CN1062684A - The welding rod and the welding procedure thereof of heat-resisting steel no-preheating welding usefulness - Google Patents
The welding rod and the welding procedure thereof of heat-resisting steel no-preheating welding usefulness Download PDFInfo
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Abstract
The invention provides a kind of making welding rods of heat-resisting steel no-preheating welding usefulness and be used for heat-resistant steel welding technology with this welding rod.The deposited metal composition of this welding rod constitutes C≤0.08, Mn0.5-0.8, Si≤0.5, S≤0.035, P≤0.035, Cr0.8-1.2, Mo0.4-0.65 and V0.1-0.25; This welding rod has characteristics such as low, the ultralow hydrogen of hardness, crack resistance are good, high tenacity, versatility, can replace R307, R317, R407 welding rod commonly used at present, is used for the heat-resisting steel no-preheating welding, has advantages such as energy-conservation, efficient, high-quality.
Description
The present invention relates to welding rod and welding procedure, specifically, the present invention relates to the making welding rods of heat-resisting steel no-preheating welding usefulness and be used for heat-resistant steel welding technology with this welding rod.
Along with the develop rapidly of power station, oil, chemical industry and the atomic energy industry requirement to material also improves constantly, requirement equipment can be under high temperature, high pressure long-term stable operation, therefore various heat-resisting alloy steels obtain extensive use, the heat-resisting alloy steel capital such as general 10CrMo910,12CrMoV, 13CrMo44 need be preheating to 200-300 ℃ of welding down, otherwise be easy to generate welding cold cracking, can cause device damage.
Over nearly more than 20 years, Welder author's butt welding of various countries connects cold crack and very payes attention to, and has carried out a large amount of research, and welding cold cracking accounts for more than 90% of weld crack according to statistics.The harm of welding cold cracking is also considerably beyond other weld crack.
In order to prevent and eliminate welding cold cracking, also carried out great deal of experimental, roughly can be divided into the following aspects.
1, development crack-free steel.By reducing the carbon equivalent of steel as far as possible, adopt the more trace elements alloying, improve the purity of steel, improve method such as comprehensive properties of rolled steel by controlled rolling and reduce welding pre-heating temperature or realize pre-thermal weld.
2, improve welding material.Study ultralow hydrogen and the welding material of anti-the moisture absorption, adjust the chemical composition of welding material or the prescription of solder flux and welding rod, optimize the tissue and the performance of weld seam, in the hope of reaching the cold-crack resistance energy that improves weld metal.
3, improve welding procedure.General welding preheating commonly used prevents welding cold cracking, in addition, improves weld heat input in addition, the postheating slow cooling, and postwelding carries out stress relief annealing immediately, optimizes welding procedure, technological measures such as skilful use normalizing pass and postwelding hammering immediately.
At present, the Chang Yong welding cold cracking measure that prevents mainly is the oven dry and the protection against the tide of welding preheating and welding material.The welding preheating helps reducing the hardness of welding and heat affected area, quickens the diffusion and the effusion of hydrogen, can effectively prevent weld crack.But the welding preheating also has weak point, increases the welder and waits between man-hour, is harmful to healthy even inappropriate welding preheating of welder, can increase welding stress greatly, causes crack due to thermal stress.
Press for a kind of shortcoming that can overcome the welding preheating in the production, can prevent welding rod and new process that welding cold cracking produces again.
The present inventor explores by nearly 20 years and has carried out a large amount of weldability tests, tested more than 200 welding rod prescription altogether, through contrast test, filter out making welding rods with excellent anti welding cold cracking performance, it is low that this welding rod has hardness, ultralow hydrogen, crack resistance is good, high tenacity, advantages such as versatility, can be used for the heat-resisting steel no-preheating welding, have energy-conservation, efficiently, advantages such as high quality and low cost, can replace present power station, the R307 that uses always in the chemical industry equipment, R317, the R407 welding rod, can be used for heat-resisting steel no-preheating is welded with to be beneficial to and prevents to produce welding cold cracking, improve welder's working condition and save the energy, simplify welding process management, through producing nearly hundred collection casees, tens thousand of hot heat-resisting alloy steel header pipe joints of having welded on probation, the result is very satisfied, welcome by vast HTHP welder.
At present, though taked many measures that prevent welding cold cracking at carbon manganese steel and low-alloy structural steel, such as: adopt the low-intensity welding material, adopt the welding material of ultralow hydrogen, the anti-moisture absorption and adopt urgent after heat or the postwelding reduction welding pre-heating temperature of annealing immediately, its welding pre-heating temperature can be reduced to 50-100 ℃ by original 100-150 ℃, but can't realize pre-thermal weld.
So, the purpose of this invention is to provide a kind of novelty, ultralow hydrogen welding rod, welding rod of the present invention is lower than similar welding rod deposited metal hydrogen content, hardness is low, toughness is high, cold-crack resistance can be good, and can not preheating welding pearlite heatproof steel.The present invention also provides a kind of usefulness welding rod of the present invention to be used for heat-resistant steel welding technology, and described heat resisting steel need not preheating, can directly weld with this welding rod.
As everyone knows, what of hydrogen content are very big to cracking resistance influence in the welding point, and it is one of key factor that causes delayed crack.Reduce the hydrogen content in the above-mentioned joint, the present invention is by reducing the diffusible hydrogen content of welding material welding rod deposited metal, rationally select the coating raw material for use, reduce the moisture content and the crystallization water content of its material as far as possible, use no or little hydrogeneous constituent, to reach below the standard shape of (mercury process) diffusible hydrogen ml/100g that the deposited metal hydrogen content is controlled at International Standardization Association (ISA) regulation, this is one of important measures that overcome above-mentioned delayed crack.In addition, in the electrode coating of the present invention, the element that adopts some can form stable hydride, it can improve metallurgical dehydrogenation ability in welding process, for example: can suitably improve the ratio of fluorite, with the control weld metal, thereby reduce diffusible hydrogen content.In the welding rod coating recipe, preferably, the ratio of carbonate and fluorite is suitable between 1-2, because the adding of above-mentioned carbonate improves the oxidisability of welding rod, but the deposited metal oxygen content is added, the impact flexibility of butt welded seam is totally unfavorable.The present invention is in welding rod coating recipe for this reason, increases some precedent desoxydation compositions such as ferrotianium ratio; When strengthening precedent desoxydation, the present invention adopts ferrosilicon and the ferromanganese that suitably adds some combined deoxidations in welding rod coating recipe, and it will play precipitation desoxydation, diffusion oxygen effect, promptly can reach the good deoxidation effect of expection.
At last, the impact flexibility of welding rod deposited metal is subjected to the influence of various factors, as: coating raw material, the influence of core wire composition and impurity element.In order to improve welding rod toughness, can in welding rod coating recipe, add some trace elements, with the form that changes field trash distribute, size and purify weld seam, crystal grain thinning, improve the crystalline phase tissue, and reduce the segregation effect, be very favourable to the toughness that improves weld metal.For this reason, suitably improve (as ferrotianium) ratio among the present invention, it not only plays precedent desoxydation and turns usefulness into, and played certain cooperation of oozing and used, because titanium is the element that forms carbide strongly, it when high temperature the more stable and carbide that forms with tiny, disperse be evenly distributed on the matrix, greatly refinement crystal grain, thereby reached toughness and the heat resistance energy that improves the welding rod deposited metal.
For this reason, the present inventor is according to above-mentioned design, and a kind of not making welding rods of pre-thermal weld heat resisting steel is provided, and welding procedure, and it comprises adopts low-carbon (LC), low vanadium, high molybdenum welding material, guaranteeing its intensity and toughness, and reduces the sensitiveness of welding cold cracking.
So the present invention realizes in the following manner:
A kind of welding rod of heat-resisting steel no-preheating welding usefulness, the core wire and the coating that comprise welding rod, it is characterized in that core wire is by the H08A steel, the coating composition comprises calcium carbonate 40-45 part (weight), fluorite 20-25 part (weight), ferroalloy 15-20 part (weight): ferrotianium 10-12 part (weight) wherein, molybdenum-iron 1-3 part (weight), ferromanganese 1-2 part (weight), ferrosilicon 0.5-2 part (weight) and vanadium iron 0.5-1 part (weight), crome metal 3-4 part (weight), soda ash 0.6-1 part (weight) titanium dioxide 3-4 part (weight), quartzy 5-7 part (weight), carboxymethyl cellulose 0.4-1 part (weight), and the sodium silicate of 8-15 part weight is coated in the core wire surrounded surface as binding agent.
It is characterized in that the coating composition comprises marble 42 parts (weight), fluorite 22 parts of (weight), titanium dioxide 4 parts of (weight), quartzy 7 parts of (weight), soda ash 0.6 part of (weight), carboxymethyl cellulose 0.4 part of (weight), crome metal 3 parts of (weight), 20 parts in ferroalloys (weight): ferrotianium 12 parts of (weight), molybdenum-iron 3 parts of (weight), ferromanganese 2 parts of (weight), ferrosilicon 2 parts of (weight) and 1 part of vanadium iron (weight) wherein, and the sodium silicate of 10 parts of weight is coated in the core wire surrounded surface as binding agent.
When it is characterized in that described core wire is respectively φ 3.2, φ 4 and φ 5mm, the coating outside dimension is respectively φ 5.2-5.3, φ 6.2-6.3 and φ 7.3-7.4mm.
It is characterized in that the deposited metal chemical analysis is respectively the welding rod of C≤0.08, Mn0.5-0.8, Si≤0.5, S≤0.035, P≤0.035, Cr0.8-1.2, Mo0.4-0.65 and V0.1-0.25.
It is characterized in that described heat-resistant steel welding need not preheating procedure.
Below, the present invention will be described in further detail by specific embodiment, so that advantage of the present invention is more obvious.
Embodiment (following all represent) with parts by weight and percetage by weight
1. core wire: adopt the mild steel of C≤0.08, preferentially adopt the H08A steel
2. weld the skin constituent:
Calcium carbonate 40-45 part is preferentially adopted 42 parts in marble;
Fluorite 20-25 part is preferentially adopted 22 parts;
Crome metal 3-4 part is preferentially adopted 3 parts;
Carboxymethyl cellulose 0.4-1 part preferentially, is adopted 0.4 part;
Soda ash (Na
2Co
3) 0.6-1 part, preferentially adopt 0.6 part;
Titanium dioxide 3-4 part is preferentially adopted 4 parts;
Quartzy 5-7 part preferentially, is adopted 7 parts;
Ferroalloy 15-20 part preferentially, is adopted 20 parts
Comprise: ferrotianium 10-12 part, preferentially adopt 12 parts;
Molybdenum-iron 1-3 part preferentially, is adopted 3 parts;
Ferromanganese 1-2 part is preferentially adopted 2 parts;
Ferrosilicon 0.5-1 part is preferentially adopted 2 parts; And
Vanadium iron 0.5-1 part is preferentially adopted 1 part; With
Sodium silicate 8-15 part preferentially, is adopted 10 parts as binding agent.
After above-mentioned composition mixed, by common alkaline low-hydrogen welding electrode manufacture method, be coated in around the above-mentioned core wire surface, described core wire is respectively φ 3.2, φ 4 and φ 5mm, and the coating outside dimension is respectively φ 5.2-5.3, φ 6.2-6.3 and φ 7.3-7.4mm.
Application Example
In order to guarantee the weldering physique amount after the Cr-Mo heat-resistant steel welding, common Cr-Mo heat-resistant steel welding preheat temperature is as shown in table 1 below:
Table 1
Material 15CrMo 12CrMoV 13CrMo44 10CrMo910 9CrMo F12
Preheating
150-250 150-250 200-300 200-300 300-400 400-500
Temperature ℃
Adopt welding rod of the present invention, above-mentioned Cr-Mo heat resisting steel is carried out soldering test, by the standard processing sample of oblique Y type bevel for welding shape and size, test is welded at ambient temperature, and its result is as follows:
1. the chemical composition of deposited metal:
C≤0.08, Mn0.5-0.8 Si≤0.5, S≤0.035, P≤0.035, Cr0.8-1.2, Mo0.4-0.65 and V0.1-0.25.
2. the mechanical performance of deposited metal:
b≥540MPa、s≥440MPa、δ≥17%
3. the impact flexibility of normal temperature weld metal:
Summer is than (v-notch) impact absorbing energy 〉=1005
4. weldability test:
By oblique Y groove welding crack test method, at room temperature soldered flawless.
5. welding hardness:
As-welded weld hardness HV
10≤ 300
6. deposited metal diffusible hydrogen content≤2ml/100g(glycerine method)
7. with reverse lock test method and oblique Y cracking test method, do not find reheat crack(ing).
Therefore, adopt welding rod of the present invention to can be used for the heat-resisting steel no-preheating welding, help preventing to produce welding cold cracking and reheat crack(ing), improve Welding Structure and toughness and structural safety reliability.
Claims (7)
1, a kind of welding rod of heat-resisting steel no-preheating welding usefulness, the core wire and the coating that comprise welding rod, it is characterized in that core wire is made of the H08A steel, the coating composition comprises calcium carbonate 40-45 part (weight), fluorite 20-25 part (weight), ferroalloy 15-20 part (weight): wherein ferrotianium 10-12 part (weight), molybdenum-iron 1-3 part (weight), ferromanganese 1-2 part (weight), ferrosilicon 0.5-2 part (weight) and vanadium iron 0.5-1 part (weight); Crome metal 3-4 part (weight), soda ash 0.6-1 part (weight) titanium dioxide 3-4 part (weight), quartzy 5-7 part (weight), carboxymethyl cellulose 0.4-1 part (weight), and the sodium silicate of 8-15 part weight is coated in the core wire surrounded surface as binding agent.
2, welding rod as claimed in claim 1, it is characterized in that the coating composition comprises marble 42 parts (weight), fluorite 22 parts of (weight), titanium dioxide 4 parts of (weight), quartzy 7 parts of (weight), soda ash 0.6 part of (weight), carboxymethyl cellulose 0.4 part of (weight), crome metal 3 parts of (weight), 20 parts in ferroalloys (weight): ferrotianium 12 parts of (weight), molybdenum-iron 3 parts of (weight), ferromanganese 2 parts of (weight), ferrosilicon 2 parts of (weight) and 1 part of vanadium iron (weight) wherein, and the sodium silicate of 10 parts of weight is coated in the core wire surrounded surface as binding agent.
3, welding rod as claimed in claim 1 or 2, when it is characterized in that described core wire is respectively φ 3.2, φ 4 and φ 5mm, the coating outside dimension is respectively φ 5.2-5.3, φ 6.2-6.3 and φ 7.3-7.4mm.
4, welding rod as claimed in claim 3 is characterized in that the deposited metal chemical analysis is the welding rod of C≤0.08, Mn0.5-0.8, Si≤0.5, S≤0.035, P≤0.035, Cr0.8-1.2, Mo0.4-0.65 and V0.1-0.25.
5, welding rod as claimed in claim 1 is used for heat-resistant steel welding, it is characterized in that described heat resisting steel need not preheating and welds.
6, welding rod as claimed in claim 2 is used for heat-resistant steel welding, it is characterized in that described heat resisting steel need not preheating and welds.
7, welding rod as claimed in claim 3 is used for heat-resistant steel welding, it is characterized in that described heat resisting steel need not preheating and welds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90110255 CN1022223C (en) | 1990-12-29 | 1990-12-29 | Welding for heat-resisting steel no-preheating welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90110255 CN1022223C (en) | 1990-12-29 | 1990-12-29 | Welding for heat-resisting steel no-preheating welding |
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| Publication Number | Publication Date |
|---|---|
| CN1062684A true CN1062684A (en) | 1992-07-15 |
| CN1022223C CN1022223C (en) | 1993-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90110255 Expired - Fee Related CN1022223C (en) | 1990-12-29 | 1990-12-29 | Welding for heat-resisting steel no-preheating welding |
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| Country | Link |
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| CN (1) | CN1022223C (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056548C (en) * | 1995-07-06 | 2000-09-20 | 河北省电力试验研究所 | Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment |
| CN102407413A (en) * | 2010-09-26 | 2012-04-11 | 上海市紧固件和焊接材料技术研究所 | Surfacing welding electrode for sealing face of valve |
| CN102528310A (en) * | 2010-12-28 | 2012-07-04 | 昆山京群焊材科技有限公司 | Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode |
| CN104014949A (en) * | 2014-05-30 | 2014-09-03 | 洛阳双瑞特种合金材料有限公司 | High-toughness alloy system heat-resistant steel electrode |
| CN104014916A (en) * | 2014-06-06 | 2014-09-03 | 南通国电电站阀门有限公司 | F91 valve body and 10CrMo910 tubing dissimilar steel welding method |
| CN105108373A (en) * | 2015-06-09 | 2015-12-02 | 中广核工程有限公司 | Special welding rod for on-site welding main steam pipe in nuclear power station |
| CN105252161A (en) * | 2015-11-20 | 2016-01-20 | 四川大西洋焊接材料股份有限公司 | Special heat-resistant steel electrode suitable for 550 DEG C high-temperature work equipment pieces and preparation method thereof |
| CN106216884A (en) * | 2016-07-29 | 2016-12-14 | 安徽飞弧焊业股份有限公司 | A kind of Stability Analysis of Structures is without copper facing coating welding wire |
| CN106271172A (en) * | 2016-08-13 | 2017-01-04 | 江苏标新工业有限公司 | The method controlling fire check for the welding of heat resisting steel furnace roller |
| CN107088719A (en) * | 2017-03-09 | 2017-08-25 | 洛阳双瑞特种合金材料有限公司 | One kind can post weld heat treatment low-alloy steel electrode |
| CN109226996A (en) * | 2018-11-19 | 2019-01-18 | 重庆延祥轨道交通设备有限责任公司 | A kind of Austria's shellfish body steel track switch soldering welding rod and preparation method thereof |
| CN109262164A (en) * | 2018-11-19 | 2019-01-25 | 重庆延祥轨道交通设备有限责任公司 | A kind of bainitic steel track switch soldering welding rod and preparation method thereof |
| CN113245748A (en) * | 2021-07-05 | 2021-08-13 | 四川西冶新材料股份有限公司 | 14Cr1MoR matched high-toughness welding electrode for hydrogen-contacting steel |
-
1990
- 1990-12-29 CN CN 90110255 patent/CN1022223C/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056548C (en) * | 1995-07-06 | 2000-09-20 | 河北省电力试验研究所 | Same quality welding bar for repair welding of pearlitic heat-resisting cast steel without pre-heating and heat treatment |
| CN102407413A (en) * | 2010-09-26 | 2012-04-11 | 上海市紧固件和焊接材料技术研究所 | Surfacing welding electrode for sealing face of valve |
| CN102407413B (en) * | 2010-09-26 | 2013-07-31 | 上海市紧固件和焊接材料技术研究所 | Surfacing welding electrode for sealing face of valve |
| CN102528310A (en) * | 2010-12-28 | 2012-07-04 | 昆山京群焊材科技有限公司 | Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode |
| CN104014949A (en) * | 2014-05-30 | 2014-09-03 | 洛阳双瑞特种合金材料有限公司 | High-toughness alloy system heat-resistant steel electrode |
| CN104014916B (en) * | 2014-06-06 | 2016-08-17 | 南通国电电站阀门有限公司 | F91 valve body and 10CrMo910 pipe arrangement different steel weld method |
| CN104014916A (en) * | 2014-06-06 | 2014-09-03 | 南通国电电站阀门有限公司 | F91 valve body and 10CrMo910 tubing dissimilar steel welding method |
| CN105108373A (en) * | 2015-06-09 | 2015-12-02 | 中广核工程有限公司 | Special welding rod for on-site welding main steam pipe in nuclear power station |
| CN105108373B (en) * | 2015-06-09 | 2017-12-29 | 中广核工程有限公司 | Nuclear power station main steam line Site Welding welding rod special for special |
| CN105252161A (en) * | 2015-11-20 | 2016-01-20 | 四川大西洋焊接材料股份有限公司 | Special heat-resistant steel electrode suitable for 550 DEG C high-temperature work equipment pieces and preparation method thereof |
| CN106216884A (en) * | 2016-07-29 | 2016-12-14 | 安徽飞弧焊业股份有限公司 | A kind of Stability Analysis of Structures is without copper facing coating welding wire |
| CN106271172A (en) * | 2016-08-13 | 2017-01-04 | 江苏标新工业有限公司 | The method controlling fire check for the welding of heat resisting steel furnace roller |
| CN107088719A (en) * | 2017-03-09 | 2017-08-25 | 洛阳双瑞特种合金材料有限公司 | One kind can post weld heat treatment low-alloy steel electrode |
| CN107088719B (en) * | 2017-03-09 | 2019-04-09 | 洛阳双瑞特种合金材料有限公司 | One kind can post weld heat treatment low-alloy steel electrode |
| CN109226996A (en) * | 2018-11-19 | 2019-01-18 | 重庆延祥轨道交通设备有限责任公司 | A kind of Austria's shellfish body steel track switch soldering welding rod and preparation method thereof |
| CN109262164A (en) * | 2018-11-19 | 2019-01-25 | 重庆延祥轨道交通设备有限责任公司 | A kind of bainitic steel track switch soldering welding rod and preparation method thereof |
| CN113245748A (en) * | 2021-07-05 | 2021-08-13 | 四川西冶新材料股份有限公司 | 14Cr1MoR matched high-toughness welding electrode for hydrogen-contacting steel |
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| Publication number | Publication date |
|---|---|
| CN1022223C (en) | 1993-09-29 |
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