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Technical Support
How to weld electronic components
Visit: Date:2013-11-29
In the production of electronic components, connections to welding. The welding quality of making quality greatly. So, studying the electric to manufacture technology, must grasp the good welding welding technology, basic skills.
A, welding tools
(a) the electric iron. Electric soldering iron is the most commonly used welding tool. We use20WInternal heated electric soldering iron.The new iron before use, electricity heat, with rosin with tip edge contact solder wire, the iron plated with a layer of tin head evenly. In so doing, can facilitate welding and prevent surface oxidation of the iron head. The old iron head such as severe oxidation blackening, available steel put to the surface oxide, to expose the metal luster, re tinning, can use.Electric soldering iron to use220VThe AC power, used to Caution. Should do the following:
  1Electric soldering iron plug. The best use of the three pole plug. To make the case properly grounded.
  2. before use, should check the power plug, power line is damaged. And check whether the loosening of the soldering iron head.
  3. electric iron in use, not hard hit. To prevent falling. Soldering iron head solder is excessive, usable cloth wipe. Do not throw, in order to avoid the scald others.
  4. in the process of welding, soldering iron can not be everywhere. No welding, should be put on the iron frame. Note the power line can not be resting on the soldering iron head, to prevent burning insulation accidents.
  5After use, should be promptly cut off the power, unplug the power plug. After cooling, and then the electric iron recovery toolbox.
(two) the solder and flux
When welding, also need to solder and flux.
  1Tin solder. Soldering of electronic components, is generally used with rosin core solder wire. The solder wire, low melting point, but also contains rosin flux, is extremely easy to use.
 2.Flux. Commonly used flux is rosin or rosin (rosin dissolve in alcohol). The use of flux, can help to remove the metal oxide surface, suitable for welding, and can protect the iron head. Larger components or welding wire, also can use solder paste. But it has certain corrosion, welding should be promptly removed.
(three) auxiliary tool
In order to facilitate welding operation often using pointed nose pliers, side cutting pliers, tweezers and a knife as auxiliary tool. Students should learn the proper use of these tools.
Two, pre welding treatment
Before welding, welding position response element pins or circuit board welding pretreatment (see Figure3A11).
(a) removing oxide layer welding position.
  1By the broken saw blade made knife. Scraping the metal lead oxide layer on the surface, the pin with metallic luster.
  2Printed circuit board is available. Spinning copper polishing paper, coated with a layer of rosin alcohol solution.
(two) element tin
Tin in lead scrape on. The lead dip rosin alcohol solution, the hot iron head with tin pressure on the lead, and rotate the lead. Can be evenly plated tin lead layer is very thin. The wire should be stripped before, insulating sheath, after the above two treatment, to formal welding. If multiple strands of wire wire, lighting should be first screwed together, then tin.
Three, welding technology
After doing pre welding treatment, can be formally welding.
(a) welding method (see Figure3A12).
1 the hand holding electric iron. The left hand using pointed nose pliers or a clamping element or wires. Before welding, soldering iron to fully preheated. Tin soldering iron head to eat on the blade surface, i.e. a certain amount with solder.

2 the soldering iron head face close to the solder joint. Electric soldering iron and the level of about60°. In order to facilitate the molten tin from upper to solder iron head. Under the control of the soldering iron head stuck in the solder joints at the time2~3Second.
  3Lift the iron head. The left hand still holding the fixed component. Tin solder joints after cooling to be, can release the left hand.
  4Rotate the lead. With tweezers, confirmation is not loose, lead and then available side cutters to cut the excess.
The welding quality of welding (two)
When welding, to ensure that each solder welding firm, good contact. To ensure the welding quality. Good solder joints as shown in FigureB
(A) shows should be bright tin point, smooth without burr, moderate amount of tin. Tin and welding material firm. There should be no weld and false welding.
Weld is only a small amount of tin solder joints, causing poor contact, when the broken. False welding refers to appear to be soldered, but did not actually welding, sometimes by hand drawing, wire can be pulled out from the solder joints. These two situations will bring great difficulties to the debugging and maintenance of electronic production. Only through the practice of welding large, carefully, to avoid the two cases.<Welding circuit board, we must control the HERSHEY'S Hu too long, the circuit board is burnt, or cause the copper foil off. Remove the element from the circuit board, the electric iron head in the solder joints, the tin melting solder joints after pulling out, the element.
Skill training practice (a) welding
Objective to practice on the element of the pre welding treatment practice directly welded components.
Equipment20WInternal heated electric soldering iron, red black soft core plastic wire each2Root, a battery box,2Only the alligator clip,100European fixed resistors,470Europe, led the potentiometer1Only.
Step
Welding battery basin:
1.4The two ends of the wire, root soft plastic skin each strip about 1 cm. With a knife scrape the bright, multi strand core wire twisted together after tin.
The positive and negative poles battery box pin lug with a knife scrape bright tin plating. Two double clip wire blow a bright tin plating.
(2) welding
The red wire 1, end is welded in red the crocodile clip, while the other end is welded to the battery box cathode bonding sheet.
The black wire 1, end is welded in black the crocodile clip, the other end is welded in the negative electrode of the battery case welding sheet.
(3Check the quality of welding)
The solder joint is strong, there is no weld, false welding. Whether smooth element.
The unqualified welding spot welding.
  2Welding circuit (according to the diagram.3A4Welding).
(1) before welding processing will resistance potentiometer two pin, pin lug, light emitting diode pin with a knife scrape bright tin plating. ,
(2) welding
The resistor is welded on one side welding sheet potentiometer pins.
The welding plate welding potentiometer pins on the center of the 1 wires.
The other end of the wire welding in the light-emitting diode negative level.
The light emitting diode cathode welding on the other 1 wires.
(3Check the quality of welding)
The solder joints are bright and smooth, with no false welding and weld.
The unqualified welding joints.
Note: welding the light emitting diode, time is short, and the application of nose clamp pin root, to facilitate cooling. The battery box of the alligator clip leads are respectively clamped on both ends of the circuit welding good (note the positive and negative), to observe the light emitting diode light conditions. Rotary potentiometers, the LED brightness.
(4) welding completed, the electric iron plug, after it cools, recovery toolbox.
Skills training welding practice (two)
Objective to practice the element before welding welding circuit board processing, practice.
Equipment20Inner heating type electric iron, waste printed circuit board 1 block,1/8Watt resistor10Only.
Step
  1Before welding processing.
(1) printed circuit board copper with fine sandpaper polishing, evenly on the copper foil surface coated with a layer of rosin alcohol solution. If the printed circuit board is welded, the welding hole Zaton (available electric iron melting solder solder, serve hot with pin hole Zaton).
(2) will10Only one resistor pin with the penknife bright tin, respectively.
  2Welding.
(1) will be inserted into the printed circuit board hole resistance. From the front insert (without copper foil surface). Resistor to stay3~5Mm.
(2In the circuit board (negative) foil side), the resistor solder on copper foil, control the welding time is2~3Seconds. If you are ready to repeat the exercise, can not cut the pin. Will10Only resistance by welding on the printed circuit board.
  3Check the quality of welding.
  10A solder joints, meet the welding requirements have a son? The unqualified welding joints.
  4The resistance to remove one by one. Unplug the power plug circuit iron, packing equipment.
   5Electric iron use. A long time, there will be a black oxide and residual solder residue soldering iron head, will affect the later welding. We should clean the iron head with rosin, keep it in good working condition.In the production of electronic components, connections to welding. The welding quality of making quality greatly. So, studying the electric to manufacture technology, must grasp the good welding welding technology, basic skills.
A, welding tools
(a) the electric iron. Electric soldering iron is the most commonly used welding tool. We use20WInternal heated electric soldering iron.The new iron before use, electricity heat, with rosin with tip edge contact solder wire, the iron plated with a layer of tin head evenly. In so doing, can facilitate welding and prevent surface oxidation of the iron head. The old iron head such as severe oxidation blackening, available steel put to the surface oxide, to expose the metal luster, re tinning, can use.Electric soldering iron to use220VThe AC power, used to Caution. Should do the following:
  1Electric soldering iron plug. The best use of the three pole plug. To make the case properly grounded.
  2. before use, should check the power plug, power line is damaged. And check whether the loosening of the soldering iron head.
  3. electric iron in use, not hard hit. To prevent falling. Soldering iron head solder is excessive, usable cloth wipe. Do not throw, in order to avoid the scald others.
  4. in the process of welding, soldering iron can not be everywhere. No welding, should be put on the iron frame. Note the power line can not be resting on the soldering iron head, to prevent burning insulation accidents.
  5After use, should be promptly cut off the power, unplug the power plug. After cooling, and then the electric iron recovery toolbox.
(two) the solder and flux
When welding, also need to solder and flux.
  1Tin solder. Soldering of electronic components, is generally used with rosin core solder wire. The solder wire, low melting point, but also contains rosin flux, is extremely easy to use.
 2.Flux. Commonly used flux is rosin or rosin (rosin dissolve in alcohol). The use of flux, can help to remove the metal oxide surface, suitable for welding, and can protect the iron head. Larger components or welding wire, also can use solder paste. But it has certain corrosion, welding should be promptly removed.
(three) auxiliary tool
In order to facilitate welding operation often using pointed nose pliers, side cutting pliers, tweezers and a knife as auxiliary tool. Students should learn the proper use of these tools.
Two, pre welding treatment
Before welding, welding position response element pins or circuit board welding pretreatment (see Figure3A11).
(a) removing oxide layer welding position.
  1By the broken saw blade made knife. Scraping the metal lead oxide layer on the surface, the pin with metallic luster.
  2Printed circuit board is available. Spinning copper polishing paper, coated with a layer of rosin alcohol solution.
(two) element tin
Tin in lead scrape on. The lead dip rosin alcohol solution, the hot iron head with tin pressure on the lead, and rotate the lead. Can be evenly plated tin lead layer is very thin. The wire should be stripped before, insulating sheath, after the above two treatment, to formal welding. If multiple strands of wire wire, lighting should be first screwed together, then tin.
Three, welding technology
After doing pre welding treatment, can be formally welding.
(a) welding method (see Figure3A12).
1 the hand holding electric iron. The left hand using pointed nose pliers or a clamping element or wires. Before welding, soldering iron to fully preheated. Tin soldering iron head to eat on the blade surface, i.e. a certain amount with solder.

2 the soldering iron head face close to the solder joint. Electric soldering iron and the level of about60°. In order to facilitate the molten tin from upper to solder iron head. Under the control of the soldering iron head stuck in the solder joints at the time2~3Second.
  3Lift the iron head. The left hand still holding the fixed component. Tin solder joints after cooling to be, can release the left hand.
  4Rotate the lead. With tweezers, confirmation is not loose, lead and then available side cutters to cut the excess.
The welding quality of welding (two)
When welding, to ensure that each solder welding firm, good contact. To ensure the welding quality. Good solder joints as shown in FigureB
(A) shows should be bright tin point, smooth without burr, moderate amount of tin. Tin and welding material firm. There should be no weld and false welding.
Weld is only a small amount of tin solder joints, causing poor contact, when the broken. False welding refers to appear to be soldered, but did not actually welding, sometimes by hand drawing, wire can be pulled out from the solder joints. These two situations will bring great difficulties to the debugging and maintenance of electronic production. Only through the practice of welding large, carefully, to avoid the two cases.<Welding circuit board, we must control the HERSHEY'S Hu too long, the circuit board is burnt, or cause the copper foil off. Remove the element from the circuit board, the electric iron head in the solder joints, the tin melting solder joints after pulling out, the element.
Skill training practice (a) welding
Objective to practice on the element of the pre welding treatment practice directly welded components.
Equipment20WInternal heated electric soldering iron, red black soft core plastic wire each2Root, a battery box,2Only the alligator clip,100European fixed resistors,470Europe, led the potentiometer1Only.
Step
Welding battery basin:
1.4The two ends of the wire, root soft plastic skin each strip about 1 cm. With a knife scrape the bright, multi strand core wire twisted together after tin.
The positive and negative poles battery box pin lug with a knife scrape bright tin plating. Two double clip wire blow a bright tin plating.
(2) welding
The red wire 1, end is welded in red the crocodile clip, while the other end is welded to the battery box cathode bonding sheet.
The black wire 1, end is welded in black the crocodile clip, the other end is welded in the negative electrode of the battery case welding sheet.
(3Check the quality of welding)
The solder joint is strong, there is no weld, false welding. Whether smooth element.
The unqualified welding spot welding.
  2Welding circuit (according to the diagram.3A4Welding).
(1) before welding processing will resistance potentiometer two pin, pin lug, light emitting diode pin with a knife scrape bright tin plating. ,
(2) welding
The resistor is welded on one side welding sheet potentiometer pins.
The welding plate welding potentiometer pins on the center of the 1 wires.
The other end of the wire welding in the light-emitting diode negative level.
The light emitting diode cathode welding on the other 1 wires.
(3Check the quality of welding)
The solder joints are bright and smooth, with no false welding and weld.
The unqualified welding joints.
Note: welding the light emitting diode, time is short, and the application of nose clamp pin root, to facilitate cooling. The battery box of the alligator clip leads are respectively clamped on both ends of the circuit welding good (note the positive and negative), to observe the light emitting diode light conditions. Rotary potentiometers, the LED brightness.
(4) welding completed, the electric iron plug, after it cools, recovery toolbox.
Skills training welding practice (two)
Objective to practice the element before welding welding circuit board processing, practice.
Equipment20Inner heating type electric iron, waste printed circuit board 1 block,1/8Watt resistor10Only.
Step
  1Before welding processing.
(1) printed circuit board copper with fine sandpaper polishing, evenly on the copper foil surface coated with a layer of rosin alcohol solution. If the printed circuit board is welded, the welding hole Zaton (available electric iron melting solder solder, serve hot with pin hole Zaton).
(2) will10Only one resistor pin with the penknife bright tin, respectively.
  2Welding.
(1) will be inserted into the printed circuit board hole resistance. From the front insert (without copper foil surface). Resistor to stay3~5Mm.
(2In the circuit board (negative) foil side), the resistor solder on copper foil, control the welding time is2~3Seconds. If you are ready to repeat the exercise, can not cut the pin. Will10Only resistance by welding on the printed circuit board.
  3Check the quality of welding.
  10A solder joints, meet the welding requirements have a son? The unqualified welding joints.
  4The resistance to remove one by one. Unplug the power plug circuit iron, packing equipment.
   5Electric iron use. A long time, there will be a black oxide and residual solder residue soldering iron head, will affect the later welding. We should clean the iron head with rosin, keep it in good working condition.
Common problems during welding Common problems and treatment methods of tin:


1
Flux and bottom surface of bad contact; bottom plate and the solder point of improper.

2
The flux ratio is too high or too low.

3
Conveyor speed is too slow or too fast speed, standard for1.2-1.8M/MIN, too fast, the solder joint is fine and glossy tip;

Too slow when the solder joints slightly round and a stocky shape.

4
Oxidation of oil too much or deterioration in tin stove plates.

5
The preheating temperature is too high or too low; soldering temperature before, standard for75-100Degree. (adjust according to the actual situation)

6
The preheating temperature is too high or too low; standard temperature245-255Degree, too low solder joint is fine and glossy tip;

Too high a slightly round and stubby shaped solder joints.

7
Tin wave instability.

8
Tin solder impurity.

9
Component pin direction and poor alignment.

10
The original floor, lead misconduct.

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