IACS WELDING CONSUMABLE GRADING
Filler metals are divided into three groups:
- normal strength filler metals for welding normal strength hull structural steels,
- higher strength filler metals for welding normal and higher strength hull structural steels with minimum yield strength up to 355 N/mm2,
- higher strength filler metals for welding normal and higher strength hull structural steels with minimum yield strength up to 390 N/mm2.
Each of the three groups is based on corresponding tensile strength requirements.
Each filler metal group is further divided into several grades:
- Grades 1, 2 and 3 for ordinary-strength filler metals,
- Grades 1Y, 2Y, 3Y and 4Y for higher strength filler metals for steels up to 355 N/mm2 yield strength,
- Grades 2Y40, 3Y40, 4Y40 and 5Y40 for higher strength filler metals for steels up to 390 N/mm2 yield strength.
The Grade assignment is given in respect of Charpy V-notch impact test requirements.
For each strength basic group, welding consumables, which have satisfied the requirements for a higher toughness grade are considered as complying with the requirements for a lower toughness grade.
Correlation of welding consumables to hull structural steel grades
The correlation between the hull steel grades and the welding consumables grades that must be used for the hull steel welding, is stated in the following table.
- When joining normal to higher strength structural steel, consumables of the lowest acceptable grade for either material being joined may be used.
- When joining steels of the same strength level but of different toughness grade, consumables of the lowest acceptable grade for either material being joined may be used.
- It is recommended that controlled low hydrogen type consumables are to be used when joining higher strength structural steel to the same or lower strength level, except that other consumables may be used at the discretion of the Society when the carbon equivalent is below or equal to 0.41%.When other than controlled low hydrogen type electrodes are used appropriate procedure tests for hydrogen cracking may be conducted at the discretion of the Society.
Reference: IACS Req. 1986/Rev.5 2018