CN212599791U

CN212599791U - Paste-free brazing combined solder

Info

Publication number: CN212599791U
Application number: CN202021224717.1U
Authority: CN
Inventors: 周知音
Original assignee: Shanghai Yihe Automobile Technology Co Ltd
Current assignee: Shanghai Yihe Automobile Technology Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-02-26
Anticipated expiration: 2030-06-29

Abstract

The utility model relates to the technical field of soldering paste-free soldering, in particular to a soldering paste-free soldering combined solder, which comprises a solid solder and a metal foil coated outside the solid solder; the metal foil is of an integral structure, the material of the metal foil is the same as that of the solid brazing filler metal, the solid brazing filler metal is of a spherical structure, a cylindrical structure or an olive-shaped structure, and the metal foil is of a sheet structure, a strip structure or a cross-shaped structure. The utility model discloses a metal foil piece with by the laminating of weld metal, make it play the drainage effect at the brazing in-process, guarantee brazing material's homodisperse, improved welding quality, simplified process flow, easy operation, the failure rate is low, energy-concerving and environment-protective.

Description

Paste-free brazing combined solder

Technical Field

The utility model relates to a no soldering paste technical field that brazes especially relates to a no soldering paste combination solder that brazes.

Background

Brazing refers to a welding method in which brazing filler metal lower than the melting point of a weldment and the weldment are heated to the melting temperature of the brazing filler metal at the same time, and then the liquid brazing filler metal is used for filling gaps of solid workpieces to connect metals.

The specific process is as follows: the method comprises the steps of assembling the workpieces with cleaned surfaces together in a lap joint mode, placing brazing filler metal near or between joint gaps, heating the workpieces and the brazing filler metal to a temperature slightly higher than the melting point of the brazing filler metal, then melting the brazing filler metal (the workpieces are not melted) and sucking and filling the brazing filler metal into the gaps between the solid workpieces through capillary action, mutually diffusing and dissolving the liquid brazing filler metal and the workpieces, and condensing to form the brazed joint.

At present, because the difference exists between the mass production process and the theoretical condition, the surface flatness and the surface cleanliness of mass-produced brazing workpieces are unstable, and in order to improve the brazing quality under the mass production condition, before brazing, paste-shaped base brazing filler metal is usually coated at the crack of the welding workpieces so as to ensure that the dispersion area of the molten metal brazing filler metal meets the product requirement. And the paste brazing filler metal is used for assisting welding, so that the material is consumed, manual operation is required under the condition of a slightly complex product, the operation cost is improved, and the reliability is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a combined solder without soldering paste and brazing.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a combined solder without soldering paste for soldering comprises a solid solder and a metal foil coated on the outer side of the solid solder; the metal foil is of an integral structure, and the material of the metal foil is the same as that of the solid brazing filler metal.

Preferably, the solid brazing filler metal has a spherical structure, a cylindrical structure or an olive-shaped structure.

Preferably, the metal foil is of a sheet structure, the middle part of the metal foil covers the upper side of the solid brazing filler metal, and the edge of the metal foil extends outwards.

Preferably, the metal foil is of a strip structure, the middle section of the metal foil is coated on the upper side of the solid brazing filler metal, and two ends of the metal foil extend outwards.

Preferably, the metal foil is in a cross-shaped structure and comprises a section a and a section b which are perpendicular to each other, the intersection of the section a and the section b of the metal foil is arranged on the top of the solid brazing filler metal and covers the upper side of the solid brazing filler metal, and two ends of the section a and the section b of the metal foil extend outwards.

The utility model has the advantages that:

1. the utility model discloses a metal foil piece with by the laminating of weld metal, make it play the drainage effect at the brazing in-process, overcome among the current brazing process shortcoming that capillary action easily receives influences such as workpiece surface cleanliness, work piece roughness, welding area, guarantee brazing material's homodisperse, improved welding quality.

2. The utility model discloses simplified process flow, need not add the viscidity soldering paste by the manual work, easy operation, the failure rate is low, and is energy-concerving and environment-protective.

Drawings

FIG. 1 is an assembly view of a solderless brazing combination solder according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a solderless brazing composite solder according to the present invention;

FIG. 3 is a schematic view of a metal foil structure according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second embodiment of a non-solder-paste brazing composite solder according to the present invention;

FIG. 5 is a schematic view of a second metal foil structure according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a solder paste-free brazing combined solder according to an embodiment of the present invention;

fig. 7 is a schematic view of a three-metal foil structure of an embodiment of a combined solder for paste-free soldering according to the present invention.

In the figure:

1-upper workpiece, 2-lower workpiece, 3-brazing hole, 4-solid brazing filler metal and 5-metal foil.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, a combined solder without solder paste brazing includes a solid solder 4, and a metal foil 5 coated outside the solid solder 4;

the material of the metal foil 5 is the same as that of the solid brazing material 4.

Wherein, the solid brazing filler metal 4 is of a spherical structure, a cylindrical structure or an olive-shaped structure matched with the brazing holes 3.

A fluxless brazing process comprising the steps of:

s1, processing a brazing hole 3 in the center of the welding surface of the upper workpiece 1 to be brazed;

s2, processing the metal foil 5 to integrally form;

s3, coating the metal foil 5 on the outer side of the solid brazing filler metal 4 to form combined brazing filler metal, and inlaying the combined brazing filler metal into the brazing hole 3 to enable the metal foil 5 to be attached to the lower surface of the upper workpiece 1;

s4, combining and fixing the upper workpiece 1 inlaid with the combined solder and the corresponding lower workpiece 2, and putting the upper workpiece and the corresponding lower workpiece into a brazing furnace for heating;

and S5, melting the combined solder in a brazing furnace, filling the gaps of the workpieces to form a brazing joint, and completing the welding of the upper workpiece 1 and the lower workpiece 2.

Wherein, the metal foil 5 is integrally processed and formed by adopting a stamping process; when the combined solder is melted in the furnace, the melted metal foil 5 exists in the gaps among the workpieces, so that the capillary action is strengthened, and the solid solder 4 can be helped to quickly and uniformly fill the gaps among the workpieces.

The first embodiment is as follows: referring to fig. 2 and 3, the metal foil 5 has a sheet structure, the middle of the metal foil 5 is coated on the upper side of the solid brazing filler metal 4, the edge of the metal foil 5 extends outward, and after the metal foil 5 is embedded, the edge of the metal foil extends out of the brazing hole 3 and is attached to the lower surface of the upper workpiece 1.

Example two: referring to fig. 4 and 5, the metal foil 5 has a strip structure, the middle section of the metal foil 5 is coated on the upper side of the solid solder 4, two ends of the metal foil 5 extend outwards, and after the metal foil 5 is embedded, two ends of the metal foil 5 extend out of the soldering hole 3 and are attached to the lower surface of the upper workpiece 1.

Example three: referring to fig. 6 and 7, the metal foil 5 is in a cross-shaped structure and comprises a section a and a section b which are perpendicular to each other, the intersection of the section a and the section b of the metal foil 5 is placed on the top of the solid brazing filler metal 4 and covers the upper side of the solid brazing filler metal, two ends of the section a and the section b of the metal foil 5 extend outwards, and after the metal foil 5 is embedded, the two ends of the section a and the section b of the metal foil 5 extend out of the brazing hole 3 and are attached to the lower surface of the upper workpiece 1.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The combined solder for the solderless soldering is characterized by comprising solid solder (4) and metal foil (5) coated on the outer side of the solid solder (4);

the metal foil (5) is of an integral structure, and the material of the metal foil (5) is the same as that of the solid brazing filler metal (4).

2. The paste-free brazing composite solder according to claim 1, wherein the solid brazing filler metal (4) has a spherical structure, a cylindrical structure or an olive-shaped structure.

3. A paste-free brazing composite solder according to claim 1 or 2, wherein the metal foil (5) is a sheet-like structure, and the metal foil (5) is coated on the upper side of the solid brazing filler metal (4) at the middle part and extends outwards at the edge.

4. The combined solder for fluxless soldering according to claim 1 or 2, wherein the metal foil (5) has a strip structure, and the middle section of the metal foil (5) covers the upper side of the solid solder (4) and both ends of the metal foil extend outwards.

5. The combined solder for fluxless soldering according to claim 1 or 2, wherein the metal foil (5) has a cross-shaped structure including a segment a and a segment b perpendicular to each other, the segment a and the segment b of the metal foil (5) intersect and are disposed on top of the solid solder (4) and cover the upper side thereof, and both ends of the segment a and the segment b of the metal foil (5) extend outward.