Welding Characteristics and Guidelines for FGNM® Profiles

FGNM® profiles are easily welded and excellent for the construction of any type of bucket.

When welding, it is important to follow several general rules:

• Make sure that the surfaces to be welded are clean and dry.

• Use a welding material with low hydrogen content.

• Balance the welding sequence so as to minimize residual stresses. In fact, welding adds a significant amount of heat and can deform the profiles.

• Preheat when the profile to be welded is thicker than 30 mm, the ambient temperature is below +5°C or the air is very humid.

Recommended preheating temperatures:
FGNM 400 = 80°C
FGNM 500 = 180°C
FGNM 250 steel does not require preheating. Preheating is only recommended when the ambient temperature is 0°C.

The Carbon Equivalent Value (CEV) is a good indicator for assessing the weldability of the steel based on its alloys and determining the welding temperature.

0.59 (10 to 20 mm - 0.4 to 0.8 in thick)

0.62 (25 to 50 mm - 1 to 2 in thick)

The low Carbon Equivalent Value of these steels can greatly reduce the risk of hydrogen cracking during welding.