CN1008242B - Cu-al pipe-cold welding process for vapourizer of refrigerator - Google Patents
Cu-al pipe-cold welding process for vapourizer of refrigeratorInfo
- Publication number
- CN1008242B CN1008242B CN 88105055 CN88105055A CN1008242B CN 1008242 B CN1008242 B CN 1008242B CN 88105055 CN88105055 CN 88105055 CN 88105055 A CN88105055 A CN 88105055A CN 1008242 B CN1008242 B CN 1008242B
- Authority
- CN
- China
- Prior art keywords
- pipe
- copper
- clamp
- aluminum pipe
- cold welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Pressure Welding/Diffusion-Bonding (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to a copper-aluminium tube cold press welding process for an evaporator of an electric refrigerator. During the welding, neither the copper tube nor the aluminium tube are heated; axial extrusion force is exerted to make the mental at the junction surface generate oriented plastic flow under the condition of room temperature; the fresh surfaces of the two metals are mutually approached to achieve the range of atom acting force, so the firm joint is formed. The present invention is composed of process steps, such as weldment processing, cold press welding, junction surface thickening, weldment forming, cleaning, etc. The cold press welding has the advantages of good joint compactness and high quality.
Description
The invention belongs to the copper-aluminum pipe welding technology field.
At present, the welding method of copper-aluminum pipe adaptor has flash welding, capacitor discharge welding, electric resistance welding and friction welding (FW) etc. in the refrigeration system of refrigerator.These method technological parameters are many, equipment is complicated, be difficult to control; These methods all belong to the thermocompression bonding category, and the metal of faying face is heated in the welding process, even local the generation melted.When extruding, be difficult to molten metal and boundary layer metal are squeezed outside the faying face.So in faying face remaining liquid metal film and at high temperature metal diffuseed to form the brittle alloy layer mutually.This brittle alloy layer is by θ phase η
2And r2 phase three parts composition, wherein θ is the immediate cause that causes joint performance inferior mutually.Particularly on the refrigerator assembly line, be connected to the copper-aluminum pipe chovr body in the refrigeration system with argon arc welding and gas brazing, this makes the copper-aluminum pipe joint be subjected to high temperature action once more, and original brittle layer is thickened, joint performance worsens once more, becomes one of reason of refrigeration system seepage.
The objective of the invention is, a kind of cold welding technology that is used for the copper-aluminum pipe of evaporator of electric refrigerator is provided.This technology copper-aluminium faying face place does not have the brittle alloy layer, and the compactness of joint is good, copper-aluminum pipe joint quality height.
Cold welding technology of the present invention, copper pipe and aluminum pipe do not heat during welding, apply with axial compression power under room temperature state, and the directed plasticity of metal generation at faying face place is flowed, be close to the scope of atom effect between the fresh metal surface of two kinds of metals mutually, thereby form firm combination.Therefore, at the interface metal must have enough plastic flow momentum could obtain high-quality joint during extruding.The extrusion deformation degree of copper pipe and aluminum pipe and extruding number of times are the major parameters of cold welding when pushing like this, at every turn.
Evaporator of electric refrigerator copper-aluminum pipe cold welding technology, form by following several sections:
One, treats the processing of weldment
Will be processed into end face to be welded (as shown in Figure 1) with annealed copper pipe and aluminum pipe after chemical treatment before the welding, as can be seen from Figure 1, copper pipe end face to be welded has broken into groove along external diameter.With the metal surface of rotatable wire brush polishing weld zone, the little plug (see figure 2) made from hard-drawn aluminum wire after acetone or gasoline cleaning, is clipped with pliers and to be placed in copper pipe and the aluminum pipe; With the position of backstay location mandril in copper pipe.Copper pipe, aluminum pipe are put in the clamp of cold press welder (shown in Fig. 3 a), extract backstay out.
Two, Cold welding
Start cold press welder, clamp 2,4 clamping copper pipes 5, aluminum pipe 1, carry out the extruding first time.State after the extruding is shown in Fig. 3 b.Unclamp clamp, copper pipe, aluminum pipe position (making it be in the state of Fig. 3 a) are return and adjusted to extrusion oil cylinder.Clamp clamps copper pipe, aluminum pipe carries out the extruding second time and repeats extrusion process (generally repeating twice) for the second time.
Three, the thickening of faying face
Faying face thickening is promptly unclamped clamp and copper-aluminum pipe and is adjusted to state shown in Fig. 3 c; Be squeezed to the state shown in Fig. 3 d then.So far, cold welding process is over.
Four, weldment typing, cleaning
Unclamp clamp, take out the copper-aluminum pipe that welds, on drilling machine, get through plug with drill bit; With lathe excision " overlap ", the inside and outside metal fillings of scavenge pipe.
In the cold welding process parameter few, simple to operate, be easy to realize semi-automation or full-automatic.The size of clamp clamping force in the cold welding operation is not produced relative slip by welded tube spare and clamp during with extruding and is advisable.Therefore, the every equipment that can finish above-mentioned clamping, extruding work all can be selected for use, and special equipment is better certainly.
It is one of important parameter of cold welding that copper pipe, aluminum pipe stretch out the outer length (being extrusion deformation degree) of clamp, can select to stretch out the outer length of clamp according to caliber.Adopt following data generally speaking:
If D is copper pipe or aluminum pipe diameter, 1 is the extension elongation of copper pipe, adopts 1=3/5D usually; The extension elongation of aluminum pipe be 1/2～31(be the aluminum pipe extension elongation be the copper pipe extension elongation 1/2～2/3).1 value also can be done suitable adjustment according to tube wall thickness.Extension elongation is long, and tube wall unstability self is overlapping during extruding, forms dry joint; Extension elongation is too short, will make faying face place plastic deformation amount of flow deficiency, causes bond strength not enough.
Advantage of the present invention is, technology is simple, be easy to grasp, easy operating, joint quality are stable, reliable.Because welding parameter is few, action is simple, so be easy to realize semi-automation or automation.
Description of drawings
The schematic diagram of Fig. 1 copper pipe, aluminum pipe end face to be welded
D-copper pipe, aluminum pipe external diameter
D-copper pipe, aluminum pipe internal diameter
Fig. 2 mandrel structure schematic diagram
The mutual alignment figure of Fig. 3 a copper pipe, aluminum pipe, plug, clamp
1-aluminum pipe 2-decides clamp
3-plug 4-moves clamp
5-copper pipe 6-backstay
Fig. 3 b pushes back weldment state diagram for the first time
Weldment state diagram before Fig. 3 c extruding thickening layer
Weldment state diagram behind Fig. 3 d extruding thickening layer
Embodiment
With the cold press welder of special use or have clamping work pieces and other machinery of axial compression function, do with the program and the technical conditions of copper-aluminum pipe cold welding technology according to the evaporator of electric refrigerator that the present invention narrated, can implement the present invention.
Claims (7)
1, evaporator of electric refrigerator copper-aluminum pipe cold welding technology is as a whole with copper pipe and aluminum pipe weldering, it is characterized in that by treating that weldment processing, Cold welding, faying face are thickeied and four operations of weldment typing cleaning are formed.
2, the cold welding technology of narrating according to claim 1, it is characterized in that treating weldment handle be with annealed copper pipe, aluminum pipe carry out being processed into end face to be welded after the chemical treatment, wherein copper pipe breaks into groove along external diameter, with the wire brush polishing metal surface, weld zone of rotation, to form unsalted surface.
Make with hard-drawn aluminum wire, the front portion is the little plug of truncated cone-shaped, clips in insertion copper pipe and the aluminum pipe with pliers after solvent clean, decides the position of plug in copper pipe, aluminum pipe with backstay, copper pipe, aluminum pipe is put in the clamp of cold press welder, extracts backstay out.
3, the cold welding technology of narrating according to claim 1, start when it is characterized in that Cold welding cold press welder, with clamp clamp copper pipe, aluminum pipe carries out first time and pushes, unclamp clamp, return extrusion oil cylinder and adjust the copper-aluminum pipe position, carry out the extruding second time, repeat extrusion process for the second time again twice.
4, the cold welding technology of being narrated according to claim 1,3 is characterized in that the faying face thickening is to unclamp clamp and copper-aluminum pipe, extruding then.
5, the cold welding technology of narrating according to claim 2 is characterized in that the length that copper pipe stretches out clamp is 3/5 of copper pipe external diameter, and the length that aluminum pipe stretches out clamp is 1/2～2/3 of copper pipe extension elongation.
6, the cold welding technology of narrating according to claim 1 is characterized in that it is to unclamp clamp that the weldment integer is cleaned, and takes out the copper-aluminum pipe that welds, and aluminium leads to plug, and car deburring overlap washes the inside and outside metal fillings of pipe.
7, the cold welding technology of narrating according to claim 3, the size that it is characterized in that the clamping force of clamp the time is not produced relative slip by welded tube spare and clamp with extruding and is advisable, and the size of extruding force is advisable can be extruded into assigned address.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105055 CN1008242B (en) | 1988-04-14 | 1988-04-14 | Cu-al pipe-cold welding process for vapourizer of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105055 CN1008242B (en) | 1988-04-14 | 1988-04-14 | Cu-al pipe-cold welding process for vapourizer of refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN88105055A CN88105055A (en) | 1988-10-12 |
| CN1008242B true CN1008242B (en) | 1990-06-06 |
Family
ID=4833286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105055 Expired CN1008242B (en) | 1988-04-14 | 1988-04-14 | Cu-al pipe-cold welding process for vapourizer of refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1008242B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274389B (en) * | 2008-05-14 | 2010-06-09 | 佛山市顺德区三胜家电制造有限公司 | Copper-aluminum joint pressure welding technique |
| CN102528255A (en) * | 2010-12-31 | 2012-07-04 | 左铁军 | V-shaped face copper and aluminium welding processing technique and welding connector used for power cables |
| CN102489866B (en) * | 2011-12-09 | 2015-04-15 | 山东中大电力设备有限公司 | Cold pressure welding process for copper and aluminum |
| CN102962581B (en) * | 2012-12-13 | 2015-08-12 | 中国兵器工业第五二研究所 | The Cold welding method of deformation zinc alloy and copper alloy wire |
| CN104985317B (en) * | 2015-06-11 | 2017-05-24 | 上海交通大学 | Plastic connecting method of aluminum copper structure |
| CN106541206A (en) * | 2016-11-18 | 2017-03-29 | 绥阳县耐环铝业有限公司 | Evaporator of electric refrigerator Cu-AL pipe is colded pressing Welding |
| CN107127244A (en) * | 2017-06-23 | 2017-09-05 | 苏州西岩机械技术有限公司 | A kind of friction welding overlap removal device and friction welding machine |
| JP7265751B2 (en) * | 2019-02-19 | 2023-04-27 | 株式会社アスター | Method for manufacturing busbar joint |
| CN109822204B (en) * | 2019-03-01 | 2022-02-08 | 西安斯瑞先进铜合金科技有限公司 | Welding method for welding CuFe alloy material by cold pressing process |
| CN115007987A (en) * | 2022-06-01 | 2022-09-06 | 苏州方林科技股份有限公司 | Upsetting force butt-joint cold-pressure welding method |
-
1988
- 1988-04-14 CN CN 88105055 patent/CN1008242B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN88105055A (en) | 1988-10-12 |
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