TM 5-3810-294-34
Table 2-3. Suggested Minimum (1) And Maximum Preheat Temperatures For "T-1 "Steel
Inert-gas
Submerged arc process
Manual metal
metal-arc
Alloy wire
Carbon steel wire
Plate thickness (inches)
arc process
process (2)
neutral flux (3)
alloy flux (4)
Between 1 and 2"
150
150
200
300
(1)
A preheat temperature above the minimum shown may be required for highly restrained wire. However, preheat
or interpass, temperature should never exceed 400F for steels through 1 1/2 inch, and 450F above 1 1/2Inch.
(2)
Example: Airco A-632 wire and argon with 1 percent oxygen
(3)
Example: Linde Oxweld 100 wire and 709-5 flux
(4)
Example: Lincoln L61 wire and A0905 X 10 flux
2-9
