How to use UN-25KVA Butt Welder
1. When welding, the position of the electrode rod should be adjusted first, so that the electrode arms are kept parallel to each other when the electrode is just pressed to the weldment.
2. The number of current adjustment switch stages can be selected according to the thickness and material of the weldment. After the power is turned on, the power indicator should be on. The pressure of the electrode can be adjusted by adjusting the spring pressure nut and changing its compression degree.
3. After completing the above adjustments, you can turn on the cooling water before turning on the power to prepare for welding. The procedure of the welding process: the welding piece is placed between the two electrodes, and the foot pedal is depressed, and the upper electrode is brought into contact with the welding piece and pressurized. When the foot pedal is further depressed, the power contact switch is turned on, so the transformer starts to work. The circuit is energized to heat the weldment. When the pedal is released after welding for a certain period of time, the electrode rises. The power of the spring is used to cut off the power and then return to the original state. The single-point welding process is over.
4. Weldment preparation and assembly: Before welding the steel weldment, all dirt, oil, scale and rust must be removed. For hot-rolled steel, the weld must be pickled, sandblasted, or removed with an abrasive wheel. Although uncleaned weldments can be spot welded, the service life of the electrodes is severely reduced, while the production efficiency and quality of spot welding are reduced. Welding can be directly applied to medium and low carbon steel with thin coating.
Installation and maintenance of UN-25KVA butt welding machine
The welding machine must be properly grounded before use to ensure personal safety. Before using the welding machine, use a 500V megohmmeter to test that the insulation resistance between the high voltage side of the welding machine and the casing is not less than 2.5 megohms before applying power. Before maintenance, cut off the power before opening the box for inspection.
The welding machine is first supplied with water and then welded. It is strictly forbidden to work without water. The cooling water should be guaranteed to supply industrial water at 5--30 ℃ under the inlet pressure of 0.15--0.2MPa. After the welding machine is finished working in winter, compressed air should be used to blow the water out of the pipeline to avoid freezing the water pipe.
The lead of the welding machine should not be too thin or too long. The voltage drop during welding must not be greater than 5% of the initial voltage, and the initial voltage must not deviate from the power supply voltage by ± 10%.
Gloves, apron and protective glasses should be worn when the welding machine is operated, so as to avoid scalding from the sparks. The sliding part should be kept well lubricated and the metal splash should be removed after use.
After the new welding machine is used for 24 hours, the screws of each component should be tightened once. Pay particular attention to the connection screws between the copper soft coupler and the electrode. The oxidation between the electrode rod and the electrode arm must be removed after use. To ensure good contact.
If it is found that the AC contactor is not properly engaged when the welder is in use, it means that the voltage of the power grid is too low. The user should first solve the power supply problem. The wearing parts of this machine have moving contacts and static contacts of upper and lower electrodes