DEVELOPMENT OF FUSION WELDING TECHNIQUES FOR TWO INCH THICK TITANIUM PLATES (GRADE RS70, COMMERCIALLY PURE)
REPUBLIC STEEL CORP CANTON OHIO
Pagination or Media Count:
Welding techniques for 2 in.-thick, commercially pure RS70 Ti plate were investigated. One of the 2 sets of these plates, machined to a modified double-V joint design, was welded using the W arc, inert gas shielding method. Some preliminary welding was done on 2 short lengths of 2-in. thick RS70 plate material to check the cooling and shielding characteristics of the welding set up. Two primary factors in the production of good welds in Ti appear to be 1 rapid cooling of the weld metal to low temperatures and 2 effective shielding of the weld area during the cooling cycle. Additional efforts included base and weld metal hardness checks on a cross section of the initial weld and chemical and vacuum fusion analysis of the 0.063 in.-diam, RS55 welding wire. A 1300 F vacuum annealing cycle on one coil reduced the H level to 25 ppm.