DAIKOWT Ti 7

GTAW
  • TITANIUM ALLOYS
Gr. 7

Description

Titanium Alloy Rod gr. 7
A rod that offers the same mechanical properties as grade 2 titanium, but with the addition of 0.12% palladium, which improves corrosion resistance in mildly reducing conditions or when crevice and under-deposit corrosion is possible. ERTi-7 is used for welding grade 2 or 16 titanium where specific anticorrosive properties are needed. The deposit is ductile, ensuring excellent corrosion resistance in oxidizing environments and represents a versatile solution for many industrial applications where a reliable material against complex corrosive phenomena is required.
Specifications
AWS A5.16
ERTi-7
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
51
A-No (QW442)
-
Chem. Comp. %
DEFAULT
C
0.02
N
0.009
P
0.006
S
0.2
Fe
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
420
Yield strength Rp0.2 MPa
0
280
Elongation A (L0=5d0) %
0
20
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
3.2 mm
Ampere
190A - 250A
220A - 280A
Voltage
-
-
Packaging
Ø 1,0÷2,4 mm
Ø 1,0÷2,4 mm
Packaging Type
5kg carton tube
5kg carton tube
Description

Application

The DAIKOW Ti 7 offers the same mechanical properties as the DAIKOW Ti 2, with significantly improved corrosion resistance. It is particularly effective in applications requiring enhanced anticorrosion protection, such as welding grades 2 or 16. This result is achieved by adding palladium, which provides strong corrosion resistance and low density. With an alloy containing 0.12% palladium, the DAIKOW Ti 7 exhibits excellent performance against crevice corrosion or in situations of inconsistent deposits. It finds ideal use in industrial applications such as valves, heat exchangers, pipelines, and fittings, where reliability and durability are essential.

Alloy Type

Gr. 7 titanium.

Microstructure

Single-phase and near single-phase alpha alloys (compact hexagonal lattice-HCP).

Materials

Grade 7, Ti-0.15Pd and in some case for welding titanium base metal grades of 2, 16, and 26.
  • UNS: R52400

Welding & PWHT

Since titanium is a highly reactive metal, it is susceptible to embrittlement caused by oxygen, nitrogen, and hydrogen when exposed to high temperatures. To prevent atmospheric contamination, it's crucial to shield the metal with inert gases during welding. During the arc welding process, titanium must be protected from the surrounding atmosphere until the temperature drops below about 430 °C. It is essential that titanium is free of heavy oxides and properly chemically cleaned before welding, as impurities such as oxides, water, grease, or dirt can cause embrittlement. Consequently, titanium welding rods must be chemically clean and free from heavy oxides, absorbed moisture, grease, and dirt. Cleaning between passes is not required if the weld bead remains shiny and silver. Any discoloration of the weld towards yellowish or bluish hues can be removed with a clean stainless steel wire brush. Contaminated weld beads, identified by dark blue, gray, or white hues, must be completely removed by grinding. Subsequently, the joint must be re-prepared and thoroughly cleaned before repeating the welding.

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