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03 tig (gtaw) basic welding technique, 05 tig (gtaw) basic welding technique, Tig (gtaw) basic welding technique -14 – Tweco 200DC Inverter Arc Welding Machine User Manual

Page 50: Weldskill 200ac/dc inverter

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WELDSKILL 200AC/DC INVERTER

BASIC WELDING GUIDE

4-14

Manual 0-5207

4.03 TIG (GTAW) Basic Welding Technique

Gas Tungsten Arc Welding (GTAW) or TIG (Tungsten Inert Gas) as it is commonly referred to, is a welding

process in which fusion is produced by an electric arc that is established between a single tungsten (non-

consumable) electrode and the work piece. Shielding is obtained from a welding grade shielding gas or welding

grade shielding gas mixture which is generally Argon based. A filler metal may also be added manually in some

circumstances depending on the welding application.

Welds Made With or Without

Addition of Filler Metal

Work Piece

Can Be Any Commercial

Metal

Gas Cup

Either Ceramic,

High-lmpact or

Water Cooled

Metal

Inert Gas

Shields Electrode

and Weld Puddle

Tungsten Electrode

Non-Consumable

A-09658_AB

Figure 4-28: TIG Welding Application Shot

Tungsten Electrode Current Ranges

Electrode Diameter

DC Current (Amps)

0.040” (1.0mm)

30-60

1/16” (1.6mm)

60-115

3/32” (2.4mm)

100-165

1/8” (3.2mm)

135-200

5/32” (4.0mm)

190-280

3/16” (4.8mm)

250-340

Table 4-3: Current Ranges for Various Tungsten Electrode Sizes

Guide for Selecting Filler Wire Diameter

Filler Wire Diameter DC Current Range (Amps)

1/16” (1.6mm)

20-90

3/32” (2.4mm)

65-115

1/8” (3.2mm)

100-165

3/16” (4.8mm)

200-350

Table 4-4: Filler Wire Selection Guide

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