Research on the manufacturing process of large caliber projectile body blanks based on inertia friction welding

DOI:	10.11809/bqzbgcxb2024.12.008
Keywords:	large caliber projectile body blanks; inertia friction welding; tensile testing; microstructure; impact testing; metallography
Abstract:	In response to the issues of low material utilization, low production efficiency, and high production costs in the production of large caliber projectile body blanks using the integral hot upsetting process, a new process is proposed for segmental design and inertia friction welding of projectile body blanks. With this process, each segment of the projectile body blank is forged separately and then welded together using the inertia friction welding method to obtain an integral projectile body blank. After welding, the weld joints were subjected to tensile, impact, metallographic, and scanning electron microscopy (SEM) tests. The test results revealed that the width of the welded zone was only 0.6 mm, with grain refinement observed. After heat treatment of the welded joints, the microstructure of the weld zone became homogenous with the base material. The tensile strength of the heat treated welded joints was 1 198.4 MPa, equivalent to 93.5% of the strength of the heat treated base material. The impact energy was 233 J/mm2, indicating higher toughness than the base material. The experimental results demonstrate that the inertia friction welding method can weld the projectile body blanks in just 120 seconds, and the connection strength of the weld joints meets the requirements for use. Compared to integral hot upsetting of the blanks, the segmented hot upsetting method for manufacturing projectile body blanks can greatly reduce the forging difficulty, shorten the forging time, improve the production efficiency of the blanks, and reduce production costs,metallography.
Issue:	Vol. 45 No. 12 (2024)
Published:	2024-12-30
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