Product Code: ICA10_1201

Welding of Titanium, Steel and Aluminum - Lithium Alloy by the Cw С2-Laser Beam
Authors:
Yury Afonin, S.A. Khristianovich Institute of Theoreical and Applied Mechanics SB RAS; Novosibirsk Russia
Anatoly Cherepanov, S.A. Khristianovich Institute of Theoreical and Applied Mechanics SB RAS; Novosibirsk Russia
Anatoly Orishich, S.A. Khristianovich Institute of Theoreical and Applied Mechanics SB RAS; Novosibirsk Russia
Presented at ICALEO 2010

A model describing the process of formation of a heterogeneous nucleus on nano-size particles which regards the linear tension on the boundary of three phases (nano-particle – nucleus – melt) is presented. The developed theory has been checked in the experiments at laser butt-welding of plates of titanium alloy (their thickness is 2 – 5 mm) the process involved nano-powder inoculars based on titanium nitride, yttrium oxide. CW CO2 laser with the beam power of 5 kW was used for the welding. Macro- and microstructure, micro-hardness were tested, as well as static and fatigue capacity. The experiments showed significant increase of the mechanical characteristics of the welded joint of titanium Т-20 and Т-5. Tensile strain increased 2 – 4.9 times, ultimate stress 1.23 – 1.35 times, yield stress 1.8 – 2.0 times, and fatigue capacity increases 2.0 times. The concentration of the modifying composition injected into the melt pool did not exceed 0.05 weight %. The obtained rupture strength (1050 MPa) and fatigue capacity are comparable to those values in the base metal.

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