First, the principle of argon arc welding
TIG welding is a method of using argon as a protective gas a welding technique. Also known as argon gas shielded welding. It is to pass argon protective gas around the arc welding to isolate the air outside the welding area and prevent the oxidation of the welding area. Since argon gas is continuously supplied in high temperature fusion welding, the welding material cannot be contacted with oxygen in the air, thereby preventing the oxidation of the welding material, so stainless steel and iron metal metals can be welded.
2. Classification of argon arc welding
1. Non-melting electrode argon arc welding
Non-melting electrode argon arc welding is where the arc burns between the non-melting electrode (usually tungsten electrode) and the workpiece, and flows around the welding arc through a chemical that does not react with the metal. Inert gas (commonly used argon gas) forms a protective gas cover, so that the tungsten tip, the arc and the molten pool and the metal that has been at a high temperature are not in contact with the air, which can prevent oxidation and absorb harmful gases. The result is a dense welded joint with very good mechanical properties.
2. Melting electrode argon arc welding
The welding wire is fed through the wire wheel, the contact tip conducts electricity, and an arc is generated between the base metal and the welding wire, so that the The welding wire and base metal are melted, and the arc and molten metal are shielded with inert gas argon for welding. The difference between it and argon tungsten arc welding: one is that the welding wire is used as an electrode, and it is continuously melted and filled into the molten pool, and the weld is formed after condensation; The gas has been developed from a single argon gas to a wide range of mixed gases, such as Ar 80%+CO 220% argon-rich protective gas. Usually the former is called MIG and the latter is called MAG. From the point of view of its operation mode, the most widely used are semi-automatic melting electrode argon arc welding and argon-rich mixed gas shielded welding, followed by automatic melting electrode argon arc welding.
Three. Mainstream TIG welding machine Model
WSE5 series AC/DC square wave argon arc welding machine;
WSE series AC and DC multi-purpose argon arc welding machine (moving iron core silicon rectifier assembly);
WS series IGBT inverter DC argon arc welding machine;
< p class="MsoNormal" style="margin-left:0pt;text-indent:21pt;background:#FFFFFF;"> WS-250IGBT inverter DC argon arc welding machine;
WS-315IGBT inverter DC argon arc welding machine;
WS-400IGBT inverter DC argon arc welding machine;
WS-500IGBT inverter DC argon arc welding machine;
WSM-160 Inverter Pulsed DC Tungsten Argon Arc Welder;
WSM-200 Inverter Pulse DC TIG Welding
WSM-250 Inverter pulsed DC TIG welding machine;
WSM-315 Inverter pulsed DC TIG welding machine;
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WSM-400 Inverter pulsed DC TIG welding machine;
WSM-500 Inverter Pulsed DC TIG Welding Machine.
4. Safety operation rules for argon arc welding machine
1. TIG welding must be operated by a special person.
2. Check the equipment and tools before work.
3. Check the welding power source, whether the control system has a ground wire, and lubricate the transmission part Oil. The rotation should be normal, and the argon gas and water source must be unblocked. If there is water leakage, please notify the repair immediately.
4. Check whether the welding torch is normal and whether the ground wire is reliable.
5. Check whether the high-frequency arc ignition system and welding system are normal, and the wires and cables Whether the joint is reliable, for automatic filament argon arc welding, it is also necessary to check whether the adjustment mechanism and the wire feeding mechanism are in good condition.
6. Select the polarity according to the material of the workpiece, connect the welding circuit, the general material Use DC positive connection, use reverse connection method or AC power supply for aluminum and aluminum alloys.
7. Check whether the welding groove is qualified, and there should be no oil stains or rust on the groove surface. Etc., oil and rust should be removed within 200mm on both sides of the weld.
8. For the reliability of the tire tool, the welding parts need to be checked for reliability. For preheating, check the preheating equipment and temperature measuring instruments.
9. The argon arc welding control button should not be far away from the arc, so that it can be Close anytime.
10. It is necessary to always check whether there is leakage when using high-frequency arc ignition.
11. If the equipment fails, the power should be cut off for maintenance, and the operator shall not repair it by himself.
12. It is not allowed to be naked or expose other parts of the Smoking and eating near the arc to avoid inhalation of ozone and smoke into the body.
13. Masks and gloves must be worn when grinding thorium tungsten electrodes, and the grinding machine must be operating procedures. It is best to use cerium tungsten electrodes (with less radiation). The grinder must be equipped with an air extraction device.
14. Operators should wear electrostatic dust masks at all times. Minimize the high frequency electric action time during operation. Continuous work shall not exceed 6 hours.
15. The argon arc welding workplace must be well ventilated. Ventilation and detoxification equipment should be activated during work. When the ventilation device fails, it should stop working.
16. Argon cylinders are not allowed to be smashed. There must be a stand for standing and keep away from Open fire more than 3 meters.
17. When argon arc welding is performed inside the container, a special mask should be worn to avoid Reduce inhalation of harmful fumes. Personnel should be set up outside the container to monitor and cooperate.
18. Thorium tungsten rods should be stored in lead When the rods are concentrated together, the radiation dose exceeds the safety regulations and causes injury.
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