Brazing method and brazing filler metal adding device

Abstract

The invention discloses a brazing method and a brazing filler metal adding device. The brazing method comprises the following steps that at least two workpieces to be welded make contact to form a joint; liquid brazing filler metal is added to the joint through a brazing filler metal adding device, the brazing filler metal adding device comprises a feeding channel and a heating mechanism used for heating the brazing filler metal in the feeding channel, the heating mechanism heats the brazing filler metal in the feeding channel to be in a liquid state, and the liquid brazing filler metal is added to the joint through a discharging port of the feeding channel; and the welding heating equipment is adopted for conducting brazing operation on the at least two workpieces to be welded, so that brazing seams are formed in the joints. According to the technical scheme, the problem that the brazing work efficiency is low can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of brazing processing, and in particular to a brazing method and a brazing material adding device. Background Art

[0002] At present, for the brazing industry, for example, in the brazing of air conditioning pipeline components in the refrigeration industry, automatic wire feeding combined with heating brazing is usually used. Specifically, the workpiece to be welded is first heated to a preset temperature (melting temperature of the brazing material), and then the brazing material is transported to the surface of the workpiece to be welded by an automatic wire feeding mechanism. After the brazing material contacts the surface of the workpiece to be welded, it melts and flows, and fills the gap between the joints to form a weld. Therefore, it is necessary to heat the workpiece to be welded to a preset temperature before the wire feeding action can be performed. There is a problem of waiting for wire feeding, which leads to low efficiency of brazing work. Summary of the invention

[0003] The main purpose of the invention is to provide a brazing method, aiming to improve the problem of low brazing efficiency.

[0004] To achieve the above object, the present invention provides a brazing method, comprising the following steps:

[0005] contacting at least two workpieces to be welded to form a joint;

[0006] A solder adding device is used to add liquid solder to the joint, the solder adding device comprises a feeding channel and a heating mechanism for heating the solder in the feeding channel, the heating mechanism heats the solder in the feeding channel to a liquid state, and the liquid solder is added to the joint through the outlet of the feeding channel;

[0007] A welding heating device is used to perform a brazing operation on the at least two workpieces to be welded, so that a brazing seam is formed at the joint.

[0008] In one embodiment of the present invention, a solder adding device is used to add liquid solder to the joint, and the welding heating device is used to braze the at least two workpieces to be welded, and the amount of liquid solder added is adjusted in real time during the brazing process.

[0009] In one embodiment of the present invention, after the step of "adding liquid solder at the joint through the outlet of the feeding channel", the method further includes:

[0010] The liquid solder contacts air at the joint to form a solder preform.

[0011] In one embodiment of the present invention, the step of "using a welding heating device to perform a brazing operation on the at least two workpieces to be welded" includes:

[0012] The soldering heating device is used to heat the prefabricated solder so that the prefabricated solder is melted to form the soldering seam at the joint.

[0013] In one embodiment of the present invention, before the step of "using a solder adding device to add liquid solder to the joint", the method further includes:

[0014] A driving mechanism is used to drive the solder adding device to move so that the discharge port of the feeding channel corresponds to the joint.

[0015] In one embodiment of the present invention, the step of "adding liquid solder at the joint through the outlet of the feeding channel" includes:

[0016] The feeding channel is filled with a protective gas so that the liquid solder drips from the discharge port of the feeding channel to the joint under the action of gravity and the protective gas.

[0017] The present invention also provides a solder adding device applied to the above-mentioned soldering method, the solder adding device comprising:

[0018] A heating device, provided with a heating mechanism and a feeding channel, wherein the discharge port of the feeding channel is arranged toward a joint between at least two workpieces to be welded;

[0019] The wire feeding mechanism is provided with a wire feeding nozzle, the outlet of the wire feeding nozzle is connected with the inlet of the feeding channel, the wire feeding nozzle conveys solder to the feeding channel, the heating mechanism heats the solder in the feeding channel to melt the solder in the feeding channel into liquid solder, and the liquid solder drips from the outlet of the feeding channel to the joint.

[0020] In one embodiment of the present invention, the heating mechanism further comprises a high temperature resistant protective cover, which is disposed on the heating element and is provided with the feeding channel.

[0021] In one embodiment of the present invention, the high temperature resistant protective cover is provided with a protective gas filling nozzle connected to the feeding channel.

[0022] In one embodiment of the present invention, the high temperature resistant protective cover comprises:

[0023] A protective gas filling section, wherein a feed port of the protective gas filling section is connected to a feed port of the wire feeding nozzle, a first channel is formed in the protective gas filling section, and the protective gas filling section is provided with the protective gas filling nozzle connected to the first channel;

[0024] A heating section is connected to the protective gas filling section and is arranged on the heating mechanism. A second channel connected to the first channel is formed in the heating section. The first channel and the second channel constitute the feeding channel. The heating mechanism heats the solder in the second channel. The outlet of the second channel is used to be arranged toward the joint.

[0025] In one embodiment of the present invention, a conveying pipe is provided in the second channel, the feed port of the conveying pipe is connected to the discharge port of the first channel, and the discharge port of the conveying pipe is connected to the discharge port of the second channel.

[0026] In one embodiment of the present invention, the high temperature resistant protective cover further comprises a guide nozzle, which is arranged at the discharge end of the heating section and is used to guide the liquid solder flowing out of the discharge port of the feeding channel to the joint.

[0027] In the brazing method proposed in the present invention, at least two workpieces to be welded are first brought into contact to form a joint; then a brazing material adding device is used to add liquid brazing material to the joint, specifically, firstly, a brazing material with a preset wire feeding length is fed into a feeding channel; a heating mechanism heats the brazing material in the feeding channel to melt the brazing material in the feeding channel into liquid brazing material; then liquid brazing material is added to the joint through the discharge port of the feeding channel; and at the same time, a welding heating device is used to perform brazing operations on at least two workpieces to be welded, so that a brazing seam can be formed at the joint.

[0028] Therefore, adding liquid solder is arranged as a front-end process of brazing heating, and is carried out separately and simultaneously with brazing heating. There is no need to heat the workpiece to be welded to a preset temperature before feeding the wire, which causes the problem of waiting for wire feeding. This can effectively improve the problem of low brazing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of a solder adding device of the present invention;

[0031] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0032] Figure 3 The figure is a flow chart of an embodiment of the brazing method of the present invention.

[0033] Description of Figure Numbers:

[0034] Label name Label name 100 Brazing material adding device 23 Guide nozzle 10 Heating device 20a Feeding channel 11 Heating mechanism 20a1 First Channel 12 Power supply structure 20a2 Second channel 20 High temperature protection cover 30 Wire feeding mechanism 21 Protective gas filling section 31 Wire feed nozzle 211 Protective gas nozzle 200 Brazing material 22 Heating section 300 Workpiece to be welded 221 Delivery pipe

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The invention provides a brazing method, aiming to improve the problem of low brazing efficiency.

[0040] Combined with reference Figure 3 The present invention provides a brazing method, which comprises the following steps:

[0041] S10, contacting at least two workpieces 300 to be welded to form a joint; specifically, the at least two workpieces 300 to be welded can be contacted manually to form a joint; or, at least two workpieces 300 to be welded can be contacted by a clamping mechanism or other equipment to form a joint; the clamping mechanism belongs to the prior art and will not be described in detail here.

[0042] S20, liquid solder is added to the joint using a solder adding device 100, the solder adding device 100 includes a feeding channel 20a and a heating mechanism 11 for heating the solder 200 in the feeding channel 20a, the heating mechanism 11 heats the solder 200 in the feeding channel 20a to a liquid state, and liquid solder is added to the joint through the outlet of the feeding channel 20a; specifically, solder 200 of a preset wire feeding length can be delivered to the wire feeding channel 20a manually or using equipment such as a wire feeding mechanism 30; the wire feeding mechanism 30 belongs to the prior art and will not be described in detail here.

[0043] In some embodiments, the amount of solder added at a single time can be precisely controlled by equipment such as the wire feeding mechanism 30 according to parameters such as a preset wire feeding length or a preset wire feeding speed.

[0044] In actual application, the heating structure 11 can specifically heat the solder 200 in the feeding channel 20a by means of an induction heating coil, flame, laser, etc.

[0045] S30, using a welding heating device to perform a brazing operation on at least two workpieces to be welded 300, so that a brazing seam is formed at the joint. Specifically, the welding heating device can perform the brazing operation by means of an induction heating coil, a flame, a laser, etc., so that a brazing seam is formed at the joint. The welding heating device belongs to the prior art and will not be described in detail here.

[0046] It can be understood that in the brazing method proposed in the present invention, at least two workpieces 300 to be welded are first brought into contact to form a joint; then a brazing material adding device 100 is used to add liquid brazing material to the joint. Specifically, a brazing material 200 with a preset wire feeding length is first conveyed into the feed channel 20a of the heating device 10; the heating mechanism 10 heats the brazing material 200 in the feed channel 20a to melt the brazing material 200 in the feed channel 20a into liquid brazing material; then liquid brazing material is added to the joint through the discharge port of the feed channel 20a; and at the same time, a welding heating device is used to perform brazing operations on at least two workpieces 300 to be welded, so that a brazing seam can be formed at the joint.

[0047] Therefore, adding liquid solder is arranged as a front-end process of brazing heating, and is carried out separately and simultaneously with brazing heating. There is no need to heat the workpiece 300 to a preset temperature before feeding the wire, which causes the problem of waiting for wire feeding. This can effectively improve the problem of low brazing efficiency.

[0048] In actual application, when liquid brazing material is added to the joint through the discharge port of the feed channel 20a, the welding heating device can directly braze the liquid brazing material at the joint to achieve the brazing operation of at least two workpieces 300 to be welded; or, when liquid brazing material is added to the joint through the discharge port of the feed channel 20a, the liquid brazing material can be solidified into prefabricated brazing material, and then the prefabricated brazing material at the joint can be brazed by the welding heating device to achieve the brazing operation of at least two workpieces 300 to be welded.

[0049] Furthermore, in one embodiment of the brazing method of the present invention, a brazing material adding device 100 is used to add liquid brazing material to the joint, and a welding heating device is used to braze at least two workpieces 300 to be welded, and the amount of liquid brazing material added is adjusted in real time during the brazing process.

[0050] Such an arrangement allows the solder to be in liquid state when added, and there is no need to melt the solder during brazing, thereby saving the energy consumption required to heat the solder during brazing. At the same time, the simultaneous operation of the two processes of solder addition and brazing can improve the brazing efficiency of the workpiece 300 to be welded, and meet the rhythm requirements of automated brazing.

[0051] In addition, during the brazing operation, the amount of brazing material added can be adjusted in real time according to the brazing situation, so as to avoid excessive addition of brazing material and cause waste while meeting the brazing quality. The specific real-time adjustment scheme is exemplified as follows. In general, the amount of brazing material added can be set to a preset value according to actual operation experience. On this basis, a visual inspection module such as a CCD camera is added to monitor the brazing seam to feedback the brazing quality. After that, the corresponding control module controls the brazing material adding device 100 to adjust the amount of brazing material added in real time. The specific control scheme of detecting the brazing seam through the visual inspection module and performing feedback adjustment belongs to a mature control technology and will not be described in detail here.

[0052] Furthermore, in another embodiment of the brazing method of the present invention, after the step of "adding liquid brazing material to the joint through the outlet of the feeding channel 20a", the method further includes:

[0053] The liquid solder contacts the air at the joint to form a solder preform.

[0054] With such a configuration, when liquid solder is added to the joint through the outlet of the feeding channel 20a, the liquid solder contacts the air and quickly cools and solidifies, and adheres to the joint to form a prefabricated solder, which can ensure that the solder adheres to the joint quickly to avoid the phenomenon of liquid solder dripping. In addition, the configuration of the prefabricated solder can facilitate modular operation, meet the scene where it is inconvenient to perform real-time brazing or the scene with low automation requirements, thereby making the brazing operation more adaptable.

[0055] Furthermore, in one embodiment of the brazing method of the present invention, the step of “using a welding heating device to perform a brazing operation on at least two workpieces 300 to be welded” includes:

[0056] , the prefabricated solder is heated by welding heating equipment so that the prefabricated solder is melted to form a brazing seam at the joint.

[0057] In this configuration, the prefabricated solder is heated by using a welding heating device so that a more uniform brazing seam can be formed at the joint after the prefabricated solder is heated and melted, thereby achieving a brazing operation of at least two workpieces 300 to be welded.

[0058] Furthermore, in one embodiment of the brazing method of the present invention, before the step of "using the brazing material adding device 100 to add liquid brazing material to the joint", the method further includes:

[0059] The driving mechanism is used to drive the solder adding device 100 to move so that the discharge port of the feeding channel 20a corresponds to the joint.

[0060] In this way, by installing the solder adding device 100 on a driving mechanism (not shown), the solder adding device 100 can be automatically moved to the joint between at least two workpieces 300 to be welded under the drive of the driving mechanism, so that the outlet of the feeding channel 20a corresponds to the joint, thereby achieving accurate and automatic addition of solder to the joint, avoiding the problems of inefficiency and uncontrolled addition accuracy caused by manual operation.

[0061] In actual application, the driving mechanism may be a robot or an automatic moving servo mechanism, as long as it can automatically drive the solder adding device to move, and no specific limitation is made here.

[0062] Further, in one embodiment of the brazing method of the present invention, the step of "adding liquid brazing material to the joint through the outlet of the feeding channel 20a" includes:

[0063] The shielding gas is filled into the feeding channel 20a so that the liquid solder drips from the outlet of the feeding channel 20a to the joint under the action of gravity and the shielding gas.

[0064] In this way, a protective gas is filled into the feeding channel 20a, so that the liquid solder in the feeding channel 20a can drip more smoothly to the joint between at least two workpieces 300 to be welded under the dual effects of its own gravity and the filled protective gas, and the dripping amount of the liquid solder can be accurately controlled.

[0065] Combined with reference Figure 1 and Figure 2The present invention also proposes a solder adding device 100 applied to the brazing method as described above, the solder adding device 100 includes a heating device 10 and a wire feeding mechanism 30; the heating device 10 is provided with a heating mechanism 11 and a feeding channel 20a, the discharge port of the feeding channel 20a is used to be arranged toward the joint between at least two workpieces 300 to be welded; the wire feeding mechanism 30 is provided with a wire feeding nozzle 31, the discharge port of the wire feeding nozzle 31 is connected with the feed port of the feeding channel 20a, the wire feeding nozzle 31 conveys the solder 200 to the feeding channel 20a, the heating mechanism 11 heats the solder 200 in the feeding channel 20a, so that the solder 200 in the feeding channel 20a is melted into liquid solder, and the liquid solder drips from the discharge port of the feeding channel 20a to the joint.

[0066] It can be understood that in the solder adding device 100 proposed in the present invention, the solder 200 of a preset wire feeding length is delivered to the feeding channel 20a through the wire feeding nozzle 31 of the wire feeding mechanism 30; the heating mechanism 11 heats the solder 200 in the feeding channel 20a to melt the solder 200 in the feeding channel 20a into liquid solder; the liquid solder will drip from the discharge port of the feeding channel 20a to the joint under the action of gravity and / or protective gas; at the same time, a welding heating device is used to perform brazing operation on at least two workpieces 300 to be welded, so that a brazing seam can be formed at the joint.

[0067] Therefore, the brazing material adding device 100 is arranged in the front process of brazing heating, and is carried out separately and simultaneously with the brazing heating. There is no need to heat the workpiece 300 to a preset temperature before feeding the wire, which causes the problem of waiting for wire feeding. This can effectively improve the problem of low brazing efficiency.

[0068] In some embodiments, the solder adding device 100 and the welding heating equipment can be processing equipment on the same production line. Specifically, the solder adding device 100 forms prefabricated solder at the joint between at least two workpieces 300 to be welded in the form of molten droplets, and then the prefabricated solder at the joint is heated and melted by the welding heating equipment, so that a firm brazing seam can be formed at the joint.

[0069] Furthermore, the amount of solder 200 added in a single molten droplet is precisely controlled by the wire feeding mechanism 30 according to parameters such as a preset wire feeding length or a preset wire feeding speed.

[0070] The present solution proposes that the solder adding device 100 can be specifically installed on a driving mechanism such as a robot or an automatic moving servo mechanism to accurately and automatically add solder 200 to the joint between at least two workpieces 300 to be welded, avoiding problems such as low efficiency and uncontrolled addition accuracy caused by manual operation.

[0071] In actual application, the heating structure 11 can specifically heat the solder 200 in the feeding channel 20a by means of induction heating coils, flames, lasers, etc., as long as it can melt the solder 200 in the feeding channel 20a to form liquid solder, and no specific limitation is made here.

[0072] In actual application, the specific form of the solder 200 delivered from the wire feeding nozzle 31 can be solid solder 200 in the form of wire, paste, powder, sheet, granule, etc.

[0073] In some embodiments, the solder 200 can be in the form of a filamentary solid solder 200. For example, the solder 200 is a welding wire. Then, the welding wire is fed to the wire feeding mechanism 30 in the form of a disc-shaped welding wire, and then the welding wire is continuously fed into the feeding channel 20a through the wire feeding nozzle 31 of the wire feeding mechanism 30.

[0074] In actual application, the liquid solder in the wire feeding channel can drip onto the joint surface of the workpiece 300 to be welded only under the action of its own gravity; or a shielding gas can be filled into the feeding channel 20a so that the liquid solder can drip onto the joint under the dual action of gravity and shielding gas.

[0075] Further, see Figure 1 and Figure 2 In one embodiment of the solder adding device 100 of the present invention, the heating mechanism further includes a high temperature resistant protective cover 20, which is disposed on the heating mechanism 11 and is provided with a feeding channel 20a.

[0076] With such arrangement, the design of the high temperature resistant protective cover 20 can transfer the heat to the solder 200 in the feeding channel 20a through the high temperature resistant protective cover 20 when the heating mechanism 11 generates heat, so as to melt the solder 200, and at the same time, the molten liquid solder can only drip out through the discharge port of the feeding channel 20a, thereby protecting the liquid solder and preventing the liquid solder from leaking from other locations.

[0077] In actual application, the high temperature resistant protective cover 20 can be specifically set on one side of the heating mechanism 11, or can be set above the heating mechanism 11, or can be set below the heating mechanism 11, or can be passed through the heating mechanism 11, as long as it can heat the solder 200 in the feeding channel 20a when the heating mechanism 11 generates heat, and no specific limitation is made here.

[0078] In actual application, the end face of the wire feeding nozzle 31 where the material outlet is located can be directly abutted against the end face of the material feed port of the high temperature resistant protective cover 20, or it can be connected by bonding, adsorption, welding, etc., so that the wire feeding nozzle 31 can smoothly transport the solder 200 into the feeding channel 20a.

[0079] Further, see Figure 1 and Figure 2 In one embodiment of the solder adding device 100 of the present invention, the high temperature resistant protective cover 20 is provided with a protective gas filling nozzle 211 connected to the feeding channel 20a.

[0080] With this arrangement, protective gas is filled into the feeding channel 20a through the protective gas filling nozzle 211, so that the liquid solder in the feeding channel 20a can drip toward the joint more smoothly under the dual effects of its own gravity and the filling protective gas, and the dripping amount of the liquid solder can be accurately controlled.

[0081] In some embodiments, in order to prevent the liquid solder from clogging the protective gas nozzle 211, the protective gas nozzle 211 can be set above the high temperature protection cover 20 or on the side away from the discharge port of the feeding channel 20a.

[0082] Further, see Figure 2 In one embodiment of the solder adding device 100 of the present invention, the high temperature resistant protective cover 20 includes a protective gas filling section 21 and a heating section 22; the feed port of the protective gas filling section 21 is connected to the discharge port of the wire feeding nozzle 31, a first channel 20a1 is formed in the protective gas filling section 21, and the protective gas filling section 21 is provided with a protective gas filling nozzle 211 connected to the first channel 20a1; the heating section 22 is connected to the protective gas filling section 21 and is arranged on the heating mechanism 11, a second channel 20a2 connected to the first channel 20a1 is formed in the heating section 22, the first channel 20a1 and the second channel 20a2 constitute a feeding channel 20a, the heating mechanism 11 heats the solder 200 in the second channel 20a2, and the discharge port of the second channel 20a2 is used to be arranged toward the joint.

[0083] In this arrangement, when the wire feeding nozzle 31 conveys the solder 200 to the feeding channel 20a, the solder 200 first enters the first channel 20a1 of the protective gas filling section 21, and then enters the second channel 20a2 of the heating section 22, so that the solder 200 in the second channel 20a2 is heated by the heating mechanism 11, so that the solder 200 in the second channel 20a2 is melted into liquid solder; at the same time, the protective gas is filled into the first channel 20a1 through the protective gas filling nozzle 211, so that the protective gas flows to the second channel 20a2 through the first channel 20a1, so that the liquid solder in the second channel 20a2 can drip to the joint more smoothly under the dual effects of its own gravity and the protective gas. In addition, by setting the protective gas filling nozzle 211 in the protective gas filling section 21, it can be better to avoid the melted liquid solder blocking the protective gas filling nozzle 211, or even flowing out from the protective gas filling nozzle 211.

[0084] In some embodiments, the protective gas filling section 21 and the heating section 22 may be an integrally formed structure, which can not only ensure a sealed connection between the protective gas filling section 21 and the heating section 22 but also reduce the preparation process.

[0085] In actual application, the inner diameter of the first channel 20a1 may be consistent with or inconsistent with the inner diameter of the second channel 20a2, as long as the solder 200 passing through the first channel 20a1 can smoothly enter the second channel 20a2, and no specific limitation is made here.

[0086] Further, see Figure 2 In one embodiment of the solder adding device 100 of the present invention, a delivery pipe 221 is provided in the second channel 20a2, the feed port of the delivery pipe 221 is connected to the discharge port of the first channel 20a1, and the discharge port of the delivery pipe 221 is connected to the discharge port of the second channel 20a2.

[0087] In this way, by providing the delivery pipe 221 in the second channel 20a2, the liquid solder can be more smoothly delivered to the discharge port of the second channel 20a2 under the action of the delivery pipe 221, so as to drip smoothly to the joint.

[0088] In actual application, the delivery tube 221 can be fixed in the second channel 20a2 by interference fit, bonding, screw connection, etc. to ensure the installation stability of the delivery tube 221 and prevent the delivery tube 221 from falling out of the second channel 20a2 during use, thereby affecting the service life.

[0089] Further, see Figure 2 In one embodiment of the solder adding device 100 of the present invention, the high temperature resistant protective cover 20 also includes a guide nozzle 23, which is arranged at the discharge end of the heating section 22 and is used to guide the liquid solder flowing out of the discharge port of the feeding channel 20a to the joint.

[0090] In this way, by providing a guide nozzle 23 at the discharge end of the heating section 22, the liquid solder can be smoothly guided to the joint under the action of the guide nozzle 23, so that the liquid solder can better form a prefabricated solder at the joint. In addition, since the liquid solder will quickly cool and solidify when it contacts the air, the position of the discharge port of the guide nozzle 23 is easy to contact the air. Therefore, after long-term use, the solidified solder 200 is easily blocked in the guide nozzle 23. In this way, the guide nozzle 23 can be directly replaced without replacing the entire high-temperature protection cover 20, thereby reducing maintenance costs.

[0091] In actual application, the guide nozzle 23 can be connected to the discharge end of the heating section 22 by welding, bonding, screw connection, etc. to ensure the installation stability of the guide nozzle 23.

[0092] Further, see Figure 2 In one embodiment of the solder adding device 100 of the present invention, the end surface of the guide nozzle 23 where the discharge port is located is an arc surface.

[0093] In this arrangement, since the joint surface between at least two workpieces 300 to be welded is usually an arc surface, by designing the end face of the guide nozzle 23 where the discharge port is located to be an arc surface, the end face of the guide nozzle 23 where the discharge port is located can be better matched with the joint surface, so that the liquid solder dripping from the guide nozzle 23 can better form prefabricated solder at the joint.

[0094] Further, see Figure 1 and Figure 2 In one embodiment of the solder adding device 100 of the present invention, the heating mechanism 11 is an induction heating coil.

[0095] With such a configuration, the solder 200 in the feeding channel 20a is heated by using an induction heating coil, which not only can heat the solder 200 in the feeding channel 20a more evenly, but also is safer and more environmentally friendly than heating by flame or laser.

[0096] In some embodiments, the induction heating coil may be wound around the high temperature resistant protective cover 20 , so that the induction heating coil may heat the solder 200 in the feeding channel 20 a more uniformly.

[0097] Further, see Figure 1 and Figure 2 In one embodiment of the solder adding device 100 of the present invention, the heating device 10 further includes a power supply structure 12, and the power supply structure 12 is electrically connected to the induction heating coil.

[0098] With such arrangement, the induction heating coil can be powered by the power supply structure 12 so that the induction heating coil can work to generate heat, and the solder 200 in the feeding channel 20a can be smoothly heated by the induction heating coil.

[0099] In some embodiments, the power supply structure 12 may be a power source.

[0100] Further, see Figure 1 and Figure 2 In one embodiment of the solder adding device 100 of the present invention, the high temperature resistant protective cover 20 is a high temperature resistant insulating member.

[0101] By configuring in this way, the high temperature protection cover 20 is designed as a high temperature insulation part, so that the risk of leakage of the high temperature protection cover 20 can be reduced, thereby improving the safety of use.

[0102] In some embodiments, the high temperature resistant insulating member may be a ceramic member.

[0103] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A brazing method, characterized in that: The following steps are involved: contacting at least two workpieces to be welded to form a joint; A solder adding device is used to add liquid solder to the joint, the solder adding device comprises a feeding channel and a heating mechanism for heating the solder in the feeding channel, the heating mechanism heats the solder in the feeding channel to a liquid state, and the liquid solder is added to the joint through the outlet of the feeding channel; A welding heating device is used to perform a brazing operation on the at least two workpieces to be welded, so that a brazing seam is formed at the joint.

2. The brazing method according to claim 1, characterized in that A solder adding device is used to add liquid solder to the joint, and the welding heating device is used to perform a brazing operation on the at least two workpieces to be welded, and the amount of liquid solder added is adjusted in real time during the brazing process.

3. The brazing method according to claim 1, characterized in that: After the step of "adding liquid solder at the joint through the outlet of the feeding channel", the method further includes: The liquid solder contacts air at the joint to form a solder preform.

4. The brazing method according to claim 3, characterized in that: The step of "using a welding heating device to perform a brazing operation on the at least two workpieces to be welded" includes: The soldering heating device is used to heat the prefabricated solder so that the prefabricated solder is melted to form the soldering seam at the joint.

5. The brazing method according to any one of claims 1 to 4, characterized in that: Before the step of "using a solder adding device to add liquid solder to the joint", the method further includes: A driving mechanism is used to drive the solder adding device to move so that the discharge port of the feeding channel corresponds to the joint.

6. The brazing method according to any one of claims 1 to 4, characterized in that: The step of "adding liquid solder at the joint through the outlet of the feeding channel" comprises: The feed channel is filled with a protective gas so that the liquid solder drips from the discharge port of the feed channel to the joint under the action of gravity and the protective gas.

7. A brazing filler metal adding device used in the brazing method according to any one of claims 1 to 6, characterized in that: The solder adding device comprises: A heating device, provided with a heating mechanism and a feeding channel, wherein the discharge port of the feeding channel is arranged toward a joint between at least two workpieces to be welded; The wire feeding mechanism is provided with a wire feeding nozzle, the outlet of the wire feeding nozzle is connected with the inlet of the feeding channel, the wire feeding nozzle conveys solder to the feeding channel, the heating mechanism heats the solder in the feeding channel to melt the solder in the feeding channel into liquid solder, and the liquid solder drips from the outlet of the feeding channel to the joint.

8. The brazing filler metal adding device according to claim 7, characterized in that: The heating device also includes a high temperature resistant protective cover, which is arranged on the heating mechanism and is provided with the feeding channel.

9. The brazing filler metal adding device according to claim 8, characterized in that: The high temperature resistant protective cover is provided with a protective gas filling nozzle connected to the feeding channel.

10. The brazing filler metal adding device according to claim 9, characterized in that: The high temperature resistant protective cover comprises: A protective gas filling section, wherein a feed port of the protective gas filling section is connected to a feed port of the wire feeding nozzle, a first channel is formed in the protective gas filling section, and the protective gas filling section is provided with the protective gas filling nozzle connected to the first channel; A heating section is connected to the protective gas filling section and is arranged on the heating mechanism. A second channel connected to the first channel is formed in the heating section. The first channel and the second channel constitute the feeding channel. The heating mechanism heats the solder in the second channel. The outlet of the second channel is used to be arranged toward the joint.

11. The brazing filler metal adding device according to claim 10, characterized in that: A conveying pipe is provided in the second channel, the feed port of the conveying pipe is communicated with the discharge port of the first channel, and the discharge port of the conveying pipe is communicated with the discharge port of the second channel.

12. The brazing filler metal adding device according to claim 10, characterized in that: The high temperature resistant protective cover also includes a guide nozzle, which is arranged at the discharge end of the heating section and is used to guide the liquid solder flowing out of the discharge port of the feeding channel to the joint.

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