SU560721A1 - The composition of the welding wire - Google Patents

Description

The invention relates to welding materials, is intended for welding titanium alloys, and can be used as an electrode and filler material in all industries.

A known titanium-based welding gun 1, containing the following components, wt%:

Aluminum1.5-5

Zirconium, 1-2 Tin2-3

Tungsten 0.5-1

Copper 0.2-1

Molybdenum 1.5-2.5

 and the rest.

Also known is the welding rod 2, containing the following components, wt.%:

to 10 to 10 to 10 to 5 to 5 to 5 Else.

Used {as wire filler material: of known compositions does not provide the required weld-strength indicators for welding titanium alloys of medium and high strength after high thermal or two-stage annealing, as well as after quenching and staresh.

In order to increase the strength and plasticity of welded joints, in particular, after high-temperature annealing, the composition additionally contains copper and hafnium, with the following ratio of components, wt.% :.

Alimirshy3-5

Molybdenum2,6-4

Zirconia2.6-5

Tin 0.5-3

Vanadium 3-5

Niobium 3.5-5

Copper 0.1-0.5

5-4

 Itai rest.

Hafnium in the double system with titanium has little effect on the mechanical properties of the alloys, odgako, with complex alloying found

its positive effect: some increase in strength without reducing ductile ™.

Niobium has an analogous effect, however, its effect on strength is more significant.

It is known that in order to effectively influence the amount of zirconium in the weld metal should be 1.6-2.5 wt.%. Taking into account that the fraction of the filler metal in the formation of the weld was ffi 30–70 wt.%, 2.6–5 wt.% Zirconium was added to the filler metal.

In order to increase the strength and transfer the alloy into the two-phase region, the " stabilizer - aluminum is introduced into all the two-phase titanium alloys.

The proposed welding wire is intended for welding a large number of alloys. Copper is introduced into some high-strength alloys as a alloying element. Copper is an effective hardener in titanium alloys. For welding alloys of higher strength and for increasing the strength of welds in the case of using welded structures in a thermally hardened state, the composition of the proposed welding wire contains 0.1-0.5% copper (within the limits of solubility in a-titanium).

According to the results of the study of the effect of alloying elements on the properties of welds of titanium alloys, the optimal amounts of these alloying elements were determined.

Welding wire of the proposed composition was tested when welding high-strength titanium alloys.

When welding an alloy of grade VT22 No. C, the wire is used with the following composition, wt.%:

4.5

four

3

four

four

0.5

1.2

0.1

Rest.

When welding high-strength alloy systems use wire of the following composition, wt.%:

4.5.

four

3

four

four

1.5

2

P, 5

Rest.

Weld joints made using the proposed welding wire are distinguished by increased static finish when tested for re-stretching and bending.

Claims (2)

1. Copyright certificate № 440226, cl. 23 K 35/32, 1973 2. Patent of Germany N 1276333, cl. 40 to 15/00 of 1969