Abstract
The paper analyzes the systems used for controlling molten wire metal droplets during the arc welding process in shielding gases. The variations for implementing the relevant systems are given, with the positive and negative aspects of such implementation taken into account. Electrical systems are currently investigated to the fullest extent possible and implemented in different power sources for pulsed welding arc. Mechanical systems are represented by different types of feeders that provide the pulsed wire feeding process. The feed mechanisms driven by electric motors and electromagnets are analyzed. In addition to the mechanical and electrical systems, the examples of combined control systems are given.
Highlights
Mechanized and automatic consumable electrode arc welding is the basic technology to have a permanent joint
The analysis of the systems described in this paper has proved that wire feeding units show a great potential for further development
Conclusion the wire metal transfer control process using various kinds of pulsed cycles is of great interest; this fact is evidenced by the development of modern welding technologies and machines, aiming at welds having specified properties
Summary
Mechanized and automatic consumable electrode arc welding is the basic technology to have a permanent joint. A number of features pertaining to the gas-shielded welding process depend on a type of electrode metal transfer. The transfer of wire electrode metal to a weld pool can normally be divided into three main stages. Within the second stage the droplet’s growth stops, and this droplet together with the electrode contact tip approaches to the weld pool. The third stage completes with the metal transfer to the pool when the bridge between the electrode tip and molten metal drop is destroyed. The types of metal transfer as well as forces acting on a wire electrode metal while arcing are described in [1, 2].
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