Article
Medium frequency spot welding machine diagram
The common butt welding methods for aluminum alloys are spot welding and butt welding. 3457 series butt welding is easier and easier to use.Resistance AC butt welding machineThat’s it, the elements added in the 126 series are characterized by non-resistance welding.
For spot welding in touch welding, no matter which series it is, it is more difficult. The thicker the plate, the more difficult it is to weld. The reasons are: 1. The electrical conductivity and thermal conductivity are high but the resistivity is low. It is difficult to generate heat but dissipate heat quickly. It requires a high-power welding machine, which is 3-5 times greater than that of low carbon steel. 2. The plastic temperature range is small and the forging deformation is difficult. 3. The large heat-affected zone creates a wide area that is easy to soften. 4. An oxide film is easily formed on the surface to hinder the passage of current. 5. Poor stability, welding temperature and holding temperature cannot be guaranteed, making it difficult to form weld nuggets 6. Current shunts quickly and cracks are easily formed.
Therefore, the following points should be paid attention to when spot welding: 1. Use large current and short time, usually 32-45KA current and 0.1 second for spot welding. 2. There are many choices for aluminum alloy thin plates, including time-controlled and microcomputer-controlled spot welding machines that can accurately set time and current, such as hand-held spot welding machines, foot-operated spot welding machines and pneumatic spot welding machines; for thick plates, medium-frequency spot welding machines should be used. 3. Large-diameter flat or spherical electrodes made of dispersed copper should be selected. 4. The electrode should have good followability and the pressure should be 500-700KG. 5. The cooling water flow rate should be twice that of other materials. 6. The controller must have a slow-rising function to suppress splashing.
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