PCB Tech - Inside the PCBA processing and production process

I want to have a comprehensive understanding of the preservation and management of components, PCB processing and SMT placement, and subsequent testing and inspection, but some insiders are not necessarily known! During the production and processing of PCBA processing factories, we must pay attention to the following two points. There are many inside stories that you don’t know, and you need to understand them. They are mentioned in the following two points. I hope that after reading the following two points, it will be helpful. .

There are those unknowing inside stories during the production and processing of PCBA processing plants

1. Recycling of tin dross

SMT patch and DIP plug-in post-welding will produce some waste, of which tin slag is a major part of the waste. And because tin slag itself is harmful to the human body, this tin is not the tin that our body needs. The tin used in patch processing is tin-based tin-gold compound, so the price itself is not cheap, so tin slag After production, the regular PCBA factory will collect it in a special storage container and store it separately. Then hand it over to a company that specializes in tin slag recycling.

However, in order to save production costs, many PCBA manufacturers will directly return the tin slag to the DIP plug-in and then solder it. This is what many companies will do, but it will not be stated on the surface. It is also something that few people know in a factory.

PCBA processing

There are those unknowing inside stories during the production and processing of PCBA processing plants

2. Material loss rate

Many customers may know it. Assuming that 100 sets of products are produced by oneself, generally a very standardized project will give a loss table based on the BOM list on the entire PCBA circuit board. The above will show which material is a wearing part and which material is a non-wearing part. In the purchase of vulnerable parts, more materials will be prepared in order to maintain the entire order to be completed on schedule. After all, because of the loss of several materials, the delivery time of the product cannot keep up, which is also undesirable.

So generally experienced customers will prepare this information in advance. In fact, this information has already explained to the PCBA manufacturer the ability to withstand losses. Don't exceed expectations, you won't be able to keep up after the delivery date. Therefore, manufacturers will also pay great attention to this matter in the SMT patch processing.

Normal customers have certain requirements for purchase orders. Of course, there are some customers who do not mention anything. Then they encounter irresponsible factories, and then a so-so operator will wait for the 100-piece board to be completed. There are only 90 pieces, and the rest is 10 pieces, etc. These worn-out parts are filled up and welded by hand. Therefore, it is necessary to clearly explain the requirements of the business or project directly connected to the PCBA factory before production. The final result is different if you make a request and don't make a request!