Precautions for welding screw application

1.the power supply adopts the vertical external characteristic, and the positive polarity is used in the direct current (the welding wire is connected to the negative electrode).

2.it is generally suitable for the welding of thin plates below 6mm, with the characteristics of beautiful weld bead and small amount of welding deformation.

3.the maintenance gas is argon, and the purity is 99.99%. When the welding current is 50-150A, the argon flow rate is 8-10L/min, and when the current is 150-250A, the argon flow rate is 12-15L/min.

4.the length of the tungsten pole protruding from the gas nozzle is preferably 4-5mm, and is 2-3mm in the center of poor coverage such as fillet welding, 5-6mm in the center of the deep groove, and the nozzle to work interval is not normal. Beyond 15mm.

5. In order to avoid the appearance of welding vents, the welding parts must be cleaned and cleaned, such as rust and oil.

6. the length of the welding arc, when welding ordinary steel, 2~4mm is better, and when welding stainless steel, it is better to use 1~3mm. If it is too long, the maintenance effect is not good.

7. In order to make the argon gas maintain the welding pool well and facilitate the welding operation, the tungsten center line and the welding workpiece should generally adhere to the angle of 80-85°, and the angle between the filler wire and the workpiece surface should be as small as possible. Ordinary is about 10 °.

8. In order to make the argon gas maintain the welding pool well and facilitate the welding operation, the tungsten center line and the welding part should generally adhere to the angle of 80-85°, and the angle between the filler wire and the workpiece surface should be as small as possible. Ordinary is about 10 °.

9.wind and ventilation. In the windy center, take measures to block the net, and indoors should take appropriate ventilation measures.