Introduction Of Precautions For Refinishing Titanium Pipes And Coils

General manufacturers refinishing welding titanium tube, titanium coiler environment can not have flowing air, other aspects of the same with the welding box in the refinishing. However, special attention should be paid to: 1, patch welding area can not be too large, patch welding process nitrogen flow should be larger, in the middle of the gas can not be stopped; 2, after the patch welding should not be too large.
2, after welding, should continue to pass the nitrogen protection, until the region until the cooling.
3, for some specific castings, such as complex thin-walled castings, in order to avoid the oxidation of the back of the filler weld area, the back of the argon gas can be blown until the casting is cooled; 4, the requirement of the filler weld operator with a high level of technical skills.
In order to obtain good quality titanium pipe castings, in the process of filler welding should pay attention to the following points.
1, make-up welding of the casting surface must be clean and dry, the casting in the welding box before loading is not allowed to touch directly by hand.
2, in the filler welding titanium tube, titanium coil process to prevent tungsten electrode and filler short circuit, resulting in tungsten electrode fracture, resulting in tungsten inclusions in the welded joints.

3, when the area and depth of the filler weld area is relatively large, should be divided into several times far layer welding, and to wait until the previous layer of welding layer are cooled before the next layer of welding, not allowed to weld once, so as to avoid deformation of the casting.
4, in the filler weld is almost over, should gradually reduce the current, narrow the melting zone. Therefore, it is recommended to use pulse current, so as not to accelerate the arc breakage, resulting in cracks.
5, after the end of filler welding should be allowed to cool the castings in the box for a period of time before opening the box to take out the castings, in order to avoid the rapid cooling of the castings weld zone cracks or deformation; the length of the cooling time depends on the wall thickness of the castings, usually in the 15-30mm.
6, welded titanium pipe, titanium coil castings after welding, should be promptly annealed or hot isostatic pressure, should not be left too long, usually not more than 5 days.
7, the number of patch welding can not be over the provisions of the relevant technical documents.