Soft soldering is a process used for attaching small components onto the larger PCB. These small components will usually have a low-liquefying temperature that will begin to break down under the high temperatures of the heat source. Rather than simply melting the component, however, an additional step must be used to attach the component to the board. In this case, this extra step is a filler metal, which is typically a tin-lead alloy.
Hard soldering is a process that uses a solid solder to join two different metal elements together by spreading throughout the holes of the components that become unlocked as they’re exposed to high temperatures. As a process, hard soldering is made up of two smaller sub-processes known as silver soldering and brazing.
What are the tips of processing best PCB solder?
- What is the difficulty of best PCB soldering?
Here’s the problem: Training focuses on the desired appearance of solder rather than how the connection is achieved. And “acceptable” appearance may hide failures in waiting. How the connection was made determines not only whether the solder connection itself is reliable but whether catastrophic damage was inflicted on the component being soldered. At soldering iron temperature, solder will stick to oxides and contaminants to produce a visually acceptable connection.
What are the PCB soldering defects?
The ban on lead in electronics changed our business profoundly by eliminating tin/lead component surfaces. Meanwhile, tin plating has become increasingly uncommon because of concerns about tin whiskers with pure tin. The new component surfaces are not tin or tin/lead; they are metals with higher melting temperatures that do not reflow during application of the solder. In other words, these are metals that are soldered, not reflowed. And the surfaces must be thoroughly deoxidized before solder is applied.
- How to avoid soldering bridge?
A solder bridge is formed when two points on the circuit board that should not be electrically connected are inadvertently connected by solder during PCB soldering. This will form an electrical short circuit, which may cause various damages, depending on the circuit structure. A solder bridge can be fixed by holding your solder iron in the middle of the bridge to melt the solder, and drawing it through to break the bridge. If the solder bridge is too large, excess solder can be removed a solder sucker.
- What is the diameter of PCB best soldering?
The gauge number determines the diameter of the solder. A gauge number is a unit of thickness for metal sheets and wires. For amateur and hobbyists, gauge numbers 18, 20, and 21 are the numbers that work well. The diameters of these numbers are 1.22, 0.914, and 0.813 mm, respectively. Staying in this range is a good idea for amateurs and beginners. Using wires of this diameter reduces solder wastage.