• Uy, Brian
• Hicks, Stephen James
• Aslani, Farhad
• Kang, Won-Hee

Abstract

Spiral Welded Tubes (SWTs) are manufactured from steel coil, which is de-coiled and levelled by using cold rolling. The edges of the plate material are bevelled and set for welding containing preheating, if required. The coil is then cold formed into a spiral with a series of rollers and welded into a continuous tube. The rolling equipment applies a significant force to the plate material during production that can increase geometric imperfections in the tube wall. At the spiral welds a high or low imperfection can exist and weld shrinkage could cause local imperfections. Internal residual stresses are the main drawback of SWTs compared with longitudinally welded tubes (LWTs). SWTs offer cost benefits when compared with other types of tubes and they have successfully been used for low-pressure applications, water supply, and structural components. The aim of this paper is to investigate the imperfections, residual stresses, and buckling characteristics of SWTs in comparison with LWTs

Topics

• impedance spectroscopy
• steel
• cold rolling