DAIKOWM Ti 7

Gr. 7 titanium.

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

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

• UNS: R52400

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.