Design and Fabrication of Portable Weld Residual Stress Measuring Device using MBN Principle

Abstract

Residual stress are stresses that remains in an engineering material,
especially metallic materials, after the original applied load has been
removed. Its measurement will help reveal areas in fabricated materials
highly stressed. This paper presents a design of a portable residual stress
measuring device based on the magnetic barkhausen noise principle. This
was achieved by using two permanent magnets, a pickup coil, amplifier
and an analogue to digital converter to create the hardware. The software
was designed using LabVIEW 2019. After fabrication, measuring
experiments on mild steel materials were conducted and the results
obtained from using the device for measurement were compared to
simulated values (Simufact.Weld 6.0) CAD software. Comparing its
results with that obtained from Simulation showed an R
2
value of 77.47%
with a strong correlation of 0.831and a P-value of 0.0071 which was less
than the 0.05 alpha level taken. This device can be adopted in weld
residual stress measurement by artisans and roadside welders for
effective minimization of residual stress and failures associated with it.