4
Function and description of control panel.
1. Transfer switch:
1) AC/DC transfer switch: The welding machine can be used for AC argon arc welding (for aluminum material)
when locate the transfer switch at “AC” position. The “DC” position is used for DC argon arc welding(for
stainless steel, iron and copper etc.).
2) Hand/foot transfer switch: The current is adjusted by button on the control panel when locate the transfer
switch at “ OFF” position. The current is adjusted by foot step switch when it locates at “ ON” position.
2. Adjusting button:
1) Pre-flow time adjustment knob: It is used to guarantee welding quality. The argon gas should arrive at the
welding position before turning on the current when take a welding operation. The button is used for adjusting
the arriving time difference between argon gas and arc.
2) Current adjustment knob: The knob is used for current adjusting. The knob is available only when the
hand/foot transfer switch locates at “OFF” position.
3) Duty ratio adjustment knob: The current will invert in positive and negative direction circularly when take a
argon arc welding operation. It is positive current time when current flows from tungsten needle to workpiece,
and it is suitable for welding because the tungsten needle has a lower heat quantity and the heat is centralized
at one point. It is negative current time when current flows from workpiece to tungsten and the oxidized
surface can be removed at that time. In such condition, we can get a better welding quality but the tungsten
needle is easy to be burnt from serious heating. The knob can adjust positive and negative current time ratio.
The positive and negative time is 50% each when it locates at “0” position. And the positive current time
becomes longer and negative current time becomes shorter when it locates at “+5” position. Turn the knob in
anticlockwise direction and you will get a contrary result.
Note: Smaller duty ratio should be used when the current is bigger. For example: select a duty ration below
30% for current above 200A. Bigger duty ratio should be used when the current is smaller. For example:
select a duty ratio above 50% for current below 100A.
AC.DC TIG-200 control panel
AC.DC-250, AC.DC TIG-315 Control panel
i