The invention 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. The following is the relevant information I have compiled. Let's have a look.

The technical decision of two-way welding can be summarized as four points: steady hands, fine breathing, rhythmic swinging and eyes can read the molten pool.

The specific method of uniform welding is:

1, first of all, the hand should be steady, that is, the hand should have strength, control the welding torch, and hit wherever you want.

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 posture, breathe carefully, control your hands or fingers in a straight line with your will, and find the feeling of breathing.

3. The swing should have a sense of rhythm. When swinging, the breaking point should stay for 0 or 5 seconds, and the straight line segment should be fast. When exercising the sense of rhythm, you can shout slogans at12-12-12-12-to control the rhythm according to the slogans; You can also sing a rhythmic song, control the swing rhythm according to the rhythm of the song, and you are not tired when you work.

4, eyes can read the molten pool, control the position of the arc and molten pool, the key is to control the shape and size of the molten pool in the welding process.

Secondary welding 1 operation points. Reasonable welding sequence must be selected according to the structure of the workpiece to be welded.

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

3. 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.

4. 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.

5. 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.

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

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

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

The current and voltage of the second welding can be adjusted by 1 The welding wire can be welded normally when it is dry and stretched, and the phenomenon of top wire appears for a long time, which shows that the welding voltage is low. At this time, we should reduce the current or increase the welding voltage by reducing the wire feeding speed.

2. The dropped metal ball always exists at the end of the welding wire, indicating that the welding voltage is on the high side. At this time, we should speed up the welding wire, increase the current or reduce the welding voltage;

When the current and voltage of the second welding do not match, two problems will occur. Of course, there are also problems such as big splash and bad sound. After the adjustment, these problems will be gone.