Common bad habits of electric soldering irons and their impact
In the soldering process of electronic components, many technicians feel that they need to press down hard to transfer more heat to complete the soldering when encountering difficult soldering joints, but pressing the soldering iron down hard does not heat the joint faster. Whether you press hard or not has nothing to do with the speed at which the tip of the soldering iron transfers heat. Excessive force will also cause some very troublesome consequences, such as white spot pads lifted or deformed. Such solder joints may initially pass the electrical test, but its connection strength has weakened. It will lead to intermittent failure of future products or paralysis of the entire system.
It is important to realize that excessive force is completely unnecessary to achieve a successful weld. The correct way to do this is to lightly, loosely but maintain good contact with the joint to form a good solder joint. Technicians are usually because the heating tip of the soldering iron is oxidized, which slows down the heat transfer. No technicians usually increase the downward pressure on the tip of the soldering iron unconsciously because the heating tip of the soldering iron is oxidized, which slows down the heat transfer. Reduce Oxide Formation or Reduce Contamination to the Iron Tip Oxide acts as a barrier or a blocking object in the sense that it slows down the transfer of heat.
(2) The type of soldering iron head is not suitable
If the heating tip is too small, it may cause insufficient solder flow or cold solder joints. It also increases the heating residence time, that is, the contact time of the soldering iron with the joint. When welding with a conical heating head on a larger area of the connection, the dwell time has to be increased due to poor heat transfer. Excessive dwell time of the soldering iron tip may damage the device, conductor or circuit board. , if the heating head is too large, it will exceed the connection area and damage the substrate of the circuit board.
The three factors in selecting a heater tip are the contact area, the thermal capacity of the heater tip, and the length and shape. When choosing a heating head, always choose the heating head with the largest contact area without exceeding the welding area. A flat chisel tip has a much larger contact area than a conical tip. All we have to do is maximize the contact area between the tip and the pad so that the joint can be heated quickly.
