Praxair MICROTIG 200 HF PULSE Manual De Instrucciones página 18

5.2 -TIG WELDING MODE
TIG (Tungsten Inert Gas) is an arc welding process under protective gas
fitted with a tungsten electrode with 3000ºC fusion point. It can be performed with or without filling metal.
This DC arc process replace with many advantages the oxyacetylene welding process. It is used for steel, stainless steel,
copper, brass welding with the exception to the aluminium and his alloys which needs AC current. Under specific cases, also
replaces the MMA arc welding or Mig welding especially when a good finishing seam is suitable.
A - TIG Contact (Liftig) selection mode (ignition without high frequency) - This TIG process is used where emission of high
frequency waves can disturb the functioning of electronic sensitive
devices such as computers, hospital tools, pace makers, etc. Occasionally, inclusion of tungsten particles will promote
oxidization of welding pieces. Because of this, contact process must be avoided on alimentary equipments production.
With machine connected, push key button 5 until led 4 lights on.
1-open gas
B - TIG HF selection mode (ignition with high frequency) - With machine connected, push key button 5 until led 3 lights on.
1-pre-gas
C - 4T (4 times) mode selection - Push key button 12 until led 2 lights on.
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2-contact 3- arc ignition
2-HF ignition 3-welding
PRAXAIR MICROTIG 200 HF PULSE
Argon or argon mixtures) by means of a Tig torch
(
4-w elding 5-stop
4-post-gas
5-stop
6-close gas