CN103212771A - TIG/MIG indirect electric arc method for bead welding copper alloy on cast iron valve sealing face - Google Patents
TIG/MIG indirect electric arc method for bead welding copper alloy on cast iron valve sealing face Download PDFInfo
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- CN103212771A CN103212771A CN2013101585003A CN201310158500A CN103212771A CN 103212771 A CN103212771 A CN 103212771A CN 2013101585003 A CN2013101585003 A CN 2013101585003A CN 201310158500 A CN201310158500 A CN 201310158500A CN 103212771 A CN103212771 A CN 103212771A
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Abstract
The invention discloses a TIG/MIG indirect electric arc method for bead welding a copper alloy on a cast iron valve sealing face. Firstly, a valve is preheated, and the sealing face is cleaned. TIG/MIG indirect electric arc technology is utilized, argon is used for protecting the valve from being connected with electricity, and an electric arc is burnt between a tungsten electrode and a welding wire. The TIG/MIG indirect electric arc method for bead welding thee copper alloy on the cast iron valve sealing face has the advantages of being stable in welding process, little in splashing, reliable in weld joint strength, free of defects such as slag inclusion and air vents, capable of saving welding materials, capable of achieving automation, high in efficiency, low in cost, and meanwhile capable of reducing or avoiding the phenomenon of iron flooding due to low dilution rate of base metal.
Description
Technical field
The present invention relates to welding field, more particularly, relate to the process of cast iron butterfly valve surfacing of Cu alloy.
Background technology
Valve is often to use a kind of device in the mechanical industry, requires valve to cooperate with copper workpiece in some occasions, under this condition in order to realize sealing and to increase copper workpiece service life, will be on valve sealing face the built-up welding layer of copper.Domestic small-bore cast iron valve sealing surface copper alloy is deposited at present, and major part all is to adopt the method for manual oxyacetylene torch soldering to carry out, and this method efficient is low, and to the labor claim height, production environment is poor, has wasted a large amount of manpower and materials; The plasma surfacing method also often is applied to the built-up welding of cast iron valve copper alloy, though this method welding quality is good, be mainly used in the welding of larger caliber valve, and the copper alloy powder cost is higher, the equipment complexity, and early investment is more.Simultaneously, because the sweating heat input is very big, the mother metal dilution rate is very high, and general iron phenomenon appears in the copper layer, has increased the copper wear of work loss that cooperates with it.Chinese patent 201210330264.4 proposes to adopt the method for pulse metal argon arc welding to carry out spheroidal graphite cast-iron valve built-up welding stainless steel, and this kind method adopts pulse direct current, argon gas and CO
2Mist as protection gas, last speed of welding is 8～15cm/min, last welding result satisfies mechanical property requirements.But its overlay cladding thickness is 5～6mm, use generally speaking less than thick overlay cladding like this, and speed of welding 8～15cm/min is too slow, and such as being the valve of 100mm for diameter, built-up welding one circle is wanted 2min at the soonest, and efficient is not high.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, by having adopted the welding method of high efficiency automatic TIG/MIG indirect arc, realization automation welding, enhance productivity, save production cost, reduce the mother metal dilution rate simultaneously, promptly reduced general iron degree in the copper layer, thus the copper wear of work loss that reduces to cooperate with it.
Technical purpose of the present invention is achieved by following technical proposals:
A kind of TIG/MIG indirect arc method of cast iron valve sealing surface weld deposit copper alloy, carry out according to following step:
(1) step 1 is put into preheating furnace with valve and is carried out preheating, and the sealing surface of valve cleans out with sand paper, and wherein said valve material is casting pig HT200, and described preheat temperature is 150～300 ℃, is preferably 150-250 ℃; Be 0.5-2h preheating time, is preferably 0.5-1h;
(2) step 2 is fixed on valve on the automatic turntable, connects welding equipment, and the tungsten argon arc welding gun is connected with the argon arc welding machine negative pole, and welding wire connects the argon arc welding machine positive pole by the MIG welding gun, and valve does not connect electricity, so that electric arc burns between tungsten argon arc welding gun and welding wire;
Described welding wire is selected 1.2mm silicon bronze welding wire CuSi3Mn for use; Adopt inert gas to protect, argon gas for example, the throughput of tungsten argon arc welding gun and MIG welding gun is 10-25L/min, preferred 15-20L/min; Welding current is 120-180A, preferred 140-160A; Wire feed rate is 3m/min-12m/min, preferred 5-10m/min; The turntable rotating speed is 1rad/min-6rad/min; Tungsten argon arc welding gun and workpiece planarization angle are 60～80 °, preferred 70-80 °; MIG welding gun and workpiece planarization angle are 60～80 °, preferred 65-75 °; Tungsten argon arc welding gun tip and welding wire termination and valve distance are 0.5-3.0cm, preferred 2-2.5cm;
(3) arcing is welded, and the workpiece of postwelding is put into incubator is incubated, and described holding temperature is 300-400 ℃, and temperature retention time is 1-2 hours.
In technical scheme of the present invention, the method for TIG/MIG indirect arc welding is a kind of high efficiency welding procedure, and this kind technology has reduced the heat input of mother metal, can realize the low dilution rate of mother metal, can improve welding productivity again simultaneously, reduces production costs.Current range 120-180A during welding, when welding current was too small, speed of welding was slow excessively, was unfavorable for enhancing productivity; And electric current though speed of welding improves, causes the mother metal dilution rate excessive when excessive easily, produces general iron phenomenon, cause and arrange and copper workpiece life-span minimizing.Speed of welding (being the platform rotating speed) is 1rad/min-6rad/min, that is: 31.4mm/min～188.4mm/min, and weldering degree of hastening causes overlay cladding blocked up when too low easily, waste material; Weld fast too fast meeting make molten drop be to around sprawl and just solidify, cause the dilution rate increase.The selection of wire feed rate will match with electric current, and wire feed rate is too fast all can to make arc shape change with crossing slowly, thereby influences normally carrying out of welding, and tungsten electrode height most advanced and sophisticated and the welding wire termination also can have influence on dilution rate.Can realize the preparation of different-thickness overlay cladding such as the control of platform rotating speed, welding current by technological parameter.
The present invention can realize automation, thereby enhances productivity, and lowers production cost; It is few to splash in welding process simultaneously, and welding process is stable, and weld strength is reliable; Defectives such as pore-free, crackle, slag inclusion; Compare with TIG weldering under the condition of the same race, MIG weldering, reduce for the heat input of mother metal valve, the dilution rate of mother metal reduces, and the general iron phenomenon of copper layer reduces, and has increased the copper workpiece service life that cooperates with it.
Description of drawings
Fig. 1 is a TIG/MIG indirect arc welding welding equipment connection diagram of the present invention, and wherein 1 is welding machine, and 2 is wire-feed motor,
3 is CO
2Welding gun, 4 is welding turntable, and 5 is cast iron valve, and 6 is the tungsten argon arc welding gun.
Fig. 2 is the material metallograph that utilizes TIG/MIG indirect arc welding postwelding of the present invention, amplifies 100 times (Olympus GX51 microscopes).
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with specific embodiment.
As shown in Figure 1, welding equipment is connected, 1 is WSM315DIGBT contravariant dc pulse tig welding machine, the 2nd specifically, the health of shaking SB-10C-500 wire-feed motor, the 3rd, CO
2Welding gun, the 4th, this BY-50 welding turntable, the 5th of promise, cast iron valve, the 6th, tungsten argon arc welding gun, tungsten electrode connect the argon arc welding machine negative pole, and welding wire connects the argon arc welding machine positive pole by the MIG welding gun, and valve does not connect electricity, and electric arc burns between tungsten electrode and welding wire.
The valve matrix is casting pig HT200, and diameter is 100mm, and seal f ace width is 10mm, and the mass percent % of its chemical composition is as shown in the table:
| The trade mark | C | Si | Mn | P | S | Fe |
| HT200 | 3.0～3.6 | 1.4～2.2 | 0.6～1.0 | <0.15 | <0.12 | Surplus |
Earlier above-mentioned valve is put into preheating furnace and carry out preheating, and the sealing surface to valve is cleaned out with sand paper after preheating.Then valve is placed on the automatic turntable, argon shield is adopted in experiment, the Ar throughput of regulating two welding guns respectively, welding current, turntable rotating speed, wire feed rate, TIG welding gun (tungsten argon arc welding gun) and workpiece planarization angle, MIG welding gun (CO
2Welding gun) with the workpiece planarization angle, TIG welding gun most advanced and sophisticated and welding wire termination and valve distance, concrete welding procedure is as follows:
Last arcing is welded, after finishing, welding just can stay the copper alloy layer of one deck 1-2mm thickness in valve surface, then workpiece being put into incubator is incubated, this is because the thermal coefficient of expansion of copper and iron inconsistent, very easily hold and produce stress, thereby cause crackle, it is as follows specifically to be incubated parameter:
| Embodiment | Holding temperature (℃) | Temperature retention time (h) |
| 1 | 300 | 2 |
| 2 | 320 | 1.4 |
| 3 | 340 | 2 |
| 4 | 350 | 1.6 |
| 5 | 360 | 1.8 |
| 6 | 370 | 1.5 |
| 7 | 380 | 1.4 |
| 8 | 400 | 1 |
Welding wire can be selected 1.2mm silicon bronze welding wire CuSi3Mn for use, and % is as shown in the table for its chemical composition mass percent:
| Alloy number | Al | Fe | Mn | Pb | Si | Sn | Zn | Other elements | Cu |
| CuSi3Mn | <0.01 | <0.5 | <1.5 | <0.02 | 2.8～4.0 | <1.0 | <1.0 | <0.5 | Surplus |
The overlay cladding for preparing is carried out the metallographic processing can find (as shown in Figure 2), have tangible line of demarcation between cast iron matrix and the surfacing of Cu layer, matrix has only a spot of fusing, and does not have the existence of iron in the copper layer substantially, does not have general iron phenomenon to occur.When simultaneously contrasting form and adopt indirect arc welding as can be seen, not only saved production cost, and improved production efficiency greatly for the cost cost of TIG/MIG indirect arc welding and gas welding, as shown in the table:
More than the present invention has been done exemplary description; should be noted that; under the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (6)
1. the TIG/MIG indirect arc method of a cast iron valve sealing surface weld deposit copper alloy is characterized in that, carries out according to following step:
(1) step 1 is put into preheating furnace with valve and is carried out preheating, and the sealing surface of valve cleans out with sand paper, and wherein said valve material is casting pig HT200, and described preheat temperature is 150～300 ℃, and be 0.5-2h preheating time;
(2) step 2 is fixed on valve on the automatic turntable, connects welding equipment, and the tungsten argon arc welding gun is connected with the argon arc welding machine negative pole, and welding wire connects the argon arc welding machine positive pole by the MIG welding gun, and valve does not connect electricity, so that electric arc burns between tungsten argon arc welding gun and welding wire;
Described welding wire is selected 1.2mm silicon bronze welding wire CuSi3Mn for use; Adopt inert gas to protect, the throughput of tungsten argon arc welding gun and MIG welding gun is 10-25L/min; Welding current is 120-180A; Wire feed rate is 3m/min-12m/min; The turntable rotating speed is 1rad/min-6rad/min; Tungsten argon arc welding gun and workpiece planarization angle are 60-80 °; MIG welding gun and workpiece planarization angle are 60～80 ° °; Tungsten argon arc welding gun tip and welding wire termination and valve distance are 0.5-3.0cm;
(3) arcing is welded, and the workpiece of postwelding is put into incubator is incubated, and described holding temperature is 300-400 ℃, and temperature retention time is 1-2 hour.
2. the TIG/MIG indirect arc method of a kind of cast iron valve sealing surface weld deposit copper alloy according to claim 1 is characterized in that, in the described step 1, described preheat temperature is preferably 150-250 ℃; Be preferably 0.5-1h preheating time.
3. the TIGMIG indirect arc method of a kind of cast iron valve sealing surface weld deposit copper alloy according to claim 1 is characterized in that, in the described step 2, adopts argon gas to protect the preferred 15-20L/min of throughput of tungsten argon arc welding gun and MIG welding gun.
4. the TIG/MIG indirect arc method of a kind of cast iron valve sealing surface weld deposit copper alloy according to claim 1 is characterized in that, in the described step 2, and the preferred 140-160A of described welding current.
5. the TIGMIG indirect arc method of a kind of cast iron valve sealing surface weld deposit copper alloy according to claim 1 is characterized in that, in the described step 2, and the preferred 5-10m/min of described wire feed rate.
6. the TIGMIG indirect arc method of a kind of cast iron valve sealing surface weld deposit copper alloy according to claim 1 is characterized in that, in the described step 2, and described tungsten argon arc welding gun and the preferred 70-80 of workpiece planarization angle °; Described MIG welding gun and the preferred 65-75 of workpiece planarization angle °; Described tungsten argon arc welding gun most advanced and sophisticated and welding wire termination and the preferred 2-2.5cm of valve distance.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949750A (en) * | 2014-04-17 | 2014-07-30 | 沈阳大学 | Method for preventing bead welding copper alloy from generating air holes |
| CN103978288A (en) * | 2014-04-30 | 2014-08-13 | 太原理工大学 | Method for welding by TIG (Tungsten Inert Gas arc Welding)-MIG (Metal inert-gas welding) serially connecting way |
| CN104384658A (en) * | 2014-09-11 | 2015-03-04 | 芜湖市金贸流体科技股份有限公司 | Sealing surface machining method of cast steel valve body |
| CN105397251A (en) * | 2015-12-30 | 2016-03-16 | 山东大学 | 3D printing device and method for molten metal |
| CN113523647A (en) * | 2021-07-30 | 2021-10-22 | 浙江工业职业技术学院 | Preparation method and system of copper alloy welding wire and sealing structure |
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| CN101264547A (en) * | 2008-05-07 | 2008-09-17 | 哈尔滨工业大学 | Tungsten electrode-consuming electrode indirect electric arc welding device and its welding method |
| CN102500885A (en) * | 2011-11-09 | 2012-06-20 | 天津大学 | Gas tungsten arc welding (GTAW) system and welding method thereof |
| CN102785004A (en) * | 2012-09-10 | 2012-11-21 | 郑州市郑蝶阀门有限公司 | Process for surfacing stainless steel sealing face on ductile cast iron valve base |
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2013
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949750A (en) * | 2014-04-17 | 2014-07-30 | 沈阳大学 | Method for preventing bead welding copper alloy from generating air holes |
| CN103978288A (en) * | 2014-04-30 | 2014-08-13 | 太原理工大学 | Method for welding by TIG (Tungsten Inert Gas arc Welding)-MIG (Metal inert-gas welding) serially connecting way |
| CN103978288B (en) * | 2014-04-30 | 2016-05-25 | 太原理工大学 | A kind of method of the TIG-MIG welding of connecting |
| CN104384658A (en) * | 2014-09-11 | 2015-03-04 | 芜湖市金贸流体科技股份有限公司 | Sealing surface machining method of cast steel valve body |
| CN104384658B (en) * | 2014-09-11 | 2017-08-08 | 芜湖市金贸流体科技股份有限公司 | A kind of cast steel valve body sealing surface processing method |
| CN105397251A (en) * | 2015-12-30 | 2016-03-16 | 山东大学 | 3D printing device and method for molten metal |
| CN105397251B (en) * | 2015-12-30 | 2018-08-21 | 山东大学 | A kind of molten metal 3D printing device and Method of printing |
| CN113523647A (en) * | 2021-07-30 | 2021-10-22 | 浙江工业职业技术学院 | Preparation method and system of copper alloy welding wire and sealing structure |
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Application publication date: 20130724 |