Simder MIG 140 - Operation; MMA Welding Mode; MIG Welding Mode

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Before starting any welding activity ensure that you have suitable eye protection and protective
clothing. Also take the necessary steps to protect any persons within the area.
3.1 MMA Welding Mode
After connecting the welding leads as detailed you will need to switch the power switch on the
back panel to “ON”
Select MMA by switching to the MMA welding mode. There is voltage output at both output
terminals. Set the amperage on the machine suitable for the electrode being used. Ensure you
check that you have the electrode polarity correct. Please see below a guide to amperage
required.
Electrode Diameter(mm)
Welding Current(A)
Electrode Diameter(mm)
Welding Current(A)
1.0
20~60
3.2
108~148
1.6
40~84
4.0
140~180
2.0
60~100
5.0
180~220
2.5
80~120
3.2 MIG Welding Mode
Switch the welding mode to 0.8mm flux core or 1.0mm flux core welding mode based on the wire
you were using.
Adjust the “Voltage knob” on the front panel to get proper welding voltage. We will suggest to
start with 50% if you are beginner.
The “Current knob” for wire feeding speed adjusting, we will suggest to start with 30% if you
are beginner. Then Operate the torch trigger, and you can start welding.
Set the welding current after the above preparation. Short circuiting transfer is mainly fit for
electrode wires of diameter flux 0.8/1.0 mm. As a guide for short circuit welding set the welding
current according to the table below.
Wire Diameter(mm)
Welding Current Range(A)
Optimal Current(A)
0.8
50~120
70~100
1.0
70~180
80~120
1.2
80~350
100~200
1) 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 protection effect 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 work-piece will be burned through, and a good weld bead will be unavailable. In
practical operation, the welding speed should not exceed 50cm/min.
2) 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.
3.OPERATION