This analysis lays emphasis on finding a suitable combination of shielding gas for
welding underframe members such as sole bar of Railway Coaches made of corten
steel; for improved mechanical, metallurgical and corrosion properties of welds
using copper coated solid MIG/MAG welding filler wire size 1.2 mm conforming
to AWS/SFA 5.18 ER 70 S in Semi-automatic GMAW process. Solid filler wire is
preferred by welders due to less fumes, practically no slag and easy manipulation of
welding torch with smooth wire flow during corrosion repair attention, when compared
to Flux cored wire. Three joints using Gas metal arc welding (GMAW) with
shielding gases viz., Pure CO2, (80% Ar – 20% CO2
) and (90% Ar – 10% CO2
) were
made from test pieces cut from Sole bar material of Railway Coach. Study of Mechanical
properties such as tensile strength, hardness and toughness revealed that
welded joint made using shielding gas (80% Ar – 20% CO2
) has better Mechanical
properties compared to the other two shielding gases and comparable to that of Parent
metal. Type of Shielding gas used has influence on the chemical composition and
macro & micro structures. The Tafel extrapolation study of freshly ground samples
in 3.5% NaCl solution revealed that the welded joint made using shielding gas (80%
Ar – 20% CO2
) has also better corrosion resistance which is comparable to the Parent
metal as well as similar commercial steels.
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