Abstract
The primary purpose of this investigation was to study the characteristics of the armor steel weldment of combat vehicles by using GMAW narrow gap welding (NGW). The results showed that the mechanical properties and residual stress distribution of NGW weldment were improved, compared with conventional X-groove weldment. Additionally, ballistic tests according to MIL-HDBK-1941 were carried out to verify the ballistic ability of NGW weldment and the result showed that the NGW process was qualified for welding the armor steel of combat vehicle.
Highlights
Narrow gap welding (NGW) refers to butt welding applied to a narrow groove between two thick plates, where the gap between the two plates is of Type I, or a similar type
Since stress corrosion cracking (SCC) accidents are frequently caused by the residual stress from welding in many nuclear power plants, maintaining the soundness of device welding, including the welding of pipes in nuclear power plants, is becoming one of the most critical safety issues to ensure the safe operation of nuclear power plants [1,2,3,4]
This study focused on NGW for MIL-STD-12560-grade armor steel, which is used for caterpillar-type and wheeled armored combat vehicles
Summary
Narrow gap welding (NGW) refers to butt welding applied to a narrow groove between two thick plates, where the gap between the two plates is of Type I, or a similar type. The welding design for combat vehicle structures is applied rather conservatively, wherein the bevel angle is excessively wide, or the shape of the welding joint is almost precisely determined to be as verified, since protecting the structure is directly related to the life and death of the crew. In this case, as the thickness of the material increases, issues arise, such as welding deformation and residual stress due to the increased number of welding passes, which are required by the welding bevel angle. A ballistic test was conducted on a NGW part to confirm the protection performance, which is required for the welding part of armored vehicle
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