Soft |
Dark grey |
Long Yellow lines |
Low carbon Cast steel |
|
| Malt-grey cast iron colour |
Red feathery lines |
Cast iron |
Pre-heating Peening
Slow cooling |
| Hard |
Dark grey |
Long Yellowish- white lines with starts |
High carbon steel Low alloy steel |
Pre-heat heavy sections to 150°C |
| Shiny grey |
Yellowish-red coarse lines |
13% Cr steel |
Can be pre-heated |
| Soft |
Bright silver-grey |
Yellowish-red coarse lines |
Austenitic stainless steel |
Low interpass |
| Reddish-yellow shiny |
No visible sparks |
Copper alloys |
Pre-heat coarse materials to 200-300°C |
| Shiny Very light |
No visible sparks |
Aluminium alloys |
Pre-heat coarse
materials to
150-200°C |
| Hard |
Matt-grey cast iron colour |
Yellowish-white lines and sparks |
14% Mn steel |
Low interpass |
