Migomag SIM 200 LCD - Page 35

Migomag SIM 200 LCD
Model No ASIM200LCD
32
Constant poor arc characteriscs
Check that the:
1. Correct polarity has been selected for work and weld cables (refer page 10).
2. Shielding gas is correct for the consumable wire in use (refer page 12).
3. Welding circuit is making good electrical connecon. Ensure that the work clamp is
securely ghtened onto the work piece so that good electrical contact is achieved
4. All connecons in the external welding circuit are clean and ght. Problems may show
as hot spots
5. Work piece surface is not contaminated. Water, oil, grease, galvanising, paint, or oxide
layers can severely disturb the welding arc and result in a poor weld.
Porosity in weld caused by lack of shielding gas
1. Check that the correct gas ow rate has been set (refer page 12)
2. Check for leaks in the gas hose. Replace if leaking
3. Check for leaks in gun/cable assembly, eg. fractured gas hose, broken or missing ‘O’
rings. Replace as required.
4. Check the gun nozzle is free from spaer and is rmly aached to the welding gun to
ensure that no air is being drawn into the shielded area.
Service Informaon
The following informaon is intended for use by qualied service personnel.
When the unit is energised LETHAL VOLTAGES are present on the electrical
and electronic components. It is not intended that persons without suitable
training and knowledge aempt to perform service tasks on the components of this
welder.
Before removing the equipment cover, ENSURE that the equipment is disconnected from
the mains power supply. When the equipment is energised LETHAL VOLTAGES are present
on the electrical components enclosed.