Seminar - Tim Wilkinson - Effect of GMAW on the Mechanical Properties of In-line Galvanised Cold-Formed Steel

Wednesday, October 25, 2000, 3 - 4 pm
Civil Engineering Lecture Room 3

Abstract

This presentation describes tensile tests to examine the effect of various welding procedures on the mechanical properties of in-line galvanised cold-formed steel. Cold-formed flats in either Grade C350 or Grade C400 were butt welded. The dip transfer method or the spray transfer method were used to provide a variety of heat inputs, and two different welding electrodes, Autocraft LW1 and Autocraft Mn-Mo, were used. The thicker (8 mm) Grade C350 steel displayed a small reduction in the yield and ultimate stresses when welded compared to the unwelded steel. The 3.8 mm Grade C400 samples displayed a more significant drop in yield and ultimate stresses when welded, and the drop in strength was greater when the higher heat input spray method was used. On some occasions the ultimate strength of the welded 3.8 mm specimens dropped below the yield stress of the parent material.