For the large diameter SSAW steel pipe, flame cutting is not allowed in a groove in principle, then with Angle grinding machine, it will have negative thermal effect of the pipes, but for the on-site construction units without groove machine, with a ring flame cutting machine cutting 45 degrees and reoccupy grinder repair grinding phenomenon is very common.
Normally we will choose a u-shaped groove or complex groove, because the u-shaped groove, composite groove machining time, draining pipe welding power. V groove machining is brief, time saving, energy saving, but large diameter and thick wall pipe V groove all active during welding, such as welding technology parameter choosing wrong, will cause the welding faults occur.
Normally we will choose a u-shaped groove or complex groove, because the u-shaped groove, composite groove machining time, draining pipe welding power. V groove machining is brief, time saving, energy saving, but large diameter and thick wall pipe V groove all active during welding, such as welding technology parameter choosing wrong, will cause the welding faults occur.
With welded steel pipe for pipeline building strength grade progress to X70 and X80 grade, and the pipe diameter and wall thickness increasing, since 2003 in the pipeline construction start using active solder skill step by step. Pipeline active welding skills due to the high welding power, small labor intensity, small influence of the welding process affected by man-made factors and other advantage, has great potential in the use of large diameter and thick wall SSAW steel pipe.
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