the annealing cycles in the dunham book are not very conservative for larger work, i found this after using them religously but then upon checking with a polariscope the holds werent long enough and the ramp down i slowed considerably. for about an hour and inch is what i do. so 1 1/2" at least 1 1/2 -2 hrs. hold 1050 ramp 50-60 per hour to 900 then off.could do down to 910 strain point and another hold, ive not found this nec. i just do about 60/hr to 900 then off.
ro
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Gtt Mirage torch with tanked oxygen.
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