Abstract
Considerable recent attention has been paid to investigating the efficiency of ultrasonic impact treatment (UIT) as one of the post-weld methods for improving the reliability and fatigue lives of welded joints. Investigations were carried out at different times in Russia, Ukraine, France, Japan, Norway, Sweden and the USA. The work under review is intended to determine and study the benefits of UIT according to the IIW Collaborative Test Program on Improvement Methods, by comparison with well-known methods for increasing the fatigue strengths of welded joints. The paper presents comparative fatigue test results for welded specimens in the as-welded condition and specimens treated by hammer peening, shot peening, TIG dressing, ultrasonic impact treatment and a combination of TIG dressing and ultrasonic impact treatment. The specimens were fabricated from structural steel (SSAB Weldox 420). It is shown that, by correctly choosing the conditions, UIT can produce the highest improvement in fatigue life.
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