- 13 - PATON ProTIG AC/DC TIG/MMA
Typical cyclogram of the 2-stroke button mode (TIG АC/2T)
In modern handheld TIG welding torches, there is a button to control the welding
process, which is connected to the device. Consider the two modes of 2-stroke
operation.
There is purging before welding and smooth increase of current to the set value for
the time Tp. After releasing the button, the set current smoothly decreases to the
completion current in the time Ts. Then the purging after welding takes place.
Typical cyclogram of the 4-stroke button mode (TIG АC/4T)
After the button is first pressed and held down, the welding process begins. There
is a pre-welding purge and arc ignition at the start current. The start current will be
maintained until the button is released, after which the start current will smoothly
increase to the set value for the time Tp. After pushing the button again and holding
it, the set current will smoothly decrease to the completion current in the time Ts,
and will remain until the button is released. Then the arc will go out and the post-
welding purge will take place.
The welder chooses the button modes individually depending on the welding
condition.
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