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Automatic welding systems enable various degrees of automation of the girth welding process. The method combines well with others, such as manual and semi–automatic welding.

The essential steps and equipment components required of automatic welding system:

1. The first and most important factor in providing for stable weld joint quality during automatic welding is proper pipe end preparation, like pipe facing machine

2. The second factor is to perform the root weld pass using one of the technologies

• internal, using an internal welding machine
• external, using an internal line–up clamp with built–in copper shoes;

3. The next step is the use of external welding bug to perform the filling pass and capping pass

The advantages of automatic welding are obvious especially in fairly large projects with distances of 50 km or more to weld and with pipeline diameters of 22" (558mm) or more.

After development of decades, Luoyang Deping Technology Co,. Ltd has designed and produced the automatic welding equipments by ourselves, which combined with kinds of patents and well used in the SIOPEC project in Tianjin LNG project and Russia Sino II Pipeline