Tank shells vertical welding

All time EGW

Process
The EGW (Electro Gas Welding) process is a high deposition welding process that uses retaining shoes toconfine a molten metal for vertical progression welding. With this particular setup, the welding arc travels at the vertical weld axis and deposits weld metal as if the welding is done in the flat position.

EGW is considered as a highly automatic process as it requires closed loop current sensing or other means, to govern travel speed & to maintain electrode stickout automatically without operator interference.

This process is widely used by Japanese & Korean fabricators for storage tanks & ship panel vertical welding .

1. Self Propelling Wind Shielding Frame - rides the top of the tank shell and travels laterally along the tank diameters. Provides the "indoor" condition desired for high quality site welding
2. Travel Carriage - raises the special welding torch vertically upward
3. Linear Oscillator (for over 25mm plate) – manipulates the welding arc in and out of the joint
4. Retaining Copper Shoes – moulds weld puddles to the joint before it solidifies.
5. Close-loop Weld Current Control - regulates and maintains travel speed of the carriage automatically
6. DC welding power supply and wire feeder – provides welding output for the operation

All Time EGW1 comes standard with a modified Lincoln USA LF72 wire feeder and DC600 CC/CV power supply. For self shielded (gasless) wire welding (e.g. Lincoln Vertishield Process), Lincoln USA LN9 wire feeder and DC1000 power supply are recommended.

Lincoln LF 72 Wire Feeder	Lincoln DC600

Wind shielding operation frame with power lateral travel

Welding carriages with close loop sensing control to maintain stick out