Taseto RNY309 description: TASETO RNY309 is designed to increase the ferrite content in its all weld metal, so it is mainly used for welding of dissimilar metals joint such as stainless steel to mild steel or to low alloy steel and the first layer of overlay welding to carbon steel or low alloy steel. RNY309 is a lime-titania type electrode suitable for positional welding.