One-sided welding and double-sided forming operation technology is to use ordinary covered electrode, and through special operation methods, after the front of the groove is welded, it is guaranteed that both sides of the groove can be operated. The result is the same as fillet weld, so its symbol is the same as fillet weld.
Extended data
One-sided welding and double-sided forming operation technology
1. The arc striking shall be at the weld, which shall be "open" as soon as it is "led" and "accurate" as soon as it falls. Because the cable and the electrode holder have great torque on the wrist, it is not easy for the welder to hold the electrode holder stably. Therefore, when striking the arc, the welder should hold the electrode holder tightly and stroke his wrist slightly.
In addition, the welder's mood should be relaxed. If he is nervous, he will be stiff. If he is stiff, he will move mechanically and shake a lot, which will easily lead to "card" and "pull". In practice, starting from the friction method, the friction distance and the distance between the covered electrode tip and the working face are gradually shortened. Lightly falling and lifting, overcoming inertia, moderate speed, so that the trajectory of the electrode holder gradually reaches the approximate vertical effect.
2. What needs to be understood is that covered electrode moves in three aspects of space, and the speed of advancing to the molten pool should be consistent with the melting speed, so as to keep the arc length unchanged. The arc length is shortened or even "stuck"; Slow arc length and elongation increase spatter, reduce protection and affect droplet transfer.
The purpose of lateral movement is to stir the molten pool to increase the molten width, which should be fast in the middle and slow at both ends. It is closely related to the forward movement and varies greatly, depending on the shape of the molten pool and the amount of deposited metal. Only by organically combining the movements in three directions can we ensure a certain height and width of the weld and ensure high-quality weld quality.
3. Distinguishing molten slag from molten iron is the key to improve operation skills. Generally, the molten iron is in the front and the slag is in the back. Under the arc, the temperature of molten iron is high and the gloss is in the lower layer. However, the slag is low in temperature and dark in color, and swims on the molten iron. If the slag and molten iron can't be distinguished, the weld edge and fusion can't be seen clearly, and the welding blindness is great.
4. covered electrode should be replaced quickly and the joint should be accurate, because its quality will directly affect the quality of the weld. Fast, that is, when the end of the previous weld is still in a red-hot state, the arc is started immediately, which makes the front and rear welds easy to fuse and can effectively avoid defects such as porosity and slag inclusion. Accurate means that the joints are just right, the return distance is 10 ~ 20 mm, and the running time on the arc pit is slightly faster.
The return distance is too long, so it is difficult to find the exact location, but it is easy to overlap and separate. If the arc time is not well grasped, the joints will rise and fall. In addition, when the arc is closed, the arc pit should be round to avoid sharp shape, and the welding meat should be moderate, not too deep or too shallow to facilitate the joint.
5. Precise adjustment of current, especially vertical, horizontal and vertical welding, is very important for obtaining good internal welding quality and beautiful weld formation. Adjust the current to listen, see and compare, that is, listen to the sound of arc, see the state of arc combustion, and compare the shape of molten pool and the formation of weld.
Reference source: Baidu Encyclopedia-One-sided welding and double-sided molding operation technology
Reference source: Baidu Encyclopedia-Single-sided welding
Reference source: Baidu Encyclopedia-fillet weld