Toughness Evaluation of Electrogas and Electroslag Weldments
AMERICAN BUREAU OF SHIPPING NEW YORK
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Recent modernization in shipbuilding methods and facilities in both foreign and U.S. shipyards has been directed in large part to improvements in welding technology. Higher deposition rates offered by automatic and semi-automatic processes offer substantial cost savings in many areas of shipyard welding. Processes such as electroslag and electrogas welding of vertical side shell and bulkhead butts produce welds which offer better appearance and uniformity at substantially lower cost than manual stick electrode welding. Unfortunately, high heat input at comparatively low travel speeds adversely affects the toughness properties in both the weld and the heat affected zone. Charpy Vee notch tests are the basis of evaluation used by ABS and other classification organizations to evaluate toughness. In view of the relatively large and increasing extent of these welds it is felt that a more definite criteria of toughness should be established. More enlightenment in this area might justify relaxation of some of the present restrictions particularly with respect to higher strength steels used in high stress areas such as the bilge and shear strake.
- Fabrication Metallurgy
- Marine Engineering