CN1139608A - Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment - Google Patents
Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment Download PDFInfo
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- CN1139608A CN1139608A CN 95107427 CN95107427A CN1139608A CN 1139608 A CN1139608 A CN 1139608A CN 95107427 CN95107427 CN 95107427 CN 95107427 A CN95107427 A CN 95107427A CN 1139608 A CN1139608 A CN 1139608A
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Abstract
In the steel core and the coating of the covered electrode are added simultaneously the alloy elements which are identical to pearlitic heat resistant cast steel take chromium-molybolenum alloy as main. The steel core also contains Si, Mn, P, S and trace Ti and Ni. In the coating, the cajuelite,Ni and B are compounded, and the ratio of CaO to CaF2 is 0.3-0.7:1. Under the non-preheating and non heat treatment condition, it can be used to repair and weld the crackle of the chromium-molybolenum heat resistant cast steel. The characteristics are superlow hydrogen, high strength, high cracking resistance and high toughness. The comprehensive welding process is good and is adaptive to all position welding.
Description
The present invention relates to welding rod, the present invention relates to the homogeneous electrode that not heat treatment of not preheating of pearlitic heat-resisting cast steel repair welding is used specifically.
Be used for the power station both at home and abroad, the GB150-1998 of departments such as metallurgy and chemical industry and equipment all are to adopt various heat proof materials to make.As the power station heavy castings cylinder made with ZG20CrMoV and main inlet throttle-stop valve valve body thereof etc., these parts defectives such as crackle often occur in the phase under arms, usually adopt two kinds of welding procedures to carry out repair welding at present, the 1st kind is to carry out hot weld with the pearlite type welding material, carry out the preheating more than 250 ℃ before the weldering, postwelding carries out high tempering more than 700 ℃, shortcoming is the repair welding complexity, execution conditions are abominable, long in time limit, the weldment distortion is big, and the job site does not often allow to carry out effective preheating and post weld heat treatment.The 2nd kind is foundry goods not to be needed preheating and cold welding that postwelding is heat-treated with the Austenitic welding material in the device original place, though simplified technology, but the repair welding position is to belong to heterogenous material joint, there is the austenite-ferrite transition region, be easy to generate early stage cracking, the repair welding district can not carry out ultrasonic examination and surperficial magnetic crack detection in addition, and the repair welding material expensive.
The welding rod and the welding procedure thereof of the Patent Office of the People's Republic of China's disclosed patent No. 90110255.5 heat-resisting steel no-preheatings welding usefulness, though simplified technology, its cracking resistance is still undesirable.
The purpose of this invention is to provide a kind of homogeneous electrode that not heat treatment of not preheating of pearlitic heat-resisting cast steel repair welding is used, weld seam has the high strength high cracking resistance, and welding rod has good composite technology, and adapts to all-position welding.
The present invention mainly realizes goal of the invention from following several respects:
As everyone knows, it is very big to the cracking resistance influence that what of hydrogen content in the joint weldering press, and it is one of key factor that causes cold crack, so manufacturing low hydrogen even ultralow hydrogen type electrode, make the hydrogen content of deposited metal low as far as possible, can reach the hydrogen concentration that reduces the brittle zone, heat affected area.In order to obtain the low hydrogen deposited metal, protect alloy transition and processing performance, the present invention is the alkaline low-hydrogen type coating based on calcium carbonate and calcirm-fluoride, compound rutile, nickel and the boron of being added with in coating.When the design coating recipe, consider the complex effects of many compositions, such as striking performance, stability, slag covering performance and take off problems such as fluidity, splashing property, appearance of weld, by adopting orthogonal experimental design method and statistical analysis, determine that the basic composition of coating and contents level are CaO: CaF
2During=0.3～0.7: 1 welding rod, electric arc is soft, and it is minimum to splash, and has satisfied composite technology performance.
For plasticity and the toughness that improves welding point, steel core is with Cr, and the Mo alloy is main, the content of elements such as strict control carbon, sulphur, phosphorus.Except that containing silicon, manganese, phosphorus, sulphur, compound interpolation trace Ti of while and Ni are to guarantee the heat resistance and the toughness of joint.Owing to Ti, N can form TiN again, and TiO, and a large amount of forming core particles can be provided, and is easy to form uniform acicular ferrite, thereby crackle has been expanded inhibition.In addition, because weld metal austenite life period is longer, temperature is lower, and the diffusible hydrogen that also can be beneficial in the welding heat affected zone enters the toughness weld seam, alleviates the hydrogen embrittlement tendency of coarse grain zone, heat affected area.
The alloying mode of weld seam is to adopt to add alloying element simultaneously in steel core and coating, controls carbon by make the steel core strictness with electric arc furnace smelting, sulphur, and constituent contents such as phosphorus obtain pearlite type heat resisting cast steel welding rod, realize the homogeneity welding.
The present invention realizes in the following manner:
A kind of homogeneous electrode that not heat treatment of not preheating of pearlitic heat-resisting cast steel repair welding is used is made of low-carbon steel core and the coating that contains marble, fluorite, ferrosilicon, ferromanganese, ferrotianium, molybdenum-iron, vanadium, chromium, titanium dioxide and soda ash; Make by common alkaline low-hydrogen electrode manufacture method; Contain the alloying element based on chrome molybdenum identical in the steel core of welding rod, the coating simultaneously with pearlitic heat-resisting cast steel, also contain silicon, manganese, phosphorus, sulphur in the steel core, reach micro-titanium, nickel, compound rutile, nickel, the boron of being added with in coating, CaO and CaF in the coating
2Ratio be 0.3～0.7: 1.
The alloy composition of steel core is counted by weight percentage and is carbon≤0.1; Molybdenum 0.3～0.8; Chromium 0.6～1.3; Silicon 0.10～0.37; Manganese 0.5～1.1; Phosphorus≤0.03; All the other are the iron composition titanium, nickel of sulphur≤0.02 and trace, and the coating composition is calculated as by ratio of weight and the number of copies: 30～46 parts in marble; 20～46 parts of fluorites; 3～5 parts of ferrosilicon; 5～7 parts in ferromanganese; 2～4 parts of ferrotianiums; 7～11 parts of rutile; 0.3～1 part of molybdenum-iron; 0.5～1.5 part of chromium; 0.3～0.6 part in nickel; 0.1～0.4 part of boron; 0～0.2 part of vanadium; 1.8～3 parts of titanium dioxides; 0.8～2 part of soda ash.
Good effect of the present invention is:
1. compare with 90110255.5 patents, do not adopt the organic matter carboxymethyl cellulose in the prescription, the dehydrogenation effect is more outstanding, measures deposited metal diffusible hydrogen content≤0.12m1/100g with the glycerine method.Has ultralow hydrogen, high strength, high tenacity, the characteristics of high cracking resistance.
2. owing in steel core and coating, contain the alloying element based on chrome molybdenum identical simultaneously with pearlitic heat-resisting cast steel, the gained seam organization is based on tiny and uniform acicular ferrite, the tough sex organization that adds a small amount of granular bainite, the mechanical property and the mother metal of deposited metal are suitable, have good coupling, can under the not heat treated situation of not preheating, be used for the chrome molybdenum heat resisting cast steel Welding Repair of power station cylinder for example.
3. because control CaO and CaF
2Ratio 0.3～0.7: between 1, welding rod has good composite technology, and electric arc is soft, and it is minimum to splash, and adapts to all-position welding.
4. repair cylinder, valve, porthole geometric ratio with 2～3 times of homogeneous material hot weld method reductions of erection time with welding rod of the present invention, reduce cost 50%, reduce cost about 30% than heterogeneous wlding cold welding method.And repair welding position and mother metal homogeneity are convenient to carry out defect detecting test, guarantee repair quality, improve safety in operation.
The invention provides 7 embodiment, wherein the prescription of embodiment two～enforcement seven row in Table 1.
Be described in further detail below by specific embodiment:
Embodiment one:
The crackle that the cylinder body of making steam turbine with the ZG20CrMoV steel and valve body are occurred, the homogeneous electrode of using with not heat treatment of not preheating of pearlitic heat-resisting cast steel repair welding carries out repair welding, contain the alloying element based on chrome molybdenum identical simultaneously in the steel core of this welding rod and the coating with pearlitic heat-resisting cast steel, also contain silicon, manganese, phosphorus, sulphur in the steel core, reach micro-titanium, nickel, compound rutile, nickel, the boron of being added with in coating.Steel core is selected mild steel for use, also has marble, fluorite, ferrosilicon, ferromanganese, ferrotianium, molybdenum-iron, vanadium, chromium, iron white powder and soda ash, CaO and CaF in the coating in the coating
2Ratio be 0.3～0.7: 1.Make welding rod, make, make adhesive, the welding agent that mixes is coated in around the steel core surface, make the welding rod that the coating outside dimension is respectively φ 4, φ 5, φ 6mm with potassium-sodium water glass by common alkaline low-hydrogen electrode manufacture method.
Embodiment two～embodiment seven, the proportioning components of pressing 6 kinds of steel cores and the coating of embodiment № 2～№ 7 in the table one takes by weighing each composition of steel core and coating respectively;
A. make steel core: with the steel core composition of two kinds of proportionings, smelt according to a conventional method with electric arc furnaces respectively, produce φ 2.5, φ 3.2, and the steel core of φ 4mm is standby;
B. make coating: the coating composition with three kinds of proportionings, mix respectively with conventional method, standby;
C. make welding rod: make with common alkaline low-hydrogen electrode manufacture method, press 6 kinds of proportionings of № 2～№ 7 steel cores and coating in the table one, make adhesive with potassium-sodium water glass, the welding agent that mixes is coated in around the steel core surface, make the welding rod of 6 kinds of proportionings, various electrode coating outside dimensions are φ 4, and φ 5, φ 6mm.
Adopt welding rod of the present invention, 25 ℃ of room temperatures, under the condition of relative humidity 77%, ZG20CrMoV heat resisting steel is carried out soldering test, have bucket-shaped " defective " groove on the test specimen, test result is as follows:
1. above-mentioned test specimen is carried out macro-graph and the equal zero defect of inner ultrasonic examination.
2. the chemical analysis of deposited metal is (counting by weight percentage): carbon 0.03～0.06, silicon 0.2～0.4, manganese 1.2～1.5, chromium 0.7～0.9, molybdenum 0.4～0.6, nickel 0.4～0.6, titanium 0.02～0.04, boron 0.007～0.01, sulphur≤0.008, phosphorus≤0.008.
3. carrying out the deposited metal transformation temperature on hot modeling test machine measures, the result is Ar3=640 ℃, Ar1=440 ℃, illustrate that deposited metal does not produce high temperature transformation in cooling procedure, when phase transformation begins with by being bordering on middle temperature, the weld seam high temperature austenite has enough stability, the generation that helps reducing the hydrogen concentration of brittle zone, the zone of influence and prevent hydrogen-cooled crackle.
4. the deposited metal diffusible hydrogen is measured [H]=0.12ml/100g (glycerine method).
5. deposited metal mechanical performance:
Heat affected area hardness reaches 321～362 (HV);
The weld seam mechanical characteristic: σ b 〉=500MPa,
σs＝343MPa.
ψ＝27％，
σ
5＝10～13％
6. the welding rod with embodiment one～embodiment seven carries out slab repair welding cracking test, the degree of restraining that is subjected to of considering actual repair welding joint is subjected to mother metal thickness, the influence of change in size, the contained condition of maximum when we select cylinder to seek out the cylinder repair welding with this, and the measured test by constraint stress, design the simulation sample, then with welding rod of the present invention test weld on the simulation sample, the anti-crack ability of examination under the harshest situation is the critical thickness of slab that the limit is restrained by testing the approximate 50mm that draws.Is ZG20CrMoV overall size 400mm * 400mm * 60mm with the electric current of 90～100A to mother metal with middle 4mm welding rod, leave the dark V-type groove of 8～10mm on it, flute length 60mm, with normal speed of welding, not preheating before the weldering, the postwelding air cooling is placed the surperficial ultrasonic inspection of carrying out weld seam and nearly seam district after 48 hours, does not find crack-type defect.
Table one: the proportioning components of embodiment two～embodiment seven steel cores and coating
Claims (2)
1. homogeneous electrode that not heat treatment of not preheating of pearlitic heat-resisting cast steel repair welding is used, constitute by low-carbon steel core and the coating that contains marble, fluorite, ferrosilicon, ferromanganese, ferrotianium, molybdenum-iron, vanadium, chromium, titanium dioxide and soda ash, connect the low nitrogen welding rod manufacture method manufacturing of common alkalescence, it is characterized in that containing the alloying element based on chrome molybdenum identical simultaneously in the steel core, coating of welding rod with pearlitic heat-resisting cast steel, also contain silicon, manganese, phosphorus, sulphur in the steel core, reach micro-titanium, nickel, compound rutile, nickel, the boron of being added with in coating, CaO and CaF in the coating
2Ratio be 0.3～0.7: 1.
2. a kind of homogeneous electrode that not heat treatment of not preheating of pearlitic heat-resisting cast steel repair welding is used according to claim 1, the alloy composition that it is characterized in that steel core is counted by weight percentage and is carbon≤0.1; Molybdenum 0.3～0.8; Chromium 0.6～1.3; Silicon 0.10～0.37; Manganese 0.5～1.1; Phosphorus≤0.03; All the other are the iron composition titanium, nickel of sulphur≤0.02 and trace, and the coating composition is calculated as by ratio of weight and the number of copies: 30～46 parts in marble; 20～46 parts of fluorites; 3～5 parts of ferrosilicon; 5～7 parts in ferromanganese; 2～4 parts of ferrotianiums; 7～11 parts of rutile; 0.3～1 part of molybdenum-iron; 0.5～1.5 part of chromium; 0.3～0.6 part in nickel; 0.1～0.4 part of boron; 0～0.2 part of vanadium; 1.8～3 parts of titanium dioxides; 0.8～2 part of soda ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95107427A CN1056548C (en) | 1995-07-06 | 1995-07-06 | Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95107427A CN1056548C (en) | 1995-07-06 | 1995-07-06 | Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment |
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| Publication Number | Publication Date |
|---|---|
| CN1139608A true CN1139608A (en) | 1997-01-08 |
| CN1056548C CN1056548C (en) | 2000-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN95107427A Expired - Fee Related CN1056548C (en) | 1995-07-06 | 1995-07-06 | Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113724C (en) * | 1999-02-04 | 2003-07-09 | 魏国章 | Welding technology for preventing weld crack on refractory pearlitic steel |
| CN101920414A (en) * | 2010-07-23 | 2010-12-22 | 燕山大学 | Special welding electrode for surfacing and repairing broken teeth of cast steel gear |
| CN102500950A (en) * | 2011-10-09 | 2012-06-20 | 四川大西洋焊接材料股份有限公司 | Welding electrode for welding X65-grade pipeline steel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI558492B (en) * | 2011-12-14 | 2016-11-21 | High strength and low temperature resistant TiO 2 Department of CO 2 Gas protection Low hydrogen type flux cored wire |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63242491A (en) * | 1987-03-30 | 1988-10-07 | Nippon Steel Corp | Low hydrogen coated electrode |
| CN1022223C (en) * | 1990-12-29 | 1993-09-29 | 上海锅炉厂 | Welding for heat-resisting steel no-preheating welding |
-
1995
- 1995-07-06 CN CN95107427A patent/CN1056548C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113724C (en) * | 1999-02-04 | 2003-07-09 | 魏国章 | Welding technology for preventing weld crack on refractory pearlitic steel |
| CN101920414A (en) * | 2010-07-23 | 2010-12-22 | 燕山大学 | Special welding electrode for surfacing and repairing broken teeth of cast steel gear |
| CN101920414B (en) * | 2010-07-23 | 2012-08-22 | 燕山大学 | Special welding electrode for surfacing and repairing broken teeth of cast steel gear |
| CN102500950A (en) * | 2011-10-09 | 2012-06-20 | 四川大西洋焊接材料股份有限公司 | Welding electrode for welding X65-grade pipeline steel |
| CN102500950B (en) * | 2011-10-09 | 2014-02-19 | 四川大西洋焊接材料股份有限公司 | Welding electrode for welding X65-grade pipeline steel |
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| CN1056548C (en) | 2000-09-20 |
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