CWB Level 2 Module 7 Residual Stress and Distortion Questions and Answers

Define Compression ? To reduce in volume, or the state of being compressed. To force together or into less space Define Contraction? To become reduced in size. To pull together, shrink or wrinkle. Define Distortion? The act of distorting. A physical change in shape by bending, twisting or warping. Define Ductility? Capability of being easily molded or shaped Define Expansion? Enlargement or increase. Increase in the dimension of a body Define Intermittent Welding ? Welding that is not continuous over the length of the joint Define Lateral Shrinkage? The process of being drawn together parallel to the line of the joint Define Longitudinally? Running lengthwise or pertaining to length Define Neutral Axis? Occupying a middle position of symmetrical shape. Through the center of gravity. Define Peening? The act of inducing compression into the surface layers of an object. Often performing by striking the surface of a metal object with a ball shaped device, i.e ball-peen hammer, or blasting with specific procedures, i.e shot peening. Define Periphery? The outer part of an object or area Define Residual Stresses? Stresses remaining after a process has been completed. Stress present in a material that is free of external forces or thermal gradients. Define Permanent Deformation ? Shape change that is not reversible by the removal of the forces (plastic deformation) that caused it. Define Restrain? To prevent or limit movement Define Restraint? The act of holding back