Titanium tube has higher strength, good plasticity, toughness and corrosion resistance. It has been widely used in aerospace, shipbuilding and chemical industry. In order to make better use of titanium tube, it is necessary to master its weldability. This paper mainly expounds the welding process of titanium tube, which provides a useful reference for the welding of titanium tube.
1. Welding material:
Welding wire: ERTi – 2; Welding method: GTAW (manual tungsten arc welding); Protection gas: use purity of 99.995%, water content should not be greater than 50Mg%m3 argon, welding pool and welding joint internal and external surface temperature above 400 degrees Celsius area are argon shielded.
2. Preparation before welding:
A: Groove machining
After the titanium tube is cut, the groove is polished with an alumina sand grinder, and the groove is not allowed to overheat and discolor the base material.
B: Groove and wire cleaning
The inner and outer surfaces of the bevel and its sides are cleaned inside 50mm, and the cleaning procedure is as follows:
Sander, sandpaper polishing wheel, acetone cleaning.
After cleaning, the welding operation can not be carried out directly, and the end face of the groove can be dried before it can be operated. If placed more than 2 hours, you must clean it again, or use self-adhesive tape and plastic sheeting to protect the groove.
The welding wire is also cleaned with acetone sponge and stored in a special wire box.
The operator must wear clean gloves during welding.