Preparation before welding: the thickness less than 4mm need not be broken, and it can be directly welded, penetrating one side at a time. Butt welds with a thickness of 4 to 6 mm can be welded on both sides of the joint without breaking. More than 6 mm, generally open V-shaped or U, X-shaped groove.
Secondly, degreasing and derusting are carried out on the welding wire filled in the welding position. So as to ensure the welding quality.
Welding parameters: including welding current, tungsten electrode diameter, arc length, arc voltage, welding speed, shielding gas flow, nozzle diameter, etc.
1, welding current is the key factor to determine weld formation. It is usually determined by the material, thickness and groove shape of the weldment.
2. The electrode diameter is determined according to the welding current, and the larger the current, the larger the diameter.
3, welding arc and arc film, arc length range is about 0.5 ~ 3mm, the corresponding arc voltage is 8~ 10V.
4. Welding speed: Current, sensitivity of weldment material, welding position and operation mode should be considered when selecting.