Abstract: The influence of ferrite contents in duplex stainless steel weld metal on hydrogen cracking susceptibility was investigated quantitatively by means of the Longitudinal Butt-Tensile Restraint Cracking (LB-TRC) test and the Weld Metal-Slow Extension Rate Test(WM-SERT) methods and by using laboratory made filler wire with various compositions and TIG welding method with Ar+H₂ mixed shielding gas. It is shown that the weld metal is not susceptible to hydrogen cracking until the ferrite contention duplex stainless steel weld metal reached 50%, and when ferrite content is more than 50%, its hydrogen cracking susceptibility markedly increases with the increase of ferrite content.