CN111906400A - LED circuit structural member and welding process thereof - Google Patents
LED circuit structural member and welding process thereof Download PDFInfo
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- CN111906400A CN111906400A CN202010735937.9A CN202010735937A CN111906400A CN 111906400 A CN111906400 A CN 111906400A CN 202010735937 A CN202010735937 A CN 202010735937A CN 111906400 A CN111906400 A CN 111906400A
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- welding
- tin
- soldering
- led lamp
- soldering iron
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
Abstract
The invention relates to the technical field of welding processes, and discloses a circuit structural member of an LED and a welding process thereof, wherein the welding process comprises the following steps: 1) a welder must wear an anti-static glove, an anti-static wrist and an anti-static work clothes, an electric soldering iron must be grounded, the workbench is an anti-static workbench, the LED lamp to be welded and the PCB are flatly placed on the workbench, and the two lead pins of the LED lamp are strictly prohibited from being touched by hands; 2) and inserting the LED lamp into the wire hole in the PCB according to the design of the original circuit diagram, and then welding one by one from left to right or from top to bottom. This LED's circuit structure spare and welding process preheats through the accurate pin to the bonding pad of PCB board and LED lamp, avoids causing the LED lamp to damage or the not up to standard condition of welding point to take place among the welding process, and through visual inspection and repair processing at last, the condition of avoiding welding not up to standard or not up to standard product outflow takes place, reaches simple and convenient high-efficient accurate welded effect.
Description
Technical Field
The invention relates to the technical field of welding processes, in particular to a circuit structural member of an LED and a welding process thereof.
Background
Along with the acceleration of the package updating of electronic components, the original direct insertion type is changed into the flat-pasting type, the connecting flat cable is replaced by an FPC (flexible printed circuit) soft board, the electronic development is towards miniaturization and microminiaturization, the manual welding difficulty is increased, components can be damaged or poor welding can be caused by carelessness in the welding process, so a manual welding worker has to realize certain understanding on the welding principle, the welding process, the welding method, the welding quality and the electronic basis, the soldering is a science, the soldering is a principle that a solid soldering tin wire is heated and melted by a heated soldering iron and flows into the metals to be welded by the aid of the action of a scaling powder, a firm and reliable welding point is formed after cooling, when the welding surface of the tin-lead alloy is copper, the welding flux is firstly wetted to the welding surface, and is gradually diffused to the metal copper along with the occurrence of the wetting phenomenon, an adhesion layer is formed on the contact surface between the solder and the metal copper, so that the solder and the metal copper are firmly combined.
The traditional circuit structural member of the LED is welded without accurately preheating a welding disc and pins, so that the welding points are easy to fail to reach the standard or the electronic components are damaged due to overhigh temperature or have short service life, and the like, and the circuit structural member of the LED and the welding process thereof are provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the LED circuit structural member and the welding process thereof, which have the advantages of high-efficiency welding and the like, and solve the problem that the welding point is not up to the standard or the electronic component is damaged due to overhigh temperature or short service life and the like because the welding of the traditional LED circuit structural member is not accurate to preheat the welding disc and the pin.
(II) technical scheme
In order to achieve the purpose of efficient welding, the invention provides the following technical scheme: a circuit structural member of an LED and a welding process thereof comprise the following steps:
1) a welder must wear an anti-static glove, an anti-static wrist and an anti-static work clothes, an electric soldering iron must be grounded, the workbench is an anti-static workbench, the LED lamp to be welded and the PCB are flatly placed on the workbench, and the two lead pins of the LED lamp are strictly prohibited from being touched by hands;
2) inserting the LED lamp into a wire hole in a PCB (printed circuit board) according to the design of an original circuit diagram, and then welding the LED lamp one by one from left to right or from top to bottom, wherein the distance between the colloid of the LED lamp and the PCB is kept to be more than 2mm, the welding temperature of an electric soldering iron is 260-300 ℃, the welding time is 1-4 seconds, the angle between a soldering iron head of the electric soldering iron and the PCB is 30-45 degrees in the welding process, and the soldering iron head of the electric soldering iron props against a welding disc of the PCB and a pin of the LED lamp and uniformly heats the soldering iron head and the PCB during welding;
3) moving the soldering wire in, leading the soldering wire from the contact surface of the pin of the LED lamp and the electric soldering iron, and enabling the soldering wire to lean between the pin of the LED lamp and the soldering bit of the electric soldering iron;
4) removing the soldering tin, and taking the soldering tin wire away in the direction of 45 degrees when the soldering tin wire is molten and the soldering tin is scattered on the whole bonding pad;
5) the electric soldering iron is moved away, after the soldering tin wire is taken away, the soldering iron is continuously placed on the bonding pad for 1-2 seconds, when only slight smoke of the soldering tin is emitted, the soldering iron can be taken away, when the soldering iron is taken away, the soldering iron is not required to be quickly or forcibly lifted upwards, so that tin beads and tin points are prevented from being splashed, or the soldering tin points are prevented from being pointed, meanwhile, the soldered components are ensured not to move or be vibrated before the soldering tin is solidified, otherwise, the phenomena of loose structure, insufficient soldering and the like of the soldering points are easily caused;
6) after welding, carrying out appearance inspection on the welded blank, checking whether welding missing parts, butt welding parts and deficiency-type welding parts exist, and cleaning welding flux at the welding points;
7) and (4) carrying out repair treatment on the product which does not reach the standard in the appearance inspection in the step 6), wherein the repair frequency is not more than two times.
Preferably, the solder wire feeding time, feeding position and feeding measurement are strictly controlled, and the feeding time: in principle, the soldering tin wire is immediately fed when the temperature of the welded part is raised to reach the melting temperature of the solder; supply position: should be between the soldering iron and the piece to be soldered and as close to the pad as possible; supply measurement: the size of the welded part and the bonding pad is considered, and the molten soldering tin is higher than one third of the diameter of the bonding pad after covering the bonding pad.
Preferably, the standard soldering tin point of the appearance inspection is judged, namely, the soldering tin point is in an inner arc shape; secondly, the tin points are rounded and smooth, have no pinholes and have no rosin stains; thirdly, the wire legs are required to be arranged, and the length of the wire legs is 1-1.2 mm; the pin shape of the LED lamp has good flowing property of the visible tin; the tin surrounds the whole tin-coating position and the part pins.
Preferably, the nonstandard tin point judgment of the appearance inspection comprises the following steps of: it seems that no welding is actually carried out, and the welding pad and the pin are mainly polluted or the soldering flux and the heating time are not enough; secondly, short circuit, the short circuit is caused by the connection of redundant soldering tin between the welding disk of the PCB and the welding disk, and the short circuit is caused by the contact between the pins due to improper operation of inspectors by using tweezers or hands and the like, and the short circuit is caused by residual tin slag; ③ deviation: the pin is not in the specified pad area due to inaccurate positioning of the device before welding or error caused during welding; fourthly, less tin: the tin is less, namely the tin point is too thin, the copper sheet of the part cannot be fully covered, and the connection and fixation effects are influenced; tin is excessive: the part pins are completely covered by tin and form an outer arc shape, so that the appearance and the bonding pad position of the part cannot be seen, and whether the part and the bonding pad are well tinned or not cannot be determined; sixthly, wrong parts: the specification or the type of the part placement is not in accordance with the operation specification or BOM and ECN, namely the wrong part is obtained; seventh, missing parts: the position where the part should be placed is vacant due to abnormal reasons; the solder balls and the tin slag: redundant solder balls and solder dross are attached to the surface of the PCB, so that the short circuit of the tiny pins can be caused; ninthly, polarity is reversed: the correctness of the polarity direction is inconsistent with the processing requirement, namely the polarity is wrong.
(III) advantageous effects
Compared with the prior art, the invention provides an LED circuit structural member and a welding process thereof, and the LED circuit structural member has the following beneficial effects:
this LED's circuit structure spare and welding process, dress through the welder and prevent static gloves and prevent static wrist and prevent static work clothes, electric iron ground connection and workstation are for preventing series antistatic measures such as static workstation, avoid human or the static in the welding process to cause the condition emergence of LED diode's crystalline layer damage or reduction LED lamp life, the rethread is accurate preheats the welding dish of PCB board and the pin of LED lamp, avoid causing the condition emergence that LED lamp damaged or welding point not up to standard among the welding process, at last through outward appearance inspection and repair processing, avoid welding not up to standard or not up to standard product outflow's condition emergence, reach simple and convenient high-efficient accurate welded effect, thereby the welding quality of this welding process has been improved, make this welding process facilitate promotion.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a circuit structural member of an LED and a welding process thereof comprise the following steps:
1) a welder must wear an anti-static glove, an anti-static wrist and an anti-static work clothes, an electric soldering iron must be grounded, the workbench is an anti-static workbench, the LED lamp to be welded and the PCB are flatly placed on the workbench, and the two lead pins of the LED lamp are strictly prohibited from being touched by hands;
2) inserting the LED lamp into a wire hole in a PCB (printed circuit board) according to the design of an original circuit diagram, and then welding the LED lamp one by one from left to right or from top to bottom, wherein the distance between the colloid of the LED lamp and the PCB is kept to be more than 2mm, the welding temperature of an electric soldering iron is 260-300 ℃, the welding time is 1-4 seconds, the angle between a soldering iron head of the electric soldering iron and the PCB is 30 degrees in the welding process, and the soldering iron head of the electric soldering iron props against a welding disc of the PCB and a pin of the LED lamp and uniformly heats the soldering iron head and the PCB during welding;
3) moving the soldering wire in, leading the soldering wire from the contact surface of the pin of the LED lamp and the electric soldering iron, and enabling the soldering wire to lean between the pin of the LED lamp and the soldering bit of the electric soldering iron;
4) removing the soldering tin, and taking the soldering tin wire away in the direction of 45 degrees when the soldering tin wire is molten and the soldering tin is scattered on the whole bonding pad;
5) the electric soldering iron is moved away, after the soldering tin wire is taken away, the soldering iron is continuously placed on the bonding pad for 1-2 seconds, when only slight smoke of the soldering tin is emitted, the soldering iron can be taken away, when the soldering iron is taken away, the soldering iron is not required to be quickly or forcibly lifted upwards, so that tin beads and tin points are prevented from being splashed, or the soldering tin points are prevented from being pointed, meanwhile, the soldered components are ensured not to move or be vibrated before the soldering tin is solidified, otherwise, the phenomena of loose structure, insufficient soldering and the like of the soldering points are easily caused;
6) after welding, carrying out appearance inspection on the welded blank, checking whether welding missing parts, butt welding parts and deficiency-type welding parts exist, and cleaning welding flux at the welding points;
7) and (4) carrying out repair treatment on the product which does not reach the standard in the appearance inspection in the step 6), wherein the repair frequency is not more than two times.
The solder wire feeding time, feeding position and feeding measurement should be strictly controlled, and the feeding time: in principle, the soldering tin wire is immediately fed when the temperature of the welded part is raised to reach the melting temperature of the solder; supply position: should be between the soldering iron and the piece to be soldered and as close to the pad as possible; supply measurement: the size of the welded part and the bonding pad is considered, and the molten soldering tin is higher than one third of the diameter of the bonding pad after covering the bonding pad.
Judging standard soldering tin points of the appearance inspection, wherein the soldering tin points form an inner arc shape; secondly, the tin points are rounded and smooth, have no pinholes and have no rosin stains; thirdly, the wire legs are required to be arranged, and the length of the wire legs is 1-1.2 mm; the pin shape of the LED lamp has good flowing property of the visible tin; the tin surrounds the whole tin-coating position and the part pins.
Judging nonstandard tin points of the appearance inspection, namely performing deficiency-type welding: it seems that no welding is actually carried out, and the welding pad and the pin are mainly polluted or the soldering flux and the heating time are not enough; secondly, short circuit, the short circuit is caused by the connection of redundant soldering tin between the welding disk of the PCB and the welding disk, and the short circuit is caused by the contact between the pins due to improper operation of inspectors by using tweezers or hands and the like, and the short circuit is caused by residual tin slag; ③ deviation: the pin is not in the specified pad area due to inaccurate positioning of the device before welding or error caused during welding; fourthly, less tin: the tin is less, namely the tin point is too thin, the copper sheet of the part cannot be fully covered, and the connection and fixation effects are influenced; tin is excessive: the part pins are completely covered by tin and form an outer arc shape, so that the appearance and the bonding pad position of the part cannot be seen, and whether the part and the bonding pad are well tinned or not cannot be determined; sixthly, wrong parts: the specification or the type of the part placement is not in accordance with the operation specification or BOM and ECN, namely the wrong part is obtained; seventh, missing parts: the position where the part should be placed is vacant due to abnormal reasons; the solder balls and the tin slag: redundant solder balls and solder dross are attached to the surface of the PCB, so that the short circuit of the tiny pins can be caused; ninthly, polarity is reversed: the correctness of the polarity direction is inconsistent with the processing requirement, namely the polarity is wrong.
Example two: a circuit structural member of an LED and a welding process thereof comprise the following steps:
1) a welder must wear an anti-static glove, an anti-static wrist and an anti-static work clothes, an electric soldering iron must be grounded, the workbench is an anti-static workbench, the LED lamp to be welded and the PCB are flatly placed on the workbench, and the two lead pins of the LED lamp are strictly prohibited from being touched by hands;
2) inserting the LED lamp into a wire hole in a PCB (printed circuit board) according to the design of an original circuit diagram, and then welding the LED lamp one by one from left to right or from top to bottom, wherein the distance between the colloid of the LED lamp and the PCB is kept to be more than 2mm, the welding temperature of an electric soldering iron is 260-300 ℃, the welding time is 1-4 seconds, the angle between a soldering iron head of the electric soldering iron and the PCB is 40 degrees in the welding process, and the soldering iron head of the electric soldering iron props against a welding disc of the PCB and a pin of the LED lamp and uniformly heats the soldering iron head and the PCB during welding;
3) moving the soldering wire in, leading the soldering wire from the contact surface of the pin of the LED lamp and the electric soldering iron, and enabling the soldering wire to lean between the pin of the LED lamp and the soldering bit of the electric soldering iron;
4) removing the soldering tin, and taking the soldering tin wire away in the direction of 45 degrees when the soldering tin wire is molten and the soldering tin is scattered on the whole bonding pad;
5) the electric soldering iron is moved away, after the soldering tin wire is taken away, the soldering iron is continuously placed on the bonding pad for 1-2 seconds, when only slight smoke of the soldering tin is emitted, the soldering iron can be taken away, when the soldering iron is taken away, the soldering iron is not required to be quickly or forcibly lifted upwards, so that tin beads and tin points are prevented from being splashed, or the soldering tin points are prevented from being pointed, meanwhile, the soldered components are ensured not to move or be vibrated before the soldering tin is solidified, otherwise, the phenomena of loose structure, insufficient soldering and the like of the soldering points are easily caused;
6) after welding, carrying out appearance inspection on the welded blank, checking whether welding missing parts, butt welding parts and deficiency-type welding parts exist, and cleaning welding flux at the welding points;
7) and (4) carrying out repair treatment on the product which does not reach the standard in the appearance inspection in the step 6), wherein the repair frequency is not more than two times.
The solder wire feeding time, feeding position and feeding measurement should be strictly controlled, and the feeding time: in principle, the soldering tin wire is immediately fed when the temperature of the welded part is raised to reach the melting temperature of the solder; supply position: should be between the soldering iron and the piece to be soldered and as close to the pad as possible; supply measurement: the size of the welded part and the bonding pad is considered, and the molten soldering tin is higher than one third of the diameter of the bonding pad after covering the bonding pad.
Judging standard soldering tin points of the appearance inspection, wherein the soldering tin points form an inner arc shape; secondly, the tin points are rounded and smooth, have no pinholes and have no rosin stains; thirdly, the wire legs are required to be arranged, and the length of the wire legs is 1-1.2 mm; the pin shape of the LED lamp has good flowing property of the visible tin; the tin surrounds the whole tin-coating position and the part pins.
Judging nonstandard tin points of the appearance inspection, namely performing deficiency-type welding: it seems that no welding is actually carried out, and the welding pad and the pin are mainly polluted or the soldering flux and the heating time are not enough; secondly, short circuit, the short circuit is caused by the connection of redundant soldering tin between the welding disk of the PCB and the welding disk, and the short circuit is caused by the contact between the pins due to improper operation of inspectors by using tweezers or hands and the like, and the short circuit is caused by residual tin slag; ③ deviation: the pin is not in the specified pad area due to inaccurate positioning of the device before welding or error caused during welding; fourthly, less tin: the tin is less, namely the tin point is too thin, the copper sheet of the part cannot be fully covered, and the connection and fixation effects are influenced; tin is excessive: the part pins are completely covered by tin and form an outer arc shape, so that the appearance and the bonding pad position of the part cannot be seen, and whether the part and the bonding pad are well tinned or not cannot be determined; sixthly, wrong parts: the specification or the type of the part placement is not in accordance with the operation specification or BOM and ECN, namely the wrong part is obtained; seventh, missing parts: the position where the part should be placed is vacant due to abnormal reasons; the solder balls and the tin slag: redundant solder balls and solder dross are attached to the surface of the PCB, so that the short circuit of the tiny pins can be caused; ninthly, polarity is reversed: the correctness of the polarity direction is inconsistent with the processing requirement, namely the polarity is wrong.
Example three: a circuit structural member of an LED and a welding process thereof comprise the following steps:
1) a welder must wear an anti-static glove, an anti-static wrist and an anti-static work clothes, an electric soldering iron must be grounded, the workbench is an anti-static workbench, the LED lamp to be welded and the PCB are flatly placed on the workbench, and the two lead pins of the LED lamp are strictly prohibited from being touched by hands;
2) inserting the LED lamp into a wire hole in a PCB (printed circuit board) according to the design of an original circuit diagram, and then welding the LED lamp one by one from left to right or from top to bottom, wherein the distance between the colloid of the LED lamp and the PCB is kept to be more than 2mm, the welding temperature of an electric soldering iron is 260-300 ℃, the welding time is 1-4 seconds, the angle between a soldering iron head of the electric soldering iron and the PCB is 45 degrees in the welding process, and the soldering iron head of the electric soldering iron props against a welding disc of the PCB and a pin of the LED lamp and uniformly heats the soldering iron head and the PCB during welding;
3) moving the soldering wire in, leading the soldering wire from the contact surface of the pin of the LED lamp and the electric soldering iron, and enabling the soldering wire to lean between the pin of the LED lamp and the soldering bit of the electric soldering iron;
4) removing the soldering tin, and taking the soldering tin wire away in the direction of 45 degrees when the soldering tin wire is molten and the soldering tin is scattered on the whole bonding pad;
5) the electric soldering iron is moved away, after the soldering tin wire is taken away, the soldering iron is continuously placed on the bonding pad for 1-2 seconds, when only slight smoke of the soldering tin is emitted, the soldering iron can be taken away, when the soldering iron is taken away, the soldering iron is not required to be quickly or forcibly lifted upwards, so that tin beads and tin points are prevented from being splashed, or the soldering tin points are prevented from being pointed, meanwhile, the soldered components are ensured not to move or be vibrated before the soldering tin is solidified, otherwise, the phenomena of loose structure, insufficient soldering and the like of the soldering points are easily caused;
6) after welding, carrying out appearance inspection on the welded blank, checking whether welding missing parts, butt welding parts and deficiency-type welding parts exist, and cleaning welding flux at the welding points;
7) and (4) carrying out repair treatment on the product which does not reach the standard in the appearance inspection in the step 6), wherein the repair frequency is not more than two times.
The solder wire feeding time, feeding position and feeding measurement should be strictly controlled, and the feeding time: in principle, the soldering tin wire is immediately fed when the temperature of the welded part is raised to reach the melting temperature of the solder; supply position: should be between the soldering iron and the piece to be soldered and as close to the pad as possible; supply measurement: the size of the welded part and the bonding pad is considered, and the molten soldering tin is higher than one third of the diameter of the bonding pad after covering the bonding pad.
Judging standard soldering tin points of the appearance inspection, wherein the soldering tin points form an inner arc shape; secondly, the tin points are rounded and smooth, have no pinholes and have no rosin stains; thirdly, the wire legs are required to be arranged, and the length of the wire legs is 1-1.2 mm; the pin shape of the LED lamp has good flowing property of the visible tin; the tin surrounds the whole tin-coating position and the part pins.
Judging nonstandard tin points of the appearance inspection, namely performing deficiency-type welding: it seems that no welding is actually carried out, and the welding pad and the pin are mainly polluted or the soldering flux and the heating time are not enough; secondly, short circuit, the short circuit is caused by the connection of redundant soldering tin between the welding disk of the PCB and the welding disk, and the short circuit is caused by the contact between the pins due to improper operation of inspectors by using tweezers or hands and the like, and the short circuit is caused by residual tin slag; ③ deviation: the pin is not in the specified pad area due to inaccurate positioning of the device before welding or error caused during welding; fourthly, less tin: the tin is less, namely the tin point is too thin, the copper sheet of the part cannot be fully covered, and the connection and fixation effects are influenced; tin is excessive: the part pins are completely covered by tin and form an outer arc shape, so that the appearance and the bonding pad position of the part cannot be seen, and whether the part and the bonding pad are well tinned or not cannot be determined; sixthly, wrong parts: the specification or the type of the part placement is not in accordance with the operation specification or BOM and ECN, namely the wrong part is obtained; seventh, missing parts: the position where the part should be placed is vacant due to abnormal reasons; the solder balls and the tin slag: redundant solder balls and solder dross are attached to the surface of the PCB, so that the short circuit of the tiny pins can be caused; ninthly, polarity is reversed: the correctness of the polarity direction is inconsistent with the processing requirement, namely the polarity is wrong.
The invention has the beneficial effects that: wear through the welder and prevent static gloves and prevent static wrist and prevent static work clothes, electric iron ground connection and workstation are for preventing series antistatic measure such as static workstation, avoid human or the static in the welding process to cause the condition that the crystalline layer of LED diode damaged or reduced LED lamp life to take place, the rethread is accurate preheats the welding dish of PCB board and the pin of LED lamp, it damages or the condition emergence that the welding point is not up to standard to cause the LED lamp in the welding process, at last through visual inspection and reprocess the processing, avoid welding the condition emergence of not up to standard or not up to standard product outflow, reach simple convenient high-efficient accurate welded effect, thereby the welding quality of this welding process has been improved, make this welding process facilitate promotion.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A circuit structural member of an LED and a welding process thereof are characterized by comprising the following steps:
1) a welder must wear an anti-static glove, an anti-static wrist and an anti-static work clothes, an electric soldering iron must be grounded, the workbench is an anti-static workbench, the LED lamp to be welded and the PCB are flatly placed on the workbench, and the two lead pins of the LED lamp are strictly prohibited from being touched by hands;
2) inserting the LED lamp into a wire hole in a PCB (printed circuit board) according to the design of an original circuit diagram, and then welding the LED lamp one by one from left to right or from top to bottom, wherein the distance between the colloid of the LED lamp and the PCB is kept to be more than 2mm, the welding temperature of an electric soldering iron is 260-300 ℃, the welding time is 1-4 seconds, the angle between a soldering iron head of the electric soldering iron and the PCB is 30-45 degrees in the welding process, and the soldering iron head of the electric soldering iron props against a welding disc of the PCB and a pin of the LED lamp and uniformly heats the soldering iron head and the PCB during welding;
3) moving the soldering wire in, leading the soldering wire from the contact surface of the pin of the LED lamp and the electric soldering iron, and enabling the soldering wire to lean between the pin of the LED lamp and the soldering bit of the electric soldering iron;
4) removing the soldering tin, and taking the soldering tin wire away in the direction of 45 degrees when the soldering tin wire is molten and the soldering tin is scattered on the whole bonding pad;
5) the electric soldering iron is moved away, after the soldering tin wire is taken away, the soldering iron is continuously placed on the bonding pad for 1-2 seconds, when only slight smoke of the soldering tin is emitted, the soldering iron can be taken away, when the soldering iron is taken away, the soldering iron is not required to be quickly or forcibly lifted upwards, so that tin beads and tin points are prevented from being splashed, or the soldering tin points are prevented from being pointed, meanwhile, the soldered components are ensured not to move or be vibrated before the soldering tin is solidified, otherwise, the phenomena of loose structure, insufficient soldering and the like of the soldering points are easily caused;
6) after welding, carrying out appearance inspection on the welded blank, checking whether welding missing parts, butt welding parts and deficiency-type welding parts exist, and cleaning welding flux at the welding points;
7) and (4) carrying out repair treatment on the product which does not reach the standard in the appearance inspection in the step 6), wherein the repair frequency is not more than two times.
2. The circuit structural member for LED and the soldering process thereof according to claim 1, wherein the feeding time, feeding position and feeding measure of the solder wire are strictly controlled, wherein the feeding time is: in principle, the soldering tin wire is immediately fed when the temperature of the welded part is raised to reach the melting temperature of the solder; supply position: should be between the soldering iron and the piece to be soldered and as close to the pad as possible; supply measurement: the size of the welded part and the bonding pad is considered, and the molten soldering tin is higher than one third of the diameter of the bonding pad after covering the bonding pad.
3. The LED circuit structural member and the welding process thereof as claimed in claim 1, wherein standard solder points of the appearance inspection are determined, i.e. the solder points are in an inner arc shape; secondly, the tin points are rounded and smooth, have no pinholes and have no rosin stains; thirdly, the wire legs are required to be arranged, and the length of the wire legs is 1-1.2 mm; the pin shape of the LED lamp has good flowing property of the visible tin; the tin surrounds the whole tin-coating position and the part pins.
4. The LED circuit structure and the LED circuit structure welding process according to claim 1, wherein the non-standard tin point determination of the visual inspection is a deficiency-type welding: it seems that no welding is actually carried out, and the welding pad and the pin are mainly polluted or the soldering flux and the heating time are not enough; secondly, short circuit, the short circuit is caused by the connection of redundant soldering tin between the welding disk of the PCB and the welding disk, and the short circuit is caused by the contact between the pins due to improper operation of inspectors by using tweezers or hands and the like, and the short circuit is caused by residual tin slag; ③ deviation: the pin is not in the specified pad area due to inaccurate positioning of the device before welding or error caused during welding; fourthly, less tin: the tin is less, namely the tin point is too thin, the copper sheet of the part cannot be fully covered, and the connection and fixation effects are influenced; tin is excessive: the part pins are completely covered by tin and form an outer arc shape, so that the appearance and the bonding pad position of the part cannot be seen, and whether the part and the bonding pad are well tinned or not cannot be determined; sixthly, wrong parts: the specification or the type of the part placement is not in accordance with the operation specification or BOM and ECN, namely the wrong part is obtained; seventh, missing parts: the position where the part should be placed is vacant due to abnormal reasons; the solder balls and the tin slag: redundant solder balls and solder dross are attached to the surface of the PCB, so that the short circuit of the tiny pins can be caused; ninthly, polarity is reversed: the correctness of the polarity direction is inconsistent with the processing requirement, namely the polarity is wrong.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735937.9A CN111906400A (en) | 2020-07-28 | 2020-07-28 | LED circuit structural member and welding process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735937.9A CN111906400A (en) | 2020-07-28 | 2020-07-28 | LED circuit structural member and welding process thereof |
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| CN111906400A true CN111906400A (en) | 2020-11-10 |
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| CN202010735937.9A Withdrawn CN111906400A (en) | 2020-07-28 | 2020-07-28 | LED circuit structural member and welding process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743175A (en) * | 2020-12-28 | 2021-05-04 | 北京滨松光子技术股份有限公司 | Method for welding vibration-resistant and high-temperature-resistant photomultiplier packaging voltage division circuit of petroleum logging |
| CN115156656A (en) * | 2022-09-08 | 2022-10-11 | 新沂锐辰太阳能有限公司 | Solar LED lamp pin welding device |
-
2020
- 2020-07-28 CN CN202010735937.9A patent/CN111906400A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112743175A (en) * | 2020-12-28 | 2021-05-04 | 北京滨松光子技术股份有限公司 | Method for welding vibration-resistant and high-temperature-resistant photomultiplier packaging voltage division circuit of petroleum logging |
| CN115156656A (en) * | 2022-09-08 | 2022-10-11 | 新沂锐辰太阳能有限公司 | Solar LED lamp pin welding device |
| CN115156656B (en) * | 2022-09-08 | 2022-11-25 | 新沂锐辰太阳能有限公司 | Solar LED lamp pin welding device |
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Application publication date: 20201110 |