In GTAW the welding cable is connected to the tungsten electrode through a water-cooled copper contact tube, as shown in picture below. Why is the tube positioned near the lower end of the electrode instead of the top?
In GTAW the welding cable is connected to the tungsten electrode through a water-cooled copper contact tube, as shown in picture below. Why is the tube positioned near the lower end of the electrode instead of the top?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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In GTAW the welding cable is connected to the tungsten electrode through a water-cooled copper contact tube, as shown in picture below. Why is the tube positioned near the lower end of the electrode instead of the top?

Transcribed Image Text:(a)
Welding
direction
Filler rod
(b)
Filler
rod
Metal
droplet
Base metal
Torch
Flow
meter
Cable 2-
Workpiece
Shielding
gas
Shielding
gas
Weld pool
Cable 1
Power
source
Regulator
Shielding gas
cylinder
Tungsten electrode
Contact tube
Cable 1
-Shielding gas
nozzle
-Arc
Weld
metal
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