T.O. 1-1A-9 TABLE 2-19.  FUSION WELDING CHARACTERISTICS OF NICKEL-CHROMIUM-IRON AND NICKEL ALLOYS ALLOY/DESIGN RECOMMENDED FILLER MATERIAL/SPEC HEAT TREATMENT REMARKS TYPE STRUCTURE  MAT’L ELECTRODE ROD PREHEAT POSTHEAT TREAT Inconel --------------   “62" MIL- ----------------------    ----------------------   This alloy is read- Alloy 600 Inconel R-5031 ily weldable with CL8A high joint efficiency. "'42" AMS Inconel "62" weld- Inconel 5679 ing wire is re- commended for MIL-R inert gas method -5301 and tungsten arc. CL 8 Inconel "42" is MIL-R recommended -5683. where inert gas is not used.  When gas welding a slight reducing flame should be used. Inconel --------------   -"69" -----------------------  MIL-R Severely After stress This alloy can be Inconel -5031 cold work- relieving fusion welded by CL 14 ed material welded assem- various methods should be bly should be and resistance stress re- aged at 1300 welded.  Fusion lieved at F, 20 hours. welding of Inconel 1500F, 8 X should be con- hours with fined to annealed part being or cold worked rapidly material.  The brought up tungsten arc and to heat. inert gas shielded methods using In- conel X welding wire can be used to weld these con- ditions.  Welding of aged material without cracking is only possible by the safe end method of adding Inconel edges to the Inconel X sec- tions before heat treating and then welding the sate ends together with Inconel. Hastelloy --------------   Hastelloy  -----------------------  MIL-R Casting See Re- Alloy can be weld- C C -5031 should marks. ed by all convents CL 11 be pre- ional methods. Hastelloy MIL-R heated However, the oxy- W -5031 to 1200°- acetylene method CL 12 1400F. is not recommended 310 (See for parts to be used Re- in corrosive appli- marks cations because of MIL-R carbon pickup. -5031 Weldability of this 2-101