It realized digital of nondestructive testing for spiral welded pipe.
Having been practiced for several years, a new butt method for spiral welded pipe, the two spots tack-weld butt was made out.
In the production of H. F. butt spiral welded pipe, the vertical roll extruding installation with fixed position are changed into horizontal roll installation with fixed pressure.
High-quality spiral welded pipe can not do without high-quality steel, quality carbon structural steel plate introduced starting with high-quality start.
