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How to judge the quality of a car sheet metal?
2019-05-31 16:05:47

Generally speaking, we can judge from two aspects: body and surface panels. Next, let's say one by one, but there's one thing to note. Here's the method you can use as an ordinary car buyer to go to 4S shop. Because it doesn't involve special tools, it's not professional, but you can generally understand the quality of automobile sheet metal parts by virtue of them.



The role of the car body is self-evident, as a place for cargo and passengers, whether it is strong or not is an important indicator to measure its performance. In order to make the body stronger, the use of high strength steel is on the one hand, and on the other hand, depends on the quality of sheet metal, which is mainly reflected by the strength of the connection.



As we all know, there are several ways of body connection: resistance welding (spot welding), laser welding, riveting, glue coating, plasma welding, etc. At present, resistance welding and laser welding are mainly used in automobile manufacturing industry. They are different in welding principle, so the sheet metal effect of automobile body is not the same.

Laser welding has been talked about in the media circle in recent years, and it has become a selling point of many cars that are often mentioned in sales. The so-called laser welding is an efficient and precise welding method using high energy density laser beam as heat source. The welding process belongs to the heat conduction type, that is, laser radiation heating the surface of the workpiece, and the surface heat diffuses to the interior through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, the workpiece melts and forms a specific molten pool.



However, compared with laser welding, resistance welding (known as spot welding) appeared earlier and has a wider application. Resistance welding is a method that the welding workpiece is pressed between the two electrodes through the electrode arm of the welding torch and applied with electric current. It is heated to a melting or plastic state by the thermal effect of resistance produced by the current flowing through the workpiece contact surface and adjacent areas, so as to form a metal bonding.

How to separate the two kinds of welding? In fact, it is very simple, if the welding position is a smooth weld is laser welding, a welding spot is resistance welding, these two welding methods are used in many parts of the body, such as the roof and side.


العلامات ذات الصلة: Automotive Body Parts

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