CN106583881A - Cast iron arc welding repair method - Google Patents

Cast iron arc welding repair method Download PDF

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Publication number
CN106583881A
CN106583881A CN201611148044.4A CN201611148044A CN106583881A CN 106583881 A CN106583881 A CN 106583881A CN 201611148044 A CN201611148044 A CN 201611148044A CN 106583881 A CN106583881 A CN 106583881A
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CN
China
Prior art keywords
welding
insert
failure
arc
cast iron
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Pending
Application number
CN201611148044.4A
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Chinese (zh)
Inventor
赵晓明
石浩
成军伟
熊嘉锋
程宝
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Xian Bright Laser Technologies Co Ltd
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Xian Bright Laser Technologies Co Ltd
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Filing date
Publication date
Application filed by Xian Bright Laser Technologies Co Ltd filed Critical Xian Bright Laser Technologies Co Ltd
Priority to CN201611148044.4A priority Critical patent/CN106583881A/en
Publication of CN106583881A publication Critical patent/CN106583881A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00Restoring or reconditioning objects

Abstract

The invention discloses a cast iron arc welding repair method. The method comprises the steps that surface cracks of a defect area of a failure iron casting are firstly removed, the failure iron casting is scanned, a three-dimensional model of the failure iron casting is obtained, a casting original model and the failure model are subjected to comparison differencing, and an insert model of the defect area of the iron casting is obtained reversely; the insert model is subjected to layering treatment through subdivision software, an arc welding forming path procedure is generated, the procedure and arc welding forming process parameters are guided into arc welding additive manufacturing equipment, and inserts are formed layer by layer; and welding materials used for insert forming are adopted for welding the inserts to defects on the failure iron casting, and iron casting repair can be completed. According to the arc welding repair method, the cracking tendency of welding repair of the iron casting can be reduced, the inserts large in size or complex in structure can be formed, and the method is especially suitable for the iron casting large in repair defect area and complex in shape.

Description

A kind of method that cast iron arc-welding is repaired
Technical field
The invention belongs to increases material manufacturing technology field, and in particular to a kind of method that cast iron arc-welding is repaired.
Background technology
Cast iron has a relatively low fusing point, excellent casting character, and with good wearability and damping property and low Notch sensitivity, is widely used in the industries such as machine-building, metallurgy, mine.Ironcasting in casting process inevitably There are the defects such as pore, crackle, misrun, in use because the difference of applying working condition causes the damage of many reasons, cause Workpiece is prevented from normally using.If more renewing part, increase production cost, the production cycle is also longer, therefore, often to the ironcasting that fails Carry out reparation to remanufacture.The most frequently used is exactly REPAIR WELDING, can carry out on-the-spot welding, and cycle is short is convenient and swift, and cost is much low In new part is bought, its economic benefit is huge.
At present, mainly cast iron is repaired using cold welding method, half hot weld method and hot weld method.Cold welding method is typically using thin straight Footpath is Ni-based or austenitic stainless steel wlding, and workpiece is not preheated before weldering, and using the short-track weldering of small current, discontinuously segmentation welding, postwelding stands Horse hammers welding bead to eliminate welding stress;Hot weld method adopts homogeneity wlding, 600 DEG C~700 DEG C of weld preheating, 400 DEG C of postwelding with Upper insulation, welding bead temperature gradient is little, and slow cooling is conducive to avoiding the occurrence of white structure, reduces welding stress, prevents crackle;Half Hot welding is that ironcasting is wholly or partially preheating to 300 DEG C~400 DEG C, and interlayer temperature is controlled in work progress, weldering Afterwards workpiece heat-preservation cotton wraps up slow cooling, and half hot weld method improves execution conditions relative to hot weld method, reduces welding cost, but weld seam Anti-crack hydraulic performance decline.
Ironcasting phosphorus content is high, and the impurity content such as sulfur and phosphorus is higher, and fire check is easily produced in welding process;Casting Ironware intensity and plasticity and toughness are poor, easily produce thermal stress because being heated uneven in welding process, Seam and heat effected zone Easily generate hardened structure and produce structural stress, easily ftracture, REPAIR WELDING difficulty is very big.For defect than it is larger and repair after The high cast iron wall pieces of required precision, such as engine cylinder-body regional area are worn and torn or are come off, if directly carrying out REPAIR WELDING, welding is repaiied Multiple region is larger, and welding constraint (restraint) degree is larger, is very easy to crackle occur in welding process.
The content of the invention
It is an object of the invention to provide a kind of method that cast iron arc-welding is repaired, shapes insert, by insert and base by arc-welding Body is welded on one piece of mode, solves the reparation of the wall pieces ironcasting that there is larger defect or there is intensive intersection crack defect Problem.
The technical solution adopted in the present invention is that a kind of method that cast iron arc-welding is repaired is comprised the following steps:
Step 1, pretreatment
To failing, Iron Casting Defects region carries out grinding process, removes face crack;
Step 2, generation insert model
By spatial digitizer scanning failure ironcasting, the threedimensional model of failure ironcasting is obtained, by foundry goods archetype Contrast is carried out with failure model and ask poor, inversely obtain the insert model in Iron Casting Defects region;
Step 3, insert are generated
Layered shaping is carried out to insert model by subdivision software, the path of welding program of insert arc-welding shaping is generated, will Path of welding and forming parameters import arc-welding increasing material manufacturing equipment, successively shape insert.
Step 4, renovation technique
The fault location being welded on insert using the wlding used by shaping insert on failure ironcasting, completes repairing for ironcasting It is multiple.
Of the invention the characteristics of, also resides in:
When step 1 carries out grinding process, Liquid penetrant testing is carried out to polishing region, detection top layer whether there is crackle, if depositing Continuing removal top layer crackle of polishing.
Wlding used by step 3 shaping insert can be Ni-based wlding.Nickel and ferrum can mutual solid solution in any proportion, and be Stronger graphite element, during high temperature, diffusion coefficient is big, and nickel spreads to cast iron mother metal in welding fusion area, reduces the region The width of white structure, makes white structure in discontinuously distribution;Nickel-based welding wire welding seam toughness is good, reduces weld seam and inclining for crackle occurs To from nickel-based welding wire, Seam and heat effected zone is not easy to crack.
The shaping of step 3 insert adopts arc-welding forming technique, forming parameters to include, welding current 90A~150A, voltage 12.5V~18V, speed of welding 20cm/min~50cm/min, control interlayer temperature is less than 200 DEG C.
Step 4 insert is welded on welding parameter when failing on ironcasting to be included, welding current 100A~140A, voltage 14V~23V, speed of welding 20cm/min~50cm/min.
Insert is welded on failure ironcasting and is gone forward by step 4, and insert and failure Iron Casting Defects region are polished, and is opened Bevel for welding, makes insert and failure ironcasting groove angle of inclination close, and the groove slope angle per side is 30 °~60 °, and two Butt welding between person, preset clearance is 2mm~3mm.
The invention has the beneficial effects as follows, the method for the arc-welding reparation of the present invention is welded using insert repair welding method to ironcasting Reparation is connect, insert and reparation repair welding are selected identical material, can reduce the crackle tendency of ironcasting REPAIR WELDING.The method is led to Arc-welding increasing material manufacturing process forming insert is crossed, is not limited by defect volume and shape, formable volume is larger or complex structure Insert, defect pattern larger for defect area is complicated or ironcasting that there is close defect can be suitable for.
Description of the drawings
Fig. 1 is the ironcasting archetype of the embodiment of the present invention 1;
Fig. 2 is the ironcasting failure model of the embodiment of the present invention 1;
Fig. 3 is the ironcasting insert model of the embodiment of the present invention 1;
Fig. 4 is the welding sequence schematic diagram that the embodiment of the present invention 1 is segmented welding;
Fig. 5 is the ironcasting archetype of the embodiment of the present invention 2;
Fig. 6 is the ironcasting failure model of the embodiment of the present invention 2;
Fig. 7 is the ironcasting insert model of the embodiment of the present invention 2.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention is described in further detail, but the present invention is not limited to These embodiments.
Embodiment 1
Repaired as a example by HT250 casting pig engine cylinder-body outer walls fall block defect by cold welding method and illustrated, outside the electromotor Wall defect area is larger, and defect pattern is complex, and concrete renovation technique is as follows:
Step 1, pretreatment
Cast iron engine housing exterior walls are fallen with block region carries out grinding process, and flame heating removes greasy dirt, the water mark of surrounding And crack defect, and Liquid penetrant testing is carried out to polishing region, if detection shows that top layer has crackle, further polishing removal is split Stricture of vagina.
Step 2, generation insert model
The motor body that outer wall falls block is scanned by spatial digitizer, the three-dimensional failure mould of the housing to be repaired is obtained Type, as shown in Fig. 2 electromotor archetype (such as Fig. 1) and failure model are carried out into contrast by three dimensional analysis software asks poor, it is inverse To the insert model for obtaining Iron Casting Defects region, as shown in Figure 3.
Step 3, insert are generated
Layered shaping is carried out to insert model by subdivision software, and path of welding planning is carried out to per layer, obtain insert The path of welding of arc-welding shaping;Select arc welding technology, set welding condition as:Welding current 95A~105A, voltage 13.0V~14.0V, speed of welding 46cm/min, control interlayer temperature is less than 200 DEG C.Insert arc-welding forming path program is defeated Enter in ABB welding robot controllers, from the Ni-based cast iron special welding wire CASTWELD Ni55 of a diameter of Φ 1.2mm, Successively insert entity is shaped by road arc-welding using welding manipulator on substrate, cut insert by line with substrate after the completion of welding Cut separation.
Step 4, renovation technique
Grinding process is carried out to the eroded area of insert and motor body, the two is per side slope mouth opening slope 45 °, therebetween preset clearance is 2~3mm.
From with the Ni-based wlding of identical in step 3, using cold welding method, insert is fixed on by manual welding technology spot welding On the defect area of motor body, then using segmentation welding procedure, by insert according to the path of welding 1 → 2 in accompanying drawing 4 → 3 ... 11 → 12 are welded successively, and welding condition is:100~110A of welding current, voltage 14V~16V, speed of welding 30cm/min~40cm/min, workpiece temperature is less than 80 DEG C before control welding.Entered with hand hammer in time after the completion of the welding of per pass weld seam Row is tapped, and hammer is cooled to room temperature all over whole piece weld seam up to face of weld, to reduce welding residual stress, until completing whole insert Reparation.
Embodiment 2
Certain diesel-engine body (such as Fig. 5), material is nodular cast iron QT400-18, has multiple tracks to intersect crackle (as schemed at repair welding 6), if taking weld line technique one by one, intensive intersection crackle can be produced due to the repair welding stress concentration in infall, is Zonule defect.The present embodiment will be excavated at this, and welding generates insert, insert is welded on body using hot weld method, specifically Renovation technique is as follows:
Step 1, pretreatment
Defect is conscientiously checked, intersection crackle is excavated, Liquid penetrant testing is carried out to polishing region, if detection shows that top layer is present splitting Stricture of vagina, further polishing removes crackle.According to the pattern for intersecting crackle, close rectangle that the defect area excavated is polished as far as possible, It is easy to follow-up welding forming (such as Fig. 7) and the polishing to insert.
Step 2, generation insert model
Diesel-engine body defect area is scanned by spatial digitizer, the three-dimensional failure model of the matrix to be repaired is obtained, Diesel-engine body archetype (such as Fig. 5) and failure model contrast are asked into poor by three dimensional analysis software, diesel engine is inversely obtained The insert model of body defect area.
Step 3, insert are generated
Layered shaping is carried out to insert model by subdivision software, and path of welding planning is carried out to per layer, obtain insert The path of welding of arc-welding shaping;It is automatic using Digit Control Machine Tool on substrate from the H08Mn2Si welding wires of a diameter of Φ 1.2mm TIG equipment, arc-welding shapes insert, set welding condition as:Welding current 130A~150A, voltage 14.5V~ 17.0V, speed of welding 20cm/min, control interlayer temperature is less than 200 DEG C.Successively go out after insert entity by road welding forming, lead to Cross wire cutting to separate insert with substrate.
Step 4, renovation technique
Grinding process is carried out to the eroded area of insert and motor body, the two is per side slope mouth opening slope 60 °, therebetween preset clearance is 2mm~3mm.
From with identical wlding in step 3, insert is fixed on into the defect area of diesel-engine body by craft MAG spot welding On domain, then position at this is preheating to into 600 DEG C~700 DEG C, the welding of insert and body, Welder are soldered into using manual MAG Skill parameter is:Welding current 120A~140A, voltage 17V~23V, speed of welding 30cm/min~40cm/min.
Workpiece temperature is not less than 400 DEG C before control welding, and postwelding is immediately covered in flake asbestos around welding bead, slow cold But.
Said method can reduce the crackle tendency of ironcasting REPAIR WELDING, it is adaptable to which cast iron wall pieces are present intersects crackle Repair.

Claims (6)

1. a kind of method that cast iron arc-welding is repaired, it is characterised in that comprise the following steps:
Step 1, pretreatment
To failing, Iron Casting Defects region carries out grinding process, removes face crack;
Step 2, generation insert model
By spatial digitizer scanning failure ironcasting, the threedimensional model of failure ironcasting is obtained, by foundry goods archetype and mistake Effect model carries out contrast and asks poor, inversely obtains the insert model in Iron Casting Defects region;
Step 3, insert are generated
Layered shaping is carried out to insert model by subdivision software, the path of welding program of insert arc-welding shaping is generated, will be welded Path and forming parameters import arc-welding increasing material manufacturing equipment, successively shape insert;
Step 4, renovation technique
The fault location being welded on insert using the wlding used by shaping insert on failure ironcasting, completes the reparation of ironcasting.
2. the method that cast iron arc-welding according to claim 1 is repaired, it is characterised in that step 3 is shaped used by the insert Wlding be Ni-based wlding.
3. the method that cast iron arc-welding according to claim 2 is repaired, it is characterised in that insert shaping described in step 3 is adopted Arc-welding recovery technique, forming parameters include, 90~150A of welding current, voltage 12.5V~18V, speed of welding 20cm/ Min~50cm/min, control interlayer temperature is less than 200 DEG C.
4. the method that cast iron arc-welding according to claim 1 is repaired, it is characterised in that insert described in step 4 is welded on mistake Welding parameter includes when on effect ironcasting, welding current 100A~140A, voltage 14V~23V, speed of welding 20cm/min~ 50cm/min。
5. the method that cast iron arc-welding according to claim 1 is repaired, it is characterised in that insert is welded on failure by step 4 Ironcasting is gone forward, and grinding process is carried out to insert and failure Iron Casting Defects region, and bevelling makes insert and failure cast iron Part groove angle of inclination is close, and the groove slope angle per side is 30 °~60 °, butt welding between the two, and preset clearance is 2~3mm.
6. the method that cast iron arc-welding according to claim 1 is repaired, it is characterised in that right when step 1 carries out grinding process Polishing region carries out Liquid penetrant testing, and detection top layer whether there is crackle, if existing, continuing to polish removes top layer crackle.
CN201611148044.4A 2016-12-13 2016-12-13 Cast iron arc welding repair method Pending CN106583881A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108480912A (en) * 2018-05-31 2018-09-04 广州中船文冲船坞有限公司 Welding repair method is changed in the digging of ironcasting
CN109079143A (en) * 2017-06-13 2018-12-25 中国航发商用航空发动机有限责任公司 The method for removing precinct laser fusion formation of parts surface of internal cavity crackle
CN109249179A (en) * 2017-07-13 2019-01-22 鞍钢股份有限公司 A kind of method that mechanical equipment abnormal deformation is quickly repaired
CN110039255A (en) * 2019-04-24 2019-07-23 上海外高桥造船有限公司 Cast iron pump body repairs welding method
CN111438449A (en) * 2020-04-16 2020-07-24 苏州热工研究院有限公司 3D printing remanufacturing process and system for flange of nuclear power plant
CN111545988A (en) * 2020-03-31 2020-08-18 广州文冲船舶修造有限公司 Repair method for prolonging service life of brake hub of marine anchor cable machine
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
CN112743292A (en) * 2020-10-21 2021-05-04 中国科学院金属研究所 Argon arc brazing repair method for cast iron part

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109079143A (en) * 2017-06-13 2018-12-25 中国航发商用航空发动机有限责任公司 The method for removing precinct laser fusion formation of parts surface of internal cavity crackle
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CN109249179A (en) * 2017-07-13 2019-01-22 鞍钢股份有限公司 A kind of method that mechanical equipment abnormal deformation is quickly repaired
CN108480912A (en) * 2018-05-31 2018-09-04 广州中船文冲船坞有限公司 Welding repair method is changed in the digging of ironcasting
CN110039255A (en) * 2019-04-24 2019-07-23 上海外高桥造船有限公司 Cast iron pump body repairs welding method
CN111545988A (en) * 2020-03-31 2020-08-18 广州文冲船舶修造有限公司 Repair method for prolonging service life of brake hub of marine anchor cable machine
CN111545988B (en) * 2020-03-31 2021-03-16 广州文冲船舶修造有限公司 Repair method for prolonging service life of brake hub of marine anchor cable machine
CN111438449A (en) * 2020-04-16 2020-07-24 苏州热工研究院有限公司 3D printing remanufacturing process and system for flange of nuclear power plant
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
CN112743292A (en) * 2020-10-21 2021-05-04 中国科学院金属研究所 Argon arc brazing repair method for cast iron part

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Application publication date: 20170426