How Can You Use a Heatgun Safely for Rework and Repair?

What Is a Heat Gun?

What is a heatgun? Hot air rework? It's easy. To remove or reposition an integrated circuit, you simply heat the pins at the same moment. Hot air stations can do the job better than a traditional welding iron.

A rework station has a simple design. Its main function is to supply air to the spraygun. The coil inside the spray gun reaches high temperatures during operation, and heats air as it passes.

Most heat guns have a large nozzle of about 1 cm diameter. The nozzle is mounted at the end of the gun to limit the path through which air can enter. Airflow can be increased by reducing the size the nozzle.

You can create a hot and sharp airflow this way. This airflow can be used to heat up a particular area of the board and melt the pins. It also allows you to melt several pin connections simultaneously.

Let's look at an example of a multi-pin SMD (such as a LM1117 variable Voltage Regulator in a SOT-223 Package). Imagine that the component has been damaged by reverse voltage, or for other reasons. It needs to be replaced.

The IC should be removed completely from the PCB. People often believe that different sized components need different sized nozzles. In reality, however, we install a simple round nozzle and don't change it while using the device. The air will then heat up a greater area of the PCB.

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