Plidco SOLE+MATES Manual Del Usuario página 8

Weld material that meets or exceeds the tensile strength of the Sole+Mates or the pipe, whichever is
greater, must be used.
It is very important that the field welding procedure closely follow the essential variables of the qualified
procedure so that the quality of the field weld is represented by the mechanical tests performed for the
procedure qualification.
Welding Sequence
1. Weld the longitudinal joints first. It can assist in pulling the two halves of the sleeve tightly around
the pipe. Verify that the carbon steel backing strips are fully behind each longitudinal joint prior to
welding, tac-weld if necessary. Start the root and the next two subsequent filler passes at the
center and progress toward the end of the sleeves. Stringer beads are recommended. Stagger all
starts and stops.
2. For Type B sleeves, after the longitudinal weld seam is completely welded, weld the
circumferential ends to the pipe with fillet welds. The fillet weld size requirements are detailed in
Figure 10. Carefully control the size and shape of the circumferential fillet welds.
concave faced fillet weld, with streamlined blending into both members; avoid notches and
undercuts. The smoother and more streamlined the weld, the greater the resistance to fatigue
failure. The worst possible shape would be a heavy reinforced convex weld with an undercut.
Improper weld shape can lead to rapid fatigue failure, which can cause leakage, rupture or an
explosion.
Figure 10
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Strive for a
IP-022
Revision 1