Tests on Inert-Gas Metal Welding of Corrosion Resisting Aluminum Alloy "ANP" Plates (Report 2)

Abstract

Various tests on the inert-gas metal -arc welding of a corrosion resisting aluminum-manganese alloy "ANP", have been performed with ANP-O and ANP-1/4H plates, 1/4 in. in thickness, and various.consumable electrode wires, 52S, A54S, 56S and ANP. The present report Part 2 discusses the effects of welding conditions, surface treatments, filler wires, preheat and back-chipping on the occurence of porosities in bead weld or buutt weld, as well as the cracking tendencies of various filler wires in welding a slit-type cracking specimen.
The essential factors to prevent porosities have been shown to be; chemical cleaning of filler wire, adequate arc length, higher heat input, less magnesium content, proper backing and precautions in the back pass, that is, back-chipping, slower welding speed or preheat. Electrode wires, ANP and A54S, were the least crack-sensitive.