Metrode Ultramild description: Ultramild gives a soft, ductile low strength weld metal designed to absorb high shrinkage strains and minimise the build-up of residual stresses. It is a basic low hydrogen electrode with the lowest levels of alloying, microalloying and deoxidation compatible with satisfactory radiographic quality, resulting in ductile weld metal of about 300MPa yield strength. Applications include repair of fabrication-induced cracks in CMn and low alloy steels, buttering layers to avoid lamellar tearing in areas of high restraint, restrained root runs under adverse conditions of low ambient temperature (-20°C) and minimal or no preheat, and welding of steel conductor rails requiring high electrical conductivity.