Welbach AMPERO 225 Manuel D'utilisation page 13

EN
4. OPERATION
4.1 Supported processes
4.1.1 MMA welding
MMA welding is the oldest method of electrical welding of metal materials, which is applied up to date. High
temperatures of the electrical arc melt the material in the weld site. The electrode melts simultaneously,
providing the filler metal and creating a welding seam. The electrode coating emits gases while melting which
stabilise the electrical arc, protect the liquid metal against the influence of the surrounding air and decrease
burning out of the alloying components. The melting coating also produces slag which is lighter than the
liquid metal, flows onto the welding seam and solidifies there. It results in slowed down cooling and lower
contracting pressure connected with it. The type of used electrodes depends on the welded material and
the type of welding performed. Information on the electrode properties can be found on the producer's site.
The main advantage of MMA welding is the lack of necessity of shield gas application and low price of devices
and used materials.
4.1.2 TIG welding
TIG method welding employs a non-consumable electrode made of tungsten or tungsten with additives.
There is an electric arc formed between the electrode and welded material which is the source of the
necessary heat. The entire assembly, i.e. electrode, arc, welded material, remains in the inert gas shielding -
usually argon, all the time. It is a very "clean" welding process, generating no chips and very low amounts of
poisonous substances, guaranteeing high quality of the welded connection. The most important quality of
the TIG method, as compared to other methods using consumable electrodes, is that the current intensity
andfiller metal feeding have been separated. The welder can select current intensity optimally and add as
much filler metal as necessary in each case.
4.2 Desktop functions
PANEL AMPERO 225
1. GAS PRE–FLOW - gas pre-flow time
2. STARTING AMP. - value of output current upon arc striking.
3. CURRENT UP SLOPE - time over which the value of the output current increases from
the initial current value to the welding current value.
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4.
WELDING AMP.
5. PEAK AMP. - current peak value in the PULS mode.
6. BASE AMP. current sustaining the arch in the PULS mode.
7. CURRENT DOWN SLOPE - time over which the value of the output current decrea-
ses from the welding current value to the initial current value.
8. FINAL AMP. - output current value prior to welding completion.
9. GAS POST–FLOW - gas post-flow time Function used in order to cool down the
weld and to protect it against oxidation.
10. CLEAN SCOPE - percentage difference of negative
and positive welding current value in a single period.
11. CLEAN WIDTH - percentage difference of positive
time and negative current direction in a single peri-
od of welding current. By default, this ratio is 50/50
(setting parameter "0").
12. AC FREQ - alternating current mode output current frequency.
13. PULSE WIDTH - this is the relation of the impulse duration to the impulse period.
Parameter selected in TIG PULSE mode.
14.
PULSE FREQ - impulse frequency during PULS mode welding.
15. PARAMETR ADJUST - after selecting the desired parameter use the knob to adjust its
value. The welder saves data automatically after power supply is switched off. They can
be use immediately upon re-launching.
16.
PARAMETER SELECT - the lit control lamp shows the currently selected parameter.
The lamp indicators will light up from right to left (or left to right), depending on the
selected direction.
EN
Using the CLEAN SCOPE and
CLEAN WIDTH function, the
alternating current balance is
made. This function allows to
control the width of the weld
and depth of fusion.
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