What is the difference between S-G1 and S-G2 grades?

S-G1 is for general purpose welding of mild steel, while S-G2 provides a weld with higher tensile strength due to slightly different chemical composition (Table 1 and Table 2).

What are the standard lengths supplied for these rods?

The filler rods are typically supplied in straight lengths of 500 mm or 1000 mm as per Clause 6.2.

What mechanical tests are required for the weld metal?

The all-weld-metal must be tested for tensile strength and elongation as specified in Table 2. An impact test is also required for certain grades.

Is this code applicable for TIG or MIG welding?

No, this standard is explicitly for gas welding filler rods. For TIG/MIG welding of steel, refer to standards like IS 6419 or IS 6560.

IS 7280

: 1974

Filler Rods and Wires for Gas Welding of Steel

CurrentSpecializedSpecificationMaterials Science · Steel and Reinforcement

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This standard specifies the requirements for seven grades of steel filler rods and wires intended for gas welding processes, primarily oxy-acetylene welding. It covers the classification, chemical composition, mechanical properties, dimensions, tolerances, and marking for these consumables.

Specifies requirements for filler rods and wires used for gas welding of steel.

Quick Reference Values

Tensile Strength (S-G2 Grade)440-520 N/mm²

Minimum Elongation (S-G2 Grade)22%

Standard Rod Length500 mm or 1000 mm

Standard Diameter Range1.6 mm to 6.3 mm

Maximum Carbon Content (S-G1 Grade)0.10 %

Maximum Sulphur Content (All Grades)0.040 %

Practical Notes

This standard is specific to gas welding (oxy-acetylene), which is a less common process in modern heavy fabrication. For arc welding processes like TIG/MIG, refer to other relevant IS codes (e.g., IS 6419).

The selection of the filler rod grade (e.g., S-G1, S-G2) is critical and should match the properties of the base steel being welded to ensure weld integrity.

The standard is quite old (1974), though reaffirmed. Always check for the latest version and ensure it is suitable for the project's specific material and quality requirements, which may reference newer global standards like AWS.