COLD CRACKING AND LAMELLAR TEARING IN WELDED CARBON-MANGANESE STEELS

The increased size of ships in the last years has involved increased thicknesses and/or strength of hull material; also prefabrication procedures especially welding are being more and more extensively used. The obvious implication is that weldability in its broad sense becomes more difficult than it was in shipbuilding some years ago. Weldability is only examined here as regard to the aspect of cracking in or near welds. This report pertains strictly to steels, joint configurations, welding conditions typical for shipbuilding; but data and discussion, may find application in other structural applications. The main influencing factors of the topic are: (1) chemistry, strength and ductility of base metal; (2) hydrogen absorption in the welding pool; (3) joint configuration, restraint, assembling fit; (4) chemistry, strength and ductility of weld metal; and (5) homogeneity and properties in the thickness direction of the material. The study is not yet completed but the first results have permitted a clearer picture and to settle tentative guide lines. The study and research still in hand and, perhaps, much better the results of nondestructive examinations of the more representative joints in the actual production will say in future what relaxations are allowable or what restrictions necessary to the present provisions.

• Corporate Authors:

  Registro Italiano Navale

  20 Via Vente Settembre
  Genoa,   Italy 
• Authors:
  • Santini, W
  • Repetto, G
  • Pasini, G
• Publication Date: 1973-10

Media Info

• Features: References;
• Pagination: 34 p.
• Serial:
  • Issue Number: 53

Subject/Index Terms

• TRT Terms: Cold weather; Cracking; Embrittlement; Tearing; Welding
• Uncontrolled Terms: Cold cracking; Hydrogen embrittlement; Weldability
• Old TRIS Terms: Crack formation
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00053902
• Record Type: Publication
• Source Agency: Registro Italiano Navale
• Report/Paper Numbers: Tech Bull
• Files: TRIS
• Created Date: May 7 1974 12:00AM