FIELD: mechanical engineering. SUBSTANCE: device comprises housing, fixed block with the bearing surface, and hummer with a shaped surface. The fixed block is made up as a base with guides and anvil. The base is secured to the housing. The anvil is mounted for setting movement over the guides by way of a device for moving the anvil. The anvil is spring-loaded with respect to the base by a flexible member. The hummer is mounted for permitting reciprocation. The bearing surface for interaction with the undeformed portion of the joint obtained is positioned on the anvil. EFFECT: enhanced reliability. 6 cl, 3 dwg
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