CN102259227B - Method for welding heat exchanger in gas water heater - Google Patents
Method for welding heat exchanger in gas water heater Download PDFInfo
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- CN102259227B CN102259227B CN 201010185863 CN201010185863A CN102259227B CN 102259227 B CN102259227 B CN 102259227B CN 201010185863 CN201010185863 CN 201010185863 CN 201010185863 A CN201010185863 A CN 201010185863A CN 102259227 B CN102259227 B CN 102259227B
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Abstract
The invention relates to a method for welding a heat exchanger in a gas water heater. The method is technically characterized by comprising the following steps of: assembling a heat exchange direct pipe, a heat exchange fin and a heat exchange end piece to form a heat exchanger assembly; welding the heat exchanger assembly and a heat exchanger shell; and welding a coiler and a heat exchanger shell by an argon-arc spot-welding machine in a spot-welding mode, wherein primary welding current of performing spot welding on a welding spot by the argon-arc spot-welding machine is between 160 and 300 A, and the primary welding time is 0.6 to 1 second. The method has the characteristics of improving welding efficiency effectively, reducing welding cost, improving the appearance quality of the heat exchanger and the like.
Description
Technical field: the welding method that the present invention relates to a kind of heat exchanger in gas water heater.
Background technology: in the prior art, the welding method of heat exchanger in gas water heater is: first heat exchanger assemblies and heat exchanger housing are welded together by manual soldering; Again coil pipe is blocked fixingly with many stainless steel cards, and be fixed into one by ac spot welding machine and heat exchanger housing spot welding, perhaps by manual soldering, coil pipe and heat exchanger housing are fixed into one; Then will weld in the plumbous liquid that good workpiece immerses melting and soak.Need to use a plurality of stainless steel cards during due to fixing coil pipe, perhaps manual soldering is fixed by welding rod melting welding, and during manual soldering, local warming easily causes the heat exchanger housing surface irregularity, cause and exist welding efficiency low, welding cost is high, the defectives such as presentation quality is poor in order to overcome these defectives, are improved the welding method of heat exchanger in gas water heater.
Summary of the invention: technical problem to be solved by this invention is to provide a kind of welding method of heat exchanger in gas water heater, and it can effectively improve welding efficiency, reduces welding cost, promotes the characteristics such as heat exchanger presentation quality.
The technical scheme that the present invention solves its technical problem employing is: at first heat exchange straight tube, heat exchanger fin, heat exchange dististyle are assembled into heat exchanger assemblies, again heat exchanger assemblies and heat exchanger housing are welded to connect, then coil pipe and heat exchanger housing are passed through argon arc spot welding machine spot-welded on, the welding current for the first time of a solder joint of described argon arc spot welding machine spot welding is 160～300A, and be 0.6～1 second weld interval for the first time.
The welding current for the first time of a solder joint of described argon arc spot welding machine spot welding is 230A, and be 0.8 second weld interval for the first time.
60～the 80A of welding current for the second time of the same solder joint of described argon arc spot welding machine spot welding, be 0.2～0.6 second weld interval for the second time.
The 70A of welding current for the second time of the same solder joint of described argon arc spot welding machine spot welding, be 0.4 second weld interval for the second time.
Before coil pipe and heat exchanger housing are welded to connect, first workpiece is removed greasy dirt by baking oven.
The baking temperature of workpiece in baking oven is 400～500 ℃, and the stoving time of workpiece in baking oven is 4～10 minutes.
Described baking oven operating temperature is 450 ℃, and the stoving time in baking oven is 7 minutes.
Heat exchanger assemblies and heat exchanger housing are welded to connect are argon arc spot welding machine spot-welded on.
Immerse after coil pipe and the spot welding of heat exchanger housing argon arc spot welding machine are completed in the plumbous liquid of melting and soak.
The preparation method of described heat exchanger assemblies is: the heat exchange straight tube by required size and quantity is enclosed within on the lamination column of laminating fixture, be inserted at heat exchange straight tube one end the heat exchange dististyle that piece of metal is made, sheet metal is heat exchanger fin through the punch press continuous punch forming, heat exchanger fin connects a slice by heat exchange through hole a slice and is inserted on the outer wall of heat exchange straight tube until after requirement, the other end at the heat exchange straight tube is inserted in another sheet heat exchange dististyle again, makes heat exchanger assemblies.
The present invention compares the beneficial effect that produces with background technology:
1, because adopting, the present invention at first heat exchange straight tube, heat exchanger fin, heat exchange dististyle are assembled into heat exchanger assemblies, again heat exchanger assemblies and heat exchanger housing are welded to connect, then coil pipe and heat exchanger housing are passed through argon arc spot welding machine spot-welded on, the welding current for the first time of a solder joint of described argon arc spot welding machine spot welding is 160～300A, be the method for 0.6～1 second weld interval for the first time, therefore it can improve welding efficiency effectively, reduce welding cost, promote the heat exchanger presentation quality.
Description of drawings: Fig. 1 is structural representation of the present invention.
Fig. 2 is the stereogram of Fig. 1.
Fig. 3 is the explosive view of Fig. 1.
Fig. 4 is the preparation method schematic diagram of heat exchanger assemblies 1 in Fig. 1.
The specific embodiment: shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, the present embodiment comprises heat exchanger assemblies 1, heat exchanger housing 2, coil pipe 3.heat exchanger assemblies 1 comprises heat exchange straight tube 4, heat exchanger fin 5, bridge piece 10 parts such as grade, the preparation method of heat exchanger assemblies 1 is: the heat exchange straight tube 4 by required size and quantity is enclosed within on the lamination column 8 of laminating fixture 7, be inserted at heat exchange straight tube 4 one ends the heat exchange dististyle 6 that piece of metal is made, sheet metal is heat exchanger fin 5 through the punch press continuous punch forming, heat exchanger fin 5 connects a slice by heat exchange through hole 9 a slices and is inserted on the outer wall of heat exchange straight tube 4 until after requirement, be inserted in again another sheet heat exchange dististyle 6 on heat exchange straight tube 4, be communicated with by bridge piece 10 between adjacent heat exchange straight tube 4 and form heat exchanger channels.
At first heat exchanger assemblies 1, heat exchanger housing 2, coil pipe 3 are put into 400～500 ℃ of baking ovens and toasted 4～10 minutes to remove its surface and oil contaminant, as 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes etc., also can adopt alkali lye or acid solution to clean to remove its surface and oil contaminant; Again heat exchanger assemblies 1 is assemblied in the top of heat exchanger housing 2, and welds or argon arc spot welding machine spot-welded on by manual soldering; Then coil pipe 3 is enclosed within on the heat exchanger housing 2 that welds heat exchanger assemblies 1, coil pipe 3 is communicated with heat exchanger channels, and with the argon arc spot welding machine, coil pipe 3 spot welding is fixed on heat exchanger housing 2.
The welding current for the first time of a solder joint of argon arc spot welding machine spot welding is 160～300A, as 160A, 170A, 180A, 190A, 200A, 210A, 220A, 230A, 240A, 250A, 260A, 270A, 280A, 290A, 300A etc., 0.6～1 second weld interval for the first time was as 0.6 second, 0.7 second, 0.8 second, 0.9 second, 1.0 seconds etc.The number of times that also can increase welding reduces welding current simultaneously with the protection weldment; 60～the 80A of welding current for the second time of the same solder joint of argon arc spot welding machine spot welding; as 60A, 65A, 070A, 75A, 80A etc.; 0.2～0.6 second weld interval for the second time was as 0.2 second, 0.3 second, 0.4 second, 0.5 second, 0.6 second etc.Weld 8～16 solder joints between each circle of coil pipe 3 and heat exchanger housing 2, as 8,9,10,11,12,13,14,15,16 etc.; To weld at last in the plumbous liquid that good workpiece immerses melting and soak, the plumbous liquid cooling that is attached to surface of the work but firmly fixes each workpiece together afterwards, forms at last complete heat exchanger.
Ac spot welding machine is comprised of annexes such as step-down transformer, current regulator and cooling system and welding lead, handles.Needn't use welding rod during welding, two workpiece that only need wish is welded utilize the high temperature of contact resistance place's generation respectively as two electrodes of circuit, with the metal instant melting, thereby workpiece are firmly welded together.
In prior art, use the stainless steel card of a plurality of spaces to push down coil pipe 3, the two ends of stainless steel card are fixed on the outer wall of heat exchanger housing 2 by ac spot welding machine spot welding, thus with coil pipe 3 positioning compressions on heat exchanger housing 2.Use the relative operation of the present invention of ac spot welding machine soldering stainless steel card more, increased product cost owing to having increased the stainless steel card, the stainless steel card belongs to different metal materials and welds firmly not from heat exchanger housing 2 made of copper simultaneously.
Soldering is to utilize fusing point than the low-melting filling metal of mother metal (by brazing material) (being called solder or scolder), at lower than mother metal fusing point, temperature higher than the solder fusing point, utilize liquid solder at the mother metal moistened surface, sprawl and joint filling in the mother metal gap, mutually dissolve and diffusion with mother metal, and realize the welding method of the connection between part.Solderer is than melting welding, and during soldering, mother metal does not melt, only solder fusing.
In prior art, coil pipe 3 is enclosed within on heat exchanger housing 2 location, then by manual soldering, scolder is melted in the junction of coil pipe 3 and heat exchanger housing 2, after liquid solder is cooling with coil pipe 3 and heat exchanger housing 2 securely welded together realize fastening.During manual soldering, scolder is placed on the junction of coil pipe 3 and heat exchanger housing 2, heating makes its thawing to scolder to utilize thermal-flame, thermal-flame has also carried out local heat to coil pipe 3 and heat exchanger housing 2 in the heating scolder, make the surface of heat exchanger housing 2 because of the inhomogeneous deformation that produces of being heated, rough phenomenon appears in the surface of final heat exchanger housing 2, and presentation quality is relatively poor.
The argon arc spot welding machine flows through a kind of inert gas (argon gas commonly used) of the metal chemically reactive of getting along well around welding arc; form a protection gas hood; the metal that makes tungsten electrode termination, electric arc and molten bath and be in high temperature contact with air, can prevent oxidation and absorption pernicious gas.Thereby form fine and close welding point, its mechanical property is better.
In the present invention, after coil pipe 3 is enclosed within on heat exchanger housing 2 location, use the argon arc spot welding machine to carry out argon arc spot welding to the inwall of the contact site of heat exchanger housing 2 and coil pipe 3, coil pipe 3 is securely fixed on heat exchanger housing 2, do not need to use the stainless steel card, do not fix by welding rod melting welding yet, local warming when also having avoided manual soldering and make heat exchanger housing 2 surface irregularities, therefore it can effectively improve the welding efficiency of heat exchanger in gas water heater, reduce welding cost, promote the heat exchanger presentation quality.
Claims (9)
1. the welding method of a heat exchanger in gas water heater, it is characterized in that it comprises: at first with heat exchange straight tube (4), heat exchanger fin (5), heat exchange dististyle (6) is assembled into heat exchanger assemblies (1), again heat exchanger assemblies (1) and heat exchanger housing (2) are welded to connect, then coil pipe (3) and heat exchanger housing (2) are passed through argon arc spot welding machine spot-welded on, the welding current for the first time of a solder joint of described argon arc spot welding machine spot welding is 160～300A, be 0.6～1 second weld interval for the first time, 60～the 80A of welding current for the second time of the same solder joint of described argon arc spot welding machine spot welding, be 0.2～0.6 second weld interval for the second time.
2. the welding method of heat exchanger in gas water heater according to claim 1, is characterized in that the welding current for the first time of a solder joint of described argon arc spot welding machine spot welding is 230A, and be 0.8 second weld interval for the first time.
3. the welding method of heat exchanger in gas water heater according to claim 1 and 2 is characterized in that the 70A of welding current for the second time of the same solder joint of described argon arc spot welding machine spot welding, and be 0.4 second weld interval for the second time.
4. the welding method of heat exchanger in gas water heater according to claim 1 and 2, is characterized in that first workpiece being removed greasy dirt by baking oven before coil pipe (3) and heat exchanger housing (2) are welded to connect.
5. the welding method of heat exchanger in gas water heater according to claim 4, is characterized in that the baking temperature of workpiece in baking oven is 400～500 ℃, and the stoving time of workpiece in baking oven is 4～10 minutes.
6. the welding method of heat exchanger in gas water heater according to claim 5, is characterized in that described baking oven operating temperature is 450 ℃, and the stoving time in baking oven is 7 minutes.
7. the welding method of heat exchanger in gas water heater according to claim 5 is characterized in that heat exchanger assemblies (1) and heat exchanger housing (2) are welded to connect and is argon arc spot welding machine spot-welded on.
8. the welding method of heat exchanger in gas water heater according to claim 7 is characterized in that soaking in the plumbous liquid of immersion melting after coil pipe (3) and the spot welding of heat exchanger housing (2) argon arc spot welding machine are completed.
9. the welding method of heat exchanger in gas water heater according to claim 8, the preparation method that it is characterized in that described heat exchanger assemblies (1) is: the heat exchange straight tube by required size and quantity is enclosed within on the lamination column (8) of laminating fixture (7), be inserted at heat exchange straight tube (4) one ends the heat exchange dististyle (6) that piece of metal is made, sheet metal is heat exchanger fin (5) through the punch press continuous punch forming, heat exchanger fin (5) connects a slice by heat exchange through hole (9) a slice and is inserted on the outer wall of heat exchange straight tube (4) until after requirement, the other end at heat exchange straight tube (4) is inserted in another sheet heat exchange dististyle again, make heat exchanger assemblies (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010185863 CN102259227B (en) | 2010-05-25 | 2010-05-25 | Method for welding heat exchanger in gas water heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010185863 CN102259227B (en) | 2010-05-25 | 2010-05-25 | Method for welding heat exchanger in gas water heater |
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| CN102259227A CN102259227A (en) | 2011-11-30 |
| CN102259227B true CN102259227B (en) | 2013-06-19 |
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| CN 201010185863 Active CN102259227B (en) | 2010-05-25 | 2010-05-25 | Method for welding heat exchanger in gas water heater |
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| CN104191069B (en) * | 2014-07-25 | 2016-03-02 | 武汉宇宙科技有限公司 | A kind of radiation pipe burner tip smoke gas afterheat heat exchanger manufacture craft |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396033A (en) * | 2001-07-05 | 2003-02-12 | 株式会社电装 | Method for making heat exchanger |
| CN201364042Y (en) * | 2009-02-10 | 2009-12-16 | 梁楚虹 | Heat exchanger for gas water heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2678230B2 (en) * | 1987-01-14 | 1997-11-17 | バブコツク日立株式会社 | Heat treatment method for welds |
| JPH1058191A (en) * | 1996-08-27 | 1998-03-03 | Mitsubishi Heavy Ind Ltd | Back seal method used for tube welding |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396033A (en) * | 2001-07-05 | 2003-02-12 | 株式会社电装 | Method for making heat exchanger |
| CN201364042Y (en) * | 2009-02-10 | 2009-12-16 | 梁楚虹 | Heat exchanger for gas water heater |
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| CN102259227A (en) | 2011-11-30 |
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