Laser welding joint quality evaluation standard
1. Common internal quality evaluation standards for automotive body laser welding heads
The quality defects of welded joints are generally divided into two types: surface defects and internal defects of welds. Surface defects are generally visible. Internal defects cannot be visually observed. They must be observed and discovered through corresponding technical means, such as microscopic metallography. Analysis and other means of observation.
2. Common quality evaluation standards for the outer surface of laser welding head of automobile body
Weld seams must meet the following requirements when reworking: Be careful not to affect the functional size changes and design requirements of the assembly. After rework, the dimensional stability of the body assembly, better surface accuracy and better joint corrosion resistance can be guaranteed. . In addition, the welding area is not allowed to be welded during the repair, so as to avoid unnecessary welding deformation and affect the quality of the welded repair joint. In the case of short flange edges (less than or equal to 8 mm), or areas that cannot be drilled and reworked, use a fillet weld at the lap joint or MIG or plasma braze at the butt weld. The length of the weld to be repaired must be at least equal to the length of the weld defect location. When repairing by means of arc brazing (MIG, WIG, Plasma), the weldability of the base metal must be analyzed beforehand. For example, the yield strength and the breaking strength are analyzed by drawing experiments, and the welds and welds are analyzed by metallographic means. And the organization and morphology of the heat affected zone. In the case of some special impossible repairs, such as the body that deforms the assembly due to heat during the connection, the repair method for heating the base material according to the standard is not allowed, and the method of cold glue bonding must be considered. Or other cold processing methods.
As a well-known automobile manufacturing enterprise in China, FAW-Volkswagen has always guided the development direction of domestic automobile manufacturing technology with technology leadership. The development and utilization of laser welding and its composite welding technology is an important symbol of the qualitative leap of FAW Volkswagen's body manufacturing level. Laser welding and its composite welding technology are one of the most advanced welding methods at present, achieving a perfect combination of higher welding speed and better welding quality, shortening production time and improving production efficiency, making FAW-Volkswagen's products have Stronger trust and market competitiveness. With the gradual deepening and improvement of the laser joint design and joint welding defect solutions that meet the product design requirements, FAW-Volkswagen is also widely used in this advanced welding technology.
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