CN108161333A - A kind of welding repair method of Dump Truck Frame - Google Patents
A kind of welding repair method of Dump Truck Frame Download PDFInfo
- Publication number
- CN108161333A CN108161333A CN201711475602.2A CN201711475602A CN108161333A CN 108161333 A CN108161333 A CN 108161333A CN 201711475602 A CN201711475602 A CN 201711475602A CN 108161333 A CN108161333 A CN 108161333A
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- CN
- China
- Prior art keywords
- welding
- vehicle frame
- frame
- plank
- groove
- Prior art date
- 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
-
- 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
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Arc Welding In General (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
Abstract
The invention discloses a kind of welding repair methods of Dump Truck Frame, are related to welding technology field.The welding repair method includes, and a notch will be respectively cut out on the front plate of the cracked part of vehicle frame and backplate, and the place polishing cleaning of REPAIR WELDING is needed to vehicle frame；X-type groove is processed in top of frame plate and bottom panel upper edge lead crack trend, to X-type groove welding；First reinforcing plank is close to top panel and bottom panel by frame interior, is welded along the edge of the first reinforcing plank；The second reinforcing plank that size is more than to notch size is close to indentation, there in front plate and backplate by frame interior, is welded along gap edge；The third that size is less than to notch size reinforces plank by being close to the second reinforcing plank outside vehicle frame, and third is reinforced plank and is welded with gap edge.For the present invention by having damaged the reparation at position to vehicle frame, vehicle frame is more secured, avoids vehicle frame replacement, saves cost, eliminate the security risk of fracture of frame.
Description
Technical field
The present invention relates to welding technology field more particularly to a kind of welding repair methods of Dump Truck Frame.
Background technology
The vehicle frame (big frame) of mine truck carries the multiple components of mine truck, when Dump Truck Frame occurs when in use
Deformation, the place that vehicle frame upper stress is concentrated will appear crackle, and the cracks of vehicle frame have the possibility of fracture at any time, this will be influenced
The safe handling of mine truck；Since vehicle frame and big case form total member, such as to replace vehicle frame, it is necessary to be vehicle frame and big case together
It replaces, this maintenance cost that will increase mine truck, and, then new car frame and the faying face of automobile worn part can not be kissed completely
It closes.Therefore, it is necessary to a kind of methods that can repair damage vehicle frame.
Invention content
Above-mentioned in order to solve the problems, such as, the present invention proposes a kind of welding repair method of Dump Truck Frame, the party
For method by beating vehicle frame crackle groove welding and reinforcing plank reinforcement of weld, the safety for eliminating the fracture of vehicle frame cracks is hidden
Suffer from, simple operation, welding structure is secured, has saved cost, improves the service life of mine truck.
To achieve these goals, the present invention uses following restorative procedure step, including：
Step S1：Prepare welding rod and reinforce plank, welding rod is subjected to drying and processing, insulation barrel is put into after welding rod processing
It is interior；
Step S2：The ground wire of the accumulator of heavy mine-vehicle is disconnected, prevents welding current from burning, these yuan of burning
Part or cause fire；Get out soldering appliance；
Step S3：By the outer surface polishing cleaning of the cracked part of vehicle frame to complete exposed section vehicle frame base material, by vehicle frame
A notch is respectively cut out in the front plate and backplate of cracked part, cracked section of inner surface of vehicle frame is polished
It clears up to complete exposed section vehicle frame base material；Polishing cleaning is in order to avoid generating pernicious gas when weldquality difference and welding
Problem；
Step S4：After the completion of vehicle frame fragmented parts cleaning work, the trend of lead crack on vehicle frame is confirmed using magnetic powder inspection；
Step S5：X-type groove is processed in top of frame plate and bottom panel upper edge lead crack trend, to X-type slope before welding
Mouth both sides carry out the pre-heat treatment；After the pre-heat treatment, the part that X-type groove is first located to frame interior is welded, then by X-type groove position
Part welding outside vehicle frame；
Step S6：Plank will be reinforced, top panel and bottom panel are close to by frame interior, the edge for reinforcing plank forms V-type slope
Mouthful, it is welded after double V-groove both sides are preheated；
Step S7：The reinforcing plank that size is more than to notch size is close to notch in front plate and backplate by frame interior
Place, the edge of notch form double V-groove, are welded after the double V-groove both sides at the edge of notch are preheated；
Step S8：The reinforcing plank that size is less than to notch size reinforces plank by being close to outside vehicle frame, reinforces the side of plank
Edge forms groove, is welded after the groove both sides for reinforcing sheet edge are preheated.
Step S9：Part is repaired to weld seam and vehicle frame and carries out post-processing.
Preferably, welding rod drying processing is in the step S1：Welding rod is put into baking oven, raising temperature to 350~
400 DEG C, 2h is kept the temperature, welding rod is then transferred to insulation barrel heat preservation.
Preferably, the pre-heat treatment before the welding is：With the range of oxygen-acetylene gas flame butt welding seam both sides 150mm
Interior the pre-heat treatment, preheating temperature is at 150~250 DEG C；So that being dried during welding rod use, the quality of weld seam ensure that.
Preferably, after the groove welding, isothermal holding first is carried out to weld seam, then weld seam hammer.
Preferably, in the step S9：Weld grinding outside vehicle frame is concordant as vehicle frame base material, after quality inspection qualification
Part is repaired to weld seam and vehicle frame and carries out preservative treatment, ensures that the vehicle frame after welding is not corroded, improves service life.
Preferably, the reinforcing plank is triangle or diamond shape, and the angle for reinforcing plank is arc transition, is avoided the occurrence of new
Stress concentration.
Preferably, the isothermal holding of the weld seam is：When frame materials are 16Mn, immediately with the rock wool of heating after welding
Or dry ash carries out covering and heat insulating to weld seam；When frame materials are alloy steel casting, first to the area of 50~100mm of weld periphery
Domain is heated to 400 DEG C, carries out welding post processing.
The welding repair method of Dump Truck Frame of the present invention is carried out by the fragmented parts to Dump Truck Frame
It beats groove welding and is reinforced using plank so that vehicle frame has damaged position reparation, and more securely, vehicle frame is avoided to replace, and saves
Cost has been saved, has eliminated the security risk of fracture of frame.
Description of the drawings
Fig. 1 is to repair Rear frame schematic cross-sectional view in the welding repair method of Dump Truck Frame of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can be more clear
The understanding of Chu, as shown in Figure 1, the present invention uses following scheme, including：
Step S1：Prepare welding rod and reinforce plank, welding rod is subjected to drying and processing, insulation barrel is put into after welding rod processing
It is interior；
Step S2：The ground wire of the accumulator of heavy mine-vehicle is disconnected, prevents welding current from burning, these yuan of burning
Part or cause fire；Get out soldering appliance；
Step S3：By the outer surface polishing cleaning of the cracked part of vehicle frame to complete exposed section vehicle frame base material, by vehicle frame
A notch is respectively cut out in the front plate 1 of cracked part and backplate 3, cracked section of inner surface of vehicle frame is beaten
Mill is cleared up to complete exposed section vehicle frame base material；Polishing cleaning is in order to avoid generating pernicious gas when weldquality difference and welding
The problem of；
Step S4：After the completion of vehicle frame fragmented parts cleaning work, the trend of lead crack on vehicle frame is confirmed using magnetic powder inspection；
Step S5：X-type groove is processed in top of frame plate 2 and 4 upper edge lead crack of bottom panel trend, to X-type before welding
Groove both sides carry out the pre-heat treatment；After the pre-heat treatment, the part that X-type groove is first located to frame interior is welded, then by X-type groove
Part welding outside vehicle frame；
Step S6：Plank 5 will be reinforced, top panel 2 and bottom panel 4 are close to by frame interior, the edge for reinforcing plank 5 is formed
Double V-groove welds after double V-groove both sides are preheated；
Step S7：The reinforcing plank 6 that size is more than to notch size is close to by frame interior in front plate 1 and backplate 3
Indentation, there, the edge of notch form double V-groove, are welded after the double V-groove both sides at the edge of notch are preheated；
Step S8：The reinforcing plank 7 that size is less than to notch size reinforces plank 6 by being close to outside vehicle frame, reinforces plank 7
Edge forms groove, will be welded after the groove both sides preheating for reinforcing 7 edge of plank.
Step S9：Part is repaired to weld seam and vehicle frame and carries out post-processing.
Welding rod drying, which is handled, in the step S1 is：Welding rod is put into baking oven, raising temperature is protected to 350~400 DEG C
Then welding rod is transferred to insulation barrel heat preservation by warm 2h.The pre-heat treatment before the welding is：With oxygen-acetylene gas flame butt welding
The pre-heat treatment in the range of seam both sides 150mm, preheating temperature is at 150~250 DEG C；So that being dried during welding rod use, weldering ensure that
The quality of seam.After the groove welding, isothermal holding first is carried out to weld seam, then weld seam hammer, reduced in weld seam
Residualinternal stress.In the step S9：, quality inspection qualification after the butt welding concordant as vehicle frame base material by weld grinding outside vehicle frame
Seam and vehicle frame repair part and carry out preservative treatment, ensure that the vehicle frame after welding is not corroded, improve service life.The securing plate
Material is triangle or diamond shape, and the angle for reinforcing plank is arc transition, avoids the occurrence of new stress concentration.The heat preservation of the weld seam
It handles and is：When frame materials are 16Mn, covering and heat insulating is carried out to weld seam with the rock wool or dry ash of heating immediately after welding；Work as vehicle
When frame material is alloy steel casting, 400 DEG C, after being welded first are heated to the region of 50~100mm of weld periphery
Reason.
Before welding job, according to the base material of vehicle frame, select it is identical with the material of the base material of vehicle frame or with similar securing plate
Material.The vehicle frame of 16Mn can be selected using J507, J506 welding rod, and E-7016 welding rods can be selected in the vehicle frame of alloy cast steel part.Welding rod
Drying isothermal holding must be carried out before use, by welding rod in baking oven, 350~400 DEG C is heated to, keeps the temperature 2h, use welding rod
Insulation barrel carries out live heat preservation, and when welding is on-demand, ensures that welding rod cannot make moist at any time, improves welding quality.
The ECU of engine, transmission system should be removed, faradic destruction when preventing from welding, by the ground wire of welding machine nearby
It is fixed near vehicle frame；Electrical equipment, fuel tank, all kinds of pipelines, oscillating bearing and mechanical engagement face etc. mutually disconnect, and
And accumulator general supply is closed, accumulator is grounded and is disconnected, welding current is avoided to destroy electrical equipment or causes fire.
The booties such as the paint in weld seam influence area are polished before welding and are cleared up, in order to avoid influence weldquality and generation one
A little pernicious gases.Using gas cutting open gap, electric arc plane or hand grinding tool polish groove to being completely exposed base metals.Segment crackle
The hole of 5~6mm can be bored in the initial segment, eliminates the problem of crack difficulty is scratched；Big section crackle can take edge point weld ddge to beat the side of groove
Method, to prevent whole beat from shifting the problem of misplacing at groove fracture of frame；Using magnetic powder inspection detect confirm crack orientation and
Confirm the crack detection after repairing.Local preheating is carried out with oxygen-acetylene gas flame before weld seam welding, heat range is weldering
Both sides 150mm or so is stitched, preheating temperature avoids hot-spot at 150~250 DEG C.By the preheating of weld seam, can further see
Examine whether crackle is eliminated completely.
During welding, prime coat should weld at a slow speed, avoid generating slag inclusion, not merge and the defects of crackle；Single face welding and double face shape
Into when refractory ceramics backing plate technology can be used；When middle layer is welded, larger core diameter, larger current, weld seam height can be selected
In base material size, then polish to put down in base material.Coating must all be removed totally after every layer of welding, and weld seam is beaten with hammering
Method reduces residualinternal stress.
Slow cooling is wanted after welding, prevents cold crack.In larger workshop or when vehicle frame is welded for outdoor,
It should be noted that preventing air-cooled, necessary block is carried out；It, will be immediately with heating after welding for the vehicle frame of 16Mn when temperature is too low
Rock wool or dry ash carry out covering and heat insulating；For the vehicle frame of alloy steel casting, after welding, first by 50~100mm of weld periphery
Region is heated to 400 DEG C and carries out welding post processing；After isothermal holding, the method for hammering is taken weld seam to reduce remaining planted agent
Power.After welding, by weld grinding, after quality inspection confirms qualification, preservative treatment is carried out.
It is necessary to using the reinforcing side for the digging notch for digging front plate and backplate when if bed panel crackle is long
Case.Plank is reinforced using triangle or diamond shape, angle uses arc transition, avoids new stress concentration phenomenon.Similar vehicle often damages
Bad position should be repaired and be reinforced before crackle generates and expands.
The welding repair method of Dump Truck Frame of the present invention is on the mine truck of Ma Gang companies in use, effect
It is very good, due to the repairing and reinforcement at fragile position, compared to the vehicle frame of original production producer, the damage of the vehicle frame after repairing and reinforcement
Period is significantly elongated.
Claims (7)
1. a kind of welding repair method of Dump Truck Frame, which is characterized in that include the following steps：
Step S1：Prepare welding rod and reinforce plank, welding rod is subjected to drying and processing, is put into insulation barrel after welding rod processing；
Step S2：The ground wire of the accumulator of heavy mine-vehicle is disconnected, gets out soldering appliance；
Step S3：By the outer surface polishing cleaning of the cracked part of vehicle frame to complete exposed section vehicle frame base material, vehicle frame is occurred
A notch is respectively cut out on the front plate (1) of fragmented parts and backplate (3), cracked section of inner surface of vehicle frame is beaten
Mill is cleared up to complete exposed section vehicle frame base material；
Step S4：After the completion of vehicle frame fragmented parts cleaning work, the trend of lead crack on vehicle frame is confirmed using magnetic powder inspection；
Step S5：X-type groove is processed in top of frame plate (2) and bottom panel (4) upper edge lead crack trend, to X-type before welding
Groove both sides carry out the pre-heat treatment；After the pre-heat treatment, the part that X-type groove is first located to frame interior is welded, then by X-type groove
Part welding outside vehicle frame；
Step S6：Plank (5) will be reinforced, top panel (2) and bottom panel (4) are close to by frame interior, and reinforce the edge of plank (5)
Double V-groove is formed, is welded after double V-groove both sides are preheated；
Step S7：The reinforcing plank (6) that size is more than to notch size is close to front plate (1) and backplate (3) by frame interior
Upper indentation, there, the edge of notch form double V-groove, are welded after the double V-groove both sides at the edge of notch are preheated；
Step S8：The reinforcing plank (7) that size is less than to notch size reinforces plank (6) by being close to outside vehicle frame, reinforces plank (7)
Edge formed groove, will reinforce plank (7) edge groove both sides preheating after weld.
Step S9：Part is repaired to weld seam and vehicle frame and carries out post-processing.
2. the welding repair method of Dump Truck Frame according to claim 1, which is characterized in that welding rod in the step S1
Drying and processing is：Welding rod is put into baking oven, raising temperature keeps the temperature 2h, welding rod then is transferred to heat preservation to 350~400 DEG C
Bucket heat preservation.
3. the welding repair method of Dump Truck Frame according to claim 1, which is characterized in that the preheating before the welding
It handles and is：With the pre-heat treatment in the range of oxygen-acetylene gas flame butt welding seam both sides 150mm, preheating temperature is at 150~250 DEG C.
4. the welding repair method of Dump Truck Frame according to claim 1, it is characterised in that：After the groove welding,
Isothermal holding first is carried out to weld seam, then weld seam hammer.
5. the welding repair method of Dump Truck Frame according to claim 1, which is characterized in that in the step S9：It will
Weld grinding is concordant as vehicle frame base material outside vehicle frame, and repairing part to weld seam and vehicle frame after quality inspection qualification carries out at anti-corrosion
Reason.
6. the welding repair method of Dump Truck Frame according to claim 1, it is characterised in that：The reinforcing plank is three
Angular or diamond shape, the angle for reinforcing plank are arc transition.
7. the welding repair method of Dump Truck Frame according to claim 4, which is characterized in that at the heat preservation of the weld seam
It manages and is：When frame materials are 16Mn, covering and heat insulating is carried out to weld seam with the rock wool or dry ash of heating immediately after welding；Work as vehicle frame
When material is alloy steel casting, 400 DEG C first are heated to the region of 50~100mm of weld periphery, carries out welding post processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711475602.2A CN108161333A (en) | 2017-12-29 | 2017-12-29 | A kind of welding repair method of Dump Truck Frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711475602.2A CN108161333A (en) | 2017-12-29 | 2017-12-29 | A kind of welding repair method of Dump Truck Frame |
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| CN108161333A true CN108161333A (en) | 2018-06-15 |
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| CN201711475602.2A Pending CN108161333A (en) | 2017-12-29 | 2017-12-29 | A kind of welding repair method of Dump Truck Frame |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109530886A (en) * | 2019-01-02 | 2019-03-29 | 马钢集团矿业有限公司 | A kind of heavy type electric excavator twin beams box-shaped shovel bar fracture welding and restoring process |
| CN110508995A (en) * | 2019-08-26 | 2019-11-29 | 共享装备股份有限公司 | The restorative procedure of ironcasting cracking |
| 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 |
| CN112872709A (en) * | 2021-01-29 | 2021-06-01 | 中国建筑土木建设有限公司 | Pitted surface renovating structure of prefabricated box girder template and maintenance method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706974A (en) * | 2013-12-02 | 2014-04-09 | 唐雅蓉 | Patching welding repair process for automobile frame |
| CN103706975A (en) * | 2013-12-02 | 2014-04-09 | 唐雅蓉 | Welding process for short cracks of automobile frame |
| EP2756907A1 (en) * | 2013-01-21 | 2014-07-23 | Siemens Aktiengesellschaft | Built-up welding with an external thicker outline contour |
| CN105689857A (en) * | 2014-11-28 | 2016-06-22 | 重庆基石机械有限公司 | Tower drum manufacturing welding process |
-
2017
- 2017-12-29 CN CN201711475602.2A patent/CN108161333A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2756907A1 (en) * | 2013-01-21 | 2014-07-23 | Siemens Aktiengesellschaft | Built-up welding with an external thicker outline contour |
| CN103706974A (en) * | 2013-12-02 | 2014-04-09 | 唐雅蓉 | Patching welding repair process for automobile frame |
| CN103706975A (en) * | 2013-12-02 | 2014-04-09 | 唐雅蓉 | Welding process for short cracks of automobile frame |
| CN105689857A (en) * | 2014-11-28 | 2016-06-22 | 重庆基石机械有限公司 | Tower drum manufacturing welding process |
Non-Patent Citations (2)
| Title |
|---|
| 李仕慧 等: "《非公路矿用自卸车车架材料及焊接工艺优化》", 《焊接技术》 * |
| 陆刚: "《汽车车架疲劳断裂损坏的焊接修复》", 《焊接技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109530886A (en) * | 2019-01-02 | 2019-03-29 | 马钢集团矿业有限公司 | A kind of heavy type electric excavator twin beams box-shaped shovel bar fracture welding and restoring process |
| CN110508995A (en) * | 2019-08-26 | 2019-11-29 | 共享装备股份有限公司 | The restorative procedure of ironcasting cracking |
| 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 |
| CN112872709A (en) * | 2021-01-29 | 2021-06-01 | 中国建筑土木建设有限公司 | Pitted surface renovating structure of prefabricated box girder template and maintenance method thereof |
| CN112872709B (en) * | 2021-01-29 | 2022-05-17 | 中国建筑土木建设有限公司 | Method for renovating and maintaining pitted surface of prefabricated box girder template |
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Application publication date: 20180615 |