Hebei Huayang Steel Pipe Co., Ltd. |
|
API 5L X52 Saw Steel Pipe pipeline use for oil transmission
1. Basic requirements for the appearance of lsaw welds
Before the non-destructive testing of lsaw steel pipes, the
inspection of the weld appearance shall meet the requirements. The
general requirements for the appearance of lsaw welds and the
surface quality of welded joints are as follows: the appearance of
the weld should be well formed, and the width should be 2 mm per
side over the edge of the groove. The height of the fillet of the
fillet weld shall comply with the design regulations and the shape
shall be smooth transition. The surface of the welded joint should
be:
(1) Cracks, unfused, pores, slag inclusions, and splashes are not
allowed.
(2) Pipes, stainless steels and alloy steel pipe weld surfaces with
a design temperature lower than -29 degrees shall not have
undercuts. Other material pipe weld seam undercut depth should be
greater than 0.5mm, continuous undercut length should be no more
than 100mm, and the total length of the undercut on both sides of
the weld is not more than 10% of the total length of the weld.
(3) The surface of the weld shall not be lower than the surface of
the pipe. The weld bead height is not more than 3mm (the maximum
width of the welded joint group to the rear bevel).
(4) The wrong side of the welded joint shall not exceed 10% of the
wall thickness and shall not exceed 2 mm.