The effect of exposed length of wire, current intensity and the rate of resurfacing on the process of arc overlaying with self-shielded wire

A common characteristic by all of the padding processes in which filler metals are provided by flux cored shielded (GMA), self-shielded (SSA) wires or hidden arc, is the possibility of improving the overlaying efficiency not only by increasing the intensity of the current, but also by keeping it con...

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Bibliographic Details
Published in:Welding International 2006-02, Vol.20 (2), p.89-94
Main Authors: Klimpel, A, Sawicki, G, Klimpel, S T
Format: Article
Language:English
Subjects:
Applied sciences
Effects
Efficiency
Exact sciences and technology
Hardness testing
Joining, thermal cutting: metallurgical aspects
Metals. Metallurgy
Welding
Wire
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Summary:A common characteristic by all of the padding processes in which filler metals are provided by flux cored shielded (GMA), self-shielded (SSA) wires or hidden arc, is the possibility of improving the overlaying efficiency not only by increasing the intensity of the current, but also by keeping it constant together with the rate of welding while extending the intensity of the current, but also by keeping it constant together with the rate of welding while extending the exposed length of wire. A length of the wire extended outside the power terminal by more than usual - depending on diameter - 25 to 40 mm, is, prior to being melted by the arc's heat, resistance-heated to between 1000 and 1500 °C. This high wire preheating temperature distinctly increases its melting rate (overlaying efficiency) while also reducing the contribution of the base metal to the material of the overlay.
ISSN:0950-7116
1754-2138
DOI:10.1533/wint.2006.3535