In general, we can judge from two aspects, namely: body and surface coverings. Next, we will talk about them one by one, but there is one point to note. Here is the method you can use when you go to a 4S shop as an ordinary car buyer. Because it does not involve special tools, it is not professional, but with them you can generally Understand the quality of automotive sheet metal parts.
The role of the body is self-evident. As a place for accommodating cargo and passengers, whether it is sturdy or not is an important indicator to measure its performance. To make the body stronger, the use of high-strength steel is on the one hand, and on the other hand, it depends on the quality of the sheet metal, which is mainly reflected by the strength of the connection.
We all know several body connection methods: resistance welding (spot welding), laser welding, riveting, gluing, plasma welding, etc. At present, resistance welding and laser welding are mainly used in automobile manufacturing. They are different in welding principle, so the effect of sheet metal from the body is not the same.
In recent years, laser welding has been talked about in the media circle, and it has become a selling point of many models that are often mentioned by sales. The so-called laser welding is a high-efficiency and precise welding method that uses a high-energy-density laser beam as a heat source. The welding process is a heat conduction type, that is, the surface of the workpiece is heated by laser radiation, and the surface heat diffuses to the interior through heat conduction. Parameters such as energy, peak power and repetition rate, melt the workpiece to form a specific molten pool.
However, compared to laser welding, resistance welding (also known as “spot welding”) appeared earlier and has a wider range of applications. Resistance welding is to press the workpiece to be welded between the two electrodes through the electrode arm of the welding gun, and apply a current to heat it to a molten or plastic state by using the resistance heating effect generated by the current flowing through the contact surface of the workpiece and the adjacent area. A method of forming a metal bond.
How to distinguish these two kinds of welding? In fact, it is very simple. If the welding position is a smooth seam, it is laser welding, and if it is a single welding spot, it is resistance welding. These two welding methods are used in many parts of the body, such as the roof and side walls.
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