5 OPERATION
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Quickly strike the electrode against the metal, then raise it so as to
give an appropriate arc length (approx. 2 mm). If the arc is too long,
it will crackle and spit before finally going out completely.
If you are working on a welding bench, check before attempting to
strike the arc that residual waste metal, pieces of electrode or other
objects on the bench do not insulate the part to be welded.
Once the arc has been struck, move the electrode from left to right.
The electrode must be at an angle of 60° to the metal in relation to
the direction of welding.
When you want to weld wide beads, or when you want the weld to
be so thick that you have to weld in a number of layers, however,
you have to use lateral movements.
5.6 TIG welding
TIG welding melts the metal of the workpiece, using an arc struck from a tungsten electrode,
which does not itself melt. The weld pool and the electrode are protected by shielding gas.
TIG welding is particularly useful where high quality is demanded and for welding thin plate.
Arc 151i / 201i also has good characteristics for TIG welding.
In order to TIG weld Arc 151i / 201i must be equipped with:
• a TIG torch with gas valve
• a welding gas cylinder (a suitable welding gas)
• a welding gas regulator (suitable gas regulator)
• tungsten electrode
• suitable auxiliary material, if necessary.
TIG scrape start (only A31)
To scrape start lightly scrape the tungsten electrode
against the workpiece to create an arc.
”Live TIG-start” (only A33)
With “Live TIG start” the arc strikes when the tungsten electrode is brought into contact with
the workpiece and then lifted away from it.
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