Linchuan Precision specializes in the production and development of SMT steel mesh
Focus on improving the pass through rate for SMT Enterprises
Lower production cost
0755-29749682
18928403435
Focus on Improving Direct Pass Rate for SMT Enterprises
Lower production cost
Industry news
Your present position:Home / News / Industry news

Three Common Problems in SMT Laser Steel Mesh Welding

Source: Linchuan Precision  Article author:Linchuan Precision  Time:2019-10-08 13:59  Read: 845

When the distance between the pads or the printed wires is 0.13 mm, the diameter of the solder balls may not exceed 0.13 mm, or more than five tin beads may not appear in the range of 600 mm square. The reasons are as follows:

1. The screen printing hole and the pad are not aligned, and the printing is not allowed to make the solder paste stain the PCB.

2. The solder paste is exposed too much in the oxidizing environment and the moisture in the air is too much.

3. The heating is too slow and uneven.

4. The heating rate is too fast and the preheating interval is too long.

5. The solder paste dries too fast.

6. Flux activity is not enough.

7. Too much small tin powder.

8. Flux volatility is not appropriate during the reflow process.


Open, the solution is to pre-solder the solder on the pad. The pin suction can be prevented by slowing down the heating rate and heating the bottom surface less and heating less. The cause of this problem:

1. The amount of solder paste is not enough.

2. The coplanarity of the component pins is not enough.

3, tin is not wet enough (not enough to melt, poor fluidity), tin paste is too thin to cause tin loss.

4, the pin is sucking tin (like the wick grass) or there is a connecting hole nearby.


SMT laser steel mesh

Solder Balls, the process standard for solder balls: When the distance between the pads or printed conductors is 0.13 mm, the diameter of the solder balls should not exceed 0.13 mm, or more than five tins should not appear in the 600 mm square range. Beads. The reasons are as follows:

1. The screen printing hole and the pad are not aligned, and the printing is not performed, so that the solder paste stains the PCB.

2. The solder paste is exposed too much in the oxidizing environment and the moisture in the air is too much.

3. The heating is too slow and uneven.

4. The heating rate is too fast and the preheating interval is too long.

5. The solder paste dries too fast.

6. Flux activity is not enough.

7. Too much small tin powder.

8. Flux volatility is not appropriate during the reflow process.

Last article:SMT Steel Net Manufacturer: Do you know what the requirements of SMT Steel Net are?
Next article:Brief Introduction to the Advantages of Laser Steel Mesh Material and Laser Steel Plate
Hot products
Linchuan Precision specializes in the production and development of SMT steel mesh
serving over 3,000 customers in 7 years
producing over 200,000 high-quality steel meshes.
Service hotline:0755-29749682/18928403435
Shenzhen Linchuan Precision Technology Co., Ltd.
Tel:0755-29749682  18928403435
E-mail:xjx.smt@163.com
Customer service QQ:254259787     591431201
Company Address: 2/F, Block C, Fengrun Building, Huafeng Second Industrial Park, Gushu, Xixiang, Bao'an District, Shenzhen
粤ICP备17051183号

Sweep up more excitement
  • 合作伙伴 :
Menu
Tel About Us Share
收缩

在线客服

  • 客服 点击这里给我发消息
  • 客服 点击这里给我发消息
  • 曾小姐
    18928403435
  • 罗先生
    18923768657
  • 扫一扫 更多精彩