The All Time EGW1 electro-gas welder is used for single pass tank shells vertical welding

Tank shells vertical welding All time EGW

Related Information All Time EGW All Time EGW leaflet

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 .

Advantages

High Deposition Rate – approx. 20 times faster than manual welding, over ten 2.5 m long

vertical seams can be welded in one 8 hrs shift by a single operator!

Welds are done in single pass (up to 40 mm WT), no inter-pass cleaning.

High quality weld with minimum distortion and labor skill requirements.

Both gas shielded, flux cored EGW wire or Self-shielded flux cored EGW wire (eg. Lincoln

NR431 / NR432) are available for different welding conditions.

Equipment

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 Travel Carriage - raises the special welding torch vertically upward Linear Oscillator (for over 25mm plate) – manipulates the welding arc in and out of the joint Retaining Copper Shoes – moulds weld puddles to the joint before it solidifies. Close-loop Weld Current Control - regulates and maintains travel speed of the carriage automatically 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

Technical Data

• Auto-travel speed: 0～250mm/min
• Rapid-travel speed: 550mm/min
• Oscillation stroke: 50mm
• Dwell time : 0～3sec
• Carriage weight: 15Kg
• Wind shielding power travel frame weight: 2000Kg
• Min welding plate thickness: 10mm
• Max welding plate thickness: 40mm (single pass) ; 80mm (double passes)

Tank erection

All Time EGW-I used for tank erection

EGW riding on tank course

Inside the EGW frame

Blast furnace wall welding

Welding 70mm thick wall of steel mill blast furnace with Lincoln Vertishield consumables

Ship panel welding

All Time EGW for Ship Panel Welding (15m long; 15mm wall thickness)