Docol 1300M Micro-Jet-Cooled Weld in Microstructural and Mechanical Approaches concerning Applications at Cyclic...

Area of Science:

• Materials Science
• Metallurgical Engineering
• Welding Technology

Background:

• Advanced high-strength steel (AHSS) applications extend beyond mechanical properties.
• Optimizing the weldability of specific AHSS grades like Docol 1300M is crucial for industrial use.
• Existing welding techniques require refinement to achieve desired microstructural and mechanical characteristics in AHSS.

Purpose of the Study:

• To improve the welding process for Docol 1300M advanced high-strength steel.
• To achieve acceptable microstructure and mechanical parameters in welded joints.
• To investigate the effect of novel shielding gas mixtures and filler materials on weld quality.

Main Methods:

• Gas Metal Arc Welding (GMAW) process was employed.
• Varied electrode wires to adjust carbon content and added nitrogen to argon shielding gas.
• Conducted non-destructive and destructive tests, including tensile, bending, light microscopy (LM), and scanning electron microscopy (SEM).

Main Results:

• Successfully manufactured Docol 1300M steel joints with enhanced properties.
• Identified optimal welding parameters and filler materials.
• Fatigue test results validated the proposed welding methodology.

Conclusions:

• The novel use of argon-nitrogen shielding gas mixtures in GMAW for AHSS welding is effective.
• Formation of titanium non-metallic inclusions significantly strengthens the fusion zone.
• The developed welding process enhances the overall performance properties of Docol 1300M steel joints.