CN105252202A - Repair welding reworking method for crack defects of flange disc casting with rib plate - Google Patents
Repair welding reworking method for crack defects of flange disc casting with rib plate Download PDFInfo
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- CN105252202A CN105252202A CN201510614630.2A CN201510614630A CN105252202A CN 105252202 A CN105252202 A CN 105252202A CN 201510614630 A CN201510614630 A CN 201510614630A CN 105252202 A CN105252202 A CN 105252202A
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- ring flange
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- gouge
- defect
- repair welding
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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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Abstract
The invention relates to a repair welding reworking method for crack defects of a flange disc casting with a rib plate in the field of defect repairing of steel castings. The repair welding reworking method sequentially comprises the following steps that (A) a plurality of reinforcing tie pieces are firmly welded to the back surface of a flange disc, and intersect with the cracking direction of the flange disc; (B) the casting to which the reinforcing tie pieces are welded is moved into a heat treatment furnace as a whole to be subjected to heat treatment; (C) residua portions such as a pouring gate and a dead head of the casting are cut off; (D) the surface of the flange disc is gouged along the crack defect portion for the first time and gouged to the position, near the rib plate, of the back surface of the flange disc in the cracking depth direction, and a gouge notch is kept smooth and free of impurities; (E) the primarily gouged portion is subjected to preheating and defect repair welding; (F) the casting is put into the heat treatment furnace again to be subjected to heat treatment after welding; (G) the back surface of the primarily gouged portion of the flange disc is gouged for the second time, the crack defects on the back surface of the flange disc and the rib plate are removed through gouging, and meanwhile the reinforcing tie pieces are removed; and (H) the secondarily gouged portion is subjected to preheating, defect repair welding and post-welding heat treatment.
Description
Technical field
The present invention relates to cast steel part defect recovery technique field, particularly a kind of repair welding repair method of ring flange class casting crack defect of sheet with rib.
Background technology
Shape and structure complexity in steel-casting is various, and wherein flange circle plate casting is exactly one of them, for the ring flange class casting that large-scale wall unevenness is even, for improving the intensity of foundry goods, often arranging some roads strengthen gusset at the ring flange back side.This kind of steel-casting, because size is comparatively large, the inhomogeneities of wall thickness, often produces various casting flaw.Wherein, gusset is weaker with the contact site of ring flange, there will be the crack defect running through whole gusset and flange thickness direction after product is poured in shake out process, as depicted in figs. 1 and 2 crackle 1 and crack site 2.This crack like defect can cause foundry goods gusset to rupture, and the booster action of gusset was lost efficacy.If process bad, easily cause product gross distortion, cause the phenomenons such as number of rewelding is too much, wlding waste, serious even generation foundry goods is scrapped.
The conventional bonding technique of this type of casting defect welds after all excavating crack defect again, and in actual production, this faults repair method easily causes the gross distortion of casting flange, and even foundry goods is scrapped, and this solder yield is less than 50%.Meanwhile, carry out welding after all excavating crack defect again and cause high, the workload of welding difficulty to increase, be unfavorable for saving production cost and shortening the production cycle.
Summary of the invention
The present invention is directed to ring flange class casting crack defect repair welding process method Problems existing in prior art, a kind of repair welding repair method of ring flange class casting crack defect of sheet with rib is provided, to reduce the distortion of defect repair welding, improve the qualification rate of Welding Repair.
The object of the present invention is achieved like this, and a kind of repair welding repair method of ring flange class casting crack defect of sheet with rib, comprises following process successively:
A) lacing wire is strengthened in welding: the firmly some reinforcement lacing wires of welding respectively at the ring flange back side, and reinforcement lacing wire is intersected with ring flange rift direction; B) the foundry goods entirety of welding reinforcement lacing wire is moved into heat-treatment furnace to heat-treat; C) foundry goods running channel, rising head class long position is excised; D) carry out gouge first from ring flange surface along crack defect position, to the depth direction gouge of fracture to the ring flange back side close gusset place, and keep gouge smooth cut, without being mingled with; E) preheating and defect repair welding are carried out to gouge position first; F) foundry goods is entered again heat-treatment furnace and carry out post weld heat treatment; G) along the back side secondary gouge at ring flange gouge position first, exclude the crack defect on the ring flange back side and gusset, remove simultaneously and strengthen lacing wire; H) preheating, defect repair welding and post weld heat treatment are carried out to the position of secondary gouge.
In crack defect repair welding repair method of the present invention, two secondary clearing gouges are adopted for penetrating crack defect, layering repair welding, and before to the crack defect of the large plane of ring flange first gouge, for being out of shape during repair welding after preventing gouge, strengthen lacing wire in the direction welding back to gouge first, the intensity of foundry goods can be improved, ring flange casting deformation when preventing gouge and repair welding, improves repair welding of casting and reprocesses quality, and reduce the workload of follow-up shaping; Foundry goods is after gouge repair welding first, and the reinforcement lacing wire at the gouge excision back side and remaining defect are carried out repair welding again and reprocessed.Therefore, by the penetrating crack defect of method of the present invention for flange circle plate casting, can realize the gouge repair welding reclamation work without distortion, that improves foundry goods reprocesses quality, reduces follow-up re-shaping exercise amount, improves and reprocesses efficiency, reduces and reprocesses cost.
The fastness of lacing wire is strengthened, the A of the inventive method for improving further) in step, described reinforcement lacing wire is welded on the both sides of the gusset at the ring flange back side and the junction of ring flange respectively.
For improving the weld strength strengthening lacing wire further, the A of the inventive method) in step, polishing impurity elimination process is carried out before strengthening surface, the welding position weldering of lacing wire in the described ring flange back side, and then to adopting the process of natural gas flame preheat around welding position, weld when preheat temperature reaches 150 DEG C-350 DEG C.
For making reinforcement lacing wire and foundry goods have corresponding mechanical performance, the A of the inventive method) in step, described reinforcement lacing wire is cut polishing with ring flange foundry goods with the dead meal block that stove is poured into a mould to form.
For ensureing thoroughly to remove defect, described step D) in the width of gouge recess first after gouge be 1-1.3 times of the degree of depth.
For ensureing defect repair welding quality further, described E) and the preheated zone of H) step defect repair welding be region within the scope of gouge position and peripheral 100-120mm, the temperature of preheating is 150 DEG C-350 DEG C, and until is preheating to defect repair welding and terminates into before heat-treatment furnace.
Accompanying drawing explanation
Fig. 1 is the penetrating crack defect schematic diagram of flange circle plate casting.
Fig. 2 is the schematic diagram that Fig. 1 turn to the ring flange back side.
Fig. 3 is the welding schematic diagram strengthening lacing wire.
Fig. 4 is the schematic diagram of foundry goods first after gouge.
Polishing impurity elimination process is carried out before strengthening surface, the welding position weldering of lacing wire in the described ring flange back side, and then to adopting the process of natural gas flame preheat around welding position, keeps welding when 150 DEG C-350 DEG C in preheat temperature.
Detailed description of the invention
As shown in Figure 3 and Figure 4, the repair welding repair method of the flange circle plate casting fracture of sheet with rib of the present invention, comprises following process successively:
A) lacing wire is strengthened in welding: as shown in Figure 3, according to the position of the penetrating crack defect on ring flange foundry goods, firmly weld some reinforcement lacing wires 4 at ring flange back side gusset 3 respectively with the both sides of ring flange junction, make intensity strengthen lacing wire 4 and intersect with the direction of crackle on ring flange 2; For ensureing the fastness of welding, before welding, polishing impurity elimination process is carried out before strengthening surface, the welding position weldering of lacing wire 4 in the ring flange back side, and adopts natural gas flame to carry out the pre-heat treatment around welding position, welds when preheat temperature reaches 150 DEG C-350 DEG C; B) the foundry goods entirety of welding reinforcement lacing wire 4 is moved into heat-treatment furnace to heat-treat, make the even tissue refinement of foundry goods and welding position, the casting stress eliminating cast-internal and welding stress, to reduce the stress deformation of subsequent treatment operation; C) long position such as running channel, rising head of cast(ing) surface is excised; D) gouge is first carried out from ring flange surface along the direction of crackle, to crack depth direction gouge to the ring flange back side close gusset place, for ensureing thoroughly to remove defect, the width of gouge recess 5 is 1-1.3 times of the degree of depth, and keep gouge smooth cut, without being mingled with, as shown in Figure 4, first after gouge, the crack defect at ring flange position is excluded substantially, and form gouge recess 5, this gouge recess 5 forms the weak part of flange plate structure, and this weak part of just in time reinforcement of the reinforcement lacing wire 4 be crisscross arranged, prevent follow-up welding deformation; E) preheating and defect repair welding are carried out to gouge position first; For improving welding quality, preheated zone is the region within the scope of gouge position and peripheral 100-120mm, when preheat temperature reaches 150 DEG C-350 DEG C, starts to carry out defect repair welding, and the pre-heat treatment is until defect repair welding terminates into before heat-treatment furnace; F) foundry goods is entered again heat-treatment furnace and carry out post weld heat treatment, to remove welding stress, and the tissue around uniform welding; G) along the back side secondary gouge at ring flange gouge position first, exclude the crack defect on the ring flange back side and gusset 3, remove simultaneously and strengthen lacing wire 4; H) preheating, defect repair welding and post weld heat treatment are carried out to the position of secondary gouge, be similarly and ensure pre-thermal mass, preheated zone is the region within the scope of gouge position and peripheral 100-120mm, when preheat temperature reaches 150 DEG C-350 DEG C, start to carry out defect repair welding, and preheating is until defect repair welding terminates into before heat-treatment furnace.
In crack defect repair welding repair method of the present invention, two secondary clearing gouges are adopted for penetrating crack defect, layering repair welding, and before to the penetrating crack of the large plane of ring flange first gouge, for preventing gouge and repair welding distortion, strengthen lacing wire in the direction welding back to gouge first, the intensity of foundry goods can be improved, ring flange casting deformation when preventing gouge and repair welding, improves repair welding of casting and reprocesses quality, and reduce the workload of follow-up shaping; Foundry goods is after gouge repair welding first, and the reinforcement lacing wire 4 at the gouge excision back side and remaining defect are carried out repair welding again and reprocessed.Therefore, by the penetrating crack defect of method of the present invention for flange circle plate casting, can realize the gouge repair welding reclamation work without distortion, that improves foundry goods reprocesses quality, reduces follow-up re-shaping exercise amount, improves and reprocesses efficiency, reduces and reprocesses cost.
Claims (6)
1. a repair welding repair method for the ring flange class casting crack defect of sheet with rib, is characterized in that, comprise following process successively:
A) lacing wire is strengthened in welding: the firmly some reinforcement lacing wires of welding respectively at the ring flange back side, and reinforcement lacing wire is intersected with ring flange rift direction; B) the foundry goods entirety of welding reinforcement lacing wire is moved into heat-treatment furnace to heat-treat; C) foundry goods running channel, rising head class long position is excised; D) carry out gouge first from ring flange surface along crack defect position, to the depth direction gouge of fracture to the ring flange back side close gusset place, and keep gouge smooth cut, without being mingled with; E) preheating and defect repair welding are carried out to gouge position first; F) foundry goods is entered again heat-treatment furnace and carry out post weld heat treatment; G) along the back side secondary gouge at ring flange gouge position first, exclude the crack defect on the ring flange back side and gusset, remove simultaneously and strengthen lacing wire, H) preheating, defect repair welding and post weld heat treatment are carried out to the position of secondary gouge.
2. the repair welding repair method of the ring flange class casting crack defect of sheet with rib according to claim 1, is characterized in that, A) in step, described reinforcement lacing wire is welded on the both sides of the gusset at the ring flange back side and the junction of ring flange respectively.
3. the repair welding repair method of the ring flange class casting crack defect of sheet with rib according to claim 2, it is characterized in that, polishing impurity elimination process is carried out before strengthening surface, the welding position weldering of lacing wire in the described ring flange back side, and then to adopting the process of natural gas flame preheat around welding position, weld when preheat temperature reaches 150 DEG C-350 DEG C.
4. the repair welding repair method of the ring flange class casting crack defect of sheet with rib according to claim 1, is characterized in that, A) in step, described reinforcement lacing wire is cut polishing with ring flange foundry goods with the dead meal block that stove is poured into a mould to form.
5., according to the repair welding repair method of the ring flange class casting crack defect of sheet with rib according to claim 1, it is characterized in that, described step D) in the width of gouge recess first after gouge be 1-1.3 times of the degree of depth.
6. the repair welding repair method of the ring flange class casting crack defect of sheet with rib according to claim 1, it is characterized in that, described E) and the preheated zone of H) step defect repair welding be gouge position and peripheral 100 100-120mm within the scope of region, the temperature of preheating is 150 DEG C-350 DEG C, and until is preheating to defect repair welding and terminates into before heat-treatment furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510614630.2A CN105252202B (en) | 2015-09-24 | 2015-09-24 | A kind of repair welding repair method of the ring flange class casting crack defect of sheet with rib |
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| CN201510614630.2A CN105252202B (en) | 2015-09-24 | 2015-09-24 | A kind of repair welding repair method of the ring flange class casting crack defect of sheet with rib |
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| CN105252202A true CN105252202A (en) | 2016-01-20 |
| CN105252202B CN105252202B (en) | 2017-10-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111266700A (en) * | 2020-03-30 | 2020-06-12 | 安徽马钢设备检修有限公司 | Welding device and repairing process for heat-resistant steel base of slow cooling wheel |
| CN115319326A (en) * | 2022-09-13 | 2022-11-11 | 上海外高桥造船有限公司 | Crack repair method |
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| CN115319326A (en) * | 2022-09-13 | 2022-11-11 | 上海外高桥造船有限公司 | Crack repair method |
| CN115319326B (en) * | 2022-09-13 | 2024-04-16 | 上海外高桥造船有限公司 | Crack repairing method |
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| CN105252202B (en) | 2017-10-31 |
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