CN104400195A - Tungsten electrode gas shielded welding method and application thereof - Google Patents
Tungsten electrode gas shielded welding method and application thereof Download PDFInfo
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- CN104400195A CN104400195A CN201410603354.5A CN201410603354A CN104400195A CN 104400195 A CN104400195 A CN 104400195A CN 201410603354 A CN201410603354 A CN 201410603354A CN 104400195 A CN104400195 A CN 104400195A
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- welding
- wlding
- base metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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Abstract
The invention relates to a tungsten electrode gas shielded welding method and an application thereof, and can be applied to the welding of a carbon steel workpiece. During welding, a tungsten electrode is used as electrode melting base metal and is welded in a way that welding materials are heated by a molten pool; after a welding machine carries out arcing and preheating, the base metal is firstly molten, and a liquid molten pool is formed by the base metal within certain craft time; the welding materials are firstly preheated on a position far away from the molten pool for a certain distance, then the welding materials gradually approach to the molten pool to finally melt the welding materials, and therefore, welding lines form a mutual melting state of base metal ingredients and welding material ingredients in solidification, problems of incomplete welding material melting caused by unstable arc voltage in a tungsten electrode arc striking process and welding splashing can be avoided, a stable welding form achieves a welding penetration requirement, and in addition, the welding line is full and forms surface tension so as to increase welding intensity.
Description
Technical field
The present invention relates to welding field, and connect method and application in particular to a kind of gas tungstun arc welding.
Background technology
At welding field, the welding manner of carbon steel work-piece is a lot, welding procedure is also very ripe, but it is higher for some welding work pieces surface quality requirements, especially require higher to the cleannes of welded workpiece and be difficult to the welding product carrying out follow-up cleaning, welding practise area be all adopt soldering, common gas tungstun arc welding welds, but the equal Shortcomings of the processing mode of this series products in production practices, such as adopt soldering processes, although surface cleanness Resolving probiems, but its production cost is because adopt the electric power of high price welding wire and at substantial and oil gas to cause production cost to remain high.Although adopt common gas tungstun arc welding can overcome the high problem of production cost; but there is very great fluctuation process because the heat of tungsten electrode striking conduction carries out wire melting in the welding process of carbon steel work-piece; this for workpiece welding quality be fatal; if the excessive heat of electric current rises, cause steel part to burn with oxidative phenomena after causing workpiece burning serious, weld penetration reduction can be caused again directly to affect weld strength if the too small heat of electric current reduces.
Simultaneously, a kind of tubular part welding method and application is disclosed in Chinese patent application 201410172565.8, argon arc welding feeding method described in this patent is exactly adopt common argon arc welding technique, its original text word is " iron-based welding wire 8 is sent in weld seam 9 position that the wire feeder of welding machine is constantly aimed to welding gun simultaneously; welding wire 8 arrives 2 and central authorities of electric arc by whole hot melt ", this welding method adopts tungsten electrode arc heat to carry out filler wire exactly, but finds that the method cannot ensure welding quality through experiment.
Summary of the invention
The object of the present invention is to provide a kind of gas tungstun arc welding to connect method and application, effectively can improve welding quality.
To achieve these goals, embodiments provide a kind of gas tungstun arc welding and connect method, comprising:
During welding, tungsten electrode is as electrode with molten solder mother metal, forms liquid state molten pool at the pad of welding base metal;
Utilize liquid state molten pool to heat wlding to weld.
Optionally, the fusing mode of wlding is not that the heat produced by electrode arc striking is melted, but utilizes the liquid state molten pool formed to melt wlding.
Optionally, heat welding base metal, within certain process time, make welding base metal form liquid state molten pool, wlding, progressively close to molten bath, finally makes wlding melt.
Optionally, the distance of wlding distance tungsten electrode central point is at more than 3mm, and wlding distance position, molten bath is between 0.5-50mm scope.
Optionally, content≤0.2% of carbon in described wlding composition, the content of manganese between 0.7%-2.5%, between the content 0.4%-1.5% of silicon.
Optionally, weld seam internal component is formed by welding base metal composition and the congruent melting of wlding composition.
Optionally, during welding the angle of tungsten electrode axial line and welding work pieces axis line between 15 °-85 °.
Optionally, during welding the angle of axis of workpiece line and horizontal plane between 2 °-178 °.
Optionally, described welding method is applied to the welding of carbon steel work-piece.
The embodiment of the present invention additionally provides described gas tungstun arc welding and connects method and be applied to liquid receiver for compressor, noise reducer for air conditioner, central air-conditioning gas-liquid separator or gs-oil separator; the blast pipe of compressor, air suction inner pipe, air suction outer tube, reservoir air inlet pipe or reservoir escape pipe, the welding of the pipe arrangement of air-conditioner, tube connector, reversal valve pipe or expansion valve pipe.
Compared with prior art, the present invention has the following advantages:
During welding, tungsten electrode is as electrode with molten solder mother metal, forms liquid state molten pool at the pad of welding base metal; Utilize liquid state molten pool to heat wlding to weld, wlding and welding base metal can be melted completely mutually, heat to separate carry out owing to adding wlding and tungsten electrode striking, to avoid in this process in tungsten electrode arc process because the existence of wlding, tungsten electrode surface adhesion foreign material and cause arc voltage unstable, thus cause the half-cooked problem of wire melting to also avoid spatter problem; Simultaneously welding form stable so not only reaches welding penetration and to require but also weld seam is full can form surface tension, and its surface shape of weld is protruding non-linear arc-shaped but not flat, can increase weld strength; And owing to being utilize molten bath to carry out heat fused to wlding, now welding base metal fully melts, the problem causing welding base metal and wlding molten inadequate mutually can not be produced.
Accompanying drawing explanation
Figure 1 shows that gas tungstun arc welding of the present invention meets the production principle figure of method;
Fig. 2 and Figure 3 shows that the cross-sectional view of weld locations of the embodiment of the present invention;
Figure 4 shows that the cross-sectional view of the welding position of the embodiment of the present invention;
The gas tungstun arc welding that Fig. 5 is respectively the embodiment of the present invention to be provided meets the production principle figure that method is applied to reservoir;
The gas tungstun arc welding that Fig. 6 is respectively the embodiment of the present invention to be provided meets the production principle figure that method is applied to gas-liquid separator;
The gas tungstun arc welding that Fig. 7 is respectively the embodiment of the present invention to be provided meets the production principle figure that method is applied to two plate welding.
Detailed description of the invention
Inventor finds, why adopt the welding effect of prior art not good, mainly because there is very great fluctuation process because the heat of tungsten electrode striking conduction carries out wire melting in the welding process of carbon steel work-piece, this for workpiece welding quality impact greatly, if the excessive heat of electric current rises, cause steel part to burn with oxidative phenomena after causing workpiece burning serious, weld penetration reduction can be caused again directly to affect weld strength if the too small heat of electric current reduces.Simultaneously owing to adopting the heat of tungsten electrode striking conduction to carry out filler wire, wire melting is fast, and now the welding parent of correspondence position may not melt or not melt completely, and welding parent and welding wire can not be merged completely, and welding effect is poor.The electric arc simultaneously produced due to tungsten electrode is guided on workpiece and welding wire simultaneously, can produce arc voltage shakiness, causes that wire melting is half-cooked, spatter.
For this reason, the embodiment of the present invention proposes a kind of gas tungstun arc welding and connects method and application, and by first forming liquid state molten pool, utilize the liquid state molten pool fusing wlding of high temperature, wlding and welding base metal can be melted completely mutually, and welding effect is good.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
Described gas tungstun arc welding connects the welding that method can be applied to any metal works; it can be the welding of two workpiece of same metal; also the welding of two workpiece of different metal can be applied to; in embodiments of the present invention; adopt the example that is welded as of carbon steel work-piece to be described, but protection scope of the present invention is not limited thereto.Simultaneously; the pad of welding base metal is being heated; can adopt that arc welding, plasma weldering etc. are any suitable to be connect method butt welding contact in gas tungstun arc welding and heat; in embodiments of the present invention; with shielded arc welding of tungsten electrode gas, heat fused is carried out to welding base metal; form liquid state molten pool, but protection scope of the present invention is not limited thereto.
Embodiment one
As shown in Figure 1 to 4, in the present embodiment, the port of two workpiece to be welded is socketed mutually, and wherein the outer wall of a part and the inwall of another part overlap, and the place socket-connected is welded as the weld seam 12 of welding base metal 11.In the present embodiment, the junction to be welded of the port of two workpiece is all iron-based face.Welding procedure adopts shielded arc welding of tungsten electrode gas to weld; described shielded arc welding of tungsten electrode gas can adopt existing welding machine to heat welding base metal; described welding machine comprises tungsten electrode 15 and is enclosed within the gas nozzle 17 around tungsten electrode; tungsten electrode 15 is utilized to produce electric arc 18; described electric arc 18 pairs of welding base metals 11 are utilized to heat; in gas nozzle 17, spray protective gas 17, as carbon dioxide or argon gas etc., protection pad is to avoid pad oxidized simultaneously.
After welding gun preheating by arc striking, first utilize electric arc to be melted by the pad of welding base metal, within certain process time, (according to product thickness situation, the process time is between 0.1 second-5 seconds) welding base metal forms liquid state molten pool.Due to the now wlding first preheating in the certain limit of distance molten bath in metal liquid molten bath, general in the scope of 50mm, then progressively close to molten bath, final distance position, molten bath is between 0.5-50mm scope, wlding is melted, thus weld seam 12 forms the state of dissolving each other of welding base metal composition and wlding composition in solidification, last ectonexine metal realizes congruent melting with wlding three and welds.
In the present embodiment, described wlding is iron-based welding wire, content≤0.2% of carbon in described wlding composition, the content of manganese is between 0.7%-2.5%, between the content 0.4%-1.5% of silicon, when wlding is near metal liquid molten bath, wlding melts by the high temperature in metal liquid molten bath, liquid wlding drops onto in metal liquid molten bath, and two compositions can be dissolved each other completely.Simultaneously, in order to make liquid solder and mother metal smooth flow and combination, improve speed of welding, an angle is had between the tungsten electrode axial line of welding gun and welding work pieces axial line during welding, this angle c is between 15 °-85 °, have an angle between workpiece axial line and horizontal plane during welding, this angle beta scope is between 2 °-178 °.
Separate due to the process sending the process of wlding and tungsten electrode striking to heat and carry out, to avoid in this process in tungsten electrode arc process because the existence of wlding, tungsten electrode surface adhesion foreign material and cause arc voltage unstable, thus cause the half-cooked problem of wire melting to also avoid spatter problem; Simultaneously welding form stable so not only reaches welding penetration and to require but also weld seam is full can form surface tension, and its surface shape of weld is protruding non-linear arc-shaped but not flat (please refer to Fig. 3), can increase weld strength; And owing to being utilize molten bath to carry out heat fused to wlding, now welding base metal fully melts, the problem causing welding base metal and wlding molten inadequate mutually can not be produced.
Embodiment two
As shown in Figure 5, the present embodiment is the housing of reservoir, in can-like, comprise two-part or syllogic, two-part is that the upper shell with upper end cover and the lower shell socket with bottom end cover are welded, and syllogic is the cylindrical shell of hollow and is combined in the upper end cover at cylindrical shell two ends and bottom end cover three part respectively and is socketed between two and is welded.Each several part to be welded is iron material matter (namely junction to be welded is all iron-based face), wherein the port bore of bottom end cover is greater than the lower port bore of cylindrical shell, the upper port bore of cylindrical shell is greater than the port bore of upper end cover, and the thickness of the port of each several part is identical or different.Before welding, be fixedly installed on fixture after two parts cover to be welded connects, without the need to pre-fill solder in advance between solder side.
During welding, adopt the welding gun of argon arc welding, angle between the tungsten electrode axial line of welding gun and housing axial line is 30 °-60 °, angle between housing axial line and horizontal plane is between 45 °-85 °, after welding gun power initiation after tungsten electrode electrode discharge preheating by arc striking, first be that mother metal is melted, (according to product thickness situation within certain process time, process time is between 0.1 second-5 seconds) make mother metal form liquid state molten pool, welding wire is preheating in the certain limit of distance molten bath first, then progressively close to molten bath, wlding is finally made to melt, last ectonexine metal realizes congruent melting with welding wire three and welds.
In the present embodiment, can by rotating reservoir, the position of fixing welding gun and wlding, realizes circular seam welding.In other embodiments, also can fix reservoir, by the position of mobile welding gun and wlding, realize circular seam welding.
Embodiment three
As shown in Figure 6, the present embodiment is the housing of gas-liquid separator, in can-like, comprise two-part or syllogic, two-part is that the upper shell with upper end cover and the lower shell socket with bottom end cover are welded, and syllogic is the cylindrical shell of hollow and is combined in the upper end cover at cylindrical shell two ends and bottom end cover three part respectively and is socketed between two and is welded.Each several part to be welded is iron material matter (namely junction to be welded is all iron-based face), wherein the port bore of bottom end cover is greater than the lower port bore of cylindrical shell, the upper port bore of cylindrical shell is less than the port bore of upper end cover, and the thickness of the port of each several part is identical or different.Before welding, be fixedly installed on fixture after two parts cover to be welded connects, without the need to pre-fill solder in advance between solder side.
The present embodiment adopts argon arc welding, angle between the tungsten electrode axial line of welding gun and housing axial line is 30 °-60 °, angle between housing axial line and horizontal plane is between 45 °-85 °, after welding machine electric power starts after tungsten electrode electrode discharge preheating by arc striking, first be that mother metal is melted, (according to product thickness situation within certain process time, process time is between 0.1 second-5 seconds) make mother metal form liquid state molten pool, welding wire is preheating in the certain limit of distance molten bath first, then progressively close to molten bath, wlding is finally made to melt.Last ectonexine metal realizes congruent melting with welding wire three and welds.
Embodiment four
As shown in Figure 7, the present embodiment is two plate welding, and two pieces of flat boards are combined closely, and docking is between two welded.Each several part to be welded is iron material matter (namely junction to be welded is all iron-based face), and the thickness of the port of each several part is identical or different.Before welding, be fixedly installed on fixture after two parts cover to be welded connects, without the need to pre-fill solder in advance between solder side, dull and stereotypedly to move according to welding direction equidirectional with certain speed, welding gun and wire feeder maintain static and weld.
The present embodiment adopts argon arc welding, angle of inclination between the tungsten electrode axial line of welding gun and workpiece planarization is 30 °-60 °, after welding machine electric power starts after tungsten electrode electrode discharge preheating by arc striking, first be that mother metal is melted, within certain process time, (according to product thickness situation, the process time is between 0.1 second-5 seconds) make mother metal form liquid state molten pool, and welding wire is preheating in the certain limit of distance molten bath first, then progressively close to molten bath, wlding is finally made to melt.Last the right and left metal realizes congruent melting with welding wire three and welds.
Although the present invention discloses as above by preferred embodiment; but and be not used to limit the present invention, anyly know this those skilled in the art, without departing from the spirit and scope of the present invention; can do a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on claims scope required for protection.
Claims (10)
1. gas tungstun arc welding connects a method, it is characterized in that, comprising:
During welding, tungsten electrode is as electrode with molten solder mother metal, forms liquid state molten pool at the pad of welding base metal;
Utilize liquid state molten pool to heat wlding to weld.
2. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, the fusing mode of wlding is not that the heat produced by electrode arc striking is melted, but utilizes the liquid state molten pool formed to melt wlding.
3. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, heats welding base metal, and within certain process time, make welding base metal form liquid state molten pool, wlding, progressively close to molten bath, finally makes wlding melt.
4. gas tungstun arc welding according to claim 3 connects method, it is characterized in that, the distance of wlding distance tungsten electrode central point is at more than 3mm, and wlding distance position, molten bath is between 0.5-50mm scope.
5. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, content≤0.2% of carbon in described wlding composition, the content of manganese between 0.7%-2.5%, between the content 0.4%-1.5% of silicon.
6. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, weld seam internal component is formed by welding base metal composition and the congruent melting of wlding composition.
7. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, angle during welding between tungsten electrode axial line and the center line of welding work pieces is between 15 °-85 °.
8. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, during welding, the angle of workpiece axial line and horizontal plane is between 2 °-178 °.
9. gas tungstun arc welding according to claim 1 connects method, it is characterized in that, described welding method is applied to the welding of carbon steel work-piece.
10. a kind of gas tungstun arc welding described in the arbitrary claim of claim 1 ~ 9 connects method and is applied to liquid receiver for compressor, noise reducer for air conditioner, central air-conditioning gas-liquid separator or gs-oil separator; the blast pipe of compressor, air suction inner pipe, air suction outer tube, reservoir air inlet pipe or reservoir escape pipe, the welding of the pipe arrangement of air-conditioner, tube connector, reversal valve pipe or expansion valve pipe.
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| CN105171203B (en) * | 2015-10-20 | 2017-08-01 | 常州常发制冷科技有限公司 | Evaporator fin body automatic argon arc welder |
| CN113996892A (en) * | 2021-11-29 | 2022-02-01 | 广东荣驰智能科技有限公司 | TIG welding manufacturing process of compressor liquid accumulator |
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