Abstract
The purpose of this study is to examine the projectile penetration resistance of the base metal and heat-affected zones of armor steel weldments. To ensure the proper quality of armor steel welded joints and associated ballistic protection, it is important to find the optimum heat input for armor steel welding. A total of two armor steel weldments made at heat inputs of 1.29 kJ/mm and 1.55 kJ/mm were tested for ballistic protection performance. The GMAW welding carried out employing a robot-controlled process. Owing to a higher ballistic limit, the heat-affected zone (HAZ) of the 1.29 kJ/mm weldment was found to be more resistant to projectile penetration than that of the 1.55 kJ/mm weldment. The ballistic performance of the weldments was determined by analyzing the microstructure of weldment heat-affected zones, the hardness gradients across the weldments and the thermal history of the welding heat inputs considered. The result showed that the ballistic resistance of heat affected zone exist as the heat input was decreased on 1.29 kJ/mm. It was found that 1.55 kJ/mm does not have ballistic resistance.
Highlights
The purpose of this study is to examine the projectile penetration resistance of the base metal and heat-affected zones of armor steel weldments
A total of two armor steel weldments made at heat inputs of 1.29 kJ/mm and 1.55 kJ/mm were tested for ballistic protection performance
This paper presents a comparison of the ballistic performance of quenchable armor steel weldments made at heat inputs of 1.29 kJ/mm and 1.55 kJ/mm, which form a 100%
Summary
High-hardness armor steel requires carefully controlled welding procedures to avoid hardness losses in heataffected zones [4,5,6]. Heat input is the crucial factor associated with the toughness of fusion zones in shielded-metal-arc-welding weldments [7,8,9]. The heat-affected zone softening is effectively controlled by maintaining a high peak temperature gradient close to the weld bead [10]. The microstructure and width of the heat-affected zone (HAZ) is a function of the cooling rate imposed by the welding process and the CCT diagram of the base metal plate [11]. Heat input control is aimed at limiting the HAZ width within 15.9 mm, measured from the weld centerline, which is compliant with the standard
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