General purpose rutile 309Mo MMA electrode. Acid rutile electrode made on nearly matching austenitic steel core wire. Moisture resistant coating gives sound porosity-free deposits. Recovery is about 120% with respect to core wire, 65% with respect to whole electrode. Applications There are 3 main areas of application: Buffer layers and clad steels: Overlays on CMn, mild steel or low alloy steels and for joining 316L clad plate. Subsequent layers are deposited with an electrode chosen to match the cladding, eg 316L, 318. Also as a buffer layer prior to hardsurfacing with chromium carbide types. Dissimilar joints: Tolerance to dilution is exploited in joining stainless types 410, 304L, 321 and 316L to mild and low alloy steels such as stiffeners, brackets and other attachments. Service temperatures above 300°C are normally avoided. For some of these applications a more economic alternative may be suitable, eg 309L, 307. Hardenable steels: The high level of alloying and ferrite level tolerates dilution from a wide range of alloyed and hardenable steels to give crack-free welds.