CN102601509A

CN102601509A - Method for welding foam aluminum sandwich composite plate

Info

Publication number: CN102601509A
Application number: CN2012101004138A
Authority: CN
Inventors: 邓武
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2012-04-05
Filing date: 2012-04-05
Publication date: 2012-07-25

Abstract

The invention provides a method for welding a foam aluminum sandwich composite plate, which belongs to the technical field of welding of aluminum plates. The method includes steps: (1) fixing two face plates of the sandwich composite plate on electrodes; (2) placing a foam aluminum sandwich between the two face plates and attaching welded surfaces of the foam aluminum sandwich by means of exerting certain pressure; and (3) leading current to pass through the electrodes and flow through the two welded face plates and the welded foam aluminum sandwich, heating welded areas by resistance heat among the sandwich and the face plates, keeping the pressure and completing welding. The method for welding the foam aluminum sandwich composite plate has the advantages that a special material is omitted, the obtained composite plate is stable in performance, fine in environmental adaptation and low in welding cost, welding and heating time is short, heat is concentrated, a heat affected zone is small, performances of a base material are stable, follow-up heat treatment working procedures are omitted, and the method is simple in operation and convenient in implementation, labor intensity is low, and automation can be easily realized. The method can be widely popularized and applied.

Description

A kind of welding method of foamed aluminium sandwich composite board

Technical field

The present invention relates to the aluminium sheet welding field, specifically, particularly relate to the welding shaping method of a kind of foamed aluminium board as sandwich layer.

Background technology

Foamed aluminium board is after in fine aluminium or aluminium alloy, adding additive, to form through foam process, has metal and bubble characteristic simultaneously concurrently.Its density is little, highly absorb that impact capacity is strong, high temperature resistant, fire protecting performance is strong, anticorrosive, sound insulation and noise reduction, thermal conductivity is low, electromagnetic wave shielding is high, weatherability is strong, filter capacity is arranged, be prone to processing, be prone to install, the forming accuracy height, can carry out external coating.

At present, known foam aluminium sandwich has resin bonding method, method for brazing, second time of foaming method etc. with the mode that is fixedly connected between the panel.Wherein, resin bonding method material receives such environmental effects big, has the shortcoming of bonding agent easy ageing.Method for brazing, like the disclosed method of Chinese patent CN2000810018812.3, and the second time of foaming method etc., these method complex process, cost is higher.

Summary of the invention

To the problems referred to above, the present invention adopts the method for electric resistance welding to realize being connected between foam aluminium sandwich and the panel, does not introduce extra foreign material, has material settling out, the reliable advantage of technology.

The welding method of a kind of foamed aluminium sandwich composite board of the present invention may further comprise the steps:

1) two panels with sandwich composite board are fixed on the electrode;

2) foam aluminium sandwich is positioned in the middle of two panels, and applies certain pressure its solder side is fitted;

3) energising makes electric current passed through by electrode, and flows through two panels and foam aluminium sandwich plate that is soldered, and utilizes the resistance heat between battenboard and the panel that the weld zone is heated to mecystasis, keep-ups pressure then, accomplishes and welds.

The present invention also can do following improvement:

In the step 1), panel and electrode contact surface are coated with conductive paste, can reduce the contact resistance between panel and the electrode.

In the step 1), at first to remove on the panel oxide-film with electrode contact surface, can further reduce the contact resistance between panel and the electrode.

In the step 1), the method for removing oxide-film on the panel for brush with finer wire, at least a in the surperficial milling, can better reduce the contact resistance between panel and the electrode.

In the step 1); Also to remove the oxide-film of the contact-making surface on the panel and between the foam aluminium sandwich and increase surface roughness; Form point between the projection lines that makes panel surface and the cell wall of foam aluminium sandwich and contact the heat radiation when reducing welding, increase panel welding region current density; So that produce nugget at numerous contacting points positions, reach better welding effect.

In the step 1), handling with wire drawing increases the panel surface roughness.

Said electrode is a conductive fixture, and this conductive fixture is made up of last conductive fixture and following conductive fixture, and has the pressure of clamping.

In the welding process, through fixing lower clamp, anchor clamps reduce the distance between the lower clamp in the adjustment, and the local material fusing that overcomes the foamed aluminium weld zone welding pressure that causes that caves in reduces, and keeps welding pressure.

Compared with prior art, the beneficial effect that has of the present invention:

1) welding method of the present invention is not introduced foreign material, the composite plate stable performance of acquisition, good environmental adaptability.

2) welding method of the present invention is not used welding consumptive materials such as extra solder, argon gas, and welding cost is low.

3) welding method of the present invention, the weld heating time is short, and heat is concentrated, and the heat affected area is little, and substrate performance is stable, need not the subsequent heat treatment operation.

4) welding method of the present invention, energy efficiency is high, and noiseless does not produce harmful substance, energy-conserving and environment-protective.

5) welding method of the present invention is simple to operate, and it is convenient to implement, and labour intensity is low, easily is automated.

Description of drawings

Fig. 1 is a welding method sketch map of the present invention.

Sketch map is handled in the wire drawing of Fig. 2 panel.

Fig. 3 panel wire drawing treatment effect sketch map.

Among the figure: 1. go up conductive fixture, 2. panel, 3. foam aluminium sandwich 4. descends conductive fixture, 5. conductive paste, 6. pulling wheel.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further, but the present invention is not caused any restriction.A kind of welding method of foamed aluminium sandwich composite board may further comprise the steps:

1) cuts two blocks of aluminium sheets that are of a size of 200mmx50mmx5mm as panel 2, and the one side of panel 2 is carried out wire drawing with 60# pulling wheel 6 handle, form the even roughness surface, see Fig. 2 and Fig. 3; Use surperficial Milling Process mode afterwards again, remove the oxide-film of panel 2 another sides; Dip in absolute alcohol with Milling Process face wiped clean with clean cotton yarn then, after the drying, apply the thick conductive paste 5 of 0.2mm; Two panels 2 to handling well at last are fixed on the conductive fixture behind the cleaning, drying, fix, and guarantee that the face and the conductive fixture of coating electrically conductive cream 5 fits tightly;

2) size that block foam aluminium is slit into 200mmx50mmx20mm with line is as foam aluminium sandwich 3, and with these foam aluminium sandwich 3 rust cleaning oven dry of deoiling; Subsequently foam aluminium sandwich 3 is placed in the middle of the panel 2,, its solder side is fitted like Fig. 1 by last conductive fixture 1 welding pressure of exerting pressure;

3) large power supply of use adjustable power passes to electric current to conductive fixture, under strong standard, accomplishes welding; In the welding process; Last conductive fixture 4 servo-actuateds are exerted pressure, and it is stable to keep welding pressure, utilizes the resistance heat between battenboard 3 and the panel 2 that the weld zone is heated to mecystasis; Keep-up pressure then, accomplish welding.Said servo-actuated is exerted pressure to passing through fixedly lower clamp, and anchor clamps reduce the distance between the lower clamp in the adjustment, and the local material that overcomes the foamed aluminium weld zone melts the welding pressure that causes that caves in and reduces, and keeps welding pressure.

After having welded, take off the sandwich composite board of accomplishing welding, remove the conductive paste 5 of panel 2 outer surfaces.

Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.

Claims

1. the welding method of a foamed aluminium sandwich composite board is characterized in that may further comprise the steps:

1) two panels (2) with sandwich composite board are fixed on the electrode;

2) foam aluminium sandwich (3) is positioned in the middle of two panels (2), and applies certain pressure its solder side is fitted;

3) energising makes electric current passed through by electrode, and flows through two panels (2) and the foam aluminium sandwich (3) that is soldered, and utilizes the resistance heat between battenboard and the panel that the weld zone is heated to mecystasis, keep-ups pressure then, accomplishes welding.

2. the welding method of foamed aluminium sandwich composite board according to claim 1 is characterized in that: in the step 1), panel (2) is coated with conductive paste (5) with electrode contact surface.

3. the welding method of foamed aluminium sandwich composite board according to claim 2 is characterized in that: in the step 1), at first will remove on the panel (2) and the oxide-film of electrode contact surface.

4. the welding method of foamed aluminium sandwich composite board according to claim 3 is characterized in that: in the step 1), remove method that panel (2) goes up oxide-film for brush with finer wire, at least a in the surperficial milling.

5. the welding method of foamed aluminium sandwich composite board according to claim 1 is characterized in that: in the step 1), to remove also that panel (2) is gone up and foam aluminium sandwich (3) between contact-making surface oxide-film and increase surface roughness.

6. the welding method of foamed aluminium sandwich composite board according to claim 5 is characterized in that: in the step 1), handling with wire drawing increases panel (2) surface roughness.

7. according to the welding method of each described foamed aluminium sandwich composite board among the claim 1-6, it is characterized in that: said electrode is a conductive fixture, and this conductive fixture is made up of last conductive fixture (1) and following conductive fixture (4), and has the pressure of clamping.

8. the welding method of foamed aluminium sandwich composite board according to claim 7 is characterized in that: in the welding process, through fixing lower clamp, anchor clamps reduce the distance between the lower clamp in the adjustment, keep welding pressure.