1. Power cord: divided into internal filling and external filling. External filling lines are available for bottom and high current filling. The end of the wire is located at the front of the ramp and is fixed with the left hand, and it is fed into the weld pool for welding. There is almost no gap between males. Its strengths include high current, small aperture, high productivity and easy-to-control operating skills. The disadvantage is that if it is used at the bottom level, the driver will not be able to see the blunt edge of the fusion and the discord is too high, and it is very easy to have a fusion defect and cannot realize the ambition of discord. Internal fill lines can only be used for basic welding. Feed the silk with your left thumb, index or middle finger. Tighten the little and ring fingers to guide the direction of the wire. The wire is close to the blunt edge of the slope and the weld is melted on the blunt edge. The space between the grooves is larger than the diameter of the wire, and the plate is able to bend into an arc. Its advantage is that when the wire is tilted, the blunt edge and melting of the wire can be clearly seen, and the remaining height in front of it can be seen with residual eyes. As a result, the weld melts excellently and the remaining height and seamless height on the opposite side are well controlled. The flaw is that it is difficult to use, and welders need professional operating skills. Due to the large void, the welding volume is added accordingly, resulting in large voids, low current, and low work efficiency compared to external wire filling.
2. The welding handle is divided into crank and mop. Gently press the welding nozzle into the weld with the handle and swing the welding arm for welding. The advantage is that the welding nozzle is pressed into the weld and the welding handle is very stable during operation. Therefore, the weld is well protected, with good quality, beautiful appearance and high product qualification rate. Especially welding, it is very convenient. When welding stainless steel, excellent exterior color can be obtained. Defects are difficult to learn because the hands will tremble violently and will not be able to weld to the obstructed area. A mop is a welding nozzle that is placed gently or gently on a weld like a little finger or right hand on a workpiece. Gently roll your hand and pull the torch for welding. Its strength is that it is easy to learn and get used to, but the drawback is that it is not as good as the handle in planning and quality, especially in step welding, and is not suitable for welding. When welding stainless steel, it is difficult to get the color and shape of the ambition.
3. Arc extinguishing: Arc extinguishing equipment (high-frequency oscillator or high-frequency pulse generator) is generally used, and the tungsten electrode does not contact with the welded parts to ignite the arc. Starter without lever (primarily used in field installations, especially height installations). Copper or graphite arc incineration can be used for groove welding, but this method is very cumbersome and rarely used. Typically, welding wire is used for small scratches that result in a direct short circuit between the welded part and the tungsten electrode, quick cut-off, and arc protection.
4. Welding: After arc welding, it is necessary to preheat the welded part for 3-5 seconds to form a molten pool and feed wire. When welding, the point of view of the welding gun should be appropriate, and the wire feeding should be uniform. The welding method should move smoothly, swinging slowly from one side to the other, quickly in the center. Pay special attention to the alteration of the bathtub. As the weld pool increases, the weld swells or sinks, and then the welding speed is increased or the welding current is readjusted. If the molten pool does not melt well and the wire does not felt, it is necessary to reduce the welding speed or add the welding current. If the weld is low, be aware of the blunt edges on both sides of the slope, excess light on the other side of the weld, and other changes in height.
5. Closing the arc: When the arc is closed directly, it is very simple to shorten the cavity. The arc of the torch fitted with an arc initiator is aborted at regular intervals or placed in the appropriate arc abort current, and the arc is slowly aborted. If there is no arc, the arc will move slowly to the other side of the groove without shortening. In case of shortening, it is necessary to polish it before welding. If the arc stops at the joint, it is necessary to first polish the joint into an inclined groove. When the connection is completely melted, weld 10-20mm forward and abort the arc slowly to avoid shortening. In production, it is often possible to see that the joint is not polished in the inclined groove, which directly prolongs the welding moment of the joint. This is a very bad habit that can easily lead to protruding, seamless and reverse separation of joints, which then affects the beauty of the molding process. If it's a high-alloy material, it's easy to crack. After welding, the appearance looks useful, and when leaving it is necessary to turn off the power and air.
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