1, the external filler wire can be used for priming and filling, and its current is high. Its welding wire head is on the front of the groove, and the welding wire is held by the left hand and continuously fed into the molten pool for welding, and the groove gap is required to be small or no gap.
2. Filled welding wire can only be used in backing weld. Feed with the thumb, forefinger or middle finger of the left hand. The little finger and the ring finger clamp the welding wire to control the direction, and the blunt edge of the welding wire near the groove is integrated with the blunt edge for welding. The groove gap is required to be greater than the diameter of the welding wire. If it is a plate, the welding wire can be bent into an arc.
3. Arc striking device (high-frequency oscillator or high-frequency pulse generator) is generally used for arc striking. When there is no arc ignition device, contact arc ignition is used (mostly used for on-site installation, especially for high-altitude installation). Copper or graphite can be placed on the groove of the weldment to start the arc. However, this method is more troublesome and rarely used. Generally, when the welding wire is lightly scratched, the weldment is directly short-circuited with the tungsten electrode, which is quickly disconnected and ignites the arc.
Property analysis
Argon arc is an operation in which both hands move at the same time, which is the same as drawing a circle with the left hand and a square with the right hand in our daily life. Therefore, it is suggested that people who have just started to learn argon arc welding should be trained in a similar way, which is helpful for learning argon arc welding.
When the fusion of molten pool is not good and the wire feeding feels motionless, it is necessary to reduce the welding speed or increase the welding current. If it is backing weld, the attention should be focused on the two blunt edges of the groove, and the corner of the eye is opposite to the weld. Pay attention to other height changes.