Soldering training. Theory and praxis

Just like hand soldering, the repairs, reworks and modifications on products are an inevitable part of the electronics business.

In Compendia d.o.o. we are fully aware of the importance of quality soldering and repairs. Take a look at some of the most common and most problematic problems and our solutions.

Point soldering is the a basic soldering technique when it comes to soldering SMT components or fixing components which display”tombstoning” effect.

It is important that the pad is heated and solder is afterwards applied to a pad, not to a component terminal. Once the one terminal has been soldered the terminal and the other pad are being simultaneously heated so the good solder meniscus is produced.

Special attention has to be paid so the correct solder tip and adequate temperature are chosen in order not to damage the board, pad or component.

The complexity of rework rises with the miniaturisation of SMT components. However, provided with right equipment we’re able to teach you how to perform point soldering of 0201 components.

Torn off pad is a common problem which occurs when printed circuit boards (PCBs) are poorly handled. Pads get torn off when an intense outward force is applied to a component terminal so it pulls off the pad and physically detaches it from the board.

The problem becomes even more serious if the value of the board is high or if new, intact board is hard to obtain. In that case a process called “pad replacement” has to be performed.

Torn off pads are replaced with generic pads which are fixed to a PCB and the remaining of the trace. In case that a trace has to be regenerated as well a solder resist has to be applied over a generic trace. Once the pad is replaced the new component is being soldered.

Component replacement is one more common intervention. Various components has to be replaced due to the electrical or physical damages. Some of them has to be taken down and re-soldered again due to the software issue and re-programming which they need to undergo.

In this particular example the component had to be reprogrammed and therefore a special attention had to be brought to the thermal stress of the component, so the correct temperature and exposure time had to be chosen thus preserving coplanarity of component’s terminals.

Soldering training consists of two parts – theoretical where all aspects of rework are being explained and practical where the real rework is done and techniques are presented. Training is suitable for up to 5 people and usually lasts up to 4 hours. However, we are able to offer you a tailored training which would cover the challenges your team usually stumbles upon or. More information regarding the training are available upon request.