R-Tech TIG315, Operation Instructions Manual

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Note: When welding with remote foot pedal

 
 Pre-set amperage in LED display will show what the maximum amperage foot pedal will go to 
(what base amperage control knob is set to), upon welding it will show actual welding amperage. 
 
Upon pressing of foot pedal welding arc will start, if you find it hard to start arc push pedal down a 
bit further to aid starting.  
 
The benefits of welding with remote foot pedal is greater control of amount of heat going into work 
especially beneficial on alloys as these absorb the heat much quicker than steel. Press pedal fully 
to start weld, upon weld pool formation you can slightly release the pedal to decrease amperage to 
sustain perfect weld pool and increase again as required to sustain weld characteristics. 
 
The foot pedal adjusts from Start (min) current to Max current set on base current knob on front of 
machine as shown in LED before welding. 
 

When welding with foot pedal ensure the 2/4 way selector switch is in the 2 way position

Tips for AC Welding 

The TIG315 offers two significant advantages over conventional silicon rectifier SCR transformer 
power sources. 
 

1.  The AC square wave balance (SP%) can be set to a higher percentage electrode negative 

(decrease below 50%) which minimizes tungsten heating and erosion 
 

2.  The AC square wave frequency can be varied to focus the arc and achieve quicker travel 

speed 
 
Increasing the AC frequency above 60Hz will narrow the cone shape arc from the 
tungsten’s tip.  
 
Decreasing the AC frequency below 60Hz will broaden the cone shape arc from tungsten’s 
tip. 

  120 Hz 

       60 Hz 

 
The two above benefits above can be used to maintain a tight focus of arc for precise heat control & 
tight joint access. Because of the TIG315 Inverter Technology the following recommendations are 
made as a starting point. 
 
The other benefits are quicker travel speed the higher the AC frequency, thus increasing output 
 
A 2% thoriated tungsten is recommended instead of pure tungsten normally used for AC welding. 
 
Thoriated tungsten’s emit electrons easier and therefore will improve starting.