Hiç kimse PCB üzerinde soğuk lehim bağlantıları istemez, ancak dikkatli veya becerikli değilseniz PCB montaj sürecinde meydana gelir. Bu metinde, we will let you know deeply about solder cold joint, show you how to avoid it, and share the fix steps with you who are unluckily in a dilemma of cold joint solder.
A cold solder joint is a defect, which results from low soldering temperature, short soldering time, and half-melting soldering during PCB soldering. Örneğin, the temperature of filler metal between base metal is under the lowest requirement of wetting temperature. Ara sıra, wetting happens in part of a whole, leading to incomplete metallurgical reaction.
Genel konuşma, its surface looks like mandarin orange’s. And joint distances of them are in order. ancak, they are so fragile since they have a poor IMC layer. Ayrıca, the collapse height is not satisfying. If you found the above symptoms on your µBGA PCB, it properly suffers cold soldering.
Many people identify cold solder joints by visual inspection. In addition to seeing the status of the joint surface, you should check the detect surrounding solder joint at the same time, such as uneven solder, uneven coverage of bonding pad, and obvious gap between pad and pins. Mechanical inspection also plays an important role in identifying it. What you need to do is to touch the solder joint by a needle, checking whether it is loose. Electrical test is another professional way to identify it. You should use a multi-meter to check disconnection between joints. In common case, we highly recommend using multiple method to identify cold solder joint.
In the process of SMT PCB, improper setting of temperature change for reflow soldering machine lead to a rocket or a plummet temperature. Bu nedenle, tension of soldering paste in the machine is uneven during physical transformation, resulting in solder cold joint. bunlara ek olarak, factors like solder shaking during cooling and mismatch between the component shape and joints position can lead to sold cold joint.
Hayır. Cold solder joint will lead to malfunction of PCB. There will be bad contact in the circuit because joint is important connection point between each components. Once its quality fails, components don’t link well together, leading to open circuit. Dahası, if cold solder joint takes charge of the connection to the signal wire or ground, the PCB may suffer signal interference during signal transmission.
Merak etme. Here are some good tips on preventing it.
If cold soldering still happen, don’t worry. We have some useful fix suggestion step. ortak, itsfixing is about metal surface maintenance.
Adım 1: Clean oil and dust in the surface of joint.
Adım 2: Preheat related area by heat gun or fire till the temperature of metal reach proper value for soldering.
Adım 3: Heat the filling material, such as cold solder alloy, to the form of liquid. Sonra, apply it on the solder joint.
Adım 4: Fit the filling material into the joint evenly and make sure that it is combine to the original metal completely.
Adım 5: Adjust the fixing area and the whole shape of the solder joint.
Adım 6: Cooling and cleaning the joint.
After conducting testing towards the circuit, you can be confident of your PCB.
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