Pulse Welding - Weldclass Weldforce 202T Operating Instructions Manual

12.3.3
Pulse welding is where the Arc oscillates between high and low current/amperage.
It should not be confused with AC Current. AC refers to a change in the direction of the current flow whereas
Pulse refers to a change the amount or Amperage of the current.
In Pulse mode the actual welding is done at the Peak of the Pulse. During the Trough of the Pulse the weld
is allowed to cool which reduces the overall heat input into the workpiece.
There are several variables that can be adjusted in Pulse welding which allows for much better control of
various aspects of the weld including:
•
Heat input
•
Penetration
•
Operator Control
•
Finished Weld Appearance
Pulse welding enables the operator to weld faster with better control and reduced heat which in turn
minimises distortion of the work piece and gives a much better looking weld appearance.
The variables are explained further as follows:
Main Amps: this is the main welding current/amperage and which is used to melt the work piece and/or
filler metal.
Base Amps: this is the lower current that allows the weld & work piece to cool. Generally this is set such
that the weld pool is approximately half the size of the main weld pool during Main Current.
Pulse Frequency: this controls how quickly the pulse oscillates (cycles per second) between Main & Base
currents. The setting of this is predominately based on how the operator wants the finished weld bead to
appear.
Pulse Balance: this controls how much time is spent at the Main Current vs the Base Current. Increasing
the Pulse Width percentage increase the time that is spent at the Main Current which in turn increases the
heat input into the job. Inversely reducing the Pulse Width percentage means more time is spent at the
Base Current which reduces heat input.
Figure 49
50

Pulse Welding

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