Ultrasonic impact methods for treatment of welded structures

  • US 6,171,415 B1
  • Filed: 09/03/1998
  • Issued: 01/09/2001
  • Est. Priority Date: 09/03/1998
  • Status: Expired due to Term
First Claim
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1. The method of treatment of a welded structure in the vicinity of weld seams for improving life and load bearing strength, comprising the steps of:

  • applying ultrasonic energy non-destructively without mechanical deformation of said welded structure at a warm external surface area alongside and spaced from a weld seam on said structure being heated by a concurrently used welding arc a multiplicity of shock pulses of a magnitude and sequential relationship to induce internal plasticity in a region below the external surface of the structure, thereby creating a dynamic treatment zone of plastic material adjacent to said weld seam, inducing by reaction to said shock pulses in said treatment zone a gradient stress pattern between the surface area and a remote location in the welded body with reduced stress concentrations in the vicinity of the surface, and withdrawing the shock pulses in a manner that freezes said gradient stress pattern in place to produce a welded product with higher fatigue strength and load bearing capacity.

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