There are several specific welding requirements for RINA AH32 Steel Plate:

Pre-welding Preparation

 

Cleaning: The surface of the steel plate must be thoroughly cleaned before welding to remove any dirt, grease, rust, paint, or other contaminants. These substances can cause porosity, lack of fusion, or other defects in the weld. Cleaning methods may include wire brushing, grinding, or using solvents, depending on the nature of the contaminant1.

Beveling and Groove Preparation: Appropriate beveling or groove preparation is often necessary, especially for thicker plates. This helps to ensure complete penetration of the weld and provides better access for the welding electrode or filler metal. The bevel angle and root face dimensions should be in accordance with the welding procedure specifications (WPS) and the requirements of the RINA classification society.

Fit-up: The edges of the plates to be welded should be properly aligned and fit together with a small, uniform gap. This gap allows for the proper deposition of filler metal and ensures good fusion between the base metal and the weld. The fit-up tolerance should be within the specified limits to avoid excessive stress concentrations and welding defects.

Welding Process Selection

 

SMAW (Shielded Metal Arc Welding): When using SMAW, electrodes that are compatible with RINA AH32 steel should be selected. These electrodes typically have a low hydrogen content to reduce the risk of hydrogen-induced cracking. The electrode diameter and welding current should be chosen based on the plate thickness and welding position to achieve proper penetration and bead formation.

GMAW (Gas Metal Arc Welding): For GMAW, the choice of shielding gas is crucial. Commonly used shielding gases for RINA AH32 steel welding include mixtures of argon and carbon dioxide. The gas flow rate should be adjusted to provide adequate protection to the weld pool from atmospheric contamination. The wire feed speed and welding voltage need to be carefully set to control the deposition rate and the quality of the weld bead.

FCAW (Flux-Cored Arc Welding): FCAW can also be used for welding RINA AH32 steel plates. The selection of the flux-cored wire depends on the specific requirements of the application, such as the welding position, plate thickness, and desired mechanical properties of the weld. Similar to GMAW, proper control of the welding parameters, including wire feed speed, welding current, and voltage, is essential for obtaining high-quality welds.

 

 

 

 

 

 

 

Grade	Thickness(mm)	MinYield(Mpa)	Tensile(Mpa)	Elongation (%)	Min Impact Energy
RINA Grade AH32	8mm-50mm	Min 315Mpa	440-590Mpa	22%	-	34J
	51mm-70mm	Min 315Mpa	440-590Mpa	22%	-	38J
	71mm-100mm	Min 315Mpa	440-590Mpa	22%	-	46J
The min impact energy is longitudinal energy

 

 

 

 

 

 

 

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