Weldtronic TM250C Operating Manual page 28

Welding current setting
Set the welding current after the above preparation. Short circuiting transfer is mainly fit for electrode
wires of diameter 0.6~1.2mm. As a guide for short circuit welding set the welding current according to the
table below.
Wire Diameter(mm)
0.8
1.0
1.2
Welding speed selecting
The welding quality and productivity should be taken into consideration for the selecting of welding speed.
In the case that the welding speed increases, it weakens the protectioneffect and quickens the cooling. As
a consequence, it is not good for weld bead shaping. In the event that the speed is too slow, the
workpiece will be burned through, and a good weld bead will be unavailable. In practical operation, the
welding speed should not exceed 50cm/min.
Wire Stick-out
The increase of the stick-out can improve the productivity, but too long stick-out may lead to excessive
spatter, wire breaking and unstable welding. Generally, the stick-out should be 10 times as the welding
wire diameter.
Shielding Gas flow selection
The protection effect is the primary consideration. Besides, the protection effect of inner-angle welding is
better thanthat of external-angel welding, so the gas flow in inner-angle welding should be lower. Less or
no shield gas is needed in FCAW. Refer to the table below for the recommended gas flow rates.
Welding Mode
Gas Flow(L/m)
24
Welding Current Range(A)
50-120
70-180
80-350
Welding with thin wire
5~15
Optimal Current(A)
70-100
80-120
100-200
Welding with thick wire
15~20
Welding with thick wire
under high current
20~2