Welding of Armor: Summary of Ballistic Shock Test Results on 1-1/2 Inch Homogeneous Armor 'H' Plates Welded with Austenitic Electrodes and Tested at Aberdeen Proving Ground during the Period from 1 October 1942 through 31 March 1943
WATERTOWN ARSENAL MA
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Data from 172 Aberdeen Proving Ground firing records have been tabulated on accompanying charts and tables. Within the range of chemical composition of commercial rolled homogeneous armor, steel quality was indicated as having more influence on ballistic performance of hand welded plates than variations in chemical analysis. Armor compositions of very high hardenability have been successfully welded. While superior ballistic performance was indicated for certain brands of electrodes, no grouping of electrodes according to chemical analysis was possible on the basis of ballistic efficiency. Improved shock test results were obtained when two or more beads were deposited at the root, when stringer beads or overlapping beads rather than a full weave were used for the body, and when an annealing bead technique was employed. Of twenty-six Unionmelt welded plates, only two were comparable in ballistic performance to satisfactory hand welded plates. These two plates failed the radiographic examination. Cast assemblies shows a higher proportion of cracking in the unaffected plate than in the weld, fusion, and heat-affected zones. Ratio of plate to weld cracking decreases with increase in hardenability and with improvement in radiographic soundness of cast armor.
- Properties of Metals and Alloys