CN101850489B - Process method for welding and repairing sintering trolley - Google Patents
Process method for welding and repairing sintering trolley Download PDFInfo
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- CN101850489B CN101850489B CN2010101482554A CN201010148255A CN101850489B CN 101850489 B CN101850489 B CN 101850489B CN 2010101482554 A CN2010101482554 A CN 2010101482554A CN 201010148255 A CN201010148255 A CN 201010148255A CN 101850489 B CN101850489 B CN 101850489B
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Abstract
The invention relates to an electric-arc welding, further to a process method for welding and repairing a sintering trolley. The repairing process comprises the following steps: opening a U-shaped groove with slotting welding rods; cleaning the groove with an angle grinder; sequentially welding with cast-iron welding rods in a multilayer manner, and then heating in a furnace; heating the sintering trolley to 900 DEG C, preserving heat for 1 hour and then getting out of the furnace; mechanically reshaping; and finally carrying out heat treatment. Compared with the prior art, the process method has the advantages that no chilling tissues generate, thus lowering the risk of basic cracking while welding and effectively guaranteeing the success of the welding; the welding stress is completely released by using intermittent welding and a string bead during the welding process; and each sintering trolley only needs welding and repairing cost of 2000-5000yuan which is equivalent to about 2% of the price of the sintering trolley, thus saving a large amount of fund.
Description
Technical field
The present invention relates to a kind of arc welding, further relate to a kind of process of pallet REPAIR WELDING.
Background technology
Pallet is the important spare part of sintering machine, work under bad environment, and its chassis intermediate is a spheroidal graphite cast-iron.Because work under bad environment, pallet chassis intermediate in use for some time will produce cracking, and then causes distortion, causes chassis to be scrapped.Sintering machine of steel mill need be equipped with four or five ten to up to a hundred pallet cycle operations.These pallets are different according to size, are worth tens0000 not wait to hundreds of thousands.
At first, the pallet intermediate is a spheroidal graphite cast-iron, and the welding difficulty height of cast iron is the problem that the welding circle generally acknowledges.Mainly be that the cast iron phosphorus content is high, bad plasticity, tissue odds is even, and weldability is very poor, when welding, the following problem of general easy appearance:
(1) carbon in the cast iron and silicone content are higher, are prone to produce pore, and silicon is prone to produce silica, hinders carrying out smoothly of welding process.
(2) graphite element such as carbon and silicon is prone to scaling loss and fast cold, and owing to the effect of nodulizer magnesium, its air chill tendency of weld seam interface increases, and is easy to generate extremely crisp white iron tissue in the spheroidal graphite cast-iron, and Weld Performance is poor.
(3) cast iron bad plasticity, stress is bigger during welding, is prone to produce the crack.
(4) the pallet wall thickness is big, has strengthened the difficulty of welding greatly.For example: 360m
2The main wall thickness of chassis intermediate is 40～50mm.
Secondly, the pallet work under bad environment, otherwise cracked ends receives the frequent variations of high temperature-low temperature, the mechanical property of spheroidal graphite cast-iron (intensity, plasticity, toughness) height, its mechanical property of material QT500-7 for example commonly used: σ
b>=500MPa, so the requirement of the mechanical performance of butt welded seam metal and physical property is all very high.
The 3rd, the size of pallet is big, Heavy Weight, and it is not too convenient to transport, the mode that can only take field Welding to repair.For example: 360m
2Chassis intermediate appearance profile is of a size of 4514mm * 1486mm * 440mm, about 5 tons of gross weight.
Summary of the invention
The process of pallet REPAIR WELDING, said pallet mother metal is a spheroidal graphite cast-iron; Comprise the steps:
At first, adopt the fluting welding rod to open 60 ° of double V-grooves; Angle grinding machine cleaning groove;
Adopt electrode for cast iron, the parameter of said electrode for cast iron is: tensile strength reaches 415 newton/more than the square millimeter, more than the hardness HB210;
Adopt electrode for cast iron welding in order at many levels, the parameter of said electrode for cast iron is: tensile strength reaches 415 newton/m
2More than, more than the hardness HB210; Adopt the bead weld discontinuous welding, the welding rod amplitude of fluctuation is no more than the twice of core diameter; The length of every section welding rod is no more than 7cm; The 1st road weld seam technological parameter: 85 amperes in electric current; After treating that the first road weld seam is cooled to 100 ℃, begin to carry out follow-up weld seam, follow-up weld seam technological parameter: 100 amperes in electric current;
Advance the stove heating: pallet is heated to 900 ℃, is incubated one hour, come out of the stove;
It is orthopedic to carry out machinery; Heat treatment.
Technology for Heating Processing has 2 kinds:
First kind: 920-980 ℃ kept 3 hours, and stove is as cold as 600 ℃, air cooling.
Second kind: 920-980 ℃ kept 3 hours, and stove is chilled to 700-760 ℃ of insulation 4 hours, and stove is chilled to 600 ℃ again, air cooling.
The present invention is with respect to the advantage of prior art:
(1) can in the process of fluting, make mother metal keep lower temperature (to end groove; Can touch with hand at once), can ensure effectively that like this groove face metal and mother metal are consistent; Cast iron particularly; Can not produce the air chill tissue, the risk of MATRIX CRACKING when reducing welding has effectively ensured the success of welding.
(2) discontinuous welding, string(er) bead is discharged welding stress fully in welding process.
(3) every of REPAIR WELDING cost only requirement be 2000-5000 unit, only be equivalent to about 2% of pallet price, can practice thrift a large amount of funds.
Description of drawings
Fig. 1 is the organigram of whole weld seam among the embodiment 1, and 1-10 represents the weld seam of welding successively respectively.
Fig. 2 is a pallet sketch map among the embodiment 1; 1-5 numbers corresponding different parts.
The specific embodiment
Embodiment 1:
Table 1:360m
2Quality testing data (part) in the pallet intermediate foundry goods
At first, adopt omnipotent 100 fluting welding rods to open 60 ° of double V-grooves;
Then, angle grinding machine cleaning groove, treatment effect: make groove face smoother, expose metallic luster;
Behind the cleaning groove, select for use omnipotent MG289 electrode for cast iron to weld.MG289 tensile strength can reach 60000psi (415 newton/square millimeter), hardness HB210, and the mass percentage content of its main component is following: C content 1.38%; Ni content 55.4%, Fe content 40.31%, Al content 0.85%; Mo content 0.04%, Cu content 0.04%, Si content 0.006%.
Advance the stove heating: pallet is heated to 900 ℃, is incubated 1 hour, come out of the stove;
It is orthopedic to carry out machinery;
Heat treatment: 920-980 ℃ kept 3 hours, and stove is as cold as 600 ℃, air cooling.
Pallet after the reparation has stood the high temperature check of more than 900 degree in the production run process more than 2 years, weldering meets connecting portion to have no cracking phenomena.
All the other method steps are identical with embodiment 1, and difference is heat treatment process: 920-980 ℃ kept 3 hours, and stove is chilled to 700-760 ℃ of insulation 4 hours, and stove is chilled to 600 ℃ again, air cooling.
Claims (4)
1. the process of pallet REPAIR WELDING, said pallet mother metal is a spheroidal graphite cast-iron; Comprise the steps:
At first, adopt the fluting welding rod to open 60 ° of double V-grooves;
Angle grinding machine cleaning groove;
Adopt electrode for cast iron welding in order at many levels, the parameter of said electrode for cast iron is: tensile strength is 415 newton/more than the square millimeter, more than the hardness HB210; Adopt the bead weld discontinuous welding, the welding rod amplitude of fluctuation is no more than the twice of core diameter; The length of every section welding rod is no more than 7cm; The 1st road weld seam technological parameter: 85 amperes in electric current; After treating that the first road weld seam is cooled to 100 ℃, begin to carry out follow-up weld seam, follow-up weld seam technological parameter: 100 amperes in electric current;
Advance the stove heating: pallet is heated to 900 ℃, is incubated 1 hour, come out of the stove;
It is orthopedic to carry out machinery;
Heat treatment: 920-980 ℃ kept 3 hours, and stove is as cold as 600 ℃, air cooling.
2. according to the process of the said pallet REPAIR WELDING of claim 1, it is characterized in that said electrode for cast iron comprises the composition of following mass percent: C content 1.38%; Ni content 55.4%; Fe content 40.31%, Al content 0.85%, Mo content 0.04%; Cu content 0.04%, Si content 0.006%.
3. the process of pallet REPAIR WELDING, said pallet mother metal is a spheroidal graphite cast-iron; Comprise the steps:
At first, adopt the fluting welding rod to open 60 ° of double V-grooves;
Angle grinding machine cleaning groove;
Adopt electrode for cast iron welding in order at many levels, the parameter of said electrode for cast iron is: tensile strength is 415 newton/more than the square millimeter, more than the hardness HB210; Adopt the bead weld discontinuous welding, the welding rod amplitude of fluctuation is no more than the twice of core diameter; The length of every section welding rod is no more than 7cm; The 1st road weld seam technological parameter: 85 amperes in electric current; After treating that the first road weld seam is cooled to 100 ℃, begin to carry out follow-up weld seam, follow-up weld seam technological parameter: 100 amperes in electric current;
Advance the stove heating: pallet is heated to 900 ℃, is incubated 1 hour, come out of the stove;
It is orthopedic to carry out machinery;
Heat treatment: 920-980 ℃ kept 3 hours, and stove is chilled to 700-760 ℃ of insulation 4 hours, and stove is chilled to 600 ℃ again, air cooling.
4. according to the process of the said pallet REPAIR WELDING of claim 3, it is characterized in that said electrode for cast iron comprises the composition of following mass percent: C content 1.38%; Ni content 55.4%; Fe content 40.31%, Al content 0.85%, Mo content 0.04%; Cu content 0.04%, Si content 0.006%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101482554A CN101850489B (en) | 2010-04-16 | 2010-04-16 | Process method for welding and repairing sintering trolley |
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| CN2010101482554A CN101850489B (en) | 2010-04-16 | 2010-04-16 | Process method for welding and repairing sintering trolley |
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| CN101850489A CN101850489A (en) | 2010-10-06 |
| CN101850489B true CN101850489B (en) | 2012-06-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103084702A (en) * | 2013-02-05 | 2013-05-08 | 广东韶钢松山股份有限公司 | Welding repair method for trolley breakage of sintering machine |
| CN103084563B (en) * | 2013-02-27 | 2016-01-20 | 南京信息工程大学 | A kind of method of repairing ordinary carbon steel machine part surface damage |
| CN107214439A (en) * | 2017-07-17 | 2017-09-29 | 广西百色银海铝业有限责任公司 | A kind of cast iron solder flux and welding method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4550235A (en) * | 1982-07-30 | 1985-10-29 | Fuewesi Peter | Apparatus for restoring the surfaces surrounding the bores of metallic workpieces |
| CN1030040A (en) * | 1988-04-05 | 1989-01-04 | 重庆大学 | New method of amending surface defects of castings |
| CN1270299A (en) * | 1999-04-12 | 2000-10-18 | 霍亚铭 | Sinter trolley and its making method |
| EP1844894A1 (en) * | 2006-04-12 | 2007-10-17 | Linde Aktiengesellschaft | Process of welding repair of cast materials having a defect; Workpiece made of cast material having such a repaired part; Use of a gas mixing for such process |
| CN101152689A (en) * | 2006-09-28 | 2008-04-02 | 上海宝冶工程技术公司 | Renovation technology for ladle |
-
2010
- 2010-04-16 CN CN2010101482554A patent/CN101850489B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4550235A (en) * | 1982-07-30 | 1985-10-29 | Fuewesi Peter | Apparatus for restoring the surfaces surrounding the bores of metallic workpieces |
| CN1030040A (en) * | 1988-04-05 | 1989-01-04 | 重庆大学 | New method of amending surface defects of castings |
| CN1270299A (en) * | 1999-04-12 | 2000-10-18 | 霍亚铭 | Sinter trolley and its making method |
| EP1844894A1 (en) * | 2006-04-12 | 2007-10-17 | Linde Aktiengesellschaft | Process of welding repair of cast materials having a defect; Workpiece made of cast material having such a repaired part; Use of a gas mixing for such process |
| CN101152689A (en) * | 2006-09-28 | 2008-04-02 | 上海宝冶工程技术公司 | Renovation technology for ladle |
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| CN101850489A (en) | 2010-10-06 |
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