Product description

For welding 550MPa-grade weathering steels** using argon-rich mixture shielding gas (e.g., 80%Ar+20%CO₂). 

Applicable to:

- Corrosion-resistant structures: Bridges, rolling stock, offshore engineering

- High-strength equipment: Heavy machinery (e.g., excavator buckets), ships, containers (Q390/Q420 steel)

- Cost-efficient manufacturing: Automotive chassis, pressure pipelines (compatible with CO₂ gas for lower cost)  

Shielding Gas: CO₂+Ar

Available Diameter (mm): 0.8 / 1.0 / 1.2 / 1.6

Mechanical Performance of Deposit Metal

Tensile Strength MPa (N/mm²): Requirement ≥550, Actual Result 615

Yield Strength (MPa): Requirement ≥470, Actual Result 528

Elongation A (%): Requirement≥17, Actual Result 27

Impact Energy (J): Requirement -30℃≥27, Actual Result 77

Chemical Composition (%):

Welding Parameters

Current Polarity: DC+ (Direct Current Electrode Positive)

Precautions:

1. Shielding Gas: 

   - CO₂ option (≥99.5% purity) for cost reduction   

   - Argon-rich mixture (e.g., Ar+20%CO₂) recommended to ensure toughness  

2. CO₂ shielding gas flow rate shall be maintained at 20–25 L/min during welding. (calibrated flowmeter required).

3. Wire stick-out shall be controlled within 15–25 mm.

4. Wind Protection: Mandatory when wind speed >1.8 m/s.