Tweco 300 DC Arcmaster - Manual (Page 40)

ARCMASTER 300 ACDC
6-4 February 22, 2006
6.03 Slope Mode Sequence
Weld Current Down
Slope
Up
Slope
Initial
Current
Switch
Closed Switch
Open Switch
Closed Switch
Open
Preflow
Final
Current
Postflow
Art # A-04989
Figure 6-2: Slope Mode Sequence
1. To start the Slope Sequence, close remote switch
contacts. Once the welding arc is established the
Power Source will maintain the initial current setting
as long as the remote switch contacts are closed.
a. In the HF TIG mode, after Preflow time, High
Frequency is present at the torch. When the torch
is positioned close to the work the welding current
will transfer to the work and establish the arc at
the initial current setting.
b. In the Lift TIG mode, after Preflow time, Lift Start
current is present at the torch. When the electrode
is touched to the work and lifted off, the welding
arc is established at the initial current setting.
6.04 Slope Mode with Repeat Sequence
The repeat function is operated during the down slope
cycle of the Slope Sequence and is active through the
down slope period only. During the down slope period,
by opening the Remote Switch contacts, the current will
increase back to weld current. Within the Down Slope
period the repeat function can be operated as many times
as desired. To continue slope cycle and end slope
sequence close remote switch contacts and allow weld
current to reach final current setting. Once final current
setting is reached, opening the Remote Switch again will
turn off the welding arc and post flow begins.
2. Open Remote Switch – current increases to weld
current. Once welding arc has reached weld current
the power source will maintain weld current as long
as the remote switch contacts are open.
3. Close Remote Switch – Welding current decreases to
final current setting. Once final welding current is
reached the power source will maintain final current
setting as long as the remote switch contacts are
closed.
4. Open Remote Switch – Welding arc stops and post
flow begins.