Page 252 - CITS - Welder - Trade Practical

WELDER - CITS

MODULE 7 : GTAW

EXERCISE 61: Set up and monitor GTAW welding

machine & accessories

Objectives

At the end of this exercise you shall be able to
• identify the GTAW welding machine an accessories
• describe the welding technics of GTAW

Job Sequence

• The contact tip should be removed to facilitate easy flow of the wire from the Spiral and put in position into the
Torch later.
• Start the welding machine after the machine is connected to the 3 phase supply mains.
• 15 © NIMI, Not to be republished Connect the welding torch to the positive terminal.
• The positive terminal influences deeper, wider weld penetration with a good ripple formation. Connecting the
heater, regulator and flow meter:
• The inlet end of the inert gas heater is connected to the inert in cylinder.
• The heater should be connected to either 110V supply from the welding machine (or) 230V supply from the
mains.
• This will help to avoid ice forming (freezing) of the inert gas at regulator and flow meter.
• Fix a twostage regulator using a flat spanner to the outlet end of the gas heater and ensure proper functioning
of the dial gauges.

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