DUCT 3904921 - Caterpillar

Heat Input
Table 7
Quenched Tempered Steel Plate
Permissible Heat Input Table (kJ/mm)
Joint Combined Thickness Manual Metal Arc Welding Gas Metal Arc Welding
3 - 12 mm (0.12 - 0.47 inch) 1.25 - 2.5 1.0 - 2.5
>12 - 25 mm (>0.47 - 0.98 inch) 1.25 - 2.5 1.0 - 3.5
>25 - 32 mm (0.98 - 1.26 inch) 1.25 - 2.5 1.25 - 2.5
>32 - 100 mm (>1.57 - 3.94 inch) 1.5 - 5.0 1.5 - 5.0
Table 8
Recommended Maximum Heat Input (kj/mm)
Joint Combined Thickness
Material 20 mm (0.79 inch) 40 mm (1.57 inch) 60 mm (2.36 inch) 80 mm (3.15 inch) 100 mm (3.94 inch) 120 mm (4.72 inch) 140 mm (5.51 inch)
Hardox 450 1.0 1.8 2.3 2.5 2.5 2.5 2.5
Weldox 700 1.3 2.5 3.5 3.7 3.7 3.7 3.7 Permissible heat input is the amount of heat in kilojoules put into each millimeter of weld travel during each pass. Heat input can be calculated by using the following formula:
Table 9
Heat Input (kJ/mm) = Volts x Amps x 0.06
Travel Speed (mm/minute) Steel Plate
The following information applies to repairs on steel plate used for the structural components of the machines. This information does not apply to engine, transmission, hydraulic components, or non-ferrous components.Cooling Rate
Limitations on both preheat and heat input are necessary to ensure that the heat affected zone cools at an appropriate rate.Cooling is controlled by a balance between preheat and heat input for a particular plate thickness and joint configuration.Preheat, Interpass and Heat Input
The following preheat, Interpass and heat input tables will ensure that the cooling rate of the heat affected area is satisfactory.
Table 10
Steel Plate Preheat and Interpass Temperature
Joint Combined Thickness
<50 mm (<1.97 in)
Material Specification Preheat
°C (°F) Maximum Interpass Temperature
MS106 50 °C (120 °F) 300 °C (570 °F)
MS107 75 °C (170 °F) 300 °C (570 °F)
Joint Combined Thickness
≥50 mm (≥1.97 in)
Material Specification Preheat
°C (°F) Maximum Interpass Temperature
MS106 75 °C (170 °F) 300 °C (570 °F)
MS107 125 °C (260 °F) 300 °C (570 °F) Do not exceed the maximum interpass temperature. The interpass temperature is measured 50 to 75 mm (1.97 to 2.95 inch) each side of the weld, one minute after the weld pass has been made.Excessive interpass temperatures can adversely affect the mechanical properties of the parent metal behind the heat affected zone.Note: Do not overheat the plate. Extra distortion can be induced by too much preheat.
Table 11
Steel Plate Heat Input Table (kJ/mm)
Plate Grade Welding Process
Manual Metal Arc Welding Gas Metal Arc Welding
MS106 1.0 - 2.0 1.0 - 2.0
MS107 1.0 - 3.0 1.0 - 3.0 Permissible heat input is the amount of heat in kilojoules put into each millimeter of weld travel during each pass. Heat input can be calculated by using the following formula:
Table 12
Heat Input (kJ/mm) = Volts x Amps x 0.06
Travel Speed (mm/minute)