Fully automatic melting argon-rich mixed gas shielded welding single-sided welding and double-sided forming bottoming method

Abstract

The present invention provides a fully automatic melting extremely rich argon mixed gas shielded welding method for single-sided welding and double-sided forming bottoming method. The burn-through caused by welding double-sided forming process is carried out by means of metal gas shielded welding welding robot. While using the left welding method to avoid the excessive size of the molten pool and buffer the direct impact of the plasma flow force and the high-speed droplet on the bottom of the gap , and then through the swing to reduce the probability of the spray transfer droplet hitting the center of the root gap at high speed; depending on the thickness of the blunt edge, it can stay at the blunt edge. The invention maintains the balance effect of the surface tension of the molten pool on the gravity of the molten pool and the impact force of the high-speed molten droplet on the molten pool by reducing and dispersing the plasma flow force of the arc, optimizing the impact position and direction of the high-speed molten droplet on the molten pool, and preventing burn through.

Description

technical field [0001] The invention relates to a fully automatic melting argon-rich mixed gas shielded welding single-sided welding and double-sided forming bottoming technology. Background technique [0002] The single-side welding and double-side forming bottoming process is the first process of thick plate welding, and it is also the most difficult process. The difficulty lies in preventing incomplete penetration and preventing burn-through. For manual, short-circuit transition welding methods (such as semi-automatic CO 2 Gas shielded welding and electrode arc welding), it is relatively easy to achieve single-sided welding and double-sided forming. This is because: on the one hand, because in the short-circuit stage, the arc force and thermal effect are weakened, the volume of the molten pool will not increase but tends to cool down, and at the same time the strong arc plasma flow force disappears, and the strong impact of the molten drop also disappears. Therefore, t...

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Problems solved by technology

[0010] The measures to eliminate the two defects of incomplete penetration and burn-through are diametrically opposed, and the elimination of burn-through defects requires more stringent conditions (to make the root gap tend to a stable value), and to make the root gap tend to a stable value in actual welding Due to the dispersion of blanking and groove processing in the process, it is difficult to achieve

Therefore, the key to fully automatic MAG rooting welding is that the root gap can be eliminated within a certain range (up and down 0.2mm) to ensure the elimination of burn-through defects. Usually, it is mainly from the perspective of heat (that is, reducing the current and controlling the volume of the molten pool) to avoid burning. However, as mentioned above, this idea is very difficult to solve the burn-through of the bottom pass of automatic MAG welding

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