At present, the common marking methods of auto parts in the market include mold casting, electric corrosion marking, self-adhesive, screen printing, pneumatic marking and laser marking. Although laser marking technology was born the latest, it has been widely concerned with its indelibility since its birth.

　　The main advantage of using laser for marking auto parts is that it is a fast, programmable and non-contact process, which is durable and usually not affected by the steps required in the production process or the harsh field environment. Of course, it also has disadvantages, such as high initial cost of laser marking equipment and insufficient contrast in some applications (such as marking plastic products).

　　Laser, bar code and QR code are widely used in auto parts traceability

Bar code and two-dimensional code are popular technologies for product traceability in various forms, which are fully applicable to all kinds of auto parts. The early marking of auto parts mainly depended on the serial number on the products to meet the traceability requirements. After the birth of bar code, it was quickly applied to the identification of auto parts. However, due to its small amount of information and poor fault tolerance, it did not get a comprehensive popularity. This problem was not solved until the birth of two-dimensional code technology.

QR code is a 2D figure similar to a chessboard, which can contain a large amount of information in a very small area. Because the 2D graphics of QR code only require a contrast ratio of 50% or less in readout performance, the use of QR code graphics greatly increases the number of laser applications.

The coding of QR code also has a built-in correction function. Even if part of the code is damaged for some reason, the code can still be read out. QR code can also adopt several different forms of decoding and encryption, and put protective devices in the data, making this type of mark more valuable to patented components. In addition to automatically generating bar codes, the marking software also supports two-dimensional code technologies such as DataMatrix, PDF417, QR code, etc.

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