Types of PCB Soldering Process You need to Know

Types of PCB Soldering Process You need to Know

When it comes to the PCB manufacturing, several steps are involved. From designing the PCB to assembly and finishing, there are many vital manufacturing stages.  
During the assembly, various types of PCB solder are used to fix the components. Soldering is one of the vital steps that help mount one or more components on the board. It is done on a number of electrical projects to combine the elements with the roots of the PCB board.  
To help you understand more about the PCB soldering process, here are a few things you need to know.  

What is a solder? 

Solder on the Printed Circuit Board is the connective tissue. It is like a glue that sticks elements to the substrate and ensures continuity to the printed circuit board. Hence, the soldering process is an essential step in PCB manufacturing.  
There are different kinds of solder used in the manufacturing process. However, the main ones used lead-based, lead-free, and flux core solder.  

Different Methods of Soldering 

The main methods of the soldering process are classified into two, soft Soldering and hard Soldering.  

Soft Soldering 

Soft Soldering is a simple process for fitting each compound part that has been broken when Soldering is performed at a high temperature. Hence, this is a process that is done at a low liquefying temperature.  
During this process, a tin-lead alloy is the space filler metal. However, the liquefying temperature should not be less than 400oC/752oF. The technician uses a gas torch as the heat source.  
Examples of soldering metals used include tin-zinc for bonding aluminum, zinc-aluminum for aluminum, tin-lead for general usage, and cadmium-silver for power at high temperatures.  

Hard Soldering 

Hard Soldering is a process where a solder unites two metal components by dispersing them out into the holes of the element unlocked due to high temperature. It comprises two parts, namely silver Soldering and brazing soldering.  

Silver Soldering is a new method that uses a blend containing silver as a space-filler metal. However, silver is not recommended for space-filling, even though it provides a free-running individuality. So, for accurate silver soldering, a different flux is recommended.  

Braze Soldering – braze soldering is when two terminals of base metals are connected by forming a liquid metallic space filler, there are two types of brass in the industry. This procedure is recommended because it provides a solid joint. The bass metal is used as a space-filler agent.  

Needed tools for Soldering 

1. Soldering IronIron – this is one of the main tools for Soldering. It is used as a heat source for the liquefying solder. Soldering guns can be used for simple PCB jobs, 15W to 30W. But when soldering heavy components, a soldering iron of advanced wattage is needed.  
The soldering IronIron is a device that you can use to solder electronic elements by hand. It disperses heat to make the solder softer and ensure it sprints into the breaks.  

2. Solder Flux – this is a purifying agent in the soldering process. A soldering flux offers various functions, such as eliminating rust from the components that need to be soldered, closing air out to get rid of extra rust, and enhancing the dripping individuality of the fluid solder.  

3. Soldering Paste – this is a soldering cream used to connect the leads of involved chipsets to connection ends in the PCB blueprint.  

Step-by-Step Soldering Process 

Below are the vital steps of the soldering process.  

1. Begin with the small components, taller elements, and connecting wires. 
2. Then place the element into the printed circuit board, and make sure it goes the correct way around.  
3. You need to twist the leads to make sure the part is secure 
4. The soldering Iron should be warmed up. Therefore, ensure it is ready, and use a moist sponge to clean the tip.  
5. Now, place the soldering IronIron on the element of the pad, and the solder’s end should be on the board.  
6. Remove the solder and the soldering IronIron from the circuit board.  
7. Then allow the terminal to cool for sometime 
8. Use a cutter to get rid of excess components terminal 

Essential Soldering Tips to Note 

With a lot of practice, the soldering process is something you can execute. However, you need to understand that things can go wrong. Here are a few tips to consider to help you learn more about Soldering.  

1. Use Heat Sinks 

Heat sinks are essential for joining wires of susceptible devices such as integrated circuits and transistors. You can use a clip, but a pair of pliers is a good choice if you do not have one.  

2. Ensure the iron tip is clean

When the iron tip is clean, this indicates the conductivity of an enhanced heat and offers a better joint. Hence, use a wet sponge to clean the information. Also, make sure the tip of the solder is well-tinned.  

3. Check the joints 

When collecting complex circuits, it is vital to confirm the joints once they have been soldered.  

4. Solder the tiny parts initially 

It is important to solder the tiny parts at the start. Therefore, solder diodes, jumper terminals, resistors, and other tiny parts before moving to the larger parts such as transistors and capacitors. This will make assembling a bit easier.  

5. Connect the most sensitive elements at the end of the process 

To avoid damaging the sensitive elements while connecting with others, it is good to connect them at the end of the process. So, put CMOS, MOSFETs, and other sensitive parts at the end.  

6. Have sufficient ventilation 

During the soldering process, you need to ensure you have sufficient ventilation. This will ensure you do not breathe the smoke formed. Also, you will provide the room you are operating in with enough air.  


Soldering is a vital process in PCB manufacturing. With the above information about Soldering, tools, and tips, you now know what is needed during the process. Nevertheless, make sure you are working in a clean and well-ventilated room.

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Types of PCB Soldering Process You need to Know Types of PCB Soldering Process You need to Know Reviewed by Author on May 15, 2022 Rating: 5
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