Alpha ALPHA Solder Paste OM350 Solder Paste

Solder paste is a commonly used welding auxiliary material, composed of solder powder and rheological agents, among others. Its role is to serve as a connection between the solder and the pad during the welding process. The method of using solder paste determines the quality and effectiveness of the welding. Below is a detailed introduction to the role and usage of solder paste.

Brand: Alpha

Weight: 0.5kg

Melting Point: 217

Particle Size: 25~38μm

Color: Gray

Ordering Number: OM350

Viscosity: 160

Product Characteristics: Silver-containing solder, lead-free

Material: Tin Silver Copper

Working Temperature: 250℃

I. Role of Solder Paste:

1. Protect the Pad: Solder paste can protect the pad during the welding process, preventing damage or oxidation of the pad due to high temperature and gas corrosion, ensuring the quality and reliability of the solder joint.

2. Improve Welding Quality: The rheological agents in the solder paste have functions such as cleaning, removing oxidation, and wetting the pad, which can eliminate oxides and contaminants that may exist on the pad surface, improve the contact performance of the welding, and enhance the bonding force between the solder and the pad.

3. Facilitate Automated Production: Solder paste, through appropriate viscosity control, is suitable for processes such as printing, dispensing, and spraying on automated production lines, improving production efficiency and consistency.

4. Reduce Solder Balls and Welding Defects: The high viscosity of solder paste can reduce splashing and short circuits during use, effectively minimizing the occurrence of solder balls and welding defects.

II. Usage of Solder Paste:

1. Storage Conditions for Solder Paste: Solder paste is typically stored in low-temperature and dry environments, avoiding high temperature, humidity, and direct sunlight to prevent affecting its performance and viscosity. Additionally, it needs to be stirred regularly to maintain its uniformity.

2. Preparation of Solder Paste: Before using solder paste, it must be stirred evenly to prevent the separation of solder powder and rheological agents. Specialized stirrers or manual stirring methods can be used, with a stirring time generally of 2-3 minutes.

3. Printing of Solder Paste: Printing is a common method in the welding process. First, pour the solder paste into the stencil, then place the stencil above the welding area, adjust the printing thickness, and use a squeegee to evenly press the solder paste onto the pads while moving the squeegee. After printing, clean the stencil and squeegee promptly to prevent the solder paste from drying.

4. Dispensing of Solder Paste: The dispensing method is suitable for situations where the solder paste thickness is greater. Use specialized dispensing equipment to jet the solder paste onto the pads in the welding area.

5. Spraying of Solder Paste: The spraying method is suitable for large-sized, complex structures, or components with dispersed pads. Use spraying equipment to evenly spray the solder paste above the welding area, then proceed with welding.

6. Drying Before Welding: Before welding, the solder paste needs to undergo drying treatment to remove solvents. Generally, an oven is used for drying, with temperature and time adjusted according to the requirements of the welding materials and components, typically at 150-200°C for 10-20 minutes.

7. Welding Operation: During the welding operation, first evaporate the solvent in the solder paste through heating, melt the solder powder, and then react with the pad to form a solder joint. The welding temperature and time are adjusted according to the requirements of the welding materials and components, usually conducted at 220 250°C.

Summary: As a welding auxiliary material, solder paste can improve welding quality and ensure the reliability of solder joints. Using solder paste requires attention to its storage conditions and preparation, different application methods such as printing, dispensing, and spraying, as well as pre-welding drying and welding operations. Through correct usage methods, the effectiveness and reliability of welding can be enhanced.