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The wire melting behavior in pure Ar shielding gas can be controlled with a coaxial hybrid solid (CHS) wire which has a coaxial double structure with a different composition in its inner and outer parts. This wire can prevent the generation of a column of liquid metal (CLM) at the wire tip due to the difference in the materials properties of the inner and outer parts and stabilize MIG welding in pure Ar shielding gas (Ar-MIG welding). We examine the effects of the material properties (melting temperature, specific heat and thermal conductivity) on the wire melting behavior, then propose and show the effectiveness of a design guide for the CHS wire by carrying out a simulation and a welding examination on the new CHS wire which was developed based on this design guide.

Control of wire melting behavior using coaxial hybrid solid wire