Effects of local ultrasonic impact treatment on residual stress in an engineering-scale stainless steel pipe girth weld. (August 2021)

• Record Type: Journal Article
• Authors: Liu, Chuan; Lin, Changhua; Liu, Weihua; Wang, Shuang; Chen, Yuefeng; Wang, Jianfei; Wang, Jianxin
• Is Part Of: International journal of pressure vessels and piping. Volume 192(2021)
• Publication Date: 2021-08
• Subjects: Stainless pipe girth weld -- Welding residual stress -- Ultrasonic impact treatment -- Contour method -- X-ray diffraction method; Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2021.104420
• Languages: English
• ISSNs: 0308-0161

Abstract

Abstract: An engineering-scale stainless steel pipe girth weld was manufactured and the ultrasonic impact treatment (UIT) was applied to treat the local region of the girth weld. The as-welded and the after-UIT surface stresses were measured with the X-ray diffraction (XRD) method, and the internal stress distributions on the planes across the treated zone were measured with the contour method. The effects of local UIT on the stress distribution of the girth weld were investigated. Results show that UIT on the stainless steel pipe girth weld can introduce compressive stress on the impact surface despite the initial as-welded stress state (tensile or compressive); UIT can affect the stress distribution in the stainless steel pipe girth weld up to 8 mm depth and induce a compressive stress layer at the treated region with a depth of 4 mm, the peak value of the compressive stress occurs at the location of 1 mm depth beneath the surface, and it has little effect on the stresses near the inner surface and those outside the treated region. Graphical abstract: Image 1 Highlights: Ultrasonic impact treatment (UIT) has a local effect on the stress in the girth weld. UIT can introduce compressive stress despite the initial as-welded stress state. UIT induces a compressive stress layer at the treated region with a depth of 4 mm. UIT can affect the stress in the stainless steel girth weld up to 7 mm depth.