In order to obtain titanium tube castings with good welding quality, the following points should be noted during the welding process:

(1) The surface of the welded casting must be cleaned and dried, and it is not allowed to touch the casting directly with hands before it is loaded into the welding box.

(2) During the process of repairing titanium pipes, strict precautions should be taken to prevent short circuits between the tungsten electrode and the repaired welding piece, which may cause the tungsten electrode to break and result in tungsten inclusions in the welding point.

(3) When the area and depth of the repair welding area are relatively large, it should be welded in multiple distant layers, and the next layer of welding can only be carried out after the previous layer of welding has completely cooled down. It is not allowed to weld in one go to prevent deformation of the casting.

(4) At the end of the welding repair, the current should be gradually reduced to narrow the melting zone. Therefore, it is recommended to use pulsed current to prevent sudden arc interruption, which may cause cracks.

(5) After the welding repair is completed, the casting should be allowed to cool in the box for a period of time before opening the box and removing the casting to prevent cracking or deformation in the welding area caused by rapid cooling; The length of cooling time depends on the wall thickness of the casting, usually between 15-30mm.

(6) After welding repair of titanium tube castings, they should be annealed or hot isostatic pressed in a timely manner, and should not be left for too long, usually not exceeding 5 days.

(7) The number of welding repairs cannot exceed the regulations in the relevant technical documents.

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