Gas shielded arc welding flux cored wire

A gas shielded arc flux cored wire used in a direct current positive polarity mode, the flux cored wire comprising:

• a steel sheath;
• and flux encased in the steel sheath, wherein
• the flux contains 0.9 to 2.5 wt % Al, 0.1 to 0.8 wt % Mg and 1.2 to 4 wt % BaF2, each wt % being with respect to a total weight of the wire;
• a sum of an Al content in the flux and three times a Mg content in the flux is in a range of 1.6 to 4 wt %;
• a filling ratio of the flux to the total weight of the wire is in a range of 7 to 20 wt %;
• a total Mn content in the steel sheath and the flux combined is in a range of 0.4 to 1.6 wt %;
• a total content of Si, in a form other than SiO2, in the steel sheath and the flux combined is in a range of 0.001 to 0.6 wt %;
• a total C content in the steel sheath and the flux combined is in a range of 0.005 to 0.08 wt %;
• and
• X=(4Ni+7Mn+20C)/(2Al+Si)≧0.7, where the atomic symbols indicate respective contents of the corresponding elements in the steel sheath and the flux combined in wt % with respect to the total weight of the wire.

A gas shielded arc welding flux cored wire used in a direct current positive polarity mode, the flux cored wire comprising:

• a steel sheath;
• and flux encased in the steel sheath, wherein
• the flux contains 0.7 to 3 wt % Al, 0.1 to 1.2 wt % Mg and 1.2 to 5 wt % BaF2, each wt % being with respect to a total weight of the wire;
• a sum of an Al content in the flux and three times a Mg content in the flux is in a range of 1.3 to 5 wt %;
• a filling ratio of the flux to the total weight of the wire is in a range of 5 to 30 wt %;
• a total Mn content in the steel sheath and the flux combined is in a range of 0.2 to 1.9 wt %;
• a total content of Si, in a form other than SiO2, in the steel sheath and the flux combined is in a range of 0.001 to 0.9 wt %;
• B is present in the flux;
• and
• a total B content in the steel sheath and the flux combined is in a range of 0.001 to 0.02 wt % with respect to the total weight of the wire.