Submerged Arc Welding (SAW) Flashcards
In SAW, what is the source of the bare wire electrode? What does the bare wire electrode provide?
use is made of a bare wire electrode, which is fed from a spool, providing an electric arc to the joint.
What type of electrode is used in SAW?
In Submerged Arc Welding use is made of a bare wire electrode,
What is the source of the powdered flux? How is it transported to the joint?
Powdered flux is fed from the hopper through the tube to cover the joint and the melting end of the electrode.
What does the arc do to the flux, electrode and joint?
The arc generally causes local melting of the flux, electrode and joint.
What does the slag do?
The slag forms a protective coating and can be easily removed.
What is SAW suitable for? Give examples of this
SAW is suitable for long, uninterrupted weld runs i.e. steel reinforced beams for construction work.
Explain the automated process of submerged arc welding (4)
- A thick layer of powdered flux is deposited on the joint from a hopper.
- An arc is created underneath the flux using a continuously-fed filler wire electrode.
- A slag layer forms on the weld as it cools.
- Unused flux is hoovered up behind.
Name some applications of SAW
Used for long continuous welds i.g. pipes, beams, girders, plates for construction, shipbuilding, bridge building.
Mainly used with steels - carbon steels, alloy steels, stainless steels.
List some pros and cons of SAW
pros: Fast welding, no arc flare (because the arc is submerged under the flux), almost no smoke and fumes (due to submerged arc).
cons: limited straight lines, slag layer needs to be chipped off
Is SAW fully automated?
It is fully automated
What must be labelled on a diagram for SAW welding?
label wire, welding flux, slag, weld metal, molten pool, workpiece, AC or DC current,
