CN102785004A - Process for surfacing stainless steel sealing face on ductile cast iron valve base - Google Patents
Process for surfacing stainless steel sealing face on ductile cast iron valve base Download PDFInfo
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- CN102785004A CN102785004A CN2012103302644A CN201210330264A CN102785004A CN 102785004 A CN102785004 A CN 102785004A CN 2012103302644 A CN2012103302644 A CN 2012103302644A CN 201210330264 A CN201210330264 A CN 201210330264A CN 102785004 A CN102785004 A CN 102785004A
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Abstract
The invention discloses a process for surfacing a stainless steel sealing face on a ductile cast iron valve base. The process includes firstly preheating and cleaning up the valve base; adopting pulse gas metal arc welding; performing full-automatic welding, pulsed direct current, anode reversed connection, and protection through argon and carbon dioxide mixed gas, wherein the flow is 18-25L/min and the welding speed is 8-15cm/min; cladding a stainless steel welding cladding with the thickness of 2.5-6mm at a to-be-welded position of the valve base after the welding; and then placing the valve base at the temperature of 350-400 DEG C for 2 hours. The process has the advantages that the welded sealing face is reliable in strength and stable in performance, and has no defects such as air holes and cracks; the utilization rate of welding materials is high, the process is simple, convenient to operate, and capable of achieving automation; and compared with spinning, boxing and stainless steel ring embedding processes, a plurality of processes such as marking, blanking, plate rolling, butt welding and spinning are omitted, and the process is suitable for automatic welding and batch production.
Description
Technical field
The present invention relates to the processing technology of valve sealing face, especially relate to the technology of built-up welding stainless steel sealing surface on a kind of spheroidal graphite cast-iron valve matrix.
Background technology
The spheroidal graphite cast-iron valve is compared with cast steel valve; Because casting efficient is high, the machined cost is low, corrosion resistance and non-oxidizability are better in the use, and have higher yield strength; Be better than cast steel valve aspect the vibration ability weakening, therefore more welcome at municipal application spheroidal graphite cast-iron valve.At present; The sealing surface of spheroidal graphite cast-iron valve such as butterfly valve, check-valves and ball valve etc. is handled and morely is adopted spinning stainless steel rings, bag weldering stainless steel ring or inlay method such as stainless steel ring; To reach the effect that the spheroidal graphite cast-iron valve has the stainless steel sealing surface; But these processing methods all exist complex process, production cost high at present, and production efficiency is low, defectives such as the not high and quality instability of stock utilization.If adopt directly built-up welding stainless steel sealing surface on matrix of manual electric arc welding or plasma surfacing technology, then can reduce process flow, increase work efficiency; But in actual the use, there is following shortcoming respectively in above-mentioned two kinds of technologies: when adopting manual electric arc welding, solder side is easy to generate defectives such as pore, slag inclusion, crackle; Difficult quality guarantee; The mother metal dilution rate is big during welding, generally want the chemical composition and the mechanical property of three layers of ability assurance of built-up welding overlay cladding, and the utilization rate of wlding is not high.When adopting plasma surfacing, deposition rate is low, occurs defective and repairing difficulties such as crackle, pore during welding easily.
Pulsed gas metal arc welding also is a kind of comparatively common welding method; Easy to operate in its welding process; Do not have slag or slag is seldom arranged, production efficiency is high, but does not see up to now to have this kind welding procedure is applied to the report on the spheroidal graphite cast-iron valve sealing face.
Summary of the invention
The technology of built-up welding stainless steel sealing surface on a kind of spheroidal graphite cast-iron valve matrix that the objective of the invention is to be directed against the deficiency of above-mentioned prior art existence and provide, this technology is simple, production efficiency is high and welding quality stable.
For realizing above-mentioned purpose, the present invention can take following technical proposals:
The technology of built-up welding stainless steel sealing surface on the spheroidal graphite cast-iron valve matrix of the present invention, it comprises the steps:
The first step is carried out preheating with the valve matrix, 100～250 ℃ of preheat temperatures; Position to be welded is cleaned out;
In second step, adopt pulsed gas metal arc welding: welding manner is full-automatic welding, and welding current is a pulse direct current, and anode is reversal connection, and electric current is 120～180A, and protective gas is argon gas and carbon dioxide mix gas, and flow is 18～25L/min; Speed of welding is 8～15cm/min;
In the 3rd step, after welding is accomplished, can coat the stainless steel weld overlays of one deck 2.5-6mm at the position to be welded of valve matrix; There is the valve matrix of stainless steel sealant to place under 350～400 ℃ of temperature insulation to get final product in 2 hours built-up welding then.
The invention has the advantages that the sealing surface of welding has the overlay cladding of metallurgical binding, intensity is reliable; Defective such as pore-free, crackle, stable performance; Do not have in the welding process and splash, the wlding utilization rate is high, and technology is simple, and is easy to operate, can realize automation and batch process, high efficiency.With spinning, bag weldering and inlay stainless steel ring technology and compare, multiple working procedures such as line, blanking, roll bending, butt welding and spinning have been saved; Because sealing surface is the overlay cladding with metallurgical binding, temperature capacity is stronger, and Applicable temperature is wider; Be applied in the actual production, the product first-time qualification rate is more than 96%.Through hot and cold operating life test; Pressure test; Impact test; Fluid blocking-up performance test and end load test etc. prove that the built-up welding sealant can satisfy National Standard GB/T 13927 fully " instructions for use of (pressure test), " GB 2106 " (impact test), mechanical industry standard " JB/T 5296 " (fluid blocking-up performance test), " ASME QME-1QVP-7361.1 " (cold operating life test), " ASME QME-1QVP7362.1 " (hot operating life test) and " ASME QME-1QVP7332.1 " standards such as (end load tests) and industrial and mineral.
The specific embodiment
The technology of built-up welding stainless steel sealing surface on the spheroidal graphite cast-iron valve matrix of the present invention, it comprises the steps:
The first step is carried out preheating, 100～250 ℃ of preheat temperatures with valve matrix (comprising valve body matrix and valve plate matrix); Then position to be welded is cleaned out;
Second step; Adopt pulsed gas metal arc welding: welding manner is full-automatic welding; Welding current is a pulse direct current, and anode is reversal connection, and electric current is 120～180A; Protective gas is argon gas and carbon dioxide mix gas (its volume ratio is Ya Qi ︰ carbon dioxide=93～98%=2～7%), and the flow of mist is 18～25L/min; Speed of welding is 8～15cm/min;
In the 3rd step, after welding is accomplished, can coat the stainless steel weld overlays of one deck 2.5-6mm at the position to be welded (from sealing plane to periphery edge) of valve matrix; There is the valve matrix of stainless steel sealant to place under 350～400 ℃ of temperature insulation to get final product in 2 hours built-up welding then.
Welding wire can select to use the stainless steel solid core welding wire of diameter as φ 1.2mm, like the trades mark such as 304,308,309 and 316.
Pulse DC current scope is 120～180A during welding, can't fuse because electric current is too small, is easy to generate defectives such as lack of penetration, and defectives such as crackle, overlap then appear in electric current excessive layer easily, and moulding is bad.General selection current value is 145A.
Speed of welding scope during welding is 8～15cm/min, and speed of welding is too fast, and the fusion penetration increase increases the layer dilution rate, and the chemical composition of overlay cladding is difficult to guarantee that binder course is prone to crackle; Speed of welding is slow excessively, and layer thickness increases too much, is easy to generate overlap, and the waste wlding.General selection speed of welding is that 11.5 cm/min are more suitable.
Valve after the welding need be incubated at least 2 hours under 350～400 ℃ of temperature.If temperature retention time is too short, comprise that the thermograde of the matrix of overlay cladding fails to reach fully consistent, in cooling procedure, produce stress, micro-crack appears easily; Temperature retention time surpasses 2 hours, can increase production cost again.
Be described in detail in the technology of built-up welding stainless steel sealing surface on the spheroidal graphite cast-iron valve matrix below with two specific embodiments:
Embodiment 1:
The valve matrix is spheroidal graphite cast-iron QT450-10, with pulsed gas metal arc welding built-up welding 308 stainless steel solid core welding wires:
With pulsed gas metal arc welding, joint geometry is the prosposition built-up welding, and gage of wire φ 1.2, layer minimum thickness are 3mm; Single layer welding, minimum preheat temperature are 100 ℃, and protective gas is 97% argon gas+3% carbon dioxide mix gas; Mixed gas flow is 20-22L/min, and electric current is pulse direct current (DC) 145A, and polarity is negative polarity; Mode of metal transfer is a spray transfer, weave bead welding, single-run welding; The ignition tip specification is φ 1.4, and speed of welding is 11-12cm/min, and postwelding is incubated 2 hours under 370 ± 10 ℃ of temperature.
Embodiment 2:
The valve matrix is spheroidal graphite cast-iron QT500-7, with pulsed gas metal arc welding built-up welding SUS 316 stainless steel solid core welding wires:
With pulsed gas metal arc welding, joint geometry is the prosposition built-up welding, and gage of wire is Φ 1.2, and the layer minimum thickness is 5mm; Two layers of weldering, minimum preheat temperature are 150 ℃, and protective gas is 98% argon gas+2% carbon dioxide mix gas; Mixed gas flow is 20-22L/min, and electric current is pulse direct current (DC) 150A, and polarity is negative polarity; Mode of metal transfer is a spray transfer, weave bead welding, single-run welding; The ignition tip specification is Φ 1.4, and speed of welding is 11-12cm/min, and postwelding is incubated 2 hours at least under 400 ± 10 ℃ of temperature.
Claims (2)
1. the technology of built-up welding stainless steel sealing surface on the spheroidal graphite cast-iron valve matrix, it is characterized in that: it comprises the steps:
The first step is carried out preheating with the valve matrix, 100～250 ℃ of preheat temperatures; Position to be welded is cleaned out;
In second step, adopt pulsed gas metal arc welding: welding manner is full-automatic welding, and welding current is a pulse direct current, and anode is reversal connection, and electric current is 120～180A, and protective gas is argon gas and carbon dioxide mix gas, and flow is 18～25L/min; Speed of welding is 8～15cm/min;
In the 3rd step, after welding is accomplished, can coat the stainless steel weld overlays of one deck 2.5-6mm at the position to be welded of valve matrix; There is the valve matrix of stainless steel sealant to place under 350～400 ℃ of temperature insulation to get final product in 2 hours built-up welding then.
2. the technology of built-up welding stainless steel sealing surface on the spheroidal graphite cast-iron valve matrix according to claim 1, it is characterized in that: described valve matrix comprises valve body matrix and valve plate matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103302644A CN102785004A (en) | 2012-09-10 | 2012-09-10 | Process for surfacing stainless steel sealing face on ductile cast iron valve base |
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| CN2012103302644A CN102785004A (en) | 2012-09-10 | 2012-09-10 | Process for surfacing stainless steel sealing face on ductile cast iron valve base |
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| CN102785004A true CN102785004A (en) | 2012-11-21 |
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| CN2012103302644A Pending CN102785004A (en) | 2012-09-10 | 2012-09-10 | Process for surfacing stainless steel sealing face on ductile cast iron valve base |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212771A (en) * | 2013-05-02 | 2013-07-24 | 天津大学 | TIG/MIG indirect electric arc method for bead welding copper alloy on cast iron valve sealing face |
| CN103894709A (en) * | 2014-03-07 | 2014-07-02 | 苏州捷德瑞精密机械有限公司 | Pulsed tungsten argon arc welding method |
| CN104959711A (en) * | 2015-06-15 | 2015-10-07 | 河北恒通阀门有限公司 | Process for overlaying stainless steel sealing face on nodular cast iron valve substrate |
| CN105592966A (en) * | 2013-07-29 | 2016-05-18 | D.G.韦尔德有限责任公司 | Method for coating, with metallic material, bodies made of spheroidal cast iron; back plate for dies for aluminium die casting made with said method |
| CN106077908A (en) * | 2016-06-27 | 2016-11-09 | 国网山东省电力公司淄博供电公司 | A kind of welding method of Centrifugal Casting Iron Pipe part |
| CN110270744A (en) * | 2018-03-13 | 2019-09-24 | 江苏万恒铸业有限公司 | Mechanization gas metal-arc welding valve body connect Welding with valve seat |
| CN111822817A (en) * | 2020-07-21 | 2020-10-27 | 福尼斯(南京)表面工程技术有限公司 | Method for realizing automatic surfacing ball valve by using novel surfacing equipment |
| CN112025224A (en) * | 2020-09-03 | 2020-12-04 | 河北省瑞兆激光机电设备再制造产业技术研究院 | Carbon dioxide automatic cladding remanufacturing method for nodular cast iron bearing cylinder |
| 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 |
| CN113369647A (en) * | 2021-06-02 | 2021-09-10 | 贵州詹阳动力重工有限公司 | Automatic pulse MIG welding method for ultrahigh-strength steel manipulator |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212771A (en) * | 2013-05-02 | 2013-07-24 | 天津大学 | TIG/MIG indirect electric arc method for bead welding copper alloy on cast iron valve sealing face |
| CN105592966A (en) * | 2013-07-29 | 2016-05-18 | D.G.韦尔德有限责任公司 | Method for coating, with metallic material, bodies made of spheroidal cast iron; back plate for dies for aluminium die casting made with said method |
| CN103894709A (en) * | 2014-03-07 | 2014-07-02 | 苏州捷德瑞精密机械有限公司 | Pulsed tungsten argon arc welding method |
| CN104959711A (en) * | 2015-06-15 | 2015-10-07 | 河北恒通阀门有限公司 | Process for overlaying stainless steel sealing face on nodular cast iron valve substrate |
| CN106077908A (en) * | 2016-06-27 | 2016-11-09 | 国网山东省电力公司淄博供电公司 | A kind of welding method of Centrifugal Casting Iron Pipe part |
| CN106077908B (en) * | 2016-06-27 | 2018-05-29 | 国网山东省电力公司淄博供电公司 | A kind of welding method of Centrifugal Casting Iron Pipe part |
| CN110270744A (en) * | 2018-03-13 | 2019-09-24 | 江苏万恒铸业有限公司 | Mechanization gas metal-arc welding valve body connect Welding with valve seat |
| 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 |
| CN111822817A (en) * | 2020-07-21 | 2020-10-27 | 福尼斯(南京)表面工程技术有限公司 | Method for realizing automatic surfacing ball valve by using novel surfacing equipment |
| CN112025224A (en) * | 2020-09-03 | 2020-12-04 | 河北省瑞兆激光机电设备再制造产业技术研究院 | Carbon dioxide automatic cladding remanufacturing method for nodular cast iron bearing cylinder |
| CN112025224B (en) * | 2020-09-03 | 2021-11-19 | 河北省瑞兆激光机电设备再制造产业技术研究院 | Carbon dioxide automatic cladding remanufacturing method for nodular cast iron bearing cylinder |
| CN113369647A (en) * | 2021-06-02 | 2021-09-10 | 贵州詹阳动力重工有限公司 | Automatic pulse MIG welding method for ultrahigh-strength steel manipulator |
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Application publication date: 20121121 |