Everything about Welding and Welding Machine

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Machine Welding.

machine welding

Welding with equipment which performs the welding operation under the observation and control of an operator. The equipment may or may not perform the loading and unloading of the work.

Magnetic Particle Examination or Inspection.

Magnetic Particle Examination or Inspection

This is a nondestructive examination method to locate surface and subsurface discontinuities in ferromagnetic materials. The presence of discontinuities is detected by the use of finely divided ferromagnetic particles applied over the surface. Some of these magnetic particles are gathered and held by the magnetic leakage field created by the discontinuity.
The particles gathered at the surface form an outline of the discontinuity and generally indicate its location, size, shape, and extent.

Malleable Iron.

malleable iron

Cast iron which has been heat-treated in an oven to relieve its brittleness. The process somewhat improves the tensile strength and enables the material to stretch to a limited extent without breaking.

Manual Welding. 

Welding wherein the entire welding operation is performed and controlled by hand.

Mean Velocity of Flow. 

Under steady state of flow, the mean velocity of flow at a given cross section of pipe is equal to the rate of flow Q divided by the area of cross section A. It is expressed in feet per second or meters per second. 

                                                                            v = Q

                                                                                  A

where v _ mean velocity of flow, in feet per second, ft/s (meters per second, m/s) Q _ rate of flow, in cubic feet per second, ft3/s (cubic meters per second, m3/s) A _ area of cross section, in square feet, ft2 (square meters, m2)

Mechanical Joint.

mechanical joint

Ajoint for the purpose of mechanical strength or leak resistance or both, where the mechanical strength is developed by threaded, grooved, rolled, flared, or flanged pipe ends or by bolts, pins, and compounds, gaskets, rolled ends, caulking, or machined and mated surfaces. These joints have particular application where ease of disassembly is desired.

Mill Length. 

Also known as random length. The usual run-of-mill pipe is 16 to 20 ft (5 to 6 m) in length. Line pipe and pipe for power plant use are sometimes made in double lengths of 30 to 35 ft (10 to 12 m).

Miter. 

Two or more straight sections of pipe matched and joined on a line bisecting the angle of junction so as to produce a change in direction.