iWeld 800MLTG2400PFC, Руководство пользователя

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and contamination of the weld or electrode). When the machine detects that the tungsten has
left the surface and a spark is present, it immediately (within microseconds) increases power,
converting the spark to a full arc. It is a simple, safe lower cost alternative arc ignition process to
HF (high frequency) and a superior arc start process to scratch start.
4.2.3 TIG Welding Fusion Technique
Manual TIG welding is often considered the most difficult of all the
welding processes. Because the welder must maintain a short arc
length, great care and skill are required to prevent contact between
the electrode and the workpiece. Similar to Oxygen/Acetylene torch
welding, TIG welding normally requires two hands and in most
instances requires the welder to manually feed a filler wire into the
weld pool with one hand while manipulating the welding torch in the other. However, some
welds combining thin materials can be accomplished without filler metal like edge, corner, and
butt joints. This is known as Fusion welding where the edges of the metal pieces are melted
together using only the heat and arc force.
gas flow
tungsten off
the work
tungsten touches
the work
arc ignition
established
TIG arc
Lay the nozzle on the
job without the tungsten
touching the work. Rock the torch sideways
so that the tungsten
touches the work & hold
momentarily. Rock the torch back in
the opposite direction,
the arc will ignite as
the tungsten lifts off. Lift the torch to
maintain the arc.
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