©
COPYRIGHT 1998 THE ESAB GROUP, INC. LESSON
II
also consumed. The chief advantage
with this method is the elimination of the electrode holder
which must move vertically with the weld pool. Also since the guide tube
is consumed, the
deposition rate is slightly increased with this method. 2.7.4
Equipment
- The equipment used in ESW is all automatic and of special
design. The
power source may use either AC or DC current. The electrode may be either
solid or flux cored,
although if the flux cored is used, it must be specially formulated so as not
to contain its normal
amount of slag forming ingredients. 2.7.5
Summary
- Electrogas Welding is similar to ESW as far as the
mechanical as- pects
are concerned. The equipment is automatic, the welding head travels vertically,
and the molten
puddle is retained by shoes on the sides of the joint. The difference is
that Electrogas Welding
utilizes an arc and it is externally gas shielded. The power source is also
limited to DC
operation. The electrodes used in EGW can be either solid or flux cored.
