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Manual Metal Arc Weld Deposition

Manual Metal Arc (MMA) welding is a process used for hardfacing where an arc drawn between a coated electrode and workpiece melts the metallic core and electrode coating, transferring molten droplets to the weld pool while the coating provides a gas shield and slag to protect the cooling weld. MMA welding remains widely used for hardfacing due to its low-cost equipment, operating costs, and ease of transport, making it well-suited for repair work.

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55 views1 page

Manual Metal Arc Weld Deposition

Manual Metal Arc (MMA) welding is a process used for hardfacing where an arc drawn between a coated electrode and workpiece melts the metallic core and electrode coating, transferring molten droplets to the weld pool while the coating provides a gas shield and slag to protect the cooling weld. MMA welding remains widely used for hardfacing due to its low-cost equipment, operating costs, and ease of transport, making it well-suited for repair work.

Uploaded by

LymePark
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Hardfacing Alloys

Manual Metal Arc Weld Deposition

Manual Metal Arc (MMA) Weld Deposition


In this process, an arc is drawn between a coated
consumable electrode and the workpiece. The metallic core
is melted by the arc and is transferred to the weld pool as
molten droplets. The electrode coating also melts to form Core Wire
a gas shield around the arc and the weld pool as well as
a slag on the surface of the weld pool, thus protecting the Electrode Holder
cooling weld-pool from the atmosphere. The slag must be
removed after each layer.

MMA welding is still a widely used hardfacing process. Due


to the low cost of the equipment, the low operating costs
of the process, and the ease of transporting the equipment,
this flexible process is ideally suited to repair work.

Coated Electrode

Arc

6 kennametal.com/stellite

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