According to the design and construction documents and welding procedure requirements, A242 Type1 weathering steel plate shall be used for joint welding of A242 Type1 weathering steel plate components. The purpose of the socket is to fix the welded joint and adjust parameters such as the dislocation of A242 Type1 weathering steel plate.
The use of the internal alignment device shall be completed after the completion of the root pass to avoid stress caused by excessive displacement or stress of the A242 Type1 weathering steel plate on the finished weld.
Before the external aligning device is emptied, the accumulated length of the root pass shall not be less than 50% of the pipe perimeter and the root pass shall be evenly distributed around the nozzle perimeter.
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