PSI - Issue 30

Pavel Zhilin et al. / Procedia Structural Integrity 30 (2020) 209–215

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Pavel Zhilin et al. / StructuralIntegrity Procedia 00 (2020) 000–000

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1. Introduction Investigations of the use of auxiliary cold and hot wires have been carried out by Saenger (1971), Saenger (1970), Van Dyke and Wittstock (1972), Konischev et al. (1987), Konischev and Zhilin (1988), Konischev et al. (2015), Zhilin and Gerasimov (2019) in relation to various welding and cladding methods (Figure 1). Laser and electron beams, plasma, submerged, gas tungsten and metal arcs, as well as electroslag and oxyfuel gas have been used as a heat source. As a result, the general patterns of the wire heating by current passing in accordance with the Joule-Lenz law have been revealed, including with an increased electrode extension. In addition, some methodologies have been developed for calculating the heating modes of the auxiliary filler wires (AFW) of various diameters and chemical compositions. Also, requirements have been determined for power sources and separate heating units that can be built into different welding and cladding machines.

Fig. 1. Fusion welding and cladding methods with auxiliary cold and hot wires.

Nomenclature Q

heat input arc voltage

U a

U hw

hot wire voltage

I a

arc current

I hw

hot wire current

the penetration profile coefficient the reinforcement profile coefficient

 pen  rein

Р c Р h H C

the ratio of cold wire the ratio of hot wire penetration depth weld bead height weld bead width

В wbw

the ratio of the base and filling metals

 0

F c.c-s.a. cladding cross-sectional area F p.c-s.a. penetration cross-sectional area F w.b.s-c.a. weld bead cross-sectional area