| 摘要 |
This invention provides methods of treatment for welded products by pulse impact energy, preferably ultrasonic, at original production, during the active life period for maintenance and after failure in a repair stage to improve the strength at the weld sites and to fashion stress patterns that reduce stress centers and micro-stress defects. The basic method steps are nondestructive in nature, inducing interior pulse compression waves that temporarily plasticize the metal to relax stresses and redistribute stress patterns in a gradient of metallic grain structure between a higher strength substantially grainless white layer at the weld seam to an internal base metal region in the welded body. Thus, a renewed longer life span and higher strength weld joint regions are generated in welded products.
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