PCB Soldering Process

PCB Assembly and Soldering Techniques you should know

Key Takeaways

  • The combination of PCB and soda completes the construction of the circuit by picking, placing, and assembling the parts on the board.
  • In through-hole technology, the leading or pinned electronic components are sold on board to form a circuit.
  • Wave soldering is a common method used in THT and SMT PCBA.
PCB Soldering Process

Printed circuit boards (PCBs) are an integral part of electrical equipment; without PCBs, most electrical items can simply be unused boxes. PCBs are usually made of fiberglass and are bonded together with epoxy. The assembly process of PCB and soldering completes the construction of the circuit by picking, placing, and assembling the parts on the board. Testing, testing, and feedback following PCB integration with soda make PCB produce a successful process. In this article, we will discuss the process of bonding and soldering of PCB.


PCB integration and assembly process brings the board to an active prototype. The components of a PCB assembly (PCBA) are component, soding, testing, and, finally, testing. The PCBA process can be a manual or automatic process, determined by the manufacturer in each phase.

A Brief Overview of the PCBA Process

The design of the PCB begins with the drawing of the system. From the plan drawing, the PCB structure is designed. PCB structure defines electrical connections, called traces, in circuits and in parts. Once the design of the PCB structure has been approved, it is then printed.

PCBs are made up of pieces of fiberglass material that are bonded together with epoxy. Traces made of copper are placed on the board. The parts are fixed to the board by a soldering process. The solder process fixes the parts in the allotted area using a substance called solder. A PCB with parts sold on it forms a composite PCB. Once the components are attached to the PCB, the board is ready for inspection.

There are three technologies used in the PCBA process, which we will discuss next.


There are three key technologies in the PCBA process:

  • PCBA through-hole (THT) technology: In through-hole technology, lead or pinned electronic components are sold on board to form a circuit. Tracks or terminal sections are inserted through holes or pads in the PCB and sold on the other side.
  • High-tech PCBA (SMT) process: There are two types of pads: through-hole and surface-mount. For PCBs using surface-mount pads, surface-mounted devices (SMDs) are marketed for circuit development. The solder process takes place in the same place where the part is placed with the help of solder paste.
  • PCBA Mixed Technology Process: As circuit design becomes more complex, it is not possible to adhere to only one type of circuit. For PCBs that see complex circuits, there are both through-holes and devices that rise to the top. Such PCBs using composite components are called hybrid technology boards, and the assembly process is a PCBA multimedia process.


The sequence of PCBA processes varies with the mounting technology used. Let’s take a look at the steps to assemble a PCB for hole technology.

  1. Partial Layout: In PCBA hole technology, the engineer begins by replacing the parts as provided in the PCB design files.
  2. Inspection and Preparation: After all the components have been installed, the inspection is done on board. The test checks whether the parts are correctly placed. If the components are found to be incorrectly installed, such issues are promptly corrected by the corrective action. The inspection and repair must be completed prior to the sale process.
  3. Soldering: The next step in the process is soldering, which fixes the parts placed on their corresponding pads.
  4. Inspection: Once the PCB assembly and assembly process is completed, the board is taken for inspection. Every PCB board used in electrical equipment has passed this process and passed the test.

There are a variety of pasting methods available, and we will explore a few below.


Regardless of the mounting technology used, the attachment process is involved in all PCBA processes. There are many different types of PCB adhesive techniques, including:

Wave soldering – In the installation of wave soldering, the PCB is carried over a wave of hot liquid, which tightens and fixes the components. It is the most common method used for THT and SMT PCBA.

  • Braze soldering – In the installation of the braze, the metal parts are fastened with heat. However, this process melts the metals down to the filling metal. Braze soldering uses very high temperatures and produces very strong joints.
  • Reflow soldering – The reflow soldering process attaches parts to the board using a hot soldering adhesive. The soldering paste in its melting state attaches the pads and pins to the PCB.
  • Soft soldering – In the soft soldering process, a metal space filling made of tin-lead alloy is heated by an electric torch or gas to fix parts to the board. Soft soldering is a popular method for fixing composite, weak parts on a printed circuit board.
  • Hard soldering – Hard soldering is used to assemble metal parts such as copper, brass, silver, or gold at a temperature of about 600 ° F. Hard soldering produces stronger joints than soft soldering.

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