preheat AWS D1.1



Preheat requirements:

AWS D 1.1

Category
Sample materials
Thickness (mm)
Preheat (°C)
A A36, A106Gr B, A 516, API 5L Gr B, API 5L X42 SMAW with other than low- hydrogen electrodes 3 – 20
>20 to 38

>38 to 65

> 65 0
0
65
110
150
B A36, A106Gr B, A516, API 5L Gr B, API 5L X42SMAW with low- hydrogen electrodes,
SAW, GMAW, FCAW
3 – 20
>20 to 38
>38 to 65
> 65 0
0
10
65
110
C API 2W Grade 60, API 2Y Grade 60
API 5L Grade X52
SMAW with low- hydrogen electrodes,
SAW, GMAW, FCAW
3 – 20
>20 to 38
>38 to 65
> 65
0
65
110
150
D ASTM A 710 Grade A (All classes)
ASTM A 913 Grades 50,
SMAW, SAW, GMAW, and FCAW with electrodes or electrode- flux combinations capable of depositing weld metal with a maximum diffusible hydrogen content of 8 ml/ 100 g (H8), when tested in accordance with AWS A4.3.
All thickness > = 3mm 0