Gas Metal Arc Welding (GMAW/MIG/MAG) and Flux-Cored Arc Welding (FCAW) are widely used for joining S355J2 grade steel, a high-strength low-alloy structural steel. Below is a detailed guide to the gas-shielded welding processes for S355J2:

1. Selection of Welding Consumables

Solid Wire (GMAW/MIG/MAG)

AWS Standard: ER70S-6

Chemical composition: C ≤ 0.10%, Mn: 1.40-1.85%, Si: 0.80-1.15%

Features: Excellent deoxidizing properties, low impurity content, and good compatibility with S355J2's mechanical properties (yield strength ~355 MPa).

EN Standard: G 46 2 M G

Minimum yield strength: 460 MPa

Impact toughness: ≥27 J at -20°C, ensuring matching toughness with S355J2 (J2 grade requires -20°C impact resistance).

Flux-Cored Wire (FCAW)

AWS Standard: E71T-11 (for all-position welding) or E71T-8 (high toughness)

Suitable for outdoor applications due to strong wind resistance.

EN Standard: T 46 3 M 21 H5

Contains alloying elements (e.g., Mn, Si) and flux for slag protection, reducing porosity risks.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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