Arc Machines 307 - Manual (Page 147)

Arc Machines, Inc. Model 307 Orbital Tube Welder Training
Document No. 740096 Chapter 14. Page 3.
Rev. A
Prepping Equipment
Equipment is available for cutting, for
facing, or for a combination of cutting
and facing. Orbital type saws in which
the saw blade moves around a station-
ary tube are commonly used. Orbital
type saws can produce weld ends
square enough for some orbital weld-
ing applications, but if the blades are
not kept sharp, the edges may
become rough and burrs may occur.
Burrs produced by cutting and facing
must be removed before welding.
Tube cutters may be used for cutting
small diameter tubing, but this procedure compresses the tubing ends and
the ends must be faced back to the uncompressed part. An I.D. purge is
often used to prevent particles generated during cutting and facing opera-
tions from entering the interior of the tubing. Gloves must be worn when
handling unwrapped tubing and components in high-purity applications.
Orbital type saw is used to cut tubing while
producing a square end. Photo courtesy of
George Fiscsher GmbH.
End preparation equipment for facing
heavier wall thicknesses
Insert rings may be used as filler material
for fusion welding of some materials. Rings
must be tacked in place prior to orbital
welding.