1. TIG arc length control technology;
2. The pipe wrench of the patented technology product developed to prevent the axial movement and radial movement of the pipeline during the rotation process is the key equipment for realizing TIG bottom welding;
3. Mature welding process is a necessary condition;
4. Cold worked grooves and special grooves are machined grooves;
5. The maximum amount of misalignment is less than or equal to 2 mm;
6. The gap control is 0-3mm, i.e. no gap pairs and no gap pairs.
