the program you posted would look like this:
N1 (USER 3)
N2 G91
N3 G0 A0.0
N4 M8 (GAS ON)
N5 G04 P1.5
N6 M11 P1 (Start Weld)
N7 G01 A-400.0 F1500.00 (ROTATIONAL SPEED)
N8 A-60.0
N9 M10 P1 (Stop Weld)
N10 G04 P1.5 (DWELL FOR POST FLOW TIME)
N11 G0 A520.0 X-0.400 (MOVE TO NEXT START POSTION)
N12 M30
M11 P1 will turn ON Output1 and the next GCode line must be
a axis move
M10 P1 will turn OFF Output1