CN105234515A - Welding process for suction and exhaust pipe of liquid accumulator - Google Patents

Welding process for suction and exhaust pipe of liquid accumulator Download PDF

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Publication number
CN105234515A
CN105234515A CN201510594589.7A CN201510594589A CN105234515A CN 105234515 A CN105234515 A CN 105234515A CN 201510594589 A CN201510594589 A CN 201510594589A CN 105234515 A CN105234515 A CN 105234515A
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CN
China
Prior art keywords
welding
pipe
reservoir
deg
weldment
Prior art date
Application number
CN201510594589.7A
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Chinese (zh)
Inventor
樊锋
胡泽华
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芜湖三花制冷配件有限公司
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Priority to CN201510594589.7A priority Critical patent/CN105234515A/en
Publication of CN105234515A publication Critical patent/CN105234515A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • B23K1/20Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • B23K1/20Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B23K1/206Cleaning

Abstract

The invention discloses a welding process for a suction and exhaust pipe of a liquid accumulator. The liquid accumulator, a small steel pipe and a copper elbow pipe are included. A sleeve pipe is arranged at the joint of the small steel pipe and the copper elbow pipe, and the sleeve pipe is clamped at a through hole of the liquid accumulator. The welding process comprises the following steps of pre-welding processing including grinding and cleaning, component assembling, namely forming a weld assembly by clamping the end of the small steel pipe and the end of the copper elbow pipe in the sleeve pipe, and welding. As welding is carried out by clamping the sleeve pipe of the weld assembly at the through hole of the liquid accumulator, the potential hazards of leakage of a weld joint are reduced and eliminated; one-time welding or multi-time welding is carried out on copper pipes, iron pipes and other materials or structural products through different welding processes; the leakage rate is about hundreds of PPM through an existing conventional welding process; the leakage rate after improvement is about several PPM, and leakage is nearly eradicated.

Description

A kind of welding procedure of reservoir suction tracheae

Technical field

The present invention relates to refrigeration, pressure vessel field, particularly a kind of welding procedure of reservoir suction tracheae.

Background technology

In the welding process of heterogeneous material, because both chemical composition, thermal conductivity factor, fusing point and various mechanical performance have great gap, therefore weld difficulty weld with similar material compared with much bigger, Joint Strength and sealing difference instability have leakage hidden danger, existing technique once weld or twice welding integral cost higher.

In prior art, also more improvement has been done for above problem, as publication number CN104551352A discloses a kind of method for welding dissimilar metal, for the connecting pipe of shell termination of soldering low alloy steel matter and the safe end of stainless steel, this welding method comprises following steps: adopt the inner wall overlaying inner wall overlaying layer of stainless steel strip surfacing in connecting pipe of shell termination; Prepare the safe end that bevel for welding is monolateral groove type; Adopt the butting grooves of individual layer list pipeline narrow gap automatic pulsed tungsten argon arc welding welded case adapter termination and safe end.This invention, without separation layer welding step, saves wlding, shortens the duration, reduces welding cost and labour intensity, but still there is Joint Strength and sealing difference instability, has the hidden danger of leakage.

If publication number is that CN101259556A discloses a kind of low pressure welding technique for metal hose joint, its key step is: first, by the joint that lathe process one is special, is alignd by finished metal flexible pipe with joint; Secondly, by 1-2 the welding on outer layer surface of argon arc welding machine stainless steel wire; Finally, polish.The welding method of this invention uses the joint of unlike material, take stainless steel welding stick as solder, utilize argon arc welding machine by solder with metal hose together with weld, solve the problem that metal hose is not easily connected with joint, but still there is Joint Strength and sealing difference instability equally, have the hidden danger of leakage.

Be the argon-are welding technology of a kind of iron white copper thick-walled pipe of CN103801800A as publication number, its step is followed successively by: a) material prepares: (1) welding wire selects MONEL67 welding wire; (2) purity of argon >=99.9999%; B) process cut: the mode adopting machining, slope type is V-type; C) preweld cleaning: the greasy dirt of welding wire, weldment, double V-groove and groove both sides, moisture, oxide-film are cleaned out, ensures weld any surface finish; D) weld: adopt single-sided welding two-sides forming welding procedure to welding position, namely double V-groove place welds; E) after welding treatment: postwelding butt welded seam is cleared up, checks that whether weld seam is even, fine and close, has flawless, pore, is mingled with, the defect such as lack of penetration, incomplete fusion, if carry out repair welding again after having excessive defect should remove defect.Although the present invention's technique is simple, easily grasp, cost is low, and welding point place weld seam sealing is poor, and intensity is low, easily leaks.

And for example publication number is that CN102962543A discloses and a kind of carries out welding procedure to red copper and stainless steel dissimilar material, and described welding procedure comprises the steps:

A, at the copper member side finished edge relative with stainless steel component, the foreign material of cleaning bevelled edge, are placed on same plane by copper member and stainless steel component and are grouping, and preset clearance;

B, copper member side carried out to the weld preheating of 600-680 DEG C;

C, carry out point according to solid several positions of order between copper member and stainless steel component of point and consolidate;

Copper member welds with stainless steel component by D, employing SMAW DC reverse connection;

E, postwelding Welded Joints carry out being heated to 130-180 DEG C, and then cool to room temperature carries out the hydrogen process that disappears, and reduce the content of hydrogen in weld seam;

F, after the hydrogen process that disappears, 840-890 DEG C of stabilization processes is carried out to stainless steel component side and cools fast, to reduce the formation of chromium carbide, improve plasticity and the toughness of weld seam.

By contrast, this invention adopts new welding process to weld with stainless steel dissimilar material joint red copper, and temperature is very easy to control, and be again melting welding, packing material fuses together completely in mother metal, and quality is guaranteed, but technique is comparatively complicated, production cost is higher.

Existing technique is:

1) copper pipe+iron pipe+other material or infrastructure product divide: 1 welding or twice welding;

2) quality hidden danger: first: Joint Strength and sealing difference instability have leakage hidden danger;

3) cost: existing technique once weld or twice welding integral cost higher.

Although disclosed the welding procedure of a lot of heterogeneous material in prior art, still there is following problem in the welding procedure prior art of heterogeneous material: 1. welding procedure is complicated; 2. welding integral cost is higher; 3. welding efficiency is low; 4. Joint Strength and sealing poor, welding instability have leakage hidden danger.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of welding procedure of reservoir suction tracheae, to solve the above-mentioned multinomial defect caused in prior art.

For achieving the above object, the invention provides following technical scheme: a kind of welding procedure of reservoir suction tracheae, comprise reservoir, little steel pipe and copper bend pipe, it is characterized in that, the junction of described little steel pipe and copper bend pipe is provided with sleeve pipe, casing clamp in the through hole of reservoir, welding procedure comprises the following steps:

1) weld pre-treatment, comprise polishing and cleaning;

2) assembling parts, is stuck in sleeve pipe by the end of little steel pipe and copper bend pipe, forms weldment;

3) weld;

4) by the through hole of the casing clamp of weldment at reservoir, weld.

Preferably, described step 1) in, polishing, to little steel pipe and copper bend pipe welding zone and around at least polish in 20mm region, polishing is to occurring metallic luster, and wipe oil and oxide-film, ensure that land surfaces is bright and clean.

Preferably, described step 1) in, cleaning, puts into little steel pipe and copper bend pipe the cleaning fluid being added with metal surface degreaser, and ultrasonic cleaning is carried out in heating, and then rinse with clear water, taking-up is dried stand-by.

Preferably, described step 1) in, the ultrasonic cleaning time is 30min-60min, and described bake out temperature is 35 DEG C-70 DEG C.

Preferably, described step 3) in, welding comprises the following steps:

(1) respectively solder and brazing flux are filled to the commissure of little steel pipe and copper bend pipe;

(2) by frock, weldment is clamped;

(3) by adding solder, the weldment of brazing flux puts into induction heating equipment heating region with frock, after guaranteeing that welding position is in welding region center, carry out heating and being incubated;

(4), after insulation terminates, stop heating, allow weldment naturally cool.

Preferably, described heating and thermal insulation process is: make induction heating equipment linear temperature increase, makes welding position temperature at the uniform velocity rise to 900 DEG C from room temperature, used time, at 15s-30s, regulates eddy-current heating frequency, welding position temperature is walked unhurriedly and is warming up to 990 DEG C-1020 DEG C, used time at 3s-5s, then is incubated 2s-3s.

Preferably, described step 4) in, weldment is fixed on the through hole of transfusion device, then solid-state spelter bronze is filled into weld seam; By the reservoir to be welded that assembles by brazier, brazier temperature controls between 950 DEG C-1020 DEG C, by the speed of brazier at 0.2-0.7 m/min.

Preferably, described step 4), after welding, first with ultrasonic wave automatic detection device, copper and stainless steel water inlet pipe and water outlet pipe joint quality are detected, then postwelding finished product are cleaned.

The beneficial effect of above technical scheme is adopted to be: the present invention reduces, stop welding junction leaks hidden danger, and copper pipe+iron pipe+other material or infrastructure product divide: adopt 1 welding of different welding procedure or multiple welding; After existing common process welding, slip is about hundreds of PPM; Improve after slip be about several PPM be close to do not leak.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Wherein, 1--steel pipe, 2--copper bend pipe, 3--sleeve pipe, 4--reservoir.

Detailed description of the invention

The preferred embodiment of the present invention is described in detail below in conjunction with accompanying drawing.

Embodiment 1:

A welding procedure for reservoir suction tracheae, comprises reservoir, little steel pipe and copper bend pipe, it is characterized in that, the junction of described little steel pipe and copper bend pipe is provided with sleeve pipe, casing clamp in the through hole of reservoir, welding procedure comprises the following steps:

1) weld pre-treatment, comprise polishing and cleaning;

2) assembling parts, is stuck in sleeve pipe by the end of little steel pipe and copper bend pipe, forms weldment;

3) weld;

4) by the through hole of the casing clamp of weldment at reservoir, weld.

In the present embodiment, step 1) in, polishing, to little steel pipe and copper bend pipe welding zone and around at least polish in 20mm region, polishing is to occurring metallic luster, and wipe oil and oxide-film, ensure that land surfaces is bright and clean; Cleaning, puts into little steel pipe and copper bend pipe the cleaning fluid being added with metal surface degreaser, and ultrasonic cleaning is carried out in heating, and then rinse with clear water, taking-up is dried stand-by, and the ultrasonic cleaning time is 30min, and described bake out temperature is 70 DEG C.

Step 3) in, welding comprises the following steps:

(1) respectively solder and brazing flux are filled to the commissure of little steel pipe and copper bend pipe;

(2) by frock, weldment is clamped;

(3) by adding solder, the weldment of brazing flux puts into induction heating equipment heating region with frock, after guaranteeing that welding position is in welding region center, carry out heating and being incubated;

(4), after insulation terminates, stop heating, allow weldment naturally cool.

Heating and thermal insulation process is: make induction heating equipment linear temperature increase, makes welding position temperature at the uniform velocity rise to 900 DEG C from room temperature, and the used time, regulate eddy-current heating frequency, welding position temperature is walked unhurriedly and is warming up to 990 DEG C DEG C, the used time at 5s, then was incubated 3s at 30s.

Step 4) in, weldment is fixed on the through hole of transfusion device, then solid-state spelter bronze is filled into weld seam; By the reservoir to be welded that assembles by brazier, brazier temperature controls between 950 DEG C, by the speed of brazier at 0.2 m/min.

Step 4) welding after, first with ultrasonic wave automatic detection device, copper and stainless steel water inlet pipe and water outlet pipe joint quality are detected, then postwelding finished product are cleaned.

Embodiment 2:

A welding procedure for reservoir suction tracheae, comprises reservoir, little steel pipe and copper bend pipe, it is characterized in that, the junction of described little steel pipe and copper bend pipe is provided with sleeve pipe, casing clamp in the through hole of reservoir, welding procedure comprises the following steps:

1) weld pre-treatment, comprise polishing and cleaning;

2) assembling parts, is stuck in sleeve pipe by the end of little steel pipe and copper bend pipe, forms weldment;

3) weld;

4) by the through hole of the casing clamp of weldment at reservoir, weld.

In the present embodiment, step 1) in, polishing, to little steel pipe and copper bend pipe welding zone and around at least polish in 20mm region, polishing is to occurring metallic luster, and wipe oil and oxide-film, ensure that land surfaces is bright and clean; Cleaning, puts into little steel pipe and copper bend pipe the cleaning fluid being added with metal surface degreaser, and ultrasonic cleaning is carried out in heating, and then rinse with clear water, taking-up is dried stand-by, and the ultrasonic cleaning time is 60min, and described bake out temperature is 35 DEG C.

Step 3) in, welding comprises the following steps:

(1) respectively solder and brazing flux are filled to the commissure of little steel pipe and copper bend pipe;

(2) by frock, weldment is clamped;

(3) by adding solder, the weldment of brazing flux puts into induction heating equipment heating region with frock, after guaranteeing that welding position is in welding region center, carry out heating and being incubated;

(4), after insulation terminates, stop heating, allow weldment naturally cool.

Heating and thermal insulation process is: make induction heating equipment linear temperature increase, makes welding position temperature at the uniform velocity rise to 900 DEG C from room temperature, and the used time, regulate eddy-current heating frequency, welding position temperature is walked unhurriedly and is warming up to 1020 DEG C, the used time at 3s, then was incubated 2s at 15s.

Step 4) in, weldment is fixed on the through hole of transfusion device, then solid-state spelter bronze is filled into weld seam; By the reservoir to be welded that assembles by brazier, brazier temperature controls between 1020 DEG C, by the speed of brazier at 0.7 m/min.

Step 4) welding after, first with ultrasonic wave automatic detection device, copper and stainless steel water inlet pipe and water outlet pipe joint quality are detected, then postwelding finished product are cleaned.

Embodiment 3:

A welding procedure for reservoir suction tracheae, comprises reservoir, little steel pipe and copper bend pipe, it is characterized in that, the junction of described little steel pipe and copper bend pipe is provided with sleeve pipe, casing clamp in the through hole of reservoir, welding procedure comprises the following steps:

1) weld pre-treatment, comprise polishing and cleaning;

2) assembling parts, is stuck in sleeve pipe by the end of little steel pipe and copper bend pipe, forms weldment;

3) weld;

4) by the through hole of the casing clamp of weldment at reservoir, weld.

In the present embodiment, step 1) in, polishing, to little steel pipe and copper bend pipe welding zone and around at least polish in 20mm region, polishing is to occurring metallic luster, and wipe oil and oxide-film, ensure that land surfaces is bright and clean; Cleaning, puts into little steel pipe and copper bend pipe the cleaning fluid being added with metal surface degreaser, and ultrasonic cleaning is carried out in heating, and then rinse with clear water, taking-up is dried stand-by, and the ultrasonic cleaning time is 45min, and described bake out temperature is 50 DEG C.

Step 3) in, welding comprises the following steps:

(1) respectively solder and brazing flux are filled to the commissure of little steel pipe and copper bend pipe;

(2) by frock, weldment is clamped;

(3) by adding solder, the weldment of brazing flux puts into induction heating equipment heating region with frock, after guaranteeing that welding position is in welding region center, carry out heating and being incubated;

(4), after insulation terminates, stop heating, allow weldment naturally cool.

Heating and thermal insulation process is: make induction heating equipment linear temperature increase, makes welding position temperature at the uniform velocity rise to 900 DEG C from room temperature, and the used time, regulate eddy-current heating frequency, welding position temperature is walked unhurriedly and is warming up to 1005 DEG C, the used time at 4s, then was incubated 2.5s at 20s.

Step 4) in, weldment is fixed on the through hole of transfusion device, then solid-state spelter bronze is filled into weld seam; By the reservoir to be welded that assembles by brazier, brazier temperature controls between 985 DEG C, by the speed of brazier at 0.45 m/min.

Step 4) welding after, first with ultrasonic wave automatic detection device, copper and stainless steel water inlet pipe and water outlet pipe joint quality are detected, then postwelding finished product are cleaned.

Embodiment 4:

A welding procedure for reservoir suction tracheae, comprises reservoir, little steel pipe and copper bend pipe, it is characterized in that, the junction of described little steel pipe and copper bend pipe is provided with sleeve pipe, casing clamp in the through hole of reservoir, welding procedure comprises the following steps:

1) weld pre-treatment, comprise polishing and cleaning;

2) assembling parts, is stuck in sleeve pipe by the end of little steel pipe and copper bend pipe, forms weldment;

3) weld;

4) by the through hole of the casing clamp of weldment at reservoir, weld.

In the present embodiment, step 1) in, polishing, to little steel pipe and copper bend pipe welding zone and around at least polish in 20mm region, polishing is to occurring metallic luster, and wipe oil and oxide-film, ensure that land surfaces is bright and clean; Cleaning, puts into little steel pipe and copper bend pipe the cleaning fluid being added with metal surface degreaser, and ultrasonic cleaning is carried out in heating, and then rinse with clear water, taking-up is dried stand-by, and the ultrasonic cleaning time is 30min-60min, and described bake out temperature is 35 DEG C-70 DEG C.

Step 3) in, welding comprises the following steps:

(1) respectively solder and brazing flux are filled to the commissure of little steel pipe and copper bend pipe;

(2) by frock, weldment is clamped;

(3) by adding solder, the weldment of brazing flux puts into induction heating equipment heating region with frock, after guaranteeing that welding position is in welding region center, carry out heating and being incubated;

(4), after insulation terminates, stop heating, allow weldment naturally cool.

Heating and thermal insulation process is: make induction heating equipment linear temperature increase, and make welding position temperature at the uniform velocity rise to 900 DEG C from room temperature, the used time is at 15s-30s, regulate eddy-current heating frequency, welding position temperature is walked unhurriedly and is warming up to 990 DEG C-1020 DEG C, the used time at 3s-5s, then is incubated 2s-3s.

Step 4) in, weldment is fixed on the through hole of transfusion device, then solid-state spelter bronze is filled into weld seam; By the reservoir to be welded that assembles by brazier, brazier temperature controls between 950 DEG C-1020 DEG C, by the speed of brazier at 0.2-0.7 m/min.

Step 4) welding after, first with ultrasonic wave automatic detection device, copper and stainless steel water inlet pipe and water outlet pipe joint quality are detected, then postwelding finished product are cleaned.

The present invention reduces, stop welding junction leaks hidden danger, and copper pipe+iron pipe+other material or infrastructure product divide: adopt 1 welding of different welding procedure or multiple welding; After existing common process welding, slip is about hundreds of PPM; After improving, slip is about that 2-3 PPM is intimate not to be leaked.

Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (8)

1. a welding procedure for reservoir suction tracheae, comprises reservoir, little steel pipe and copper bend pipe, it is characterized in that, the junction of described little steel pipe and copper bend pipe is provided with sleeve pipe, casing clamp in the through hole of reservoir, welding procedure comprises the following steps:
1) weld pre-treatment, comprise polishing and cleaning;
2) assembling parts, is stuck in sleeve pipe by the end of little steel pipe and copper bend pipe, forms weldment;
3) weld;
4) by the through hole of the casing clamp of weldment at reservoir, weld.
2. the welding procedure of reservoir suction tracheae according to claim 1, it is characterized in that, described step 1) in, polishing, to little steel pipe and copper bend pipe welding zone and around at least polish in 20mm region, polishing is to occurring metallic luster, and wipe oil and oxide-film, ensure that land surfaces is bright and clean.
3. the welding procedure of reservoir suction tracheae according to claim 1, is characterized in that, described step 1) in, cleaning, puts into little steel pipe and copper bend pipe the cleaning fluid being added with metal surface degreaser, and ultrasonic cleaning is carried out in heating, then rinse with clear water, taking-up is dried stand-by.
4. the welding procedure of reservoir suction tracheae according to claim 3, is characterized in that, described step 1) in, the ultrasonic cleaning time is 30min-60min, and described bake out temperature is 35 DEG C-70 DEG C.
5. the welding procedure of reservoir suction tracheae according to claim 1, is characterized in that, described step 3) in, welding comprises the following steps:
(1) respectively solder and brazing flux are filled to the commissure of little steel pipe and copper bend pipe;
(2) by frock, weldment is clamped;
(3) by adding solder, the weldment of brazing flux puts into induction heating equipment heating region with frock, after guaranteeing that welding position is in welding region center, carry out heating and being incubated;
(4), after insulation terminates, stop heating, allow weldment naturally cool.
6. the welding procedure of reservoir suction tracheae according to claim 5, it is characterized in that, described heating and thermal insulation process is: make induction heating equipment linear temperature increase, welding position temperature is made at the uniform velocity to rise to 900 DEG C from room temperature, used time, at 15s-30s, regulates eddy-current heating frequency, welding position temperature is walked unhurriedly and is warming up to 990 DEG C-1020 DEG C, used time at 3s-5s, then is incubated 2s-3s.
7. the welding procedure of reservoir suction tracheae according to claim 1, is characterized in that, described step 4) in, weldment is fixed on the through hole of transfusion device, then solid-state spelter bronze is filled into weld seam; By the reservoir to be welded that assembles by brazier, brazier temperature controls between 900 DEG C-1020 DEG C, by the speed of brazier at 0.2-0.7 m/min.
8. the welding procedure of reservoir suction tracheae according to claim 1, it is characterized in that, described step 4), after welding, first with ultrasonic wave automatic detection device, copper and stainless steel water inlet pipe and water outlet pipe joint quality are detected, then postwelding finished product is cleaned.
CN201510594589.7A 2015-09-17 2015-09-17 Welding process for suction and exhaust pipe of liquid accumulator CN105234515A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101015884A (en) * 2007-01-11 2007-08-15 张学志 Copper-aluminum pipe butt welding technique
JP2008036704A (en) * 2006-08-10 2008-02-21 Ahresty Corp Welding joint for aluminum product and steel product, and welding method using the same
CN101493091A (en) * 2008-01-24 2009-07-29 广东美芝制冷设备有限公司 Exhaust pipe for air-conditioned compressor, method for producing the same and assembly method
CN102338517A (en) * 2010-07-28 2012-02-01 新昌县铁牛金属制造有限公司 Stainless steel liquid reservoir and manufacturing process thereof
CN102528193A (en) * 2011-12-30 2012-07-04 刘字冬 Copper and stainless steel brazing process
CN102962633A (en) * 2012-11-30 2013-03-13 东莞市金瑞五金制品有限公司 Assembling technology of liquid storage device and compressor
CN103033002A (en) * 2012-12-31 2013-04-10 东莞市金瑞五金制品有限公司 Liquid reservoir air inlet and outlet pipe and manufacturing method as well as application thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008036704A (en) * 2006-08-10 2008-02-21 Ahresty Corp Welding joint for aluminum product and steel product, and welding method using the same
CN101015884A (en) * 2007-01-11 2007-08-15 张学志 Copper-aluminum pipe butt welding technique
CN101493091A (en) * 2008-01-24 2009-07-29 广东美芝制冷设备有限公司 Exhaust pipe for air-conditioned compressor, method for producing the same and assembly method
CN102338517A (en) * 2010-07-28 2012-02-01 新昌县铁牛金属制造有限公司 Stainless steel liquid reservoir and manufacturing process thereof
CN102528193A (en) * 2011-12-30 2012-07-04 刘字冬 Copper and stainless steel brazing process
CN102962633A (en) * 2012-11-30 2013-03-13 东莞市金瑞五金制品有限公司 Assembling technology of liquid storage device and compressor
CN103033002A (en) * 2012-12-31 2013-04-10 东莞市金瑞五金制品有限公司 Liquid reservoir air inlet and outlet pipe and manufacturing method as well as application thereof

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Application publication date: 20160113

RJ01 Rejection of invention patent application after publication