CN105414709A - Welding repair method for large nodular iron castings - Google Patents
Welding repair method for large nodular iron castings Download PDFInfo
- Publication number
- CN105414709A CN105414709A CN201510940389.2A CN201510940389A CN105414709A CN 105414709 A CN105414709 A CN 105414709A CN 201510940389 A CN201510940389 A CN 201510940389A CN 105414709 A CN105414709 A CN 105414709A
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- welding
- repair
- iron castings
- nodular iron
- repair method
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Classifications
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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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/06—Cast-iron alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding repair method for large nodular iron castings. A technical solution of the welding repair method is specifically as follows: adopting a shielded metal arc welding method; carrying out preheating before welding; adopting low linear energy and narrow bead welding operations; adopting such measures as short segment welding, intermittent welding and dispersed welding, and immediate hammering on welding seams after welding; selecting reasonable welding direction and order; employing an insert repair welding method; and applying a screw drilled welding method on a welding groove surface. The welding repair method for large nodular iron castings provided by the present invention is simple, high in operability, and capable of effectively repairing large nodular iron castings, thereby reducing economic losses.
Description
Technical field
The invention belongs to the reparation field of large-scale ductile iron part, particularly relate to a kind of welding repair method of large-scale ductile iron part.
Background technology
Spheroidal graphite cast-iron is 20th century a kind of high-strength cast iron materials of growing up of the fifties, and its combination property, close to steel, just based on the performance of its excellence, has been successfully used to cast some stressed complexity, and intensity, toughness, wearability require higher part.Spheroidal graphite cast-iron developed rapidly for be only second to casting pig, application cast iron materials very widely.So-called " with iron for steel ", mainly refers to spheroidal graphite cast-iron.Spheroidal graphite cast-iron obtains globular graphite by nodularization and inoculation, effectively improves the mechanical performance of cast iron, in particular improve plasticity and toughness, thus obtain the intensity also higher than carbon steel.
Large-scale ductile iron part, as spheroidal graphite cast-iron cement raw meal mill mill once damage, extremely difficult reparation, subject matter during Nodular Iron Welding is:
1, easily there is spoken parts in traditional operas and hardened structure in welding point.Because weld metal cooling velocity is fast, be different from the cooling velocity of cast iron in molding sand, and have part cast iron mother metal to fuse into weld seam, the phosphorus content of weld seam is increased, the incomplete fusion zone of heat affected area and weld seam easily produce martensite hardened structure, and mother metal easily produces the tissue of the poor-performings such as white structure.
2) easily there is cold crack and fire check in Nodular Iron Welding joint.Cold crack occurs usually below 400 DEG C, and producing cause is the acting in conjunction due to cast iron plasticity difference and welding constraint stress.Fire check is because the effect of welding stress in low melting point eutectic and crystallization process produces, relevant with sulfur content, mostly occurs in the heterogeneous sea welding metal adopting Ni-based and mild steel welding material.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of welding repair method of large-scale ductile iron part, and method is simple, and operability is high, can effectively repair large-scale ductile iron part, reduces economic loss.
For realizing above-mentioned technique effect, the invention provides a kind of welding repair method of large-scale ductile iron part, its concrete technical scheme is as follows:
One, adopt welding rod arc welding method, nickel-base welding rod EZNi-1 (Z308) or dilval welding rod EZNiFe-1 (Z408) selected by welding material;
Two, weld preheating, preheat temperature is 120 ~ 150 DEG C;
Three, adopt little heat input, string(er) bead welding operation, reduce dilution rate, reduce incomplete fusion zone chill width;
Four, take the measure such as hammering weld seam immediately of short section of weldering, discontinuous welding, dispersion weldering and postwelding, reduce welding stress;
Five, rational welding direction and order is selected.Should grasp by the large position of rigidity to the little position welding principle of rigidity, during repair crack, welding direction is carry out segmentation welding from closed crack-tip to the openend of crackle;
Six, insert repair welding method can be used, namely in the intensive place of crackle or the welding larger position of loading, this position can be removed, and be bumped into low carbon steel plate or the good material of other welding performances, change weld seam distributing position;
Seven, studding method can be used at welding groove surface, be exactly boring, tapping on mother metal groove face, mild steel screw is screwed into, weld centered by screw, can prevent weld seam from peeling off from mother metal, and improve the ability of the load that withstands shocks, be used for the repair welding of thick large ironcasting.
The metal chemical composition of EZNi-1, EZNiFe-1 welding rod, mechanical property
The welding repair method of a kind of large-scale ductile iron part proposed by the invention, method is simple, and operability is high, can effectively repair large-scale ductile iron part, reduces economic loss.
Detailed description of the invention
A welding repair method for large-scale ductile iron part, its concrete technical scheme is as follows:
One, adopt welding rod arc welding method, nickel-base welding rod EZNi-1 (Z308) or dilval welding rod EZNiFe-1 (Z408) selected by welding material;
Two, weld preheating, preheat temperature is 120 ~ 150 DEG C;
Three, adopt little heat input, string(er) bead welding operation, reduce dilution rate, reduce incomplete fusion zone chill width;
Four, take the measure such as hammering weld seam immediately of short section of weldering, discontinuous welding, dispersion weldering and postwelding, reduce welding stress;
Five, rational welding direction and order is selected.Should grasp by the large position of rigidity to the little position welding principle of rigidity, during repair crack, welding direction is carry out segmentation welding from closed crack-tip to the openend of crackle;
Six, insert repair welding method can be used, namely in the intensive place of crackle or the welding larger position of loading, this position can be removed, and be bumped into low carbon steel plate or the good material of other welding performances, change weld seam distributing position;
Seven, studding method can be used at welding groove surface, be exactly boring, tapping on mother metal groove face, mild steel screw is screwed into, weld centered by screw, can prevent weld seam from peeling off from mother metal, and improve the ability of the load that withstands shocks, be used for the repair welding of thick large ironcasting.
The metal chemical composition of EZNi-1, EZNiFe-1 welding rod, mechanical property
The REPAIR WELDING example of spheroidal graphite cast-iron cement raw meal mill mill:
Certain type vertical cement raw mill is the cement manufacture plant from external import, and in Long-Time Service, raw mill mill crack at edge, causes stopping production.Mill material is spheroidal graphite cast-iron, grinding wheel diameter ф 3200mm, and weight reaches 31 tons, and crack length reaches 3600mm, degree of depth 180mm, and edge has split logical, and crack the widest part reaches 40mm, and has a large amount of foreign material.
Nickel-base welding rod arc cold-welding technique is have employed, the welding and restoring process main points of spheroidal graphite cast-iron cement raw meal mill mill during reparation:
1, drill at the propagation direction of crackle the stop hole that diameter is ф 12mm.
2, ore, the foreign material in crack district are repeatedly cleared up with compressed air and giant.
3, adopt oxy-acetylene flame heating, utilize self-control gate fixture and gear pump, make the reset of crack district, location as far as possible, recover accessory appearance size.
4, adopt carbon arc air gouging along preparation outside, crack bevel for welding, bevel angle is 70 °, and mean depth is 65mm; Preparation inner side bevel for welding, bevel angle is 40 °, and mean depth is 35mm.And remove carbon arc air gouging layer 3mm with electric angle grinder, remove the corrosion layer within the scope of 30mm around groove, expose metallic luster.
5, in the bevel for welding of outside, every limit studding two is arranged, and in being staggered, spacing is 20mm, screw diameter ф 10mm, degree of depth 15mm, exceeds groove plane 3mm.6) prepare material to be Q235, to be of a size of the steel plate panel some of 150mm × 10mm (width × thickness).
6, welding rod arc welding method is adopted.
7, REPAIR WELDING selects EZNiFe-1 (Z408) ф 3.2mm welding rod, dries through 200 DEG C × 1 hour; Select E5015 (J507) ф 3.2mm welding rod, dried through 350 DEG C × 2 hours.
8, weld preheating, preheat temperature 145 DEG C >=T >=125 DEG C, and control interlayer temperature.
9, after studding completes, with EZNiFr-1 (Z408) welding rod, in the bevel for welding of outside, weld three layers of transition zone, per pass fusion length is no more than 100mm, does not swing during welding operation.
10, adopt multi-pass welding, the staggered overlap joint of weld seam, piecemeal skip welding, often welds together hammering weld seam immediately.
11, outside groove welding is to 1/3 of groove depth, then completes the welding of inner side groove.
12, vertical assembling in side slope mouth outside subsequently, welding Q235 steel plate panel, welding material is E5010 (J507) welding rod, to reduce rehabilitation cost, to reduce welding loading, completes the welding of outside groove, and is polished flat by face of weld.
13, postwelding carries out face crack inspection.
The welding repair method of a kind of large-scale ductile iron part proposed by the invention, method is simple, and operability is high, can effectively repair large-scale ductile iron part, reduces economic loss.
Claims (1)
1. a welding repair method for large-scale ductile iron part, its concrete technical scheme is as follows:
One, welding rod arc welding method is adopted, nickel-base welding rod EZNi-1 (Z308) or dilval welding rod EZNiFe-1 (Z408) selected by welding material, and metal chemical composition, the mechanical property of EZNi-1, EZNiFe-1 welding rod are:
Two, weld preheating, preheat temperature is 120 ~ 150 DEG C;
Three, adopt little heat input, string(er) bead welding operation, reduce dilution rate, reduce incomplete fusion zone chill width;
Four, take the hammering weld seam measure immediately of short section of weldering, discontinuous welding, dispersion weldering and postwelding, reduce welding stress;
Five, by the large position of rigidity to the little position welding of rigidity, during repair crack, welding direction is carry out segmentation welding from closed crack-tip to the openend of crackle;
Six, use insert repair welding method, namely in the intensive place of crackle or the welding larger position of loading, this position is removed, and is bumped into low carbon steel plate or the good material of other welding performances, change weld seam distributing position;
Seven, use studding method at welding groove surface, be exactly boring, tapping on mother metal groove face, mild steel screw be screwed into, weld centered by screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510940389.2A CN105414709A (en) | 2015-12-15 | 2015-12-15 | Welding repair method for large nodular iron castings |
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| CN201510940389.2A CN105414709A (en) | 2015-12-15 | 2015-12-15 | Welding repair method for large nodular iron castings |
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| CN105414709A true CN105414709A (en) | 2016-03-23 |
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| CN201510940389.2A Pending CN105414709A (en) | 2015-12-15 | 2015-12-15 | Welding repair method for large nodular iron castings |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855788A (en) * | 2016-06-03 | 2016-08-17 | 金川集团股份有限公司 | Welding process for repairing crack of ball milling iron casting |
| CN106216819A (en) * | 2016-07-21 | 2016-12-14 | 金川集团股份有限公司 | A kind of solder technology of rotten spheroidal graphite cast-iron |
| CN106270966A (en) * | 2016-08-26 | 2017-01-04 | 常州华德机械有限公司 | A kind of process welding low-temperature spheroidal iron and manganese steel plate |
| CN106583881A (en) * | 2016-12-13 | 2017-04-26 | 西安铂力特激光成形技术有限公司 | Cast iron arc welding repair method |
| CN109014648A (en) * | 2018-08-23 | 2018-12-18 | 哈尔滨中正焊接技术开发有限公司 | The welding structure and its reinforcement of steel-casting metal defect digging weldering groove |
| CN109352199A (en) * | 2018-11-26 | 2019-02-19 | 安徽马钢工程技术集团有限公司 | A kind of restorative procedure of gray cast iron heterogeneous sea welding |
| CN109500477A (en) * | 2018-11-21 | 2019-03-22 | 中船海洋动力部件有限公司 | A kind of repairing method with welding suitable for spheroidal graphite cast-iron |
| CN111168322A (en) * | 2019-12-31 | 2020-05-19 | 湖北腾升科技股份有限公司 | Repair welding process of nodular cast iron roller |
| CN111318781A (en) * | 2018-12-17 | 2020-06-23 | 天津市英源焊接技术有限公司 | Repair process for repairing, welding and reinforcing cracks of engine room chassis of wind generating set |
| CN112475531A (en) * | 2020-11-23 | 2021-03-12 | 西安热工研究院有限公司 | Welding repair method for nodular cast iron main frame of wind turbine generator |
| CN112589241A (en) * | 2019-10-01 | 2021-04-02 | 合肥中亚建材装备有限责任公司 | Vertical grinding roller core inclined plane welding repair method |
| CN113172361A (en) * | 2021-05-12 | 2021-07-27 | 远景能源有限公司 | Method and system for welding and repairing hub of wind generating set |
| CN113695706A (en) * | 2020-05-21 | 2021-11-26 | 庆铃汽车（集团）有限公司 | Semi-hot welding method for castings |
| CN113909736A (en) * | 2021-09-28 | 2022-01-11 | 杭州华光焊接新材料股份有限公司 | Nickel-based alloy welding powder and manufacturing method and using method thereof |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855788A (en) * | 2016-06-03 | 2016-08-17 | 金川集团股份有限公司 | Welding process for repairing crack of ball milling iron casting |
| CN106216819A (en) * | 2016-07-21 | 2016-12-14 | 金川集团股份有限公司 | A kind of solder technology of rotten spheroidal graphite cast-iron |
| CN106216819B (en) * | 2016-07-21 | 2018-06-08 | 金川集团股份有限公司 | A kind of welding technique of rotten spheroidal graphite cast-iron |
| CN106270966A (en) * | 2016-08-26 | 2017-01-04 | 常州华德机械有限公司 | A kind of process welding low-temperature spheroidal iron and manganese steel plate |
| CN106270966B (en) * | 2016-08-26 | 2019-01-25 | 常州华德机械有限公司 | A kind of process for welding low-temperature spheroidal iron and manganese steel plate |
| CN106583881A (en) * | 2016-12-13 | 2017-04-26 | 西安铂力特激光成形技术有限公司 | Cast iron arc welding repair method |
| CN109014648A (en) * | 2018-08-23 | 2018-12-18 | 哈尔滨中正焊接技术开发有限公司 | The welding structure and its reinforcement of steel-casting metal defect digging weldering groove |
| CN109500477A (en) * | 2018-11-21 | 2019-03-22 | 中船海洋动力部件有限公司 | A kind of repairing method with welding suitable for spheroidal graphite cast-iron |
| CN109352199A (en) * | 2018-11-26 | 2019-02-19 | 安徽马钢工程技术集团有限公司 | A kind of restorative procedure of gray cast iron heterogeneous sea welding |
| CN111318781A (en) * | 2018-12-17 | 2020-06-23 | 天津市英源焊接技术有限公司 | Repair process for repairing, welding and reinforcing cracks of engine room chassis of wind generating set |
| CN112589241A (en) * | 2019-10-01 | 2021-04-02 | 合肥中亚建材装备有限责任公司 | Vertical grinding roller core inclined plane welding repair method |
| CN111168322A (en) * | 2019-12-31 | 2020-05-19 | 湖北腾升科技股份有限公司 | Repair welding process of nodular cast iron roller |
| CN113695706A (en) * | 2020-05-21 | 2021-11-26 | 庆铃汽车（集团）有限公司 | Semi-hot welding method for castings |
| CN112475531A (en) * | 2020-11-23 | 2021-03-12 | 西安热工研究院有限公司 | Welding repair method for nodular cast iron main frame of wind turbine generator |
| CN113172361A (en) * | 2021-05-12 | 2021-07-27 | 远景能源有限公司 | Method and system for welding and repairing hub of wind generating set |
| CN113909736A (en) * | 2021-09-28 | 2022-01-11 | 杭州华光焊接新材料股份有限公司 | Nickel-based alloy welding powder and manufacturing method and using method thereof |
| CN113909736B (en) * | 2021-09-28 | 2023-04-21 | 杭州华光焊接新材料股份有限公司 | Nickel-based alloy welding powder and manufacturing method and using method thereof |
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Application publication date: 20160323 |