CN105945437B - A kind of faults repair method after low-alloy cast steel part finishing - Google Patents
A kind of faults repair method after low-alloy cast steel part finishing Download PDFInfo
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- CN105945437B CN105945437B CN201610372472.9A CN201610372472A CN105945437B CN 105945437 B CN105945437 B CN 105945437B CN 201610372472 A CN201610372472 A CN 201610372472A CN 105945437 B CN105945437 B CN 105945437B
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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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
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Abstract
The present invention relates to the defects of large-scale steel-casting to reprocess in technical field faults repair method after a kind of finishing of low-alloy cast steel part, excavate detection, weld preheating, defect repair welding and postweld heat preservation process including defect, the defects of passing through present invention repair method, by the way that defect is rationally controlled to excavate technique, the pre-heating technique at repair welding position and surrounding, repair welding and local post weld heat treatment technique, postwelding is not needed to integrally carry out casting into furnace treatment reason, so as to avoid the deformation at the non-repair welding position of casting.And it is obviously shortened welding to reprocess the period, energy saving, qualification rate is reprocessed in raising.
Description
Technical field
The present invention relates to the defects of large-scale steel-casting to reprocess technical field, more particularly to a kind of low-alloy cast steel part finishing
Faults repair method afterwards.Especially suitable for complicated and to stringent low of the requirements such as size, metallographic, hardness, mechanical performance
The local defect of alloy cast steel part is reprocessed.
Background technology
Since molten steel is more acute to the heat effect of sand mold, mechanism and chemical action in the production process of steel-casting
It is strong, thus quality problems most prominent during Steel Castings are exactly scab, stomata, sand washing, slag inclusion.To eliminate in casting
Drawbacks described above, most common method carries out REPAIR WELDING after exactly excessive defect is excavated, right again after defect whole reparation is qualified
Casting carries out post weld heat treatment.It is limited to the limitations such as detection device accuracy and testing staff's level of skill, part tiny defect
It may just be found after steel-casting finishing, it is necessary to carry out welding after defect is excavated again and reprocess, after faults repair qualification again
Carry out post weld heat treatment.Since steel-casting at this time has reached finishing state, if carried out at postwelding heat after faults repair
Reason can then cause the deformation of casting, undesirable so as to cause casting dimension.
Invention content
The present invention reprocesses work for remaining local defect after complicated large-scale steel-casting finishing in the prior art
The deficiency of skill provides a kind of faults repair method after low-alloy cast steel part finishing, to improve the qualification rate reprocessed.
The object of the present invention is achieved like this, a kind of faults repair method after low-alloy cast steel part finishing, including lacking
It falls into and excavates detection, weld preheating, defect repair welding and postweld heat preservation process, it is characterised in that：It, will be smart when the defect excavates detection
Position is excavated using electric cutting tool or pneumatic cutting element the defects of steel-casting after processing, and after excavating defect
Notch is polished into V-type, then carry out defects detection to the v-notch surface after polishing and periphery along casting depth direction；The weldering
Preceding warm is：To the v-notch of defects detection qualification, surface the pre-heat treatment is carried out using natural gas or oxyacetylene torch,
By controlling flame size and flame and the distance on v-notch surface, steel-casting v-notch surface and surrounding are preheating to
150-160 DEG C, and keep the temperature 20-30min；During the defect repair welding, the manual mash welder point since the bottom of v-notch
Layer repair welding, the thickness of every layer of weld seam are 1.8-2.2mm, during first layer repair welding, using the welding rod of 3.2mm, welding current 95-
100A during welding, makes solder fully be merged with bottom substrate, and when welding the second layer, using the welding rod of 3.2mm, welding current is
120-130A；When welding third layer and more than layer, using the welding rod of 4.0mm, welding current 150-160A is welded to casting
During the cap weld on surface, using the welding rod of 5.0mm, welding current 230-240A, the overlay area side of the cap weld
Edge is smaller 2-3mm than the layer edges of regions of its lower floor, and the cap weld number of plies is 2-3 layers；During the postweld heat preservation,
The region of the repair welding portion faces of postwelding and surrounding is warming up to 200-210 DEG C, and keep the temperature t minutes with fire weldering heating, is kept the temperature
Time is calculated by the depth capacity h of v-notch, and by t=2h, the wherein unit of h is millimeter.
By the drawbacks described above repair method of the present invention, by the way that defect is rationally controlled to excavate technique, repair welding position and surrounding
Pre-heating technique, repair welding and local post weld heat treatment technique, do not need to integrally to carry out casting postwelding and managed into furnace treatment, from
And avoid the deformation at the non-repair welding position of casting.And it is obviously shortened welding to reprocess the period, energy saving, qualification is reprocessed in raising
Rate.
To improve repair welding quality, during the defect repair welding, when carrying out each layer repair welding, adjacent two welderings of same layer
The imbricate width in road is 40%-the 50% of single weld width, and the width of every welding bead is 10-12mm.
To reduce the heat affecting of welding region, during the weld preheating, the preheating area around v-notch is V-type
The notch peripheral region of 5 times of notch maximum gauge.
Quickly to detect whether rejected region is excavated thoroughly, the defect is excavated the defects of detection process detection method and is adopted
With lossless bruise detection.
For ease of detecting the temperature at preheating position immediately, the temperature during the weld preheating and postweld heat preservation is using red
Outer temperature-measuring gun detection.
Description of the drawings
Fig. 1 is the adjacent welding bead edges cover schematic diagram of same layer during defect repair welding.
Fig. 2 welds schematic diagram for cap weld.
Specific embodiment
The present invention is described with reference to the accompanying drawings with specific embodiment below.
Faults repair method after the low-alloy cast steel part finishing of the present invention is excavated detection including defect, weld preheating, is lacked
Repair welding and postweld heat preservation process are fallen into, when defect excavates detection, by position uses electronic skiver the defects of steel-casting after finishing
Tool or pneumatic cutting element are excavated, and the high heat inputs such as gouging torch are forbidden to use during this excavates tool, to avoid digging
It will excavate the notch after defect except being influence of the overheat to peripheral region that generates, after excavating and be polished into V along casting depth direction
Type, then lossless bruise detection is carried out to the v-notch surface after polishing and periphery, to ensure that defect is excavated totally.Then it carries out
Weld preheating process is that the v-notch qualified to drawbacks described above detection carries out surface preheating using natural gas or oxyacetylene torch
Processing, by controlling flame size and flame and the distance on v-notch surface, by around steel-casting v-notch surface and notch 5
The peripheral region of times notch maximum gauge is preheating to 150-160 DEG C, and keeps the temperature 20-30min, in preheating and insulating process, leads to
Infrared temperature-measuring gun at-once monitor preheating temperature is crossed, to ensure that welding region and surrounding preheat uniformly.Then defect repair welding mistake is carried out
Journey, the manual mash welder layering repair welding since the bottom of v-notch, the thickness of every layer of weld seam are 1.8-2.2mm, first layer repair welding
When, using the welding rod of 3.2mm, welding current 95-100A during welding, makes solder fully be merged with bottom substrate, welding the
At two layers, using the welding rod of 3.2mm, welding current 120-130A；When welding third layer and more than layer, using 4.0mm
Welding rod, welding current 150-160A；For ease of controlling welding layer quality, as shown in Figure 1, adjacent two welderings of same layer
The imbricate width in road is 40%-the 50% of single weld width, and the width of every welding bead is 10-12mm；It is welded to casting table
During the cap weld in face, using the welding rod of 5.0mm, welding current 230-240A, as shown in Fig. 2, the area of coverage of cap weld
Domain edge is smaller 2-3mm than the layer edges of regions of its lower floor, and the number of plies of cap weld is generally 2-3 layers；Postweld heat preservation mistake
The region of the repair welding portion faces of postwelding and surrounding is warming up to 200-210 DEG C, and keep the temperature t points by Cheng Zhong with fire weldering heating
Clock, soaking time are calculated by the depth capacity h of v-notch, and by t=2h, the wherein unit of h is millimeter.
By the drawbacks described above repair method of the present invention, by the way that defect is rationally controlled to excavate technique, repair welding position and surrounding
Pre-heating technique, repair welding and local post weld heat treatment technique, do not need to integrally to carry out casting postwelding and managed into furnace treatment, from
And avoid the deformation at the non-repair welding position of casting.And it is obviously shortened welding to reprocess the period, energy saving, qualification is reprocessed in raising
Rate.
Claims (5)
1. a kind of faults repair method after low-alloy cast steel part finishing, excavates detection, weld preheating, defect repair welding including defect
With postweld heat preservation process, it is characterised in that：When the defect excavates detection, the remaining rejected region of steel-casting after finishing is made
Excavated with electric cutting tool or pneumatic cutting element, and be polished into the notch after defect is excavated along casting depth direction
V-type, then defects detection is carried out to the v-notch surface after polishing and periphery；The weld preheating process is：Defects detection is closed
The v-notch of lattice carries out surface the pre-heat treatment, by controlling flame size and flame and V using natural gas or oxyacetylene torch
Steel-casting v-notch surface and surrounding are preheating to 150-160 DEG C, and keep the temperature 20-30min by the distance on type notch surface；Institute
During stating defect repair welding, manual spot welding and layering repair welding since the bottom of v-notch, the thickness of every layer of weld seam is 1.8-
2.2mm, during first layer repair welding, using the welding wire of 3.2mm, welding current 95-100A during welding, makes solder and bottom substrate
Fully fusion, when welding the second layer, using the welding wire of 3.2mm, welding current 120-130A；Welding third layer and more than weld
During layer, using the welding wire of 4.0mm, welding current 150-160A when being welded to the cap weld higher than cast(ing) surface, is used
The welding rod of 5.0mm, welding current 230-240A, the overlay area edge of the cap weld is than the layer regional edge of its lower floor
The small 2-3mm of edge, the cap weld number of plies are 2-3 layers；During the postweld heat preservation, by the repair welding portion faces of postwelding and
The region of surrounding is warming up to 200-210 DEG C, and keep the temperature t minutes with fire weldering heating, and soaking time presses the maximum of v-notch deeply
It spends h to calculate, is t=2h, wherein the unit of h is millimeter.
2. faults repair method after low-alloy cast steel part finishing according to claim 1, which is characterized in that the defect
In process of patch weld, when carrying out each layer repair welding, the imbricate width of adjacent two welding beads of same layer is single weld width
40%-50%, the width of every welding bead is 10-12mm.
3. faults repair method after low-alloy cast steel part finishing according to claim 1, which is characterized in that before the weldering
In warm, the preheating area around v-notch is the notch peripheral region of 5 times of v-notch maximum gauge.
4. faults repair method after low-alloy cast steel part finishing according to claim 1, which is characterized in that the defect
The defects of detection process detection method is excavated using lossless bruise detection.
5. faults repair method after low-alloy cast steel part finishing according to claim 1, which is characterized in that before the weldering
Temperature during preheating and postweld heat preservation is detected using infrared temperature-measuring gun.
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| CN105945437B true CN105945437B (en) | 2018-06-22 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110303297A (en) * | 2019-07-02 | 2019-10-08 | 浙江开诚机械有限公司 | CrMoV steel-casting reprocesses repair method |
| CN111730245A (en) * | 2020-06-22 | 2020-10-02 | 共享智能铸造产业创新中心有限公司 | Welding system and casting defect repair welding method |
| CN113664458B (en) * | 2021-08-27 | 2023-03-24 | 北京星航机电装备有限公司 | Defect repairing method for deformed aluminum alloy projectile body launch canister weld joint |
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