PREVENTION OF HOT CRACKING OF BUTT WELDS IN STEEL PANELS BY CONTROLLED ADDITIONAL HEATING OF THE PANELS
A procedure is presented for controlled additional heating during and after welding in modern panel production lines prefabricating hull and bottom sections, the object being to prevent end cracking. The search for the optimal distribution and minimal amount of thermal energy needed for the additional heating is formulated as a mathematical programming problem. Two-sided irradiation is suggested as a feasible way of transmitting the thermal energy into the panel. A case for application in a Swedish panel production line is studied, and a formula for calculating the required additional heating is suggested. A preliminary study indicated that suitable controlled additional heating might possibly generate additional thermal stresses which might neutralise the existing crack-inducing thermal tensile stresses across the welded joint. The paper describes the systematic search for the distribution of additional heating over the plates of the panel such that the detrimental tensile stresses would be eliminated and at the same time the additional thermal energy supplied to the plates would be kept as small as possible.
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Corporate Authors:
Welding Institute
Abingdon Hall
Cambridge CB1 6AL, England -
Authors:
- AKESSON, B
- Karlsson, L
- Publication Date: 1976
Media Info
- Features: References;
- Pagination: 18 p.
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Serial:
- Welding Research International
- Volume: 6
- Issue Number: 5
- Publisher: Welding Institute
Subject/Index Terms
- TRT Terms: Butt welds; Cracking; Joints; Prefabricated structures; Preventive maintenance; Thermal stresses; Welds
- Uncontrolled Terms: Hot cracking; Welded joints
- Old TRIS Terms: Crack formation prevention
- Subject Areas: Bridges and other structures; Maintenance and Preservation; Marine Transportation;
Filing Info
- Accession Number: 00153033
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: May 31 1977 12:00AM