Why does the stainless steel
plate deform? The application of laser welding in stainless steel occupies a very important position, especially in the automotive industry, where the body is all connected by welding. However, affected by many factors, the welding of stainless steel plates has deformation problems, and the control is difficult, which is not conducive to the sustainable development of related fields. Therefore, it is of great significance to strengthen the research on laser welding deformation of stainless steel plates. 1. Overview of laser welding Laser welding mainly refers to a welding method that uses laser energy as a heat source to melt and connect workpieces. During the laser welding process, the laser irradiates the surface of the material to be welded, and acts on it, part of it is reflected, the rest is absorbed, and enters the interior of the material to complete the welding target. In short, the process of laser welding is to use a high-power laser beam focused by an optical system to irradiate the surface of the material to be welded, and then make full use of the material's absorption of light energy for heating and other processing, and then cool to form a welded joint. a fusion welding process. Usually, laser welding is mainly divided into two categories: thermal conduction welding and deep penetration welding. 2. The hazards of welding deformation and the main factors affecting welding deformation The main factors affecting welding deformation are welding current, pulse width and frequency. When the welding current increases, the width of the weld also increases, and the phenomenon of spatter gradually occurs, which leads to oxidation deformation on the surface of the weld, accompanied by a rough feeling; the increase of the pulse width increases the strength of the welded joint. When the pulse width reaches a certain level , the heat conduction energy consumption on the surface of the material also increases, and the evaporation causes the liquid to splash out of the molten pool, resulting in a smaller cross-sectional area of u200bu200bthe solder joint, which affects the strength of the joint; the influence of the welding frequency on the welding deformation of the stainless steel plate is closely related to the thickness of the steel plate, etc. For example, for the 0.5mm stainless steel plate, when the frequency reaches 2Hz, the overlap rate of the weld seam is high; when the frequency reaches 5Hz, the weld seam burns seriously, the heat affected zone is wide, and deformation occurs. It can be seen that it is imperative to strengthen the effective control of welding deformation. 3. Effective countermeasures to avoid laser welding deformation In order to reduce the laser welding deformation problem and improve the welding quality of stainless steel plates, we can start by optimizing the welding process parameters. The specific operation methods are as follows: 1. Product and the introduction of the orthogonal experiment method The orthogonal experiment method is mainly Refers to a mathematical statistical method for analyzing and arranging multi-factor experiments through orthogonal tables. It is possible to obtain valid results with less experimentation and to infer good implementations. At the same time, it can also conduct in-depth analysis to obtain more relevant information and provide a basis for specific work. Generally, the welding current, pulse width and laser frequency are selected as the focus of investigation, and the welding deformation is regarded as an index, which is controlled to a small value, and the principle of reasonableness is adhered to, and the factor level is controlled within an appropriate range. For example, for a stainless steel plate with a thickness of 0.5mm, the current can be controlled between 80~96I/A; the frequency is between 2~5f/Hz, etc. 2. Selection of orthogonal table Usually, the number of test factor levels should be consistent with the number of levels in the orthogonal table, and the number of factors should be less than the number of columns in the orthogonal table. Reasonable design of the orthogonal table can be used for subsequent research work. Provide appropriate support and assistance.
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