Recently, many manufacturers are taking their body crafts, welding levels, etc. to enhance their brand and image. Consumers are paying more and more attention to the deeper level of power, performance and appearance. Today, we will say The welding process of the car.
The car body is a roll of steel plate. After stamping, it forms the shape of the door and the roof. These parts need to be welded together. They were all done manually. Nowadays, the technology is developed, and the advanced factory basically No one needs to operate, and the robotic arm replaces manual operation.
The welding standard is good for the consumer, the weld is small (beautiful), the welding strength is high (safe), and now the most talked about on the network is: 1. Is the integrated stamping door safer than the welded door? 2. Is laser welding of the body higher than conventional spot welding? Today is the topic for these topics.
The integrated stamping door refers to the relationship between the door panel and the window frame. The integral stamping is a whole as the name suggests, and the welded door is the window frame and the door separated, and joined together by welding. It is not clear whether there is any trace of welding between the window frame and the door when welding the door, and if it is welded.
Generally speaking, the more expensive the car has a more efficient door, so everyone thinks that the welded door is not as safe as one. But in fact, many models with high collision safety scores are using welded doors, such as Fox, Carnival, etc., are welded doors.
From the senses, the welding looks less solid than the one, which is a visual phenomenon, but the welded parts are generally more rigid than other parts, but if the welding technique is not good, it will cause partial brittleness. It is easy to break when it causes an impact.
One-piece stamping doors require the use of high-strength steel, and high ductility is achieved by losing steel strength (relatively speaking, it is not that the strength of the steel of the integrated stamping door is weak). Therefore, the most important factor in determining safety is the design of the anti-collision steel beam skeleton and the strength of the door steel plate. If these two foundations are better, there is not much relationship between the ones.
I just said what everyone thinks about the car door. Now speaking about the laser welding process, this is not a new process. It is more suitable in the early years, but more and more car manufacturers are using this process. And they are all taking laser welding to say things, even some netizens said that the roof has a sealing strip is not a good car (the general laser welding roof has no sealing strip, but there are also examples), this is really sweaty.
So, what is laser welding? Is he just sought after because of its beauty?
Laser welding is a highly efficient precision welding method that uses a high energy density laser beam as a heat source. Since continuous laser welding does not require the use of sheet edge stack welding as in the conventional spot welding process, it is often used by automobile manufacturers for welding between the roof and the body, and has the advantages of good appearance, sound insulation and good sealing.
Laser welding forms a weld, the length and width determine the maximum tensile force of the weld, while spot welding controls the maximum tensile force by the density of the weld. From a local point of view, laser welding is not necessarily the largest than spot welding. The tensile shearing force is large, but the laser welding is seamless. The spot welding gap of the general car manufacturer is not limited to one, which is about 18/m, and the density of the soldering spot is not too large. The steel plate will also curl up. Therefore, continuous laser welding is generally stronger than spot welding, while spot welding produces gaps between welds.
According to the contents mentioned in the "Comparative Analysis of Laser Beam Welding and Resistance Spot Welding of Automotive Parts" by the Automotive Laboratory of Hunan University, we know that the maximum tensile shear force of a solder joint in the spot welding process is 5.301kN, while the laser The maximum tensile shear force of the same length of welding is 4.334kN. It can be seen that the spot welding is stronger than the laser welding alone, and if it is calculated according to 18 welding points per meter, the difference can be too large.
Many people say that the steel plate will be torn when the car hits. This is the quality problem of the steel plate. Actually it is not. If the steel plate is good, it will be deformed by external force, and the main problem occurs in the gap I just mentioned. If the gap between each solder joint is utilized by an external force, it is possible to damage the adjacent solder joint due to the tension, thereby damaging the entire steel sheet.
Because the laser welding operation is very toxic and dangerous, and requires a separate and closed working area, the installation of the equipment in the old factory will face greater difficulties, which also makes the cost much higher. Laser welding is applied to the roof of the car, and it will take a while to see all the laser welding.
Comments: For the current welding and body crafts, manufacturers are innovative, but often need to adapt to local conditions, make the best use of the technology, so there is a difference in the process, regardless of the manufacturing process, the ultimate safety is the most important of.
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