Effect of Fabricating Process on Notch Toughness of Shipbuilding Steel Plates (Report II) : Superposition of Welding on Cold Work and Its Effect on Brittle Fracture Strength

概要

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Welded sections of grade E high-tensile and mild steel plates are used at the ship rounded gunwales to serve as brittle crack arresters. It is said that welding lifting eyes, etc., to the gunwale should be avoided because the gunwale plating, being initially cold-bent, will be adversely affected by the welding, to the detriment of its brittle fracture strength. The authors carried out brittle fracture initiation and propagation arrest tests on cold-worked-and-bead-welded grade E high-tensile and mild steel test specimens to determine how the cold-working and welding would combine together to affect the brittle fracture strength of the grade E gunwale plating. The tests indicated that: (1) welding on 3〜5% cold-worked grade E high-tensile and mild steel plates would exert no adverse effects on the brittle fracture strengths of the plates ; (2) welding lifting eyes to the rounded gunwales of grade E steels would suggest nothing alarming from a practical standpoint.
大阪大学の論文