Select $70C-6$ data sheet shows the following information on the deposit chemistry and tensile strength of the deposit. Please explain why the tensile strength increases with increasing amount of argon in the shielding gas. $(3)$

TYPICAL WELD DEPOSIT CHEMISTRY $[$WT$\%]$

$\backslash$table$[[$Shielding Gas,$C,Cr,Cu,Mn,Mo,Ni,P,S,Si,V$