Laser welding in the application of stainless steel occupies very uns s32750 sheet important position, especially in the auto industry, body all adopt welding mode connection. However, influenced by many factors, stainless steel plate welding deformation problems. And control difficult. Not conducive to the sustainable development in related field. Therefore, to strengthen the research of laser welding of stainless steel plate deformation is of great significance.
1. Description of laser welding
Laser welding is mainly refers to the use of laser melting and connecting the workpiece can be used as heat source of a welding method. In the process of laser welding, laser irradiation to the surface of welding material, and its effect, and part is reflected. The rest is absorbed, enter the material, the welding. In short, the process of laser welding is used by the optical system of high power laser beam after focusing, exposure to the surface of welding material, and then make full use of the materials of light energy absorption for heating treatment yuen behind after cooling form a melt welding process of welded joint. Typically, deep penetration laser welding is mainly divided into heat conduction welding and two categories.
2. The welding deformation of harm and the main factors influencing the welding deformation
The main factors influencing the welding deformation of welding current. Pulse width and frequency. The welding current is added, the weld width also will increase, gradually appear the phenomenon such as splash, lead to deformation of weld surface oxidation, accompanied by rough feeling; Pulse width increases, increase strength of welded joint, when the pulse width to a certain extent, the material on the surface of the heat transfer x56 line pipe energy consumption also will increase, make the liquid evaporation from the molten pool spatter, lead to solder joint sectional area is smaller, affect the joint strength; Welding frequency to the influence of the stainless steel plate welding deformation is closely related to the thickness of the steel plate, etc, such as for 0.5 mm stainless steel plate, when the frequency reaches 2 hz, weld overlap rate is higher; And when the frequency reaches 5 hz, weld burning is serious, with wider range of heat affected zone, deformation. Thus, it is imperative to strengthen the effective control of welding deformation.
3. Some effective measures to avoid laser welding deformation
In order to reduce the laser welding deformation problems, and improve the welding quality of stainless steel plate, can from the welding process parameters were optimized, specific operation method is as follows:
1. The product and the introduction of the orthogonal experiment method
Orthogonal experimental method is mainly refers to a 321 stainless steel sheet schedule by orthogonal table analysis and multi-factor test method of mathematical statistics. Able to take advantage of less test to obtain effective results, and deduce the very good implementation plan. , the thorough analysis at the same time, also can to obtain more information, provide the basis for the specific work. Generally choose the welding current, pulse width and focuses on objects, such as laser frequency will welding deformation as the indexes, to control it in a small value, and adhere to the principle of reasonable, control factor levels in the appropriate range. As for the thickness of 0.5 mm stainless steel plate, current can be controlled between 80 ~ 96 I/A. Frequency of 2 ~ 5 f/Hz, etc.
2. The choice of orthogonal table
Normally, test factors level number should be consistent with the horizontal orthogonal table, number of factors should be less than the number of columns in the orthogonal table, the reasonable design of orthogonal table can provide support and assistance for subsequent research.