A Study on the Establishment of Alternative Verification Standard of Ballistic Ttest for Armored Steel Arc Welding Procedure

Abstract

The final goal of this study is to secure the basis for establishing a domestic test standard such that the H-plate ballistic test for weld verification required by TACOM Drawing 12479550 can be replaced with the Charpy impact test. The core of this study is to prove the correlation between the ballistic test and the impact test. As a result of ballistic test specimens manufactured with various welding parameters, the generated crack length showed a correlation of approximately 78% with impact toughness. In addition, cracks occurred at the weld toe and propagated along the fusion line irrespective of any variables. Therefore, the notch location of the impact test specimen was determined by the fusion line. Moreover, experiments proved that impact toughness did not change significantly when changing non-essential welding variables. The impact toughness of the fusion line critical values of MIL-A-12560 and MIL-A-46100 materials used in this study were 50 J and 22 J, respectively. This value exceeded the impact toughness management standard for the base material. Therefore, the passing threshold value was ultimately determined to be above the impact toughness threshold of the base material.