CN1107088A - Cold-welding recovery method for thin wall of cast iron cylinder - Google Patents
Cold-welding recovery method for thin wall of cast iron cylinder Download PDFInfo
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- CN1107088A CN1107088A CN 94104401 CN94104401A CN1107088A CN 1107088 A CN1107088 A CN 1107088A CN 94104401 CN94104401 CN 94104401 CN 94104401 A CN94104401 A CN 94104401A CN 1107088 A CN1107088 A CN 1107088A
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Abstract
The repairing process mainly consists of repairing and maintaining the crevice, then taking crevice as kernel to heat partially, two kinds of thin welding rod are selected to accomplish double layer welding with the method of suitable small current and scattered and crossed circling spot welding. The adrantages of said invention are capable of operating in a narrow space, high quality of welded seam, not limited by the length of crevice, capable of making the welded seam have good fatigue resistance and reliability by double layer welding, meanwhile the circling spot welding method can make each welded point feature throughly welded, high strength and small stress, thus the welding quality is ensured.
Description
The present invention relates to a kind of cold-welding recovery method of thin wall of cast iron cylinder, be specially adapted to repair the thin-walled water jacket of cast iron cylinder in the loading shovel.
The reparation of thin wall of cast iron cylinder, it is very difficult particularly repairing operation in a fixing small space, the for example loading shovel of the U.S., Germany, Japan's production, its cylinder block generally is fixed on the car body, when the crack appears in its thin-walled water jacket, for example bursting by freezing repairs quite difficulty, and we are the difficult point that example illustrates its reparation with daily output " Mitsubishi's board " 2.5T loading shovel:
1. owing to be subjected to the restriction of body construction condition, cylinder block can not remove welding, can only carry out vertical horizontal position welding under former installment state;
2. because starter is not torn open not got off, use the operating space of repair welding very narrow, cause very difficulty of technological operations such as bevel, arc manipulation, hammering weld seam;
3. because the delivery port position of thin-walled water jacket is higher, during repair welding, water discharging in the water jacket not to the utmost, layer contact water layer, cause the pore on the weld seam very serious, and relax welding stress and mechanically increase the density of weld seam of the method for hammering weld seam is used in the narrow and small inconvenience in operating space, so the watertightness of weld seam is difficult to reach requirement;
Since water jacket wall as thin as a wafer, only 2～2.5 millimeters, the heat conductivility of cast iron is poor during welding, internal stress is big, intensity is lower, and requires that higher processability is arranged, if weld seam is longer, then welding stress increases, and causes weld seam the crack very easily to occur;
5. because the job specification of loading shovel is opened suddenly suddenly and stopped, and cylinder body is in the stress alternation state, weld seam also bears the stress alternation of hydraulic pressure accordingly, load when big, circulating water temperature raises, the corresponding increase of air pressure that the recirculated water gasification is produced, so the final mass of butt welded seam is had relatively high expectations;
6. the hot weld reparation can't be carried out, cold welding can only be carried out.Above-mentioned some condition each other, prerequisite each other, and no matter present restorative procedure adopts that a kind of these six difficult points that all can not solve simultaneously, even repair, also can only be temporary transient, owing to do not tackle the problem at its root, weld seam can split again after a period of time, if the crack seriously then can't repair at all, can only scrap by car load, therefore still do not have good solution at present to finish reparation.
The object of the present invention is to provide a kind of cold-welding recovery method that can overcome the thin wall of cast iron cylinder of above-mentioned difficult point, be specially adapted to the cold welding reparation of the thin-walled water jacket of cast-iron cylinder block in the loading shovel, can guarantee once reparation immediately of crack.
Enforcement of the present invention mainly comprises following main points:
1. finishing crack
Two end points in the crack are stamped foreign dotting punch, developing direction along the crack is respectively bored a stop hole from end points then, stop hole must bore saturating, beating foreign dotting punch again on the line of whole piece crack serves as a mark, with each foreign dotting punch is that the center is drilled to tangent each other a chain of hole, the hole is not bored and the U-shaped groove is milled in each hole, on the orientation of vertical fracture, the one section groove of making a reinforced weld in every interval, method is to be symmetrical in the crack line, several tangent holes are bored on every limit, and the hole is not bored and milled into U type groove;
2. local preheating is a core with the crack, and heating surface area is big as far as possible, and temperature as far as possible evenly preferably is controlled at about 50～60 degree;
3. select two kinds thin footpath welding rods for use, " the drawing the circle dot welding method " of with suitable little electric current, disperseing, intersecting finishes two-layer welding
Groove is reinforced in elder generation's skip welding during the welding ground floor, with the crack line is the center, weld outside to inside by the outer end that reinforces groove symmetrically, central then, a groove in each reinforcing groove is only welded in each striking, after each reinforcing groove all welds, again with the method weld crack groove that disperses skip welding, welding direction is welded to the centre for the reinforcing groove from both sides, the arc manipulation method adopts " drawing punctuates draws " method, and a point is only welded in each striking, and method is: after electric arc ignites, not mobile welding rod, remain on the point, slight draw circle, but current interruption after dropping down out to molten iron, use point towards quick crushing in the slag process black by red stain, the little pockmark of weld seam being got densely covered plastic deformation gets final product.After welding is finished, with electric angle grinder weld seam is milled to cylinder surface and flushes, check to have or not weld defect, then need bore stop hole as finding the crack, and grind groove and reinforce groove, repeat above-mentioned welding process;
After the ground floor welding is finished, on the basis of former layer, weld seam is milled into the U-shaped groove with the reinforcing groove, with " copper base tweezer evanohm welding rod " welding second layer, welding step, method, direction are welded the same with ground floor, after welding is finished, hammer whole welding line into shape stone roller repeatedly to increase the compactness of weld seam, polish weld seam at last.
4. after above process is finished, basically can finish reparation, even there is little gas sky to cause slight seepage, crossing the rust that produces after 1～2 day just seals it naturally, but do not leak fully in order to reach instant reparation, in above-mentioned two-layer welding really on the basis, again with the 3rd layer of " sn-bi alloy solder " soldering, as the overcoat of eliminating seepage.
Fig. 1 stamps foreign dotting punch and stop hole on the crack
Fig. 2 punches on foreign dotting punch
Fig. 3 is trimmed to the U-shaped groove with the hole
Fig. 4 is for making the groove of reinforced weld
Fig. 5 is the concrete steps in the welding process
Repairing with the crack of the thin-walled water jacket of cast iron cylinder in daily output " Mitsubishi's board " 2.5T loading shovel below is that example describes the present invention:
After removing near the cylinder behind dismountable all parts, finding out the crack, carry out following operation,
1. finishing crack
Two end points in the crack are stamped foreign dotting punch, developing direction along the crack lengthens from end points then, and respectively to bore a diameter be 4～5 millimeters stop hole at 5～10 millimeters places, stop hole must bore saturating, beating foreign dotting punch again on the line of whole piece crack serves as a mark, the distance of each foreign dotting punch is preferably 5 millimeters, as shown in Figure 1, with each foreign dotting punch is the center, with diameter is that 5 millimeters handwheel is drilled to a chain of hole, had better not bore, as shown in Figure 2, the U-shaped groove be milled in each hole with alloy rotation file, as shown in Figure 3, with grinding metallic luster around groove both sides and the stop hole, on the orientation of vertical fracture, 25～30 millimeters grooves of making a reinforced weld in every interval, method is to be 5 millimeters drill bit with diameter, be symmetrical in the crack line, two tangent holes, 1.5～2 millimeters of hole depths are bored in every limit, milling into wide with alloy rotation file then is 5.5～6 millimeters, the degree of depth is identical with the crack groove, length is the groove of 10 millimeter, as shown in Figure 4;
2. heating
With this one side that cylinder body need be repaired, comparatively slow and uniform heating to 50～60 degree with oxy-acetylene flame, during heating, oxyfuel gas welding torch can not rest on the position, evenly move, and heat is evenly distributed;
3. welding
Welding is divided into two-layer, ground floor GB " knot 427 " welding rod, with direct current reversed polarity power supply, electric current decides with test weld, unsuitable excessive, also unsuitable too small, be preferably to select for use and mother metal can be melted good minimum current, groove is reinforced in elder generation's skip welding during welding, with the crack line is the center, ecto-entad weldering symmetrically, shown in the vertical arrow of Fig. 5, a point in each reinforcing groove is only welded in each striking, promptly welds A point, B point then earlier, the C point, the D point, be central E point at last, after each reinforcing groove all welded, with the method weld crack groove that disperses skip welding, welding direction was shown in Fig. 5 lateral arrows again, weld to the centre from the reinforcing groove on both sides, promptly weld A ' point, B ' point then earlier, C ' point, D ' point, E ' point, F ' point, arc manipulation method adopt " drawing punctuates draws " method, a point is only welded in each striking, method is: after electric arc ignited, not mobile welding rod remained on the point, slight drawing enclosed, but current interruption after dropping down out to molten iron, in the slag process black by red stain with point towards quick crushing, the little pockmark of weld seam being got densely covered plastic deformation gets final product.After welding is finished, with electric angle grinder weld seam is milled to cylinder surface and flushes, check to have or not weld defect, then need bore stop hole as finding the crack, and grind groove and reinforce groove, repeat above-mentioned welding process;
After the ground floor welding is finished, on the basis of former layer, with alloy rotation file weld seam is milled into the U-shaped groove with the reinforcing groove, with diameter be 2 millimeters " copper base tweezer evanohm welding rod " welding second layer, welding step, method, direction are welded the same with ground floor, after welding is finished, hammer whole welding line into shape stone roller repeatedly to increase the compactness of weld seam, hammer grinds available little riveting gun, clamping conical point and dash, is not normal, strong although this hammer grinds, because copper base tweezer evanohm has preferable performance, it is effectively that therefore this hammer grinds, and polishes weld seam at last.
After above process was finished, repair finished substantially, in order to repair immediately, can use the 3rd layer of " sn-bi alloy welding rod " soldering, and concrete grammar is:
A. clean weld seam, the mixed liquor that can use watery hydrochloric acid and cleanser is as abrasive cleaner, and brush is wiped weld seam repeatedly, with weld seam and peripheral scrub thereof;
B. copper plating bath is coated on the cleaned position, preferably in 10～15 millimeters scopes of weld seam and weld seam periphery, till tangible pale red occurring, here its compound method of used copper plating bath is: hydrochloric acid (chemical pure) 32%, the zinc of adding 4%, after treating all dissolvings, add 20% copper sulphate, add 44% distilled water after stirring again and get final product;
C. at the sn-bi alloy welding rod with plated coated with flux on the position of copper, the compound method of solder flux is: hydrochloric acid (chemical pure) 90%, add zinc 10%, and treat can use after zinc dissolves fully; The preparation of sn-bi alloy welding rod: tin 50%, fusing back adds 50% bismuth in container, casts in the tilted-putted angle bar groove after waiting to melt, and allows it is dirty naturally, be frozen into flat strip shaped can use;
D. with the flatiron heating, coated with flux is spread some sn-bi alloy welding rods, and welding rod fusing back forms coating on flatiron, then the sn-bi alloy welding rod is placed on the position of having plated copper, with the light pressure welding bar of flatiron, gets final product up to welding rod is burn-on equably.This one deck welding is finished, and the crack is once repaired immediately, and come into operation.
The present invention not only is fit to the reparation in the thin-walled water jacket crack of cast iron cylinder in the loading shovel, and is fit to the reparation in any thin wall of cast iron cylinder crack, particularly in narrow and small operating space, still can guarantee repairing quality, and the more thick more good reparation of the wall of cylinder body.
Advantage of the present invention is:
1. restorative procedure provided by the present invention can operate in narrow space;
2. the quality of weld seam is higher, and no matter crack length, casing wall thickness can't not affect repairing quality;
3. the characteristics that adopt dual-layer welding are that the ground floor weldering is suitable because of its specification, arc stability Property is good, firm to the cast iron interlock, easy to operate, have preferably intensity so can guarantee weld seam, and for the little pore rust corrosion on the weld seam seals the good condition of having created naturally, also created advantage for second layer weldering simultaneously, for example played the effect of transition zone, be about to that the second layer is welded on the structure of steel but not on the cast iron mother metal, can make arc stability, molten bath good, weld defect reduces; Second layer weldering can make sealing have very good plasticity and good anti-gas porosity, even abnormal hammering also can be played effect lax welding stress and that make the weld seam densification, simultaneously also can make weld seam have a little good fatigue durability, guarantee the reliability of weld seam under suddenly overload and long-term the use;
4. adopt to draw the welding method of punctuating and can make each solder joint pass through the processes such as striking, preheating, welding, arrangement, tempering, slow cooling, thus have weldering thoroughly, soft, the characteristics such as the heat affected area is little, stress is little of high, the weldering of intensity, mass ratio is more satisfactory;
5. the 3rd layer of sn-bi alloy soldering can improve the reliability of weld seam, because adopted acid copper plating bath before the soldering, displacement reaction by copper, iron, plated the thin and copper layer firmly of one deck at the cast iron mother metal of weld seam and incomplete fusion zone, this copper layer has improved the brazing property of cast iron greatly, the fusing point that adds the sn-bi alloy solder is low, and flowability and permeability are all fine, so not only weld seam compactness is good but also little pore corrosion sealing of acceleration weld seam.
Claims (9)
1, a kind of cold-welding recovery method of thin wall of cast iron cylinder is characterized in that: welding process comprises finishing crack, local preheating, two-layer to draw the welding of circle dot welding method, and concrete operations are as follows
A. repair the crack
Two end points in the crack are stamped foreign dotting punch, developing direction along the crack is respectively bored a stop hole from end points then, stop hole must bore saturating, beating foreign dotting punch again on the line of whole piece crack serves as a mark, with each foreign dotting punch is that the center is drilled to tangent each other a chain of hole, the hole is not bored and the U-shaped groove is milled in each hole, on the orientation of vertical fracture, the one section groove of making a reinforced weld in every interval, method is to be symmetrical in the crack line, tangent several holes is bored on every limit, and the hole is not bored and milled into U type groove;
B. local preheating is a core with the crack, and heating surface area is big as far as possible, and temperature as far as possible evenly preferably is controlled at about 50～60 degree;
C. select two kinds thin footpath welding rods for use, " the drawing the circle dot welding method " of with suitable little electric current, disperseing, intersecting finishes two-layer welding
Groove is reinforced in elder generation's skip welding during the welding ground floor, with the crack line is the center, inwardly weld by the outer end that reinforces groove symmetrically, weldering is central then, each striking is only welded each and is reinforced a groove in groove, after each is reinforced groove and all welds, and weld crack groove again, welding direction is welded to the centre for the reinforcing groove from both sides, the arc manipulation method adopts " drawing punctuates draws " method, and a point is only welded in each striking, and method is: after electric arc ignites, not mobile welding rod, remain on the point, slight draw circle, but current interruption after dropping down out to molten iron, use point towards quick crushing in the slag process black by red stain, the little pockmark of weld seam being got densely covered plastic deformation gets final product
After ground floor welding was finished, with weld seam with reinforce groove and mill into the U-shaped groove, with " copper base tweezer evanohm welding rod " welding second layer, it is the same that welding step, method, direction and ground floor weld, weld finish after, hammer whole welding line into shape stone roller repeatedly, polish weld seam at last.
2, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 1 is characterized in that: stop hole is preferably per 5～10 millimeters apart from the end points in crack.
3, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 1 is characterized in that: the distance of each foreign dotting punch is preferably 5 millimeters, bores thoroughly, and the spacing of reinforcing groove is preferably 25～30 millimeters.
4, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 1 is characterized in that: the welding ground floor is preferably selected GB " knot 427 " welding rod for use, and " copper base tweezer evanohm " welding rod is preferably selected in second layer welding for use.
5, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 1, it is characterized in that: after two-layer welding is finished, the 3rd layer of available sn-bi alloy solder brazing, method is with weld seam and peripheral scrub thereof, copper plating bath is coated on the cleaned position, till tangible pale red occurring, coated with flux then, coated with flux on flatiron, spread some sn-bi alloy welding rods, welding rod fusing back forms coating on flatiron, then the sn-bi alloy welding rod is placed on the position of having plated copper, with the light pressure welding bar of flatiron,, welding rod gets final product up to being burn-on equably.
6, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 5 is characterized in that: the position that copper plating bath was coated with is preferably in 10～15 millimeters scopes of weld seam and weld seam periphery.
7, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 5, it is characterized in that: the proportioning of copper plating bath is that hydrochloric acid (chemical pure) is about 32%, adds about 4% zinc, treat all dissolvings after, add about 20% copper sulphate, add about 44% distilled water after stirring again and get final product.
8, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 5 is characterized in that: the preparation of solder flux is that hydrochloric acid (chemical pure) is about 90%, adds about 10% zinc, treats to get final product after zinc dissolves fully.
9, the cold-welding recovery method of thin wall of cast iron cylinder according to claim 5, it is characterized in that: the preparation of sn-bi alloy welding rod is to get 50% tin, the fusing back adds 50% bismuth in container, cast in after waiting to melt in the tilted-putted angle bar groove, allow it is dirty naturally, be frozen into flat strip shaped gets final product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94104401 CN1038115C (en) | 1994-04-22 | 1994-04-22 | Cold-welding recovery method for thin wall of cast iron cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94104401 CN1038115C (en) | 1994-04-22 | 1994-04-22 | Cold-welding recovery method for thin wall of cast iron cylinder |
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| CN1107088A true CN1107088A (en) | 1995-08-23 |
| CN1038115C CN1038115C (en) | 1998-04-22 |
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| CN 94104401 Expired - Fee Related CN1038115C (en) | 1994-04-22 | 1994-04-22 | Cold-welding recovery method for thin wall of cast iron cylinder |
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Cited By (13)
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| CN100413628C (en) * | 2006-08-22 | 2008-08-27 | 上海人造板机器厂有限公司 | Welding method for large breadth die steel board |
| CN101096974B (en) * | 2006-06-23 | 2010-12-08 | Ihi海洋联合株式会社 | Welding structural body |
| CN102922214A (en) * | 2012-11-29 | 2013-02-13 | 唐山开滦广汇设备制造有限公司 | Technology for repairing surface damages of bores of cylinder parts |
| CN102962646A (en) * | 2012-11-29 | 2013-03-13 | 唐山开滦广汇设备制造有限公司 | Aperture reducing process of deep-hole cylinder tube |
| CN104162762A (en) * | 2014-08-18 | 2014-11-26 | 青岛海之冠汽车配件制造有限公司 | Method for repairing flywheel by using nickel-cobalt-molybdenum-manganese-base alloy |
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| CN109514045A (en) * | 2018-10-29 | 2019-03-26 | 唐宏泉 | A kind of process for welding repair for new-energy automobile water cooling motor housing water jacket |
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| CN111570978A (en) * | 2020-04-01 | 2020-08-25 | 中车青岛四方机车车辆股份有限公司 | Threaded hole thin-wall repair welding method |
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1994
- 1994-04-22 CN CN 94104401 patent/CN1038115C/en not_active Expired - Fee Related
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| CN101096974B (en) * | 2006-06-23 | 2010-12-08 | Ihi海洋联合株式会社 | Welding structural body |
| CN100413628C (en) * | 2006-08-22 | 2008-08-27 | 上海人造板机器厂有限公司 | Welding method for large breadth die steel board |
| CN102922214A (en) * | 2012-11-29 | 2013-02-13 | 唐山开滦广汇设备制造有限公司 | Technology for repairing surface damages of bores of cylinder parts |
| CN102962646A (en) * | 2012-11-29 | 2013-03-13 | 唐山开滦广汇设备制造有限公司 | Aperture reducing process of deep-hole cylinder tube |
| CN102962646B (en) * | 2012-11-29 | 2016-07-06 | 唐山开滦广汇设备制造有限公司 | A kind of aperture reduction process of deep-hole cylinder tube |
| CN104162762A (en) * | 2014-08-18 | 2014-11-26 | 青岛海之冠汽车配件制造有限公司 | Method for repairing flywheel by using nickel-cobalt-molybdenum-manganese-base alloy |
| CN104162761A (en) * | 2014-08-18 | 2014-11-26 | 青岛海之冠汽车配件制造有限公司 | Flywheel crack repair method |
| CN104551448A (en) * | 2015-01-19 | 2015-04-29 | 九龙坡区辉腾机械加工厂 | Novel soldering flux and preparation method thereof |
| CN106914670A (en) * | 2017-01-18 | 2017-07-04 | 新兴能源装备股份有限公司 | A kind of Steel Thin-Wall small opening method for welding |
| CN109514045A (en) * | 2018-10-29 | 2019-03-26 | 唐宏泉 | A kind of process for welding repair for new-energy automobile water cooling motor housing water jacket |
| CN111168207A (en) * | 2020-01-14 | 2020-05-19 | 台州市特种设备检验检测研究院 | Repair welding seam method for stress corrosion cracks of ammonia refrigeration container |
| CN111168207B (en) * | 2020-01-14 | 2021-11-16 | 台州市特种设备检验检测研究院 | Repair welding seam method for stress corrosion cracks of ammonia refrigeration container |
| CN111570978A (en) * | 2020-04-01 | 2020-08-25 | 中车青岛四方机车车辆股份有限公司 | Threaded hole thin-wall repair welding method |
| CN111570978B (en) * | 2020-04-01 | 2021-10-01 | 中车青岛四方机车车辆股份有限公司 | Threaded hole thin-wall repair welding method |
| CN112388245A (en) * | 2020-10-28 | 2021-02-23 | 贵州西能电力建设有限公司 | Welding repair method for broken teeth of large gear of ball mill |
| CN114101848A (en) * | 2021-12-30 | 2022-03-01 | 天津大学 | Welding method for repairing thin-wall cracks of metal component |
| CN114101848B (en) * | 2021-12-30 | 2023-02-28 | 天津大学 | Welding method for repairing thin-wall cracks of metal component |
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| CN1038115C (en) | 1998-04-22 |
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