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Low Current Plasma Arc Welding.
GENERAL MOTORS CORP INDIANAPOLIS IN ALLISON GAS TURBINE DIV
The objective was to conduct a process optimization of the Linde 100-amp, low current plasma arc welding process using five aerospace materials common to gas turbine engines. Materials selected were AMS-5521 310 SS, -5505 410 SS, -5597 Inco 718, -4911 Ti6Al-4V, and -6350 4130. Included were thicknesses of 0.015 through 0.125 in. Test panels for manual and machine welding included square butt, edge, lap, and T-joints. Single-pass, keyhole mode, machine welding with the addition of filler material for square butt joints was highly successful for gages of 0.048 through 0.125 in. Keyhole welding provided assured penetration, significant reduction in weld bead width, lower amperage requirements, and higher travel speed. Fillet welding of lap and T-joints was not successful for some gages of material. In comparison with GTA welding, plasma arc offers increased flexibility assured penetration keyhole-square butt joints greater thickness capacity at 100 amp reduced need for operator skill improved equality and potential cost savings. Application of this process would definitely be beneficial in areas of square butt and edge joints.
Final technical rept. 16 Jul 69-29 May 70,