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Industry News
Selection basis and management of solder paste
Sep 28, 2022
09-28
2022
Solder Paste Selection Basis
1. High-reliability products require high-quality solder paste, depending on the product's value and use.
2. The alloy composition of the solder paste is selected according to the assembly process of the product, the printed board and the components.
(1) Commonly used solder paste alloy components: Sn63Pb37 and Sn62Pb36Ag2.
(2) Components with poor solderability of gold or silver thick film terminals and pins should select silver-containing solder paste.
The price difference of lead-free solder wire with different components
Sep 28, 2022
09-28
2022
The price of tin wire is mainly determined by its alloy composition, technical difficulty and production difficulty. The more commonly used lead-free tin wires in the market include silver-containing lead-free tin wires and conventional lead-free tin wires. Silver is a precious metal, so the higher the silver content of the tin wire, the higher the price. The composition of conventional lead-free tin wire is Sn99.3%Cu0.7%, which is the lowest price lead-free tin wire. In terms of technical difficulty, because the market is very mature, it is not very difficult.
Overview and requirements of solder paste
Sep 27, 2022
09-27
2022
Solder paste is also called solder paste. For the introduction of solder paste, solder paste is divided into unleaded solder paste and leaded solder paste. The solder paste produced by double Chile solder paste manufacturers is a 500-gram can, and the lead-free environmental protection is a green plastic can. Leaded for white plastic cans
How to detect solder bar degree
Sep 27, 2022
09-27
2022
There are many kinds of solder bars, only lead solder bars have more than ten kinds from 15-63 degrees, but the outer packaging is marked with 63/37 molds. It is difficult for non-professional personnel to see the difference between them. Below we will introduce the inspection method of solder strip degree in detail:
1. Identify from appearance
The solder bar has two sides, and the front usually has some company, parameters and other product logos. The backside of the solder bar below 45 degrees usually has a dim light. The surface and back of the 63/37 solder bar have a glossy surface with a bluish-white color below 45 degrees, which can be easily identified based on this phenomenon.
What are the regulations for the use of solder paste?
Sep 26, 2022
09-26
2022
Rules for the use of solder paste:
1. Take the solder paste out of the refrigerator, put a "control use label", and fill in the "thawing start time and signature". The solder paste must be completely thawed before opening the lid for use. The thawing time is 6 to 12 hours.
2. Before using the solder paste that has been opened, you must first understand the opening time and confirm whether it is within the validity period of use.
Analysis of lead-free environmental protection tin bar welding
Sep 26, 2022
09-26
2022
We often encounter many problems in welding. Let's talk about the following reasons why the solder joints do not shine after the lead-free environmental protection tin bars are welded:
1. The tin content of the lead-free environmental protection tin bar determines the brightness of the tin point. The surface of the tin and lead-tin metal elements, which are part of the tin bar, has a bluish white luster, while the surface of the lead metal element is gray. The higher the tin, the brighter the tin point. On the contrary, the higher the lead content of the solder bar, the duller the tin point.
Reasons for poor scratching of lead-free solder paste
Sep 23, 2022
09-23
2022
The scraping pit is in the process of solder paste printing, the scraper moves back and forth continuously, the scraper scrapes the lead-free solder paste at the opening of the stencil to form poor scraping, and the solder paste at the opening of the stencil is scraped away. This will lead to less tin on the circuit board. After reflow soldering, the solder joints with less tin have insufficient welding strength and lack the proper support for electronic components, resulting in welding defects. The occurrence of scraped pits and less tin can first rule out the reasons for the product quality of lead-free solder paste manufacturers. Usually, poor scraping pits are closely related to the processing process of SMT manufacturers. This defect is found in the actual process of bad production lines. It has a greater relationship with the solder paste printing stencil and the squeegee.
Matters needing attention in the health and safety of lead-free solder wire
Sep 23, 2022
09-23
2022
Solder wire is an important industrial raw material for connecting electronic components in welding lines, and is widely used in the electronics industry, home appliance manufacturing, automobile manufacturing, maintenance industry and daily life.
This product does not contain regulated specific chemical substances, nor does it contain organic fluxes as specified in the Organic Poisoning Prevention Rules, but necessary precautions are still required to ensure human health and safety.
Melting point of lead-free low temperature solder paste
Sep 22, 2022
09-22
2022
In the whole soldering industry, there are many styles of solder paste, not only low temperature, but also medium and high temperature solder paste. There are even solder pastes with a high temperature of more than 300 degrees and 400 degrees. Today we talk about the melting point of low-temperature solder paste. It is common sense that the melting point of low-temperature solder paste is 138 °C, which is called low-temperature solder paste. Compared to 6337 eutectic solder paste at 183°C, its temperature is very low. This solder paste is generally used in the low-temperature SMT reflow process.
Analysis of the Causes of Soldering Points of Flux-cored Tin Wires
Sep 22, 2022
09-22
2022
Analysis of the reasons for the solder joints of flux cored tin wires:
1. The flux is in poor contact with the bottom surface; the floor and the welding angle are improper
2. The specific gravity of the flux is too high or too low, and the original bottom plate and leads are not handled properly.
3. The transmission speed is too fast or too slow; the standard speed is 1.2-1.5M/min. When it is too fast, the solder joint will be sharp and shiny; if it is too slow, the solder joint will be slightly round and stubby;
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