Experimental Studies On Creep-Resistant Solid And Metallic Wires Deposited Under GMA And PTA Based Wire Arc Additive Manufacturing (WAAM)

This study by Hambal Iqbal et al. compares the use of cored and solid wires in variants of the Wire Arc Additive Manufacturing (WAAM) process, specifically gas metal arc (GMA) and plasma transferred arc (PTA), for 2.25Cr-1Mo steel.

Experimental Studies:

Bead-on-plate trials were conducted for both WAAM processes, evaluating different shielding gas combinations and cored wire usage.

Heat input and deposition rate were analyzed to assess the effects of shielding gases.

Arc behavior was monitored using a process camera, and weld pool morphologies and dilution rates were compared.

Results and Findings:

Heat Input: Cored wire usage provided lower heat input; shielding gas selection introduced variability in heat input.

Microstructure and Hardness:

Bainitic/martensitic microstructures were observed in samples produced with both cored and solid wires.

The PTA process yielded higher hardness values compared to GMA. Additionally, solid wire usage provided slightly higher hardness than cored wire.

Shielding gas selection had a significant effect on hardness.

EDS Analyses:

Element distribution and segregation showed similar results for both wire types.

This study highlights the effectiveness of cored and solid wire applications in WAAM processes, detailing how shielding gas selection and heat input affect microstructural and mechanical properties.

#WAAM | #GMAW | #PTA | #coredwire | #microstructure

For a detailed review, you can access the related study here.