BASIC LOW HYDROGEN ELECTRODE FOR WELDING MODIFIED 9Cr-1Mo STEELS OPERATING AT ELEVATED TEMPERATURES UP TO 650ºC
RD-16B9
CLASSIFICATION
AWS A5.5 E9016-B9 | EN ISO 3580-A E CrMo91 B
PRODUCT DESCRIPTION
The design emphasis of the chemically basic flux is engineered to ensure the optimum weld metal properties demanded by the specification are fully met. The basic flux containing the appropriate alloying elements but minimal iron powder, is extruded onto a high purity ferritic core wire and bound with a blend of silicates that ensure both coating strength and a coating resistant to subsequent moisture absorption
WELDING FEATURES OF THE ELECTRODE
The chemical nature of the flux together with its controlled coating factor allows the electrode to be used at relatively low amps. This factor together with the fairly fluid but quick freezing slag facilitate vertical up welding including controlled penetration root runs. Overall the arc is very stable, slag detachability is good, fillet welds are slightly
convex and metal recovery is some 98% with respect to weight of the core wire.
APPLICATIONS AND MATERIALS TO BE WELDED
PLATE ASTM A387 Grade 91, TUBES/PIPES ASTM A335 Grade 91, A234 Grade WP91, A199 Grade T91, A213 Grade T91. BS 3604 Grades CFS & HFS 629-470 CFS/HFS 629-590. FORGINGS A182 Grade F91, A336 Grade F91 CAST ASTM A217 Grade C12A, BS1503 Grade 91 PWHT recommended range is 745 - 775ºC (2 hours), pre-heat 200 - 300ºC. Cool to 150ºC before PWHT
WELDING AMPERAGE AC and DC
OTHER DATA
Electrodes that have become damp should be re-dried at 150oC for 1 hour
