CN102259227A - 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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- CN102259227A CN102259227A CN2010101858632A CN201010185863A CN102259227A CN 102259227 A CN102259227 A CN 102259227A CN 2010101858632 A CN2010101858632 A CN 2010101858632A CN 201010185863 A CN201010185863 A CN 201010185863A CN 102259227 A CN102259227 A CN 102259227A
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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 heat exchanger in a kind of gas heater.
Background technology: in the prior art, the welding method of heat exchanger is in the gas heater: earlier 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, perhaps coil pipe and heat exchanger housing are fixed into one by manual soldering by ac spot welding machine and heat exchanger housing spot welding; To weld then in the plumbous liquid that good workpiece immerses fusion and soak.Owing to fixedly need use a plurality of stainless steel cards during coil pipe, perhaps manual soldering is fixed by welding rod melting welding, and local warming causes the heat exchanger housing surface irregularity easily during manual soldering, cause and exist welding efficiency low, the welding cost height, defectives such as presentation quality difference in order to overcome these defectives, are improved the welding method of heat exchanger in the gas heater.
Summary of the invention: technical problem to be solved by this invention provides the welding method of heat exchanger in a kind of gas heater, and it can effectively improve welding efficiency, reduces welding cost, promotes 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 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 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.
Welding current 60～the 80A 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 welding current 70A 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, earlier 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 be welded to connect be argon arc spot welding machine spot-welded on.
After coil pipe and the spot welding of heat exchanger housing argon arc spot welding machine are finished, immerse in the plumbous liquid of fusion 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 lamination anchor clamps, be inserted in the metal heat exchange dististyle of a slice at heat exchange straight tube one end, sheet metal is a heat exchanger fin through the continuous punch forming of punch press, 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 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 is produced 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 first time of a solder joint of described argon arc spot welding machine spot welding is 160～300A, be 0.6～1 second method weld interval for the first time, so it can improve welding efficiency effectively, reduce welding cost, promote the heat exchanger presentation quality.
Description of drawings: Fig. 1 is a 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 among Fig. 1.
The specific embodiment: shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4, 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 lamination anchor clamps 7, be inserted in the metal heat exchange dististyle 6 of a slice at heat exchange straight tube 4 one ends, sheet metal is a heat exchanger fin 5 through the continuous punch forming of punch press, 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 after requirement, on heat exchange straight tube 4, be inserted in another sheet heat exchange dististyle 6 again, be communicated with the formation heat exchanger channels by bridge piece 10 between the adjacent heat exchange straight tube 4.
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 by manual soldering welding or argon arc spot welding machine spot-welded on; 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 the heat exchanger housing 2.
The welding current 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; welding current 60～the 80A 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 the 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 fusion and soak, each workpiece be firmly fixed together after being attached to the plumbous liquid cooling but of surface of the work, form complete heat exchanger at last.
Ac spot welding machine is made up 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 desire is welded are respectively as two electrodes of circuit, and the high temperature that utilizes the contact resistance place to produce with the metal instant melting, thereby firmly welds together workpiece.
In the 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, thereby coil pipe 3 location are pressed on the 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 increased the stainless steel card, the stainless steel card belongs to different metal materials and welds firmly inadequately with 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), be lower than the mother metal fusing point, be higher than under the temperature of solder fusing point, utilize liquid solder at the mother metal moistened surface, sprawl and joint filling in the mother metal gap, dissolve mutually and diffusion with mother metal, and the welding method of the connection between the realization part.Solderer is than melting welding, and mother metal does not melt during soldering, only solder fusing.
In the prior art, coil pipe 3 is enclosed within on the heat exchanger housing 2 location, by manual soldering scolder is melted in the junction of coil pipe 3 and heat exchanger housing 2 then, after the liquid solder cooling that coil pipe 3 and heat exchanger housing 2 realization welded together securely is fastening.During the craft 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 when adding hot solder, the surface that makes heat exchanger housing 2 is 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; make tungsten electrode termination, electric arc and molten bath reach the metal that has been in high temperature and do not contact, can prevent oxidation and absorb pernicious gas with air.Thereby form fine and close welding point, its mechanical property is better.
Among the present invention, after coil pipe 3 is enclosed within on the heat exchanger housing 2 location, use the argon arc spot welding machine that the inwall of the contact site of heat exchanger housing 2 and coil pipe 3 is carried out argon arc spot welding, coil pipe 3 is securely fixed on the 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, so it can effectively improve the welding efficiency of heat exchanger in the gas heater, reduce welding cost, promote the heat exchanger presentation quality.
Claims (10)
1. the welding method of heat exchanger in the gas heater, it is characterized in that it comprises: at first heat exchange straight tube (4), heat exchanger fin (5), heat exchange dististyle (6) are 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 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.
2. the welding method of heat exchanger in the gas heater according to claim 1 is characterized in that the welding current 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 the gas heater according to claim 1 and 2 is characterized in that the welding current 60～80A second time of the same solder joint of described argon arc spot welding machine spot welding, and be 0.2～0.6 second weld interval for the second time.
4. the welding method of heat exchanger in the gas heater according to claim 3 is characterized in that the welding current 70A 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.
5. the welding method of heat exchanger in the gas heater according to claim 3 is characterized in that earlier workpiece being removed greasy dirt by baking oven before coil pipe (3) and heat exchanger housing (2) are welded to connect.
6. the welding method of heat exchanger in the gas heater according to claim 5 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.
7. the welding method of heat exchanger in the gas heater according to claim 6 is characterized in that described baking oven operating temperature is 450 ℃, and the stoving time in baking oven is 7 minutes.
8. the welding method of heat exchanger in the gas heater according to claim 6 is characterized in that heat exchanger assemblies (1) and heat exchanger housing (2) be welded to connect and is argon arc spot welding machine spot-welded on.
9. the welding method of heat exchanger in the gas heater according to claim 8 is characterized in that soaking in the plumbous liquid of coil pipe (3) and the spot welding of heat exchanger housing (2) argon arc spot welding machine being finished back immersion fusion.
10. the welding method of heat exchanger in the gas heater according to claim 9, 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 lamination anchor clamps (7), be inserted in the metal heat exchange dististyle of a slice (6) at heat exchange straight tube (4) one ends, sheet metal is heat exchanger fin (5) through the continuous punch forming of punch press, 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) after requirement, the other end at heat exchange straight tube (4) is inserted in another sheet heat exchange dististyle again, makes heat exchanger assemblies (1).
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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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| Publication Number | Publication Date |
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| CN102259227A true CN102259227A (en) | 2011-11-30 |
| CN102259227B CN102259227B (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104191069A (en) * | 2014-07-25 | 2014-12-10 | 武汉宇宙科技有限公司 | Manufacturing process of smoke waste heat exchanger for radiant tube burner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176434A (en) * | 1987-01-14 | 1988-07-20 | Babcock Hitachi Kk | Heat treatment for welding zone |
| JPH1058191A (en) * | 1996-08-27 | 1998-03-03 | Mitsubishi Heavy Ind Ltd | Back seal method used for tube welding |
| 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 |
-
2010
- 2010-05-25 CN CN 201010185863 patent/CN102259227B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176434A (en) * | 1987-01-14 | 1988-07-20 | Babcock Hitachi Kk | Heat treatment for welding zone |
| JPH1058191A (en) * | 1996-08-27 | 1998-03-03 | Mitsubishi Heavy Ind Ltd | Back seal method used for tube welding |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104191069A (en) * | 2014-07-25 | 2014-12-10 | 武汉宇宙科技有限公司 | Manufacturing process of smoke waste heat exchanger for radiant tube burner |
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| CN102259227B (en) | 2013-06-19 |
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