
Shielded Metal Arc Welding (SMAW) - also known as Manual Metal Arc (MMA) welding or stick welding - is a manual arc welding process that uses a consumable electrode coated in flux to lay the weld. An electrical current is used to form an arc between the electrode and the metals to be joined.
As the weld is laid, the flux coating of the electrode disintegrates, giving off vapours that serve as a shielding gas and providing a layer of slag, both of which protect the weld area from atmospheric contamination.
The Arc Welding Operation
To strike the electric arc, the electrode is brought into contact with the workpiece in a short sweeping motion and then pulled away slightly. This initiates the melting of the workpiece and the consumable electrode, and causes droplets of the electrode to be passed from the electrode to the weld pool. As the electrode melts, the flux covering disintegrates, giving off vapors that protect the weld area from oxygen and other atmospheric gases. In addition, the flux provides molten slag which covers the filler metal as it travels from the electrode to the weld pool.

Once part of the weld pool, the slag floats to the surface and protects the weld from contamination as it solidifies. Once hardened, it must be chipped away to reveal the finished weld. As welding progresses and the electrode melts, the welder must periodically stop welding to remove the remaining electrode stub and insert a new electrode into the electrode holder.
Arc Welding Applications
Shielded metal arc welding is one of world's most popular welding processes, accounting for over half of all welding in some countries. Because of its versatility and simplicity, it is particularly dominant in the maintenance and repair industry, and is heavily used in the construction of steel structures and in industrial fabrication. Because of the low equipment cost and wide applicability, the process is likely to remain popular, especially among amateurs and small businesses where specialized welding processes are uneconomical and unnecessary.
The thickness of the material being welded is bounded on the low end primarily by the skill of the welder, but rarely does it drop below 0.05 in (1.5 mm). No upper bound exists: with proper joint preparation and use of multiple passes, materials of virtually unlimited thicknesses can be joined.
You can find a wide selection of SIP, Sealey and Draper Arc Welders at our web site or give us a ring on 01162 692471 to enquire about any item or spare part. Alternatively, drop us an email at enquiries@aktivetrading.com.











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