DAIKOWT 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.

Titanium, being reactive, is susceptible to embrittlement by oxygen, nitrogen, and hydrogen, particularly at higher temperatures. Shielding the metal from atmospheric contamination during welding, using inert gas, is crucial. This shielding must be maintained until the titanium cools below approximately 430°C post-arc welding. To ensure optimal welding, the titanium must be free of thick oxide and undergo thorough chemical cleaning before initiating the welding process. Contamination from oxide, water, grease, or dirt can lead to embrittlement. Therefore, it's essential to ensure that titanium welding rods are both chemically clean and free from heavy oxide, absorbed moisture, grease, and dirt. If the weld bead retains a bright, silvery appearance, cleaning between passes is generally unnecessary. However, discoloration like straw or light blue can be effectively removed by wire brushing with a clean stainless steel wire brush. Conversely, weld beads showing signs of contamination, such as dark blue, gray, or white powdery discoloration, require thorough removal through grinding. After removing contaminated weld beads, meticulous joint preparation and cleaning are essential before proceeding with subsequent welding operations.