Titanium tubes have high strength, good plasticity, toughness, and corrosion resistance, and are increasingly used in aerospace, shipbuilding, and chemical industries. To better utilize titanium tubes, it is necessary to master their weldability. The following elaborates on the welding process of titanium pipes, providing useful reference for future welding of titanium pipes.
01 Welding Materials
Welding wire: ERTi-2 Welding method: GTAW (manual tungsten inert gas welding)
Protective gas: Use argon gas with a purity of 99.995% and a water content of no more than 50Mg% m3 to protect the welding pool and areas with inner and outer surface temperatures above 400 ℃ in the welding joint.
02 Preparation before welding
(1) Groove processing
After cutting the titanium tube, use an alumina grinding machine to polish the groove, as shown in the following figure. The processed groove should not cause overheating or discoloration of the base material.
(2) Groove and welding wire cleaning
a, Clean the inner and outer surfaces within 50mm on both sides of the groove, and the cleaning procedure is as follows:
Polishing with a polishing machine → sanding with a sandpaper wheel → cleaning with acetone.
After cleaning, welding operations cannot be carried out directly. The operation can only be carried out after the groove end face is dried. If the placement time exceeds 2 hours, the groove must be cleaned again or protected with self-adhesive tape and plastic cloth.
b, The welding wire should also be wiped clean with a sponge dipped in acetone and stored in a dedicated welding wire box.
c, Operators must wear clean gloves during welding.
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