S9074-AR-GIB-010/278
TABLE V. Preheat and lnterpass temperature for welded nonferrous alloys.
Maximum interpass temperature *F
Minimum preheat temperature *F
Material Group Number
Supplementary provisions for preheat and interpass temperature 1/
Material Identification
Nickel-chromium- iron and nickel- chromium molybdenlm- columbium Nickel -molybdenum- chromium alloy
Preheating is not required.
-
S-43
350
Preheating is not required.
S-44
-
200
Interpass temperatures greater than 250*F shall require requalification of the procedure with the maximum interpass temperatures to be used for production.
S-51 S-52 S-53
Titanium and titanium alloys
60
250
1.) Preheat and interpass temperatures for dissimilar metal joints shall be those established by welding procedure qualification tests and approval. 6.3.1 Methods of preheating and interpass temperature control. Preheat may be applied by any method which ensures uniform temperature of the joint to be welded. Cyclic heating and severe temperature gradients in the welding area shall be avoided. Interpass temperature shall be controlled by: (a) Proper placement of preheat elements and control of power input.
(b) Proper welding sequences. (c) Proper distribution of welders.
Welding operations shall be shielded from wind and inclement weather until the weldment has cooled to within ambient temperature plus 50°F, unless post weld stress relieving is required and is to be performed inmediately upon completion of welding. Where gas torch flame is used for low terperature preheating, there shall be no condensation in way of welding. 6.3.1.1 Titanium and titanium alloys. Heating of S-51, S-52, and S-53 materials shall be limited to the use of lamps, resistance heaters or induction heating equipment. Use of oxy- fuel gas torches is prohibited. When using resistance heaters or induction coils, contact of the heating elements with the work shall be avoided.
Original 60
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