Draper Expert 70052, Instructions Manual

– 8 –

The general rule is to grind the point’s length to match 

the electrodes diameter (Fig.2).

2 

FIG.
However for low amperage/smaller diameter electrodes 

the points length should be double the electrodes 

diameter (Fig.3).

3 

FIG.
Note: During the grinding process thorium alloy 

tungsten can release alpha (

α

) dust particles and in 

some instances beta (

β

) and gamma (

γ

) particles. Avoid 

inhalation as they act as a carcinogen.

4 

FIG.
In addition to dust protection, safety goggles must be 

warn to protect eyes from sparks and debris thrown up 

by the grinder.
Selection of the appropriate specification electrode is 

important to achieve a good quality weld. Seek guidance 

if unsure of selection.
Note: When the output is AC the tip should be rounded.

7.2  TIG (TUNGSTEN INERT GAS)  

SETUP – FIGS. 5 – 6

A suitable gas supply hose, fittings and pressure regulator 

will be required to connect the hose to the TIG torch.

− To attach the TIG torch 

(7)

 to the front panel 

coupling marked ‘

GAS

’ 

(4)

, plug in and twist to lock.

− Attach the earth clamp 

(8)

 into the coupling marked  

‘

’ 

(5)

 – plug in and twist to lock.

− To connect the torch trigger cable 

(7.1)

, fit the 2 pin 

plug into the corresponding connection port marked  

‘

’ 

(2)

.

− Secure the outer ring by screwing it onto the 

threaded outside part of the trigger connection port.

Caution: For shield gas always use Argon/Argon CO2 mix.

Yellow

0.9-1.2%

Thorium Oxide

Long life DC welding tungsten alloy providing 

improved ignition properties and a stable arc. See 

HSE guidelines.

Red

1.8-2.2%

Thorium Oxide

Lilac

2.8-3.2%

Thorium Oxide

Orange

3.8-4.2%

Thorium Oxide

Black

0.9-1.2%

Lanthanum Oxide

Capable of AC/DC welding with similar properties 

to Thorium.  A radioactive free alternative to 

thoriated tungsten.

Gold

1.2-1.8%

Lanthanum Oxide

Blue

1.8-2.2%

Lanthanum Oxide

Pink

0.8-1.2%

Cerium Oxide

Capable of AC/DC welding with reduced slag 

deposits.

Grey

1.8-2.2%

Cerium Oxide

Note: The alloy content shown are a guide but generally range between 1% to 4%.