Measures to Prevent the SSAW Steel Pipe Heat Cracks

SSAW steel pipe welding process, the welding of many factors, must be dynamically welding curve in space, but also for forming and welding adjusted higher, if adjusted properly, to avoid heat cracks to ensure the quality of pipe welding .

1. Molding from the following aspects should be adjusted to control:
First, it must ensure that the molding process parameters to calculate accurately, issued properly adjusted accurately place; second, fine adjustment controls the amount of deformation of the steel strip forming bending sufficiently to minimize the difference in the curvature of the delivery side of the free edge; Third, correctly adjusted welding pad roller height, avoid engaging point of local stress occurs too large.

2. Control the welding factors:
(1) Can not be used in the welding position in the welding uphill, downhill welding are actually present, because the spiral submerged arc welded pipes, solder joints within itself, not the main deformation zone, if the use of welding uphill, this time tube deformation serious shortage within the weld most likely to tear.
(2) Within the joints should not be too far off center. Because too far off center, in the welding of mushroom-shaped, high saddle than shown. Such a shape is not conducive to weld puddle impurity discharge (slag crack inducement), stress and poor health.
(3) The amount of overlap in ensuring the premise, in the welding specification parameters should not be too large. For twin wire welding, the wire spacing should not be too large, too large or specification parameters spacing is too large, on the extension of the length of the bath. Pipe in advance process, will inevitably be affected by vibration and pushing, pulling, twisting and other forces of the bath increase, resulting in a slight chance of cracks increases.