Welding techniques
1. Clean the welding part: Before welding, remove the oil stains, rust and other dirt on the welding part to avoid welding pores.
2. Choose the appropriate welding current: Direct current should be used during welding, and the negative pole is connected to one end of the welding wire.
3. Control the argon flow rate: Use argon with a purity of 99.99% as the shielding gas. When the current is 50-150A, the argon flow rate should reach 8-10 liters/minute; when the current is 150-250A, the argon flow rate should reach 12-15 liters/minute.
4. Maintain the welding angle: When welding, the angle between the welding part and the center line of the tungsten electrode should be maintained between 80-85°, and the angle between the filler wire and the welding surface should be maintained within 10°.
5. Use positioning pins: When welding nuts, they must be completely placed in the positioning pins, and tilting is prohibited.
6. Control welding heat input: For thin plate welding, avoid excessive heat input to prevent welding deformation.
Operation steps
1. Preparation: clean the impurities on the welding part and the surface of the nut to ensure that the welding surface is clean.
2. Positioning the nut: place the nut accurately in the welding position and ensure that it fits the positioning pin completely.
3. Welding process: perform welding operations according to the above techniques, and pay attention to controlling the welding parameters and angles.
4. Cleaning spatter: After welding, clean the spatter and burrs on the welding part in time to ensure the welding quality.
Precautions
1. Keep ventilation: The working environment should be kept ventilated during welding, especially when welding indoors.
2. Use protective devices: A screen must be used during welding to prevent spatter from injuring people.
3. Check equipment regularly: Check welding equipment and tools regularly to ensure that they work properly.
4. Avoid contaminating the weld: Before welding, the metal Zn and Cd on the surface of the nut should be polished off with a file or other tools to prevent contamination of the weld.
5. Handle with care: For thin plate weldments that are easy to deform, they should be handled with care before and after welding to prevent deformation of the workpiece.
