Rtech TIG401, Operation Instructions Manual

12

arc from tungsten decreases allowing more control of weld pool and an increase travel 
speed 
 
The pitch noise of weld will increase when AC frequency is turned up, this is normal.  
100 - 120Hz is the ‘sweet spot’ for most AC welding. 
 

6. 

Up slope

Adjustment 0-10 seconds. The main welding current raises from minimum amperage to 
main current selected in time selected when weld started 
 

7. 

Pulse frequency adjustment

This sets how often pulse will occur 0.5 – 25hz 
 

8. 

Pulse width

Pulse width adjustment – This sets length of pulse 0.1 – 0.9 seconds 
 

9. 

Down slope

Down-Slope adjustment 0-10 seconds. The main welding current decreases from main 
amperage to minimum amperage in time selected when weld finished 
 

10. 

Gas post flow adjustment

Gas post flow adjustment 1 – 25 seconds. The gas keeps flowing after weld has finished, 
this cools & stops tungsten from getting contaminated.  
Note: Gas pre-flow time is fixed at 0.5 seconds in TIG mode but no pre-flow time will occur 
if the arc is restarted during post flow time as gas is already flowing. 
 

11. 

MMA – TIG mode switch

MMA-TIG mode switch. Switches between TIG (GTAW) & MMA STICK (SMAW) welding 
 

12. 

AC – DC Selector switch

This switch selects either DC for welding steels or AC for welding alloys 
 
DO NOT SWITCH WHEN WELDING AS DAMAGE TO MACHINE CAN OCCUR. 
 

13. 

2/4 Way selector switch

2/4 Step trigger mode switch – TIG welding can either be done in 2 or 4 step mode. 
 
When the trigger mode is in the 2 step position the following sequence will occur 
 

Press and hold the Tig torch switch to start sequence. 

 
The machine will open gas valve to start flow of shield gas, after a 0.5 seconds pre-flow 
time to purge air from torch hose the welding output of machine will be turned on and the 
arc will be started. After the arc is started the output current will increase from the start 
(min) current to base (main) current in time selected by slope-up. 
 
Release the Tig torch switch to end sequence.