Welding wire made of titanium gost VT20-1, VT20-2 alloys
|Alloy grade||Titanium gost VT20−2|
|Classification||Titanium deformable alloy|
|Industrial usage||Manufacture of welded wire|
Percentage composition according to GOST 27 265 — 87
|≤0.1||≤0.05||≤0,15||0.5 — 1.5||91.36 — 95.7||≤0,04||0.5 — 1.5||≤0,12||1 — 2||≤0,003||2 — 3||total 0,3|
Note: titanium is a basis; its percentage is noted in a table.
Mechanical characteristics (temperature is 20°С).
|Range of sizes||Size||F.e.||d5||sT||sv||KCU||y||Heat treatment.|
|Welded titanium wire gost VT20−1, GOST 27 265−87||12||590−785|
Physical characteristics of titanium gost VT20−1 alloy
|l||a 10 6||100||540|
|18.85||E 10- 5||T||r||R 10 9||C|
|Temperature at which are obtained actual characteristics:||20°С|
|Linear expansion coefficient α x 106 at 100 °C [1/ °С]||8.3|
|Density of alloy g/cm3;
|Module of elasticity 1 sort Е [MPa] x 10-5||1.12|
|Specific heat of alloy at 200 °C [J (kg-deg)]||0.587|
|Heat conduction coefficient, l [V/(m-deg)]||8|
|Specific electric resistance Оhm-mm2/m||1.1|
|Short resistance to rupture [MPa]||sv|
|Percent elongation at fracture [ % ]||d5|
|Impact hardness [ kJ/m2]||KCU|
|A flow limit at permanent change of form (proportional limit) [MPa]||sT|
|Brinell hardness [MPa]||HB|
|Contraction ratio (%)||y|
Titanium wire out-of-roundness can not outstep extreme deviation of diameter. Wire is made in outgassing or pickled conditions. Surface of welding wire should be light-toned, clean, without heat tints, non-pickled places, and dark spots. Small tears with dark non-pickling places on a surface are allowed. Surface may have small marks, tears, backfins of such depth that do not exceed values given in a table.
|Diameter of wire, mm||Depth of defect must constitute not more than (mm)|
Note: Sporadic defects of a depth up to 0.1 mm if a wire diameter is up to 3.0 mm are allowed.
General quantity of macrosection with defined exceeding of defect depth during a process of metallographic examination can not be higher than 10% of a whole macrosection inspection lot. Removal of surface contaminations and defects are made with a help of pickling treatment and peeling for wire degassing. Peeling of only sporadic local contaminations and pickling treatment of certain coils with a further repeated degassing are allowed as well.
Wire is delivered in coils which outer diameter must not exceed 900 mm. Coiled welding wire must not have waps sticking together; it must not have coil cambers up to 100°. Distortion that is caused by an annealing is not a rejection criterion. Coil weight can not be more than 50 kg along with a wire. If coil is composed of a few sections, length of each section must be at least 10 meters.
Mechanical characteristics of mill-products must fully comply with requirements specified in a table.
|Grade of titanium alloy||Ultimate resistance MPa (kgf\mm sq.)||Diameter, mm||Percentage extension b, % not more than|
|Titanium gost VT20−1||2.0 — 7.0||6.45−8.45 (6.0−8.0)||12.0|
Each coil has an attached label with following indications:
— alloy grade;
— name of manufacturer and trade mark;
— number of batch and smelt;
— release date;
— inspection stamp;
— marking of standard.
Each coil should be tightly bandaged with soft titanium wire in at least three places. Then, it must be packed in clean paper and wrapped with jute sack. Wrapping of coil is allowed by using synthetic mesh, or plastic film which thickness is 100 — 200 µm without paper pre-packaging according to GOST 10 354−82. Coil is tied with a binder made of synthetic and natural fibers according to normative-technical documentation.
|limitedly weldable||welding is possible at heating to 100−120°С and last heat treating|
|welding is done without further heat treating or heating|
|hardly weldable||in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, to do a heat treating (annealing) after welding|
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