Bohler Diamondspark 420MC Metalcore MIG Wire

Low Manganese Fume Emission Seamless Metal-Cored Wire

voestalpine Böhler Welding Diamondspark GUARD 420 MC is a seamless metal-cored wire engineered to significantly reduce manganese (Mn) fume emissions while maintaining full structural welding performance.

Designed for welding structural steels up to 420 MPa yield strength, this innovative wire produces approximately 60% lower manganese emissions compared to traditional folded metal-cored wires — helping improve workplace air quality without sacrificing productivity.

This product is manufactured from premium raw material in Italy.

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Key Benefits:

• Up to 60% lower manganese fume emission (lab conditions)

• Supports compliance with stricter Mn exposure limits

• All-position welding capability

• Stable arc with smooth wetting

• Low spatter and easy slag/silicate removal

• High impact toughness down to -50°C

• Low defect rate and strong fatigue resistance

• Excellent feedability with minimal contact tip wear

• Low hydrogen weld metal

• Seamless copper-coated wire design
  

• CWB approved

Designed for Health & Performance:

Diamondspark GUARD 420 MC is engineered to reduce hazardous airborne manganese particles at the source while delivering:

• Consistent weld quality

• Reliable mechanical properties

• Minimal post-weld cleanup

• Increased arc time and productivity

Classifications

• EN ISO 17632-A: T42 4 M M21 1 H5

• EN ISO 17632-B: T494T15-1M21A-UH5

• AWS A5.18 / SFA-5.18: E70C-6M H4

• Polarity: DC+

• Shielding Gas: M21 / M20 (Ar + 5–25% CO₂)

Typical Mechanical Properties (All Weld Metal):

As Welded (M21 / M20):

• Yield Strength: 460 MPa (≥ 420 MPa)

• Tensile Strength: 560 MPa

• Elongation: 27%

• Impact Toughness:

  • -30°C: 90 J

  • -40°C: 80 J

  • -50°C: 60 J

PWHT (620°C / 1h):

• Yield Strength: 400 MPa

• Tensile Strength: 510 MPa

• Elongation: 30%

Typical Applications:

• Structural steel fabrication

• General steel constructions

• Earth-moving equipment

• Road construction machinery

• Heavy fabrication environments

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