popularity. The objective was to weld more efficiently, compared to the coated
electrode.
Since then a great deal of research and development has been invested in the areas
of arc characteristics, operability and mechanical properties. The result is that
both stick electrodes and solid wire. The key word is productivity, achieved by
the twin advantages of higher deposition rate and increased arc time factor.
gas nozzles and liners. Compared with other processes post-weld dressing, e.g.
spatter removal, can also be minimised.
In short, the use of cored wires reduces total labour costs – the prime objective.
positionality. Today fully positional welding in material thicknesses down to
cooperation with end users.
Elga flux cored wires
The distinguishing feature of flux cored wires is that they form a slag which can
support the weld pool and thereby provide positional welding characteristics.
There are both rutile and basic flux cored wires but the rutile type dominates on
the market due to superior operability.
Elga rutile wires provide very good operability in all positions. The low alloyed
range offers excellent fracture toughness at temperatures down to -60°C, both in
the as-welded and stress relieved condition. Common to the complete Elgacore
programme is a deposited metal hydrogen level below 5ml/100g.
All Elga rutile wires produce high quality root beads on ceramic backing.
Basic flux cored wires are not used to any great extent due to their comparatively
limited welding characteristics and consequent lack of welder friendliness.
Within these limitations however basic wires offer good low temperature fracture
toughness and good crack resistance under conditions of high restraint, e.g. fillet
welds in thick material.
Elga metal cored wires
Metal cored wires contain little or no flux and so produce only a very small
amount of slag, similar to that from a solid wire. The core is composed mainly
of metal powder which in turn contributes to increased productivity. The deposition
efficiency is 96%, against 86% for a rutile flux cored wire, resulting in a
higher deposition rate.
Metal cored wires give very good penetration, similar to solid wire, but with the
added advantage of a wider penetration profile. The combination of these two
factors reduces the risk of lack of fusion and root defects. Today´s wires can be
used for plate thicknesses down to 2-3 mm and, together with the advantages
previously mentioned, has led to them replacing solid wire in many applications.
Metal cored wires permit a significantly higher travel speed, minimal spatter
and less stop/start problems.
This wire type has limited positional operability since it lacks a supporting
slag. In the spray transfer mode the wire is suitable for applications in the flat
and horizontal positions. In the short arc mode it can also be used vertically up,
which is a widely used method for the root bead in single sided welding without
ceramic backing.
Metal cored wires are used extensively in mechanised and robotic applications
but recent years have also seen their increasing use for manual welding, as an
alternative to both solid and rutile flux cored wires.
Elga - For improved profitability
Problem-free production with Elga cored wires
· Exceptionally good wire feeding due to extremely clean surface
· Reliable batch-to-batch consistency
· Weld with a stable, smooth arc
· Negligible spatter = little or no post- weld dressing
· High deposition rates
· Comprehensive range