The technology of 0 1 secondary welding can be summarized as four points: steady hands, fine breathing, rhythmic swinging and eyes that can read the molten pool. The invention has the advantages of high welding productivity, good crack resistance, small welding deformation and large adaptive deformation range, and can be used for welding thin and medium plate parts. What are the key technologies? Refining? 、? Enlightenment? 、? Is it steady? .

Double-sided shielded welding (full name carbon dioxide gas shielded welding) process is suitable for welding various large steel structures of low carbon steel and low alloy high strength steel. High welding productivity, good crack resistance, small welding deformation and wide deformation range, which can be used to weld thin and medium plates. What is the key of the second welding technology? Refining? 、? Enlightenment? 、? Is it steady? . The technical judgment can be summarized as four points: steady hands, thin breathing, rhythmic swinging and being able to read the eyes of the molten pool.

1, first of all, the hand should be steady: that is, the hand should have strength, control the welding torch well, and hit wherever you want (there is no shortcut, only hard training).

2. Breathe carefully: when breathing, the chest will expand and contract, driving the arm to move, which will be unstable when welding. Practice breathing, keep your fingers in a certain position, breathe carefully, keep your hands still or walk straight with your will to find the feeling of breathing (the key is enlightenment).

3. The swing should have a sense of rhythm. When swinging, stay at the folding point for 0.5 seconds, and the straight line segment should be fast (the principle of fast is that as long as the arc combustion is stable and can't leave the molten pool, it can swing as fast as possible). When you exercise your sense of rhythm, you can shout slogans at12-12-12-and control the rhythm according to the slogans.

4. Eyes should be able to read the molten pool: control the position of arc and molten pool. The key of operation is to control the shape and size of molten pool during welding.

The operation points are as follows:

1, joints with grooves in vertical or inclined positions must be welded from bottom to top, and downward welding can be used for thin plate butt welding and vertical fillet welding without grooves; Horizontal, horizontal and vertical butt joints can be welded to the left.

2. For outdoor operation, when the wind speed is greater than 1m/s, windproof measures should be taken.

3, must according to the structure of the weldment, choose a reasonable welding sequence.

4. Both ends of the butt joint shall be provided with arc striking plates and arc extinguishing plates with appropriate sizes.

5, should always clean up the dirt in the hose and nozzle splash.

6. For plate joints with grooves, especially thick plate multi-pass welding, the welding wire should stay on both sides of the groove for a short time when swinging, and the thickness of each layer of sawtooth strip should not be greater than 4mm, so as to make the weld fusion good.

7, according to the diameter of the welding wire, choose the welding wire contact nozzle correctly, and the length of the welding wire should generally be controlled within 10 times of the welding wire diameter.

8. When welding the wire feeding hose, it must be pulled smoothly and cannot be bent. The radius of the wire feeding hose shall not be less than150mm .. Before welding, the residual impure gas in the gas supply hose shall be discharged.

9. After the contact nozzle is worn, the aperture increases, which leads to unstable welding, so it is necessary to replace the contact nozzle.