrodes in the step S5
Z408, the diameter of the prime coat welding rod are 3.2mm, and the drying temperature of the prime coat welding rod is 100 ± 5 DEG C, soaking time
It is 1-2 hours.Z408 welding rod has the characteristics that intensity is high, plasticity is good, linear expansion coefficient, and is used for room temperature or slightly preheated
The welding of cast iron.For the cast iron pump body of cargo ship, Z408 welding rod is selected not have to preheating.
Preferably, in the step S4, the filled layer is welded using DC reverse connection, using backstep sequence into
Row welding, section length are 50 ± 5mm, and weld seam is hammered after being often soldered together, and hammering frequency is not less than 70 times/min；Filled layer
Selection of electrodes J507, the diameter of the filled layer welding rod are 3.2mm, and the drying temperature of the filled layer welding rod is 350 ± 5 DEG C,
Soaking time is 1-2 hours.Cast iron phosphorus content is high, impurity is more, and plasticity is low, weldability is poor, soldering sensitive to cooling velocity
After be easy to produce crackle.Segmented welding is that local temperature is excessively high during welding in order to prevent, stress is caused to be concentrated.And
Hammering weld seam is carried out after being often soldered together also for welding stress is reduced, and postwelding is avoided to crack.
Preferably, in the welding process, being welded using straight line manipulation of electrode, welding current is in the step S4
The interlayer temperature of 70-110A, weld seam are not higher than 70 DEG C, just can be carried out next layer of welding.Interlayer temperature is not higher than 70 DEG C
In order to reduce welding stress, prevent postwelding from cracking.
The positive effect of the present invention is that: for more than the crackle and face to be reprocessed concentrated, using insert repair welding method, energy
Avoid the generation that secondary cracks caused by stress is concentrated are generated due to being heated repeatedly.And while saving material, save
Time, while cost can also be reduced.
Detailed description of the invention
Fig. 1 is that the cast iron pump body of present pre-ferred embodiments repairs the flow diagram of welding method.
Specific embodiment
Preferred embodiment is enumerated below and further illustrates the present invention, but does not therefore limit the present invention to the implementation
Among example range.
Since cast iron pump body crack quantity caused by installing by force is general more and concentrates, insert repair welding method is used
Repairing welding is carried out, repairing welding method flow is as shown in Figure 1, steps are as follows:
S1: it according to pump housing face crack quantity and size, removes crackle on the pump housing and concentrates position, prefabricated welding slope
Mouthful；
S2: the size at position, prefabricated repairing insert are removed according to the pump housing；
S3: the cleaning pump housing needs to repair the surface at position；
S4: the prefabricated insert is installed on to the position for having removed cracking pump housing surface, carries out repairing welding.
Position is concentrated using the crackle on the sander removal pump housing, rectangular v notch v is formd after removal on the pump housing, uses
Abrasive machine polishes to form welding groove along rectangle gap edge, and the angle of welding groove is 60 ± 5 degree.
Repair welding insert is made in conjunction with the size of the rectangular v notch v formed on the pump housing, the material of insert is low-alloy structural
Steel, insert with a thickness of 8-10mm, the shape and size of insert are matched with the shape and size of rectangular v notch v, and can just be blocked
It connects in rectangular v notch v.And clean out the dirt on insert surface, expose metallic luster.
Then the impurity such as the paint, iron rust and moisture for needing to repair surface are removed with sander and cutting torch.If desired it repairs
Surface have remaining iron rust, greasy dirt, moisture etc., stomata will be caused in weld seam, therefore must be by these dirts before welding
It removes clean.
Repairing welding uses multi-layer multi-pass welding method, and weld seam is divided into prime coat, filled layer and capping layer.Due to pump housing wall
It is thicker, through welding is easy using multi-pass welding, and the heat input of multi-pass welding is small compared with single layer welding, reduces repairing position
Temperature is high when welding and the stress concentration that generates.
Prime coat is welded using straight polarity direct current, prime coat selection of electrodes Z408, and the diameter of prime coat welding rod is
3.2mm, the drying temperature of prime coat welding rod are 100 ± 5 DEG C, and soaking time is 1-2 hours.Z408 welding rod has intensity height, modeling
Property good, linear expansion coefficient the features such as, and the welding for room temperature or slightly preheated cast iron.For the cast iron pump body of cargo ship, choosing
Preheating is not had to Z408 welding rod.
Filled layer is welded using DC reverse connection, is welded using backstep sequence, and section length is 50 ± 5mm,
Weld seam is hammered after being often soldered together, hammering frequency is not less than 70 times/min；Filled layer selection of electrodes J507, filled layer welding rod
Diameter is 3.2mm, and the drying temperature of filled layer welding rod is 350 ± 5 DEG C, and soaking time is 1-2 hours.Cast iron phosphorus content is high, miscellaneous
Matter is more, and plasticity is low, weldability is poor, sensitive to cooling velocity, and crackle is easy to produce after soldering.Segmented welding is in order to anti-
Only local temperature is excessively high during welding, and stress is caused to be concentrated.And be often soldered together after carry out hammering weld seam also for
Welding stress is reduced, postwelding is avoided to crack.
In the welding process, it is welded using straight line manipulation of electrode, welding current 70-110A, the interlayer temperature of weld seam
Not higher than 70 DEG C, next layer of welding just can be carried out.Interlayer temperature, also for welding stress is reduced, prevents from welding not higher than 70 DEG C
After crack.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (8)
1. a kind of cast iron pump body repairs welding method, which is characterized in that the cast iron pump body repairing welding method includes following step
It is rapid:
S1: it according to pump housing face crack quantity and size, removes crackle on the pump housing and concentrates position, prefabricated welding groove；
S2: the size at position, prefabricated repairing insert are removed according to the pump housing；
S3: the cleaning pump housing needs to repair the surface at position；
S4: the prefabricated insert is installed on to the position for having removed cracking pump housing surface, carries out repairing welding.
2. cast iron pump body as described in claim 1 repairs welding method, which is characterized in that in the step S1, using beating
Grinding machine removes the crackle on the pump housing and concentrates position, and a rectangular v notch v is formed on the pump housing, using abrasive machine described in
Rectangle gap edge polishes to form the welding groove, and the angle of the welding groove is 60 ± 5 degree.
3. cast iron pump body as claimed in claim 2 repairs welding method, which is characterized in that in the step S2, the edge
The material of block is low-alloy structural steel, the insert with a thickness of 8-10mm, the shape and size of the insert with it is described rectangular
The shape and size of v notch v match.
4. cast iron pump body as described in claim 1 repairs welding method, which is characterized in that in the step S3, with polishing
Machine and cutting torch removing need to repair the impurity such as the paint, iron rust and moisture on surface.
5. cast iron pump body as described in claim 1 repairs welding method, which is characterized in that in the step S4, repairing welding
It connects using multi-layer multi-pass welding method, weld seam is divided into prime coat, filled layer and capping layer.
6. cast iron pump body as claimed in claim 5 repairs welding method, which is characterized in that described to beat in the step S5
Bottom is welded using straight polarity direct current, prime coat selection of electrodes Z408, and the diameter of the prime coat welding rod is 3.2mm, described
The drying temperature of prime coat welding rod is 100 ± 5 DEG C, and soaking time is 1-2 hours.
7. cast iron pump body as claimed in claim 5 repairs welding method, which is characterized in that described to fill out in the step S4
It fills layer to be welded using DC reverse connection, be welded using backstep sequence, section length is 50 ± 5mm, is often soldered together
After to hammer weld seam, hammering frequency is not less than 70 times/min；Filled layer selection of electrodes J507, the diameter of the filled layer welding rod are
3.2mm, the drying temperature of the filled layer welding rod are 350 ± 5 DEG C, and soaking time is 1-2 hours.
8. cast iron pump body as claimed in claim 5 repairs welding method, which is characterized in that in the step S4, welding
In the process, it is welded using straight line manipulation of electrode, welding current 70-110A, the interlayer temperature of weld seam is not higher than 70 DEG C, ability
Carry out next layer of welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334773.6A CN110039255A (en) | 2019-04-24 | 2019-04-24 | Cast iron pump body repairs welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910334773.6A CN110039255A (en) | 2019-04-24 | 2019-04-24 | Cast iron pump body repairs welding method |
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| CN110039255A true CN110039255A (en) | 2019-07-23 |
Family
ID=67279205
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| CN201910334773.6A Pending CN110039255A (en) | 2019-04-24 | 2019-04-24 | Cast iron pump body repairs welding method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110899903A (en) * | 2019-12-11 | 2020-03-24 | 首钢水城钢铁(集团)赛德建设有限公司 | Method for welding converter trunnion tangential key and top frame |
| CN112296491A (en) * | 2020-11-11 | 2021-02-02 | 中车洛阳机车有限公司 | Welding repair method for centrifugal filter shell |
| CN114102048A (en) * | 2021-10-23 | 2022-03-01 | 国营芜湖机械厂 | Method for repairing cracks of outer cylinder of actuator cylinder |
| CN114434031A (en) * | 2021-12-28 | 2022-05-06 | 青海中控太阳能发电有限公司 | Welding repair method for heat absorption pipe of fused salt heat absorber |
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| EP1985538A2 (en) * | 2007-04-24 | 2008-10-29 | United Technologies Corporation | Using a stiffener to repair a part for an aircraft engine. |
| CN101402152A (en) * | 2008-08-05 | 2009-04-08 | 烟台国冶冶金水冷设备有限公司 | Steel-smelting revolving furnace smoke canal weld deposit process |
| CN102922086A (en) * | 2012-11-21 | 2013-02-13 | 中国能源建设集团天津电力建设公司 | Manual arc welding bottoming layer Z-shaped arc extinction method and application thereof in Q460 high-strength steel butt-joint flat plate welding |
| CN105414708A (en) * | 2015-12-15 | 2016-03-23 | 含山县大力精密机械有限公司 | Welding repair method for gray cast iron |
| CN106583881A (en) * | 2016-12-13 | 2017-04-26 | 西安铂力特激光成形技术有限公司 | Cast iron arc welding repair method |
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2019
- 2019-04-24 CN CN201910334773.6A patent/CN110039255A/en active Pending
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|---|---|---|---|---|
| EP1985538A2 (en) * | 2007-04-24 | 2008-10-29 | United Technologies Corporation | Using a stiffener to repair a part for an aircraft engine. |
| CN101402152A (en) * | 2008-08-05 | 2009-04-08 | 烟台国冶冶金水冷设备有限公司 | Steel-smelting revolving furnace smoke canal weld deposit process |
| CN102922086A (en) * | 2012-11-21 | 2013-02-13 | 中国能源建设集团天津电力建设公司 | Manual arc welding bottoming layer Z-shaped arc extinction method and application thereof in Q460 high-strength steel butt-joint flat plate welding |
| CN105414708A (en) * | 2015-12-15 | 2016-03-23 | 含山县大力精密机械有限公司 | Welding repair method for gray cast iron |
| CN106583881A (en) * | 2016-12-13 | 2017-04-26 | 西安铂力特激光成形技术有限公司 | Cast iron arc welding repair method |
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| 李淑华: "《焊工现场操作技能》", 30 April 2007, 国防工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110899903A (en) * | 2019-12-11 | 2020-03-24 | 首钢水城钢铁(集团)赛德建设有限公司 | Method for welding converter trunnion tangential key and top frame |
| CN112296491A (en) * | 2020-11-11 | 2021-02-02 | 中车洛阳机车有限公司 | Welding repair method for centrifugal filter shell |
| CN114102048A (en) * | 2021-10-23 | 2022-03-01 | 国营芜湖机械厂 | Method for repairing cracks of outer cylinder of actuator cylinder |
| CN114434031A (en) * | 2021-12-28 | 2022-05-06 | 青海中控太阳能发电有限公司 | Welding repair method for heat absorption pipe of fused salt heat absorber |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190723 |
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| RJ01 | Rejection of invention patent application after publication |