Why is the control of residual stress critical in continuous welded rail (CWR) welding procedures?
Controlling residual stress is critical in continuous welded rail (CWR) welding procedures because uncontrolled residual stress can lead to track buckling in hot weather or rail breaks in cold weather. Continuous welded rail is created by welding together sections of rail, often hundreds of feet long, to eliminate joints. These joints are sources of weakness and require frequent maintenance. However, the welding process introduces residual stresses into the rail. Residual stresses are stresses that remai....
Community Answers
Sign in to open profiles and full community answers.
Gunasekar D
“Control of residual stress in continuous welded rail is critical because residual stress directly affects the structural integrity , track stability and long-term safety of the rail. Residual stress is the internal stress that remains in the rail material after welding . Even when no external forces are applied . It results from thermal expansion and contraction during welding, uneven cooling rates, mechanical deformation during grinding. CWr is laid without expansion joints , so it relies on internal stress balance. Excessive tensile or compressive rsidual stress can lead to thermal buckling in hot weather or rail fracturs in cold weather. Unctrolled residual stress can cause rail distortion, affecting alignment and gauge. Controlled cooling and post welkd tratement sensure welds remain ductils and strong.”
100.0%