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What are the requirements for surface mount solder paste?
Sep 16, 2022
09-16
2022
With the application of reflow soldering technology, solder paste has become an important process material in surface mount technology (SMT). Connections to pads on the board. Solder paste coating is a key process in surface assembly technology, which will directly affect the soldering quality and reliability of surface assemblies. Solder paste is required to have different properties in different processes or processes of surface assembly in PCBA processing. We have collected some information to summarize the following points:
What is the role of flux in lead-free tin wire?
Sep 15, 2022
09-15
2022
As we all know, the soldering of lead-free tin wire is more difficult than the soldering of lead-tin wire. When transitioning to a lead-free process, we need to have an in-depth understanding of some of the characteristics of lead-free tin wires in order to achieve good work. Therefore, before working, it is necessary to remove the dirt, metal oxides, other impurities or gas layers attached to the metal surface.
Lead-free solder bar rosin usage specification and dip soldering
Sep 15, 2022
09-15
2022
Rosin is a common additive in lead-free tin bars, so rosin will not cause conduction. It is an insulator itself, but the content of the auxiliaries of lead-free solder bars contains rosin but other active substances. Lead-free solder bars Excessive metering of some active substances may cause leakage.
Matters needing attention after the solder paste is opened
Sep 15, 2022
09-15
2022
In the production and manufacturing process of the manufacturer, in principle, it is necessary to avoid contact with the air as much as possible, and the less the area and frequency of contact with the air, the better. The contact of lead-free solder paste with air will cause the internal metal tin powder to be oxidized by oxygen in the air, resulting in the failure of solvents, fluxes and other components, affecting the performance. Not only is it as simple as oxidation, but the actual test results of lead-free solder paste manufacturers also show that too much contact with air will cause the flux to fail, and the solvent in the flux will evaporate into the air too much.
How to view the activity of solder paste?
Sep 15, 2022
09-15
2022
Active solder paste refers to solder paste with added active agent. Adding active agent to solder paste is conducive to soldering. The main activity in lead-free solder paste refers to the material added with active agent. It can assist heat conduction in the SMT welding process, remove metal oxides on circuit boards and electronic components, reduce the surface tension of the welded material, and remove impurities such as oil stains on the surface of the welded material. It can increase the welding area on electronic components and circuit boards. The addition of the active agent adds to the soldering performance of the solder paste. It is a very important component of lead-free solder paste. Whether it is producing leaded or lead-free solder paste, manufacturers will add varying amounts of active agents to it.
Why should solder paste be "lead-free"
Sep 14, 2022
09-14
2022
Lead-free solder paste is gradually produced with the development of the times, people's awareness of environmental protection is gradually strengthened, and lead-free solder paste has gradually entered lead-free solder paste.As we all know, metal lead is very polluting the environment. When the air, water, soil and other natural resources contain a large amount of metal lead, it will seriously endanger the human body, health and living environment. With the continuous strengthening of environmental protection efforts, metal lead is rarely allowed in electronic products. As a heavy metal, metal lead is a toxic and harmful substance.
Introduce the key factors and precautions of special-shaped tin wire welding
Sep 14, 2022
09-14
2022
After the tin wire composition is selected, the quality of the internal flux is a key factor in determining the welding quality and welding efficiency:
When using a slightly higher tip temperature, the residue should not burn or darken in color; the flux should not splatter or smoke excessively when soldering;
What are the phenomena that occur when the solder bar is welded?
Sep 14, 2022
09-14
2022
During the welding process of the tin bar, some unexpected situations will occur, resulting in poor welding. What is the reason for the tin bar to appear in these situations?
1. The flux and the bottom surface are in poor contact; the angle between the bottom plate and the liquid surface is improper.
How to prevent fumes from lead-free tin wires during soldering
Sep 14, 2022
09-14
2022
Lead-free tin wire is an alloy composed primarily of tin, but also contains other metals. It is mainly divided into lead and lead-free. Everyone knows that lead is a toxic metal, so lead-free is more environmentally friendly. Now more and more factories choose lead-free and environmentally friendly, and lead-tin wires are gradually being replaced. At present, the main products on the market are lead-free solder paste, lead-free solder bars, and lead-free solder wires. Leaded solder is mainly composed of tin and lead in various proportions; lead-free solder is composed of tin-copper, tin-silver-copper, etc. Since the composition of the alloy and the proportion of each composition are different, the melting point of different solders is also different.
Are tin wires and soldering wires the same, and what are their functions?
Sep 13, 2022
09-13
2022
Solder wire is a very important material in the electronic soldering industry, used for manual soldering of products and automatic soldering with the aid of machines. The tin wire is composed of two parts: tin alloy and flux. The alloy components are divided into tin-lead, tin-copper, etc., and the flux is evenly poured into the middle part of the tin alloy. The common classifications of tin wire are lead-free tin wire and leaded tin wire (also called lead-free solder wire and leaded tin wire); tin wires with different compositions have different melting points and corresponding uses.
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