Encoder welding is a technical, careful to do, how to avoid the encoder virtual welding?
The most direct the most fundamental method, still have to do a good job cleaning before welding, when clearing note: do not use solder paste, because it contains acid material, probably will corrosion encoder pin, virtual welding.
False welding is also known as virtual welding, look have solder joints, actually there is no welding, encoder on the leg of the solder joints, when when broken, so can also cause the point of failure, in order to avoid and prevent the encoder virtual welding phenomenon, need to pay attention to the following, first keep the welding steel-toed clean, because the electric soldering iron head is in a state of high temperature for a long time, its surface oxidizing or burned to death, it is easy to let the welding head thermal conductivity variation and influence the welding quality, so when welding steel-toed temperature is too high, can temporarily remove the plug or a dip in rosin on cooling.
Tin on the second note, if the weldment and the solder joint surface with rust stains, dirt and oxides, to shave before welding, until light metal, can be to weld or solder tin plating on the surface.
In order to make the temperature is just right, according to the size of the encoder to choose suitable electric power, when the electric power of the choice must, to control the length of the heating time, so as not to appear accident of welding and welding failure.
Finally the encoder, welding time, welding time appropriate exercise is also an important part of the welding technology.
Encoder welding should pay attention to the following matters 1, if the weldment and solder joint surface with rust stains, dirt or oxide, should be cleaned before welding, to weld or solder tin plating on the surface.
2, when a weld complete welding, welding head selection of evacuation point is particularly important.
When welding head along the inclined top to evacuate, soldering iron head to take a small amount of beads, it can form a smooth solder joints;
When the welding head vertical evacuation, can form icicles burr solder joints;
When the welding head in horizontal direction to evacuate, welding head can take most of the beads.
3, often wipe, and then keep the soldering iron head clean.
Because the electric soldering iron head is in a state of high temperature for a long time, its surface oxidation or burn easily, make the welding head thermal conductivity variation and affect the welding quality.
Therefore, can use wet cloth or wet sponge iron impurities, when temperature is too high, can temporarily remove the plug or dip in rosin cool, make the soldering iron head hung tin good at any time.
4, in the process of weld solidification, remember do not touch the weld by hand.
Welding point before not completely frozen, even if there is a small vibration also can make deformation of solder joints, causing virtual welding.
Therefore, welding parts to be fixed before welding head to evacuate, if use tweezers clamping, or welding head out after a quick blow with the mouth, to the purpose of these practices, is to shorten the time of solder solidification.
5, on the quantity of tin wants moderate.
Can according to the size of the solder joint required to determine the dip soldering iron tin, the solder coated by weld toughness, enough to form a suitable size and sleek solder joints.
Solder joints are not tin, tin is more good, on the contrary, the possibility of the solder joints virtual welding, is likely to be solder accumulation in the above, instead of weld on it.
If a tin content is insufficient, can repair welding again, but must stay on the previous tin to melt together and then remove the soldering iron;
If a tin content is too much, can be used welding head take right amount.
6, to control the welding time, can not be too long.
The proper use of welding time also is an important part of the welding craft.
If it is a printed circuit board welding, usually with 2 ~ 3 s advisable.
Welding time is too long, solder flux of volatile, completely lost to help welding effect, make the solder surface oxidation, resulting in a rough surface, solder joint black, no light, defects such as burrs or flow.
At the same time, welding time is too long, the temperature is too high, it is easier for hot components or printed circuit board copper foil.
If the welding time is too short, and short of welding temperature, soldering is not fully melted, affect the solder wetting, easy create virtual welding.
7, the welding temperature should be appropriate, there will not be too high, too low.
In order to make the temperature is just right, should according to the size of the encoder to choose suitable electric power, electric power must be elected by, attention should be paid to control the length of the heating time.
When soldering iron head automatic scattered to the welding material, heating time is enough.
Quickly remove the welding head at this time, was left a sleek solder welding place.
If removed after soldering iron and be a little tin leave or left few welding place, the heating time is too short, the temperature is not enough or being too dirty welding;
If removed prior to soldering iron, soldering is flowing downwards, suggests that the heating time is too long, the temperature is too high.
General welding head temperature control in the flux melting faster when you don't smoke again as the best welding temperature.
We also it is important to note that the ordinary adjustable encoder is typically have three pins or terminal pin, welding and other ordinary PCB perforation device of welding, lead foot is the same, the welding line up.
Pay attention to the welding temperature and welding time, understand common welding technique can be successfully completed.
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