Table 2. Suggested Preheat and Interpass Temperatures for ASTM A514 Steels

TB9-2510-242-40

Table 2. Suggested Preheat and Interpass Temperatures for ASTM A514 Steels

MINIMUM

MAXIMUM

PREHEAT AND

THICKNESS

INTERPASS

RANGE (IN)

TEMP (F)

Up to 0.75

400

0.76 to 15

125

400

1.51 to 2.5

175

450

Over 2.5

225

450

b. Welding Heat Input . The total welding heat input is determined by three factors: welding voltage, amperage,

and speed. To determine the total heat input for a given weld, use the following formula:

Heat

Input (kJ/in) = Amperes x Volts x 60/ 1000 x Speed (in per minute)

When welding T-1 steels, the total welding heat input must be equal to or less than the values given in Tables 3 and 4.

Given the preheat temperature and base metal thickness, the above heat input formula can be used to ensure than the

heat input remains within the limits given in the table. The heat input can be adjusted by decreasing welding amperage

and voltage or by increasing the welding speed. Note: The total heat input referenced in Tables 3 and 4 applies to

individual weld passes and is not considered cumulative.

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