Root Failure Resulting from Toe Treatment of Non-Load-Carrying Cruciform Fillet Welded Joints.

Fatigue performance of tubular X-joints with PJP+ welds: I — Experimental study

“…Their study shows that the fatigue life of welded joints increases with the radius of the weld-toe curvature. However, the fatigue life enhancement enabled by the weld toe treatment may postpone the toe cracking and cause potential root failures as observed in some experimental studies [26]. In general, root cracking is not a common failure mode in well-controlled laboratory tests for tubular joints, but an often observed failure in load carrying cruciform type joints [27][28][29][30].…”