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Welding Glossary M

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Term Definition
Machinability The ability of a part to be machined or ground to size.
Magnetic field The field created around a wire or electrode whenever electricity travels through that wire or electrode.
Magnetic particle inspection Procedures used to check a weld for flaws, using a liquid that contains particles.The particles are drawn into the flaws when a magnetic field is applied to the weldment.
Malleable castings Cast forms of metal which have been heat-treated to reduce their brittleness.
Mandrel A solid, pointed shaft that is forced through a nearly molten metal rod to form seamless tubing.
Manifold A multiple header for connection of individual gas cylinders or torch supply lines to several work stations.
Manual welding Welding wherein the entire welding operation is performed and controlled by hand.
Mechanical drawings Parts or assembly drawings made by mechanical means, either traditional ãboard drafting or CAD (computer aided drafting).
Mechanical properties A description of a materialâs behavior when force is applied to determine that materialâs suitability for mechanical use.Examples: tensile strength, hardness, modulus of elasticity, elongation and fatigue limit.
Megapascal (MPa) One million Pascals.A Pascal is the metric measure of pressure.
Melting range The temperature range between solidus and liquidus.
Melt through symbol A symbol used on the welding symbol to indicate 100% penetration on a weld made from one side of the base metal.
Metal transfer Movement of metal from one surface to another.
Metal transfer wear Wear that occurs when metal leaves one surface and fuses or sticks to another surface.
Metal-to-metal wear resistance The ability of a material to resist wear from metal-to-metal contact.
Microprocessor An integrated circuit that is programmed to store functions.
MIG (GMAW or Gas Metal Arc Welding) A welding process, also known as short circuit transfer, joins metals by heating them with an arc shielded by externally supplied gas or gas mixture. Metal is deposited when the wire actually touches the workpiece; it is not transferred over the arc. Spray transfer, another type of MIG welding, moves a stream of tiny molten droplets from the arc to the weld puddle.
Motor-driven beam mounted torch A type of automatic cutting machine that uses an electronic tracer to follow the edge of a pattern.The tracer may control one or more cutting torches mounted to the beam.
Motor-driven magnetic tracer A relatively inexpensive automatic cutting machine tat works best with shapes that are not too complex.The magnetic tracer follows a steel pattern.One torch is generally carried on this type of machine.
Multi-pass weld A welding joint requiring many passes.
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