Control method of short circuiting transient process in consumable electrode gas shielded welding

Abstract

The invention provides a control method of a short circuiting transient process in consumable electrode gas shielded welding. The control method comprises that a conductance in a welding circuit in a short circuit stage of contact of molten drops and weld craters is fast and continuously detected; and in the short circuit later period that molten drop liquid necks become thin, an energized welding current of short circuit loads is correspondingly regulated and controlled according to changes of the electrical conductance, when short circuit finishes, the welding current is regulated and controlled to a preset background current, the welding current is correspondingly and continuously detected, regulated and controlled according to the conditions that the molten drop liquid necks are different to ensure that control effect is more accurate and more effective, and therefore the phenomena that in the short circuiting transient process in the consumable electrode gas shielded welding, the molten drops explode and splash or are frozen are effectively avoided.

Description

technical field [0001] The invention relates to the metal gas shielded welding technology, in particular to a method for controlling the short-circuit transition process in the metal gas shielded welding which can effectively reduce spatter. Background technique [0002] GMAW (Gas Metal Arc Welding) is the most widely used welding process, and short-circuit transition is one of the basic technical contents of this welding process. However, in the process of short-circuit transition, especially in carbon dioxide welding, it is often accompanied by the disadvantages of large spatter and poor forming. [0003] In order to solve the above problems, Lincoln Electric Company of the United States proposed a STT (Surface Tension Transfer, surface tension transfer) welding method. For details, please refer to the controlled short-circuit welding disclosed in Chinese Patent No. CN 1006450B announced on January 17, 1990. Systematic method and apparatus. This method of controlling the...

AI Technical Summary

Problems solved by technology

Process stability is severely compromised

And the recovery of this kind of damage often takes several cycles.

In addition, in actual production, because the welding current flows through a long wire and there are many ferromagnets around, there is a large reactance in the circuit, and the current cannot be switched off quickly.

And the production practice shows that it is very difficult, sometimes even impossible, to switch the high current before the end of the short circuit.

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